Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/bdwgc/libatomic_ops/.gitattributes

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+# Git repo attributes.
+
+# need LF enforced to make cygwin work
+*.sh text eol=lf
+*.ac text eol=lf
+*.am text eol=lf
+*.m4 text eol=lf
+
+# Ensure all text files have normalized (LF) line endings in the repository.
+* text=auto
+
+# Note: "core.eol" configuration variable controls which line endings to use
+# for the normalized files in the working directory (the default is native).

external/bdwgc/libatomic_ops/.gitignore

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+# Ignored files in libatomic_ops Git repo.
+
+Makefile
+
+/pkgconfig/atomic_ops.pc
+/pkgconfig/atomic_ops-uninstalled.pc
+/autom4te.cache/
+/config.cache
+/config.log
+/config.status
+/libatomic_ops-*
+
+*.a
+*.dll
+*.exe
+*.gcda
+*.gch
+*.gcno
+*.la
+*.lib
+*.lo
+*.o
+*.obj
+*.so
+
+/src/.deps/
+/src/.libs/
+/src/config.h
+/src/config.h.in~
+/src/stamp-h1
+
+/tests/.deps/
+/tests/core
+/tests/list_atomic.i
+/tests/test_atomic
+/tests/test_atomic_pthreads
+/tests/test_malloc
+/tests/test_stack
+
+# External library (without trailing slash to allow symlinks):
+/pthreads-w32*
+
+# These files are generated by autoreconf:
+/aclocal.m4
+/compile
+/config.guess
+/config.sub
+/configure
+/depcomp
+/install-sh
+/missing
+/mkinstalldirs
+/src/config.h.in
+/test-driver
+Makefile.in
+
+# Generated by libtoolize:
+/libtool
+/ltmain.sh
+/m4/*.m4
+
+# These files are generated by make check:
+/tests/list_atomic.c
+/tests/test_atomic_include.h
+/tests/test*.log
+/tests/test*.trs

external/bdwgc/libatomic_ops/AUTHORS

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+Originally written by Hans Boehm, with some platform-dependent code
+imported from the Boehm-Demers-Weiser GC, where it was contributed
+by many others.
+Currently maintained by Ivan Maidanski.
+
+Andreas Tobler <a.tobler@schweiz.org>
+Andrew Agno <agno+boehmgc@agno.net>
+Bradley Smith <brad@brad-smith.co.uk>
+Bruce Mitchener <bruce.mitchener@gmail.com>
+Carlos O'Donell <carlos@baldric.uwo.ca>
+Daniel Grayson <dan@math.uiuc.edu>
+Doug Lea <dl@cs.oswego.edu>
+Earl Chew <earl_chew@agilent.com>
+Emmanuel Stapf <manus@eiffel.com>
+Gilles Talis <gilles.talis@gmail.com>
+Gregory Farnum <gregory.farnum@dreamhost.com>
+H.J. Lu <hjl.tools@gmail.com>
+Hans Boehm <boehm@acm.org>
+Hans-Peter Nilsson <hp@gcc.gnu.org>
+Ian Wienand <ianw@gelato.unsw.edu.au>
+Ivan Maidanski <ivmai@mail.ru>
+Jeremy Huddleston <jeremyhu@apple.com>
+Jim Marshall <jim.marshall@wbemsolutions.com>
+Joerg Wagner <wagner@it.neclab.eu>
+Linas Vepstas <linasvepstas@gmail.com>
+Luca Barbato <lu_zero@gentoo.org>
+Maged Michael <michael@cs.rochester.edu>
+Manuel Serrano <Manuel.Serrano@inria.fr>
+Michael Hope <michael.hope@linaro.org>
+Patrick Marlier <patrick.marlier@unine.ch>
+Petter Urkedal <urkedal@nbi.dk>
+Philipp Zambelli <pzamb@iicm.edu>
+Ranko Zivojnovic <ranko@spidernet.net>
+Roger Hoover <roger.hoover@gmail.com>
+Sebastian Siewior <sebastian@breakpoint.cc>
+Takashi Yoshii <takashi.yoshii.zj@renesas.com>
+Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>
+Thorsten Glaser <tg@debian.org>
+Tony Mantler <nicoya@ubb.ca>
+Yvan Roux <yvan.roux@linaro.org>

external/bdwgc/libatomic_ops/COPYING

@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
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external/bdwgc/libatomic_ops/ChangeLog

@@ -0,0 +1,324 @@
+
+== [7.4.2] 2014-05-02 ==
+
+* Fix a typo in doc/README.txt (remove redundant "an" article).
+* Update emails/links due to project site transition.
+
+
+== [7.4.0] 2013-11-17 ==
+
+* Add and/or/xor entries to list_atomic (tests).
+* Add char/short/int/AO_double_t and dd_acquire cases to list_atomic (tests).
+* Add compile-time assertion for size of 'standard' AO_double_t.
+* Add double_store pthread-based implementation and tests.
+* Add generalized CAS primitives of char/short/int size.
+* Add generalized atomic and/or/xor operations for char/short/int types.
+* Add generalized fetch_and_add_acquire/release (for ARMv6+).
+* Add generic implementation of double_load primitives.
+* Add information about AO_ASSUME_VISTA to README_win32.
+* Add internal header containing only char/short/int/AO_t atomic loads.
+* Add load/store primitives generalization based on CAS.
+* Add lock-based implementation of char/short/int_fetch_compare_and_swap.
+* Add makefile rule to test list_atomic.template syntax (tests).
+* Add missing 'const' in aligned-atomic XSIZE_load implementation.
+* Add missing double_compare_and_swap to generalization.
+* Add missing generalization of no-barrier CAS in template.
+* Add negative double-CAS test cases to test_atomic_include (tests).
+* Add test_stack to Makefile.msft (tests).
+* Adjust fprintf arguments type matching specifier in test_stack (tests).
+* Adjust included filenames in atomic_ops_malloc and test_stack.
+* Adjust quotes in echo command of Makefile.msft (Win32).
+* Always use 'mfence' for nop_full if target CPU supports SSE2 (gcc/x86).
+* Better document configure THREADDLLIBS variable.
+* Cast away volatile on dereference in CAS-based generalization primitives.
+* Change policy regarding version numbers ("micro" part instead of "alpha").
+* Convert README to Markdown format.
+* Define AO_NO_PTHREADS in configure if no pthreads (Win32 and VxWorks).
+* Define AO_int_X operations for ARM and avr32.
+* Define double-wide ordered loads/stores for x86.
+* Define int_and/or/xor primitives in ao_t_is_int header.
+* Define nop_full as compiler barrier for pre-ARMv6 single-core case.
+* Do not duplicate BUILT_SOURCES entries in nobase_private_HEADERS (Makefile).
+* Do not include standard_ao_double_t.h where double-CAS is unimplemented.
+* Do not report absence of meaningless nop, load and store in test_atomic.
+* Do not use deprecated AO_T and AO_TS_T (tests).
+* Eliminate 'missing initializer' warning for AO_stack_t value initializer.
+* Eliminate 64-bit compiler warnings in atomic_ops_malloc.
+* Eliminate arithmetic shifts in double-CAS (gcc/arm, msftc/x86).
+* Eliminate warning for fetch_and_add argument in test_atomic_include (tests).
+* Enable Makefile.msft for Win64.
+* Enable build using toolchain without pthreads.
+* Enable double_compare_and_swap for non-cpp code (msftc/x86.h).
+* Enable generalization of all variants of CAS via fetch_compare_and_swap.
+* Enable test_stack for pthreads-w32 and Win32 with native threads.
+* Fix generalized AO_char/short_compare_and_swap args (missing 'unsigned').
+* Fix makefile sed rule for list_atomic (tests).
+* Fix missing abort() usage in atomic_ops_malloc and tests on WinCE.
+* Generalize compare_double_and_swap_double using double_compare_and_swap.
+* Generalize double_load/store for x86_64 (GCC).
+* Generate ao_t_is_int, 'loadstore' headers from templates.
+* Generate generalized AO_t load/store/fetch_and_add primitives from template.
+* Generate ordered_loads/stores_only headers from templates.
+* Group all X_acquire_release_volatile.h and X_[aligned_]atomic_load_store.h.
+* Implement and/or/xor, AO_double_load for ARM.
+* Implement atomic store using direct write by default on ARMv6+.
+* Implement char/short/int-wide primitives using GCC built-in atomic/sync.
+* Implement char/short/int_fetch_and_add for msftc/x86[_64] (Win32).
+* Implement char/short_fetch_and_add, char/short_load for ARMv6+ (GCC).
+* Implement char/short_store primitives at aligned addresses for ARM.
+* Implement compare_double_and_swap_double for SunCC/x86.
+* Implement double_load/store based on guaranteed x86 access atomicity.
+* Implement double_store for ARMv7 using LDREXD/STREXD.
+* Implement load/store via simple LDR/STR for ARMv6+ (msftc).
+* Implement nop_full/write using 'dmb' instruction if available (gcc/arm).
+* Improve debug printing in test_stack (tests).
+* Log messages to stdout instead of stderr (tests).
+* Make AO_ASSUME_VISTA also enables Win98 code in msftc/x86.h (Win32).
+* Minimize gcc/generic-arithm template by factoring out barriers.
+* Move 'unsigned' keyword to XCTYPE in generalize-small template.
+* Move default compiler options to CFLAGS in Makefile.msft (Win32).
+* Move definitions of ordered loads/stores to inner separate headers.
+* Move gcc-generic AO_t-wide primitives to generic-small/arithm headers.
+* Move generalized arithmetical primitives to 'generalize-arithm' template.
+* Optimize AO_spin manually to minimize compiler influence on its duration.
+* Parameterize list_atomic template with XSIZE (tests).
+* Perform only few list reversals in test_malloc if AO based on pthreads.
+* Put autogen.sh to 'dist' package (Automake).
+* Remote duplicate definition of test_and_set_acquire in generalize.h.
+* Remove X_aligned_atomic_load_store headers and template.
+* Remove duplicate AO_spin and AO_pause definition in atomic_ops_stack.
+* Remove gcc/x86_64.h eliminating code duplication of gcc/x86.h.
+* Remove nested AO_USE_PTHREAD_DEFS macro check in atomic_ops.h (gcc/arm).
+* Remove redundant 'cc' clobber for LDREXD instruction (gcc/arm).
+* Remove store_full from msftc/arm.h in favor of generalized primitive.
+* Remove sunc/x86_64.h eliminating code duplication of sunc/x86.h.
+* Remove unsafe emulation-based implementation of double CAS (SunCC/x86_64).
+* Remove useless 'perror' call in run_parallel.h (tests).
+* Reorder AO_double_t union elements for AO_DOUBLE_T_INITIALIZER portability.
+* Replace atomic_load_store.template with atomic_load and atomic_store ones.
+* Replace some FIXME items with TODO in atomic_ops.c and sysdeps headers.
+* Specify fetch_and_add/sub1 result as unused in test_atomic (tests).
+* Support AArch64 (64-bit ARM) target (GCC).
+* Support ARMv8 target (gcc/arm).
+* Test double_compare_and_swap in test_atomic (tests).
+* Use AO_ prefix for internal functions in arm_v6.h, hppa.h.
+* Use __atomic GCC built-in to implement generic double-wide CAS.
+* Use built-in __sync CAS for double-CAS if AO_USE_SYNC_CAS_BUILTIN for x86.
+* Workaround GCC 4.4.3 warning reported for 'val' of list_atomic.c (tests).
+
+
+== [7.3alpha2] 2012-05-11 ==
+
+* Add '-no-undefined' to LDFLAGS in src/Makefile.am.
+* Add AO_and, AO_xor atomic operations.
+* Add AO_fetch_compare_and_swap primitives.
+* Add and fill in AUTHORS, TODO files.
+* Add autogen.sh file.
+* Adjust AO_..._H macros in public headers.
+* Code refactoring of gcc/arm.h by introducing AO_ARM_HAVE_x macros.
+* Define AO macros for libatomic_ops version identification.
+* Do not define NDEBUG if '--enable-assertions' passed to configure.
+* Eliminate compiler warnings in various functions and macros.
+* Generalize AO_compare_and_swap primitives via AO_fetch_compare_and_swap.
+* Generalize acquire/release/full CAS primitives for MIPS
+* Implement fetch_and_add, test_and_set primitives for MIPS.
+* Improve Makefile for MS VC++; pass '-W3' option to MS compiler.
+* Include ao_t_is_int.h from atomic_ops.h after first generalization pass
+* Merge all Makefile.am files in src tree.
+* Minor code refactoring of atomic_ops.c, generic_pthread.h.
+* Minor configure build improvements (e.g., ensure proper autoconf version).
+* Place only major per-release changes description to ChangeLog (this file).
+* Recognize AO_PREFER_GENERALIZED macro to favor generalization over assembly.
+* Remove all auto-generated files except for generalize-small.h from the repo.
+* Remove duplicate doc/COPYING and empty NEWS files.
+* Replace atomic_ops_malloc static mmap-related empty functions with macros.
+* Replace pointer relational comparisons with non-pointer ones.
+* Require autoconf 2.61 instead of v2.64.
+* Show extra compiler warnings (GCC only).
+* Turn off AO primitives inlining if AO_NO_INLINE defined.
+* Use __builtin_expect in CAS failure loop condition checks (GCC only).
+
+
+== [7.2f] 2014-05-02 ==
+
+* Fix a typo in doc/README.txt (remove redundant "an" article).
+* Regenerate configure files by new automake (v1.14.1), libtool (v2.4.2.418).
+
+
+== [7.2e] 2013-11-10 ==
+
+* Fix (remove) invalid include of read_ordered.h for ARM.
+* Fix AM_CONFIG_HEADER in configure for autoconf-2.69-1.
+* Fix AO_pause sleep delay for particular argument values (Win32).
+* Fix ARMv7 LDREXD/STREXD double-wide operand specification (GCC/Clang).
+* Fix LDREXD/STREXD use for pre-Clang3.3/arm.
+* Fix README regarding _acquire_read barrier.
+* Fix XSIZE_load/store definition order in generalize-small template.
+* Fix asm constraint of CAS memory operand for gcc/alpha, clang-3.1/mips.
+* Fix asm constraints of primitives in sunc/x86.h.
+* Fix cmpxchg16b-based compare_double_and_swap_double for SunCC/x86_64.
+* Fix compare_double_and_swap_double and double_ptr_storage for gcc/x32.
+* Fix compare_double_and_swap_double for clang3.0/x86 in PIC mode.
+* Fix compare_double_and_swap_double_full definition condition in emul_cas.
+* Fix generalize-small template adding missed CAS-based fetch_and_add.
+* Fix generalized fetch_and_add function.
+* Fix missing compiler barrier in nop_full for uniprocessor ARM.
+* Fix ordered_except_wr header inclusion for s390.
+* Fix return type of AO_int_X primitives defined in ao_t_is_int header.
+* Fix return type of char/short/int_load_read() in read_ordered.h.
+* Fix template-based headers regeneration order in src/Makefile.
+* Fix typos in ao_t_is_int, atomic_ops.h, generalize.h, msftc/arm.h comments.
+* Fix variable type to match printf format specifier in test_stack.
+* Fix visibility and initial value of 'dummy' variable in atomic_ops_stack.
+* Terminate tests with abort after error reported.
+
+
+== [7.2d] 2012-08-09 ==
+
+* Fix AO_compare_double_and_swap_double_full for gcc-4.2.1/x86 in PIC mode.
+* Fix AO_compiler_barrier missing parentheses.
+* Fix missing 'unsigned' for generalized AO_char/short_fetch_and_add result.
+
+
+== [7.2] 2012-05-11 ==
+
+* Add atomic_ops.pc.in and atomic_ops-uninstalled.pc.in to pkgconfig folder.
+* Define and use AO_PTRDIFF_T in tests for casts between pointer and integer.
+* Fix AO_compare_and_swap return type for s390 and PowerPC.
+* Fix AO_compare_double_and_swap_double_full for gcc/x86 (PIC mode).
+* Fix AO_stack_push_release to workaround bug in clang-1.1/x86 compiler.
+* Fix AO_test_and_setXX in tests/list_atomic.template.
+* Fix AO_test_and_set_full (gcc/x86[_64].h) to work-around a bug in LLVM v2.7.
+* Fix AO_test_and_set_full on m68k.
+* Fix __ARM_ARCH_5__ macro handling for Android NDK (ARMv7).
+* Fix configure for Cygwin, mingw-w64/32.
+* Fix configure to define __PIC__ macro explicitly if needed (GCC).
+* Fix double_ptr_storage definition for GCC pre-v4 (x86_64).
+* Fix for x32 by removing 'q' suffix in x86-64 instructions.
+* Fix generalization for IA-64 (regarding AO_or, AO_..._read/write primitives)
+* Fix generalized AO_<type>_fetch_and_add() return type.
+* Fix test_atomic_include for the case of missing CAS primitive.
+* Fix test_malloc - allocate less memory in case of missing mmap.
+* Implement the basic atomic primitives for the hexagon CPU.
+
+
+== [7.2alpha6] 2011-06-14 ==
+
+* Add missing AO_HAVE_ macros.
+* Add support of avr32 CPU.
+* Better support of various models of ARM.
+* Disable AO_compare_double_and_swap_double_full for SunCC x86 as not working.
+* Enable ARM Thumb-2 mode.
+* Fix AO_test_and_set_full for SunCC (x86).
+* Fix bugs in tests.
+* Fix clobbers in AO_compare_and_swap_full (x86.h).
+* Fix typos in identifiers and comments.
+* Improve AO_sync for PowerPC.
+* Improve make scripts (configure.ac).
+* Make get_mmaped() in atomic_ops_malloc.c more portable.
+* Support Intel compiler.
+* Support NaCl target.
+* Suppress compiler warnings in various places.
+* Test more predefined macros (ARM, PowerPC).
+* Use assembly code only for MS VC if available (x86_64).
+* Use built-in __sync_bool_compare_and_swap if available (x86_64).
+* Workaround bugs in LLVM GCC and SunCC regarding XCHG (x86, x86_64).
+
+
+== [7.2alpha4] 2009-12-02 ==
+
+* Fix typos in comments, identifiers and documentation.
+* Implement AO_compare_and_swap_full for SPARC.
+* Refine ARM-specific code.
+* Refine code and comments for MS VC.
+* Regenerate make scripts.
+* Share common code for all 32-bit CPUs (MS VC).
+* Support DigitalMars and Watcom compilers.
+* Support MS VC for ARM (WinCE).
+* Support SH CPU.
+* Support win32-pthreads.
+* Support x86 and x86_64 for SunCC compiler.
+
+
+== [7.2alpha2] 2009-05-27 ==
+
+* Add MIPS support.
+* Add better support for m68k.
+* Add "const" to first parameter of load calls.
+* Add parentheses around address argument for various macros.
+* Add some platform-specific documentation to INSTALL.
+* Add untested 64-bit support for PowerPC.
+* Fix AO_compare_and_swap_double_acquire.
+* Fix AO_int_fetch_and_add_full (x86_64).
+* Fix comments.
+* Fix s390 include paths.
+* Fix use of lwz instruction (PowerPC).
+* Refine clobbers (PowerPC).
+* Remove outdated info about Windows support in README.
+* Replace K&R-style function definition with ANSI C one.
+* add AO_compare_double_and_swap_double for ARMv6.
+* gcc/powerpc.h: Consider __NO_LWSYNC__.
+
+
+== [7.1] 2008-02-11 ==
+
+* Add test_and_set, AO_double_compare_and_swap generalizations.
+* Conditionally add compare_double_and_swap_double (x86).
+* Conditionally add compare_double_and_swap_double (x86).
+* Fix AO_compare_double_and_swap_double_full (x86) for PIC mode.
+* Fix AO_load_acquire for PowerPC.
+* Fix double-width CAS (x86).
+* Refine README (add more warnings about data dependencies).
+* Refine double_ptr_storage type definition.
+* Support ARMv6+ in GCC.
+* Support ArmCC compiler.
+* Use _InterlockedExchangeAdd for MS VC (x86).
+
+
+== [7.0] 2007-06-28 ==
+
+* Add 64-bit version of AO_load_acquire for PowerPC.
+* Add support of x86 and x86_64 for MS VC.
+* Do not assume that "mfence" is always present (x86.h).
+* Fix ARM AO_test_and_set_full.
+* Include windows.h (MS VC).
+* Update README to reflect C++0x effort.
+
+
+== [1.2] 2006-07-11 ==
+
+* Add prototypes to suppress compiler warnings.
+* Add simple VxWorks support.
+* Fix InterlockedCompareExchange proto usage.
+* Fix typos (ia64).
+* Include all_acquire_release_volatile.h and all_atomic_load_store.h (ia64).
+* Initial support for 64-bit targets.
+* Use "=q" for AO_test_and_set_full (x86).
+* Use inline assembler to generate "mfence" and byte sized XCHG.
+* Use new intrinsics available in MSVC 2003 and MSVC 2005.
+
+
+== [1.1] 2005-09-27 ==
+
+* Add and use read_ordered.h.
+* Change function naming from "byte" to "char".
+* Fix AO_test_and_set for ARM; define AO_CAN_EMUL_CAS.
+
+
+== [1.0] 2005-03-21 ==
+
+* Fix various bugs.
+* Add atomic_ops primitives for different sized data.
+* Add compare_double_and_swap_double and compare_and_swap_double.
+* Add initial support for atomic_ops for VC++/Windows/X86 and HP/UX.
+* Add minimal support for the Sun SPARC compiler.
+* Add support for platforms that require out-of-line assembly code.
+* Add support of int-wide operations on platforms with int-sized pointers.
+* Added libatomic_ops_gpl library with support for lock-free stack and malloc.
+* Attempt to support PowerPC.
+* Change atomic_ops include file structure.
+* Change most platforms to use byte-wide test-and-set locations.
+* Install under "atomic_ops" instead of "ao".
+* Remove compiler_barrier workaround for gcc 3.4+.
+* Renamed various types to end in _t.
+* Use autoconf, automake.

external/bdwgc/libatomic_ops/Makefile.am

@@ -0,0 +1,13 @@
+SUBDIRS = src doc
+
+ACLOCAL_AMFLAGS = -I m4
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pkgconfig/atomic_ops.pc
+noinst_DATA = pkgconfig/atomic_ops-uninstalled.pc
+
+dist_pkgdata_DATA = COPYING README.md
+
+EXTRA_DIST = autogen.sh
+
+#distclean-local:

external/bdwgc/libatomic_ops/README.md

@@ -0,0 +1,63 @@
+# The atomic_ops library (libatomic_ops)
+
+This is version 7.4.2 of libatomic_ops.
+
+You might find a more recent version
+[here](http://www.hboehm.info/gc/), or
+[here](https://github.com/ivmai/libatomic_ops).
+
+
+## Overview
+
+This package provides semi-portable access to hardware-provided
+atomic memory update operations on a number architectures.  These might
+allow you to write code:
+
+* That does more interesting things in signal handlers.
+
+* Makes more effective use of multiprocessors by allowing you to write
+  clever lock-free code.  Note that such code is very difficult to get
+  right, and will unavoidably be less portable than lock-based code.  It
+  is also not always faster than lock-based code.  But it may occasionally
+  be a large performance win.
+
+* To experiment with new and much better thread programming paradigms, etc.
+
+For details and licensing restrictions see the files in the "doc"
+subdirectory.
+
+Please address bug reports to [mailing list](mailto:bdwgc@lists.opendylan.org).
+
+
+## Installation and Usage
+
+The configuration and build scripts for this package were generated by
+Automake/Autoconf.  "./configure; make; sudo make install" in this
+directory should work.  For a more customized build, see the output of
+"./configure --help".
+
+Note that much of the content of this library is in the header files.
+However, two small libraries are built and installed:
+
+* libatomic_ops.a is a support library, which is not needed on some platforms.
+  This is intended to be usable, under some mild restrictions, in free or
+  proprietary code, as are all the header files.  See doc/LICENSING.txt.
+
+* libatomic_ops_gpl.a contains some higher level facilities.  This code is
+  currently covered by the GPL.  The contents currently correspond to
+  the headers atomic_ops_stack.h and atomic_ops_malloc.h.
+
+
+## Platform Specific Notes
+
+Win32/64: src/Makefile.msft contains a very simple Makefile for building
+and running tests and building the gpl library.  The core atomic_ops
+implementation is entirely in header files.
+
+HP-UX/PA-RISC: aCC -Ae won't work as a C compiler, since it doesn't support
+inline assembly code.  Use cc.
+
+
+## Copyright & Warranty
+
+See doc/LICENSING.txt file.

external/bdwgc/libatomic_ops/TODO

@@ -0,0 +1,13 @@
+== TODO tasks ==
+
+Add C++0x ATM (atomic memory operations) layer.
+
+
+== FIXME tasks ==
+
+RHELinux6/POWER7 (gcc-4.4.7-3/ppc64), Fedora16/POWER7 (gcc-4.6.2-1/ppc64),
+Debian/powerpc (gcc 4.6.3-7):
+test_stack failed (Debian Bug #680100).
+
+Debian/m68k (Linux 3.2.0-2-atari):
+test_stack failed (Bus error), regression (Debian Bug #680066).

external/bdwgc/libatomic_ops/autogen.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+# This script creates (or regenerates) configure (as well as aclocal.m4,
+# config.h.in, Makefile.in, etc.) missing in the source repository.
+
+autoreconf -i
+
+echo
+echo "Ready to run './configure'."

external/bdwgc/libatomic_ops/configure.ac

@@ -0,0 +1,190 @@
+# Process this file with autoconf to produce a configure script.
+AC_INIT([libatomic_ops],[7.4.2],bdwgc@lists.opendylan.org)
+
+AC_PREREQ(2.61)
+AC_CANONICAL_TARGET([])
+AC_CONFIG_SRCDIR(src/atomic_ops.c)
+AC_CONFIG_MACRO_DIR([m4])
+AM_INIT_AUTOMAKE([foreign dist-bzip2 nostdinc])
+AM_MAINTAINER_MODE
+
+AC_CONFIG_HEADERS([src/config.h])
+
+# Checks for programs.
+AM_PROG_CC_C_O
+AM_PROG_AS
+LT_INIT([disable-shared])
+
+# Checks for functions.
+AC_FUNC_MMAP
+
+# Determine PIC flag.
+need_asm=false
+PICFLAG=
+AC_MSG_CHECKING(for PIC compiler flag)
+if test "$GCC" = yes; then
+  case "$host" in
+    *-*-cygwin* | *-*-mingw*)
+      # Cygwin and Mingw[-w32/64] do not need -fPIC.
+      AC_MSG_RESULT("<none>")
+      ;;
+    *)
+      AC_MSG_RESULT(-fPIC)
+      PICFLAG=-fPIC
+      AC_MSG_CHECKING(whether gcc -fPIC causes __PIC__ definition)
+      # Workaround: at least GCC 3.4.6 (Solaris) does not define this macro.
+      old_CFLAGS="$CFLAGS"
+      CFLAGS="$PICFLAG $CFLAGS"
+      AC_TRY_COMPILE([],[
+ #ifndef __PIC__
+ # error
+ #endif
+      ], [ac_cv_pic_macro=yes], [ac_cv_pic_macro=no])
+      CFLAGS="$old_CFLAGS"
+      AC_MSG_RESULT($ac_cv_pic_macro)
+      AS_IF([test "$ac_cv_pic_macro" = yes], [],
+            [PICFLAG="-D__PIC__=1 $PICFLAG"])
+      ;;
+  esac
+
+  # Output all warnings.
+  AC_MSG_CHECKING(for gcc -Wextra)
+  old_CFLAGS="$CFLAGS"
+  CFLAGS="-Wextra $CFLAGS"
+  AC_TRY_COMPILE([],[], [ac_cv_cc_wextra=yes], [ac_cv_cc_wextra=no])
+  CFLAGS="$old_CFLAGS"
+  AC_MSG_RESULT($ac_cv_cc_wextra)
+  AS_IF([test "$ac_cv_cc_wextra" = yes], [WEXTRA="-Wextra"], [WEXTRA="-W"])
+  CFLAGS="-Wall $WEXTRA $CFLAGS"
+else
+  case "$host" in
+    *-*-hpux*)
+      AC_MSG_RESULT("+Z")
+      PICFLAG="+Z"
+      CFLAGS="+O2 -mt $CFLAGS"
+      ;;
+    *-*-solaris*)
+      AC_MSG_RESULT(-Kpic)
+      PICFLAG=-Kpic
+      CFLAGS="-O $CFLAGS"
+      need_asm=true
+      ;;
+    *-*-linux*)
+      AC_MSG_RESULT(-fPIC)
+      PICFLAG=-fPIC
+      # Any Linux compiler had better be gcc compatible.
+      ;;
+    *)
+      AC_MSG_RESULT("<none>")
+      ;;
+  esac
+fi
+
+AC_ARG_ENABLE(assertions,
+        [AC_HELP_STRING([--enable-assertions], [Assertion checking])])
+if test "$enable_assertions" != yes; then
+  AC_DEFINE([NDEBUG], 1, [Define to disable assertion checking.])
+fi
+
+AC_SUBST(PICFLAG)
+AC_SUBST(DEFS)
+
+AH_TEMPLATE([_PTHREADS], [Indicates the use of pthreads (NetBSD).])
+
+AH_TEMPLATE([AO_USE_NANOSLEEP],
+        [Use nanosleep() instead of select() (only if atomic operations \
+         are emulated)])
+AH_TEMPLATE([AO_USE_NO_SIGNALS],
+        [Do not block signals in compare_and_swap (only if atomic operations \
+         are emulated)])
+AH_TEMPLATE([AO_USE_WIN32_PTHREADS],
+        [Use Win32 Sleep() instead of select() (only if atomic operations \
+         are emulated)])
+AH_TEMPLATE([AO_TRACE_MALLOC], [Trace AO_malloc/free calls (for debug only)])
+
+# These macros are tested in public headers
+AH_TEMPLATE([AO_GENERALIZE_ASM_BOOL_CAS],
+        [Force compare_and_swap definition via fetch_compare_and_swap])
+AH_TEMPLATE([AO_PREFER_GENERALIZED],
+        [Prefer generalized definitions to direct assembly-based ones])
+AH_TEMPLATE([AO_USE_PTHREAD_DEFS],
+        [Emulate atomic operations via slow and async-signal-unsafe \
+         pthread locking])
+AH_TEMPLATE([AO_ASM_X64_AVAILABLE],
+        [Inline assembly avalable (only VC/x86_64)])
+AH_TEMPLATE([AO_ASSUME_VISTA],
+        [Assume Windows Server 2003, Vista or later target (only VC/x86)])
+AH_TEMPLATE([AO_ASSUME_WINDOWS98],
+        [Assume hardware compare-and-swap functionality available \
+         on target (only VC/x86)])
+AH_TEMPLATE([AO_CMPXCHG16B_AVAILABLE],
+        [Assume target is not old AMD Opteron chip (only x86_64)])
+AH_TEMPLATE([AO_FORCE_USE_SWP],
+        [Force test_and_set to use SWP instruction instead of LDREX/STREX \
+         (only arm v6+)])
+AH_TEMPLATE([AO_NO_SPARC_V9], [Assume target is not sparc v9+ (only sparc)])
+AH_TEMPLATE([AO_OLD_STYLE_INTERLOCKED_COMPARE_EXCHANGE],
+        [Assume ancient MS VS Win32 headers (only VC/arm v6+, VC/x86)])
+AH_TEMPLATE([AO_UNIPROCESSOR], [Assume single-core target (only arm v6+)])
+AH_TEMPLATE([AO_USE_INTERLOCKED_INTRINSICS],
+        [Assume Win32 _Interlocked primitives available as intrinsics \
+         (only VC/arm)])
+AH_TEMPLATE([AO_USE_PENTIUM4_INSTRS],
+        [Use Pentium 4 'mfence' instruction (only x86)])
+AH_TEMPLATE([AO_USE_SYNC_CAS_BUILTIN],
+        [Prefer GCC built-in CAS intrinsics in favor of inline assembly \
+         (only gcc/x86, gcc/x86_64)])
+AH_TEMPLATE([AO_WEAK_DOUBLE_CAS_EMULATION],
+        [Emulate double-width CAS via pthread locking in case of no hardware \
+         support (only gcc/x86_64, the emulation is unsafe)])
+
+AC_DEFINE(_REENTRANT, 1, [Required define if using POSIX threads.])
+
+# Libraries needed to support threads (if any).
+have_pthreads=false
+AC_CHECK_LIB(pthread, pthread_self, have_pthreads=true)
+if test x$have_pthreads = xtrue; then
+  THREADDLLIBS=-lpthread
+  case "$host" in
+    *-*-netbsd*)
+      # Indicates the use of pthreads.
+      AC_DEFINE(_PTHREADS)
+      ;;
+    *-*-openbsd* | *-*-kfreebsd*-gnu | *-*-dgux*)
+      THREADDLLIBS=-pthread
+      ;;
+    *-*-cygwin* | *-*-darwin*)
+      # Cygwin does not have a real libpthread, so Libtool cannot link
+      # against it.
+      THREADDLLIBS=
+      ;;
+    *-*-mingw*)
+      # Use Win32 threads for tests anyway.
+      THREADDLLIBS=
+      # Skip test_atomic_pthreads.
+      have_pthreads=false
+      ;;
+  esac
+else
+  AC_DEFINE([AO_NO_PTHREADS], 1, [No pthreads library available])
+  # Assume VxWorks or Win32.
+  THREADDLLIBS=
+fi
+AC_SUBST(THREADDLLIBS)
+
+AM_CONDITIONAL(HAVE_PTHREAD_H, test x$have_pthreads = xtrue)
+AM_CONDITIONAL(NEED_ASM, test x$need_asm = xtrue)
+
+AC_CONFIG_FILES([
+        Makefile
+        doc/Makefile
+        src/Makefile
+        pkgconfig/atomic_ops.pc
+        pkgconfig/atomic_ops-uninstalled.pc ])
+
+AC_CONFIG_COMMANDS([default],[[]],[[
+PICFLAG="${PICFLAG}"
+CC="${CC}"
+DEFS="${DEFS}"
+]])
+AC_OUTPUT

external/bdwgc/libatomic_ops/doc/LICENSING.txt

@@ -0,0 +1,63 @@
+Our intent is to make it easy to use libatomic_ops, in
+both free and proprietary software.  Hence most code that we expect to be
+linked into a client application is covered by an MIT-style license.
+
+A few library routines are covered by the GNU General Public License.
+These are put into a separate library, libatomic_ops_gpl.a .
+
+The low-level part of the library is mostly covered by the following
+license:
+
+----------------------------------------
+
+Copyright (c) ...
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+--------------------------------
+
+A few files in the sysdeps directory were inherited in part from the
+Boehm-Demers-Weiser conservative garbage collector, and are covered by
+its license, which is similar in spirit:
+
+--------------------------------
+
+Copyright (c) ...
+
+THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+
+Permission is hereby granted to use or copy this program
+for any purpose,  provided the above notices are retained on all copies.
+Permission to modify the code and to distribute modified code is granted,
+provided the above notices are retained, and a notice that the code was
+modified is included with the above copyright notice.
+
+----------------------------------
+
+A few files are covered by the GNU General Public License.  (See file
+"COPYING".) This applies only to test code, sample applications,
+and the libatomic_ops_gpl portion of the library.
+Thus libatomic_ops_gpl should generally not be linked into proprietary code.
+(This distinction was motivated by patent considerations.)
+
+It is possible that the license of the GPL pieces may be changed for
+future versions to make them more consistent with the rest of the package.
+If you submit patches, and have strong preferences about licensing, please
+express them.

external/bdwgc/libatomic_ops/doc/Makefile.am

@@ -0,0 +1,4 @@
+# installed documentation
+#
+dist_pkgdata_DATA=LICENSING.txt README.txt README_stack.txt \
+    README_malloc.txt README_win32.txt

external/bdwgc/libatomic_ops/doc/README.txt

@@ -0,0 +1,246 @@
+Usage:
+
+0) If possible, do this on a multiprocessor, especially if you are planning
+on modifying or enhancing the package.  It will work on a uniprocessor,
+but the tests are much more likely to pass in the presence of serious problems.
+
+1) Type ./configure --prefix=<install dir>; make; make check
+in the directory containing unpacked source.  The usual GNU build machinery
+is used, except that only static, but position-independent, libraries
+are normally built.  On Windows, read README_win32.txt instead.
+
+2) Applications should include atomic_ops.h.  Nearly all operations
+are implemented by header files included from it.  It is sometimes
+necessary, and always recommended to also link against libatomic_ops.a.
+To use the almost non-blocking stack or malloc implementations,
+see the corresponding README files, and also link against libatomic_gpl.a
+before linking against libatomic_ops.a.
+
+OVERVIEW:
+Atomic_ops.h defines a large collection of operations, each one of which is
+a combination of an (optional) atomic memory operation, and a memory barrier.
+Also defines associated feature-test macros to determine whether a particular
+operation is available on the current target hardware (either directly or
+by synthesis).  This is an attempt to replace various existing files with
+similar goals, since they usually do not handle differences in memory
+barrier styles with sufficient generality.
+
+If this is included after defining AO_REQUIRE_CAS, then the package
+will make an attempt to emulate compare-and-swap in a way that (at least
+on Linux) should still be async-signal-safe.  As a result, most other
+atomic operations will then be defined using the compare-and-swap
+emulation.  This emulation is slow, since it needs to disable signals.
+And it needs to block in case of contention.  If you care about performance
+on a platform that can't directly provide compare-and-swap, there are
+probably better alternatives.  But this allows easy ports to some such
+platforms (e.g. PA_RISC).  The option is ignored if compare-and-swap
+can be implemented directly.
+
+If atomic_ops.h is included after defining AO_USE_PTHREAD_DEFS, then all
+atomic operations will be emulated with pthread locking.  This is NOT
+async-signal-safe.  And it is slow.  It is intended primarily for debugging
+of the atomic_ops package itself.
+
+Note that the implementation reflects our understanding of real processor
+behavior.  This occasionally diverges from the documented behavior.  (E.g.
+the documented X86 behavior seems to be weak enough that it is impractical
+to use.  Current real implementations appear to be much better behaved.)
+We of course are in no position to guarantee that future processors
+(even HPs) will continue to behave this way, though we hope they will.
+
+This is a work in progress.  Corrections/additions for other platforms are
+greatly appreciated.  It passes rudimentary tests on X86, Itanium, and
+Alpha.
+
+OPERATIONS:
+
+Most operations operate on values of type AO_t, which are unsigned integers
+whose size matches that of pointers on the given architecture.  Exceptions
+are:
+
+- AO_test_and_set operates on AO_TS_t, which is whatever size the hardware
+supports with good performance.  In some cases this is the length of a cache
+line.  In some cases it is a byte.  In many cases it is equivalent to AO_t.
+
+- A few operations are implemented on smaller or larger size integers.
+Such operations are indicated by the appropriate prefix:
+
+AO_char_... Operates on unsigned char values.
+AO_short_... Operates on unsigned short values.
+AO_int_... Operates on unsigned int values.
+
+(Currently a very limited selection of these is implemented.  We're
+working on it.)
+
+The defined operations are all of the form AO_[<size>_]<op><barrier>(<args>).
+
+The <op> component specifies an atomic memory operation.  It may be
+one of the following, where the corresponding argument and result types
+are also specified:
+
+void nop()
+        No atomic operation.  The barrier may still be useful.
+AO_t load(const volatile AO_t * addr)
+        Atomic load of *addr.
+void store(volatile AO_t * addr, AO_t new_val)
+        Atomically store new_val to *addr.
+AO_t fetch_and_add(volatile AO_t *addr, AO_t incr)
+        Atomically add incr to *addr, and return the original value of *addr.
+AO_t fetch_and_add1(volatile AO_t *addr)
+        Equivalent to AO_fetch_and_add(addr, 1).
+AO_t fetch_and_sub1(volatile AO_t *addr)
+        Equivalent to AO_fetch_and_add(addr, (AO_t)(-1)).
+void and(volatile AO_t *addr, AO_t value)
+        Atomically 'and' value into *addr.
+void or(volatile AO_t *addr, AO_t value)
+        Atomically 'or' value into *addr.
+void xor(volatile AO_t *addr, AO_t value)
+        Atomically 'xor' value into *addr.
+int compare_and_swap(volatile AO_t * addr, AO_t old_val, AO_t new_val)
+        Atomically compare *addr to old_val, and replace *addr by new_val
+        if the first comparison succeeds.  Returns nonzero if the comparison
+        succeeded and *addr was updated.
+AO_t fetch_compare_and_swap(volatile AO_t * addr, AO_t old_val, AO_t new_val)
+        Atomically compare *addr to old_val, and replace *addr by new_val
+        if the first comparison succeeds; returns the original value of *addr.
+AO_TS_VAL_t test_and_set(volatile AO_TS_t * addr)
+        Atomically read the binary value at *addr, and set it.  AO_TS_VAL_t
+        is an enumeration type which includes two values AO_TS_SET and
+        AO_TS_CLEAR.  An AO_TS_t location is capable of holding an
+        AO_TS_VAL_t, but may be much larger, as dictated by hardware
+        constraints.  Test_and_set logically sets the value to AO_TS_SET.
+        It may be reset to AO_TS_CLEAR with the AO_CLEAR(AO_TS_t *) macro.
+        AO_TS_t locations should be initialized to AO_TS_INITIALIZER.
+        The values of AO_TS_SET and AO_TS_CLEAR are hardware dependent.
+        (On PA-RISC, AO_TS_SET is zero!)
+
+Test_and_set is a more limited version of compare_and_swap.  Its only
+advantage is that it is more easily implementable on some hardware.  It
+should thus be used if only binary test-and-set functionality is needed.
+
+If available, we also provide compare_and_swap operations that operate
+on wider values.  Since standard data types for double width values
+may not be available, these explicitly take pairs of arguments for the
+new and/or old value.  Unfortunately, there are two common variants,
+neither of which can easily and efficiently emulate the other.
+The first performs a comparison against the entire value being replaced,
+where the second replaces a double-width replacement, but performs
+a single-width comparison:
+
+int compare_double_and_swap_double(volatile AO_double_t * addr,
+                                   AO_t old_val1, AO_t old_val2,
+                                   AO_t new_val1, AO_t new_val2);
+
+int compare_and_swap_double(volatile AO_double_t * addr,
+                            AO_t old_val1,
+                            AO_t new_val1, AO_t new_val2);
+
+where AO_double_t is a structure containing AO_val1 and AO_val2 fields,
+both of type AO_t.  For compare_and_swap_double, we compare against
+the val1 field.  AO_double_t exists only if AO_HAVE_double_t
+is defined.
+
+ORDERING CONSTRAINTS:
+
+Each operation name also includes a suffix that specifies the associated
+ordering semantics.  The ordering constraint limits reordering of this
+operation with respect to other atomic operations and ordinary memory
+references.  The current implementation assumes that all memory references
+are to ordinary cacheable memory; the ordering guarantee is with respect
+to other threads or processes, not I/O devices.  (Whether or not this
+distinction is important is platform-dependent.)
+
+Ordering suffixes are one of the following:
+
+<none>: No memory barrier.  A plain AO_nop() really does nothing.
+_release: Earlier operations must become visible to other threads
+          before the atomic operation.
+_acquire: Later operations must become visible after this operation.
+_read: Subsequent reads must become visible after reads included in
+       the atomic operation or preceding it.  Rarely useful for clients?
+_write: Earlier writes become visible before writes during or after
+        the atomic operation.  Rarely useful for clients?
+_full: Ordered with respect to both earlier and later memory ops.
+       AO_store_full or AO_nop_full are the normal ways to force a store
+       to be ordered with respect to a later load.
+_release_write: Ordered with respect to earlier writes.  This is
+                normally implemented as either a _write or _release
+                barrier.
+_acquire_read: Ordered with respect to later reads. This is
+                normally implemented as either a _read or _acquire barrier.
+_dd_acquire_read: Ordered with respect to later reads that are data
+               dependent on this one.  This is needed on
+               a pointer read, which is later dereferenced to read a
+               second value, with the expectation that the second
+               read is ordered after the first one.  On most architectures,
+               this is equivalent to no barrier.  (This is very
+               hard to define precisely.  It should probably be avoided.
+               A major problem is that optimizers tend to try to
+               eliminate dependencies from the generated code, since
+               dependencies force the hardware to execute the code
+               serially.)
+
+We assume that if a store is data-dependent on a previous load, then
+the two are always implicitly ordered.
+
+It is possible to test whether AO_<op><barrier> is available on the
+current platform by checking whether AO_HAVE_<op>_<barrier> is defined
+as a macro.
+
+Note that we generally don't implement operations that are either
+meaningless (e.g. AO_nop_acquire, AO_nop_release) or which appear to
+have no clear use (e.g. AO_load_release, AO_store_acquire, AO_load_write,
+AO_store_read).  On some platforms (e.g. PA-RISC) many operations
+will remain undefined unless AO_REQUIRE_CAS is defined before including
+the package.
+
+When typed in the package build directory, the following command
+will print operations that are unimplemented on the platform:
+
+make test_atomic; ./test_atomic
+
+The following command generates a file "list_atomic.i" containing the
+macro expansions of all implemented operations on the platform:
+
+make list_atomic.i
+
+Future directions:
+
+It currently appears that something roughly analogous to this is very likely
+to become part of the C++0x standard.  That effort has pointed out a number
+of issues that we expect to address there.  Since some of the solutions
+really require compiler support, they may not be completely addressed here.
+
+Known issues include:
+
+We should be more precise in defining the semantics of the ordering
+constraints, and if and how we can guarantee sequential consistency.
+
+Dd_acquire_read is very hard or impossible to define in a way that cannot
+be invalidated by reasonably standard compiler transformations.
+
+There is probably no good reason to provide operations on standard
+integer types, since those may have the wrong alignment constraints.
+
+
+Example:
+
+If you want to initialize an object, and then "publish" a pointer to it
+in a global location p, such that other threads reading the new value of
+p are guaranteed to see an initialized object, it suffices to use
+AO_release_write(p, ...) to write the pointer to the object, and to
+retrieve it in other threads with AO_acquire_read(p).
+
+Platform notes:
+
+All X86: We quietly assume 486 or better.
+
+Microsoft compilers:
+Define AO_ASSUME_WINDOWS98 to get access to hardware compare-and-swap
+functionality.  This relies on the InterlockedCompareExchange() function
+which was apparently not supported in Windows95.  (There may be a better
+way to get access to this.)
+
+Gcc on x86:
+Define AO_USE_PENTIUM4_INSTRS to use the Pentium 4 mfence instruction.
+Currently this is appears to be of marginal benefit.

external/bdwgc/libatomic_ops/doc/README_malloc.txt

@@ -0,0 +1,57 @@
+The libatomic_ops_gpl includes a simple almost-lock-free malloc implementation.
+
+This is intended as a safe way to allocate memory from a signal handler,
+or to allocate memory in the context of a library that does not know what
+thread library it will be used with.  In either case locking is impossible.
+
+Note that the operations are only guaranteed to be 1-lock-free, i.e. a
+single blocked thread will not prevent progress, but multiple blocked
+threads may.  To safely use these operations in a signal handler,
+the handler should be non-reentrant, i.e. it should not be interruptable
+by another handler using these operations.  Furthermore use outside
+of signal handlers in a multithreaded application should be protected
+by a lock, so that at most one invocation may be interrupted by a signal.
+The header will define the macro "AO_MALLOC_IS_LOCK_FREE" on platforms
+on which malloc is completely lock-free, and hence these restrictions
+do not apply.
+
+In the presence of threads, but absence of contention, the time performance
+of this package should be as good, or slightly better than, most system
+malloc implementations.  Its space performance
+is theoretically optimal (to within a constant factor), but probably
+quite poor in practice.  In particular, no attempt is made to
+coalesce free small memory blocks.  Something like Doug Lea's malloc is
+likely to use significantly less memory for complex applications.
+
+Performance on platforms without an efficient compare-and-swap implementation
+will be poor.
+
+This package was not designed for processor-scalability in the face of
+high allocation rates.  If all threads happen to allocate different-sized
+objects, you might get lucky.  Otherwise expect contention and false-sharing
+problems.  If this is an issue, something like Maged Michael's algorithm
+(PLDI 2004) would be technically a far better choice.  If you are concerned
+only with scalability, and not signal-safety, you might also consider
+using Hoard instead.  We have seen a factor of 3 to 4 slowdown from the
+standard glibc malloc implementation with contention, even when the
+performance without contention was faster.  (To make the implementation
+more scalable, one would need to replicate at least the free list headers,
+so that concurrent access is possible without cache conflicts.)
+
+Unfortunately there is no portable async-signal-safe way to obtain large
+chunks of memory from the OS.  Based on reading of the source code,
+mmap-based allocation appears safe under Linux, and probably BSD variants.
+It is probably unsafe for operating systems built on Mach, such as
+Apple's Darwin.  Without use of mmap, the allocator is
+limited to a fixed size, statically preallocated heap (2MB by default),
+and will fail to allocate objects above a certain size (just under 64K
+by default).  Use of mmap to circumvent these limitations requires an
+explicit call.
+
+The entire interface to the AO_malloc package currently consists of:
+
+#include <atomic_ops_malloc.h> /* includes atomic_ops.h */
+
+void *AO_malloc(size_t sz);
+void AO_free(void *p);
+void AO_malloc_enable_mmap(void);

external/bdwgc/libatomic_ops/doc/README_stack.txt

@@ -0,0 +1,77 @@
+Note that the AO_stack implementation is licensed under the GPL,
+unlike the lower level routines.
+
+The header file atomic_ops_stack.h defines a linked stack abstraction.
+Stacks may be accessed by multiple concurrent threads.  The implementation
+is 1-lock-free, i.e. it will continue to make progress if at most one
+thread becomes inactive while operating on the data structure.
+
+(The implementation can be built to be N-lock-free for any given N.  But that
+seems to rarely be useful, especially since larger N involve some slowdown.)
+
+This makes it safe to access these data structures from non-reentrant
+signal handlers, provided at most one non-signal-handler thread is
+accessing the data structure at once.  This latter condition can be
+ensured by acquiring an ordinary lock around the non-handler accesses
+to the data structure.
+
+For details see:
+
+Hans-J. Boehm, "An Almost Non-Blocking Stack", PODC 2004,
+http://portal.acm.org/citation.cfm?doid=1011767.1011774
+(This is not exactly the implementation described there, since the
+interface was cleaned up in the interim.  But it should perform
+very similarly.)
+
+We use a fully lock-free implementation when the underlying hardware
+makes that less expensive, i.e. when we have a double-wide compare-and-swap
+operation available.  (The fully lock-free implementation uses an AO_t-
+sized version count, and assumes it does not wrap during the time any
+given operation is active.  This seems reasonably safe on 32-bit hardware,
+and very safe on 64-bit hardware.) If a fully lock-free implementation
+is used, the macro AO_STACK_IS_LOCK_FREE will be defined.
+
+The implementation is interesting only because it allows reuse of
+existing nodes.  This is necessary, for example, to implement a memory
+allocator.
+
+Since we want to leave the precise stack node type up to the client,
+we insist only that each stack node contains a link field of type AO_t.
+When a new node is pushed on the stack, the push operation expects to be
+passed the pointer to this link field, which will then be overwritten by
+this link field.  Similarly, the pop operation returns a pointer to the
+link field of the object that previously was on the top of the stack.
+
+The cleanest way to use these routines is probably to define the stack node
+type with an initial AO_t link field, so that the conversion between the
+link-field pointer and the stack element pointer is just a compile-time
+cast.  But other possibilities exist.  (This would be cleaner in C++ with
+templates.)
+
+A stack is represented by an AO_stack_t structure.  (This is normally
+2 or 3 times the size of a pointer.)  It may be statically initialized
+by setting it to AO_STACK_INITIALIZER, or dynamically initialized to
+an empty stack with AO_stack_init.  There are only three operations for
+accessing stacks:
+
+void AO_stack_init(AO_stack_t *list);
+void AO_stack_push_release(AO_stack_t *list, AO_t *new_element);
+AO_t * AO_stack_pop_acquire(volatile AO_stack_t *list);
+
+We require that the objects pushed as list elements remain addressable
+as long as any push or pop operation are in progress.  (It is OK for an object
+to be "pop"ped off a stack and "deallocated" with a concurrent "pop" on
+the same stack still in progress, but only if "deallocation" leaves the
+object addressable.  The second "pop" may still read the object, but
+the value it reads will not matter.)
+
+We require that the headers (AO_stack objects) remain allocated and
+valid as long as any operations on them are still in-flight.
+
+We also provide macros AO_REAL_HEAD_PTR that converts an AO_stack_t
+to a pointer to the link field in the next element, and AO_REAL_NEXT_PTR
+that converts a link field to a real, dereferencable, pointer to the link field
+in the next element.  This is intended only for debugging, or to traverse
+the list after modification has ceased.  There is otherwise no guarantee that
+walking a stack using this macro will produce any kind of consistent
+picture of the data structure.

external/bdwgc/libatomic_ops/doc/README_win32.txt

@@ -0,0 +1,31 @@
+Most of the atomic_ops functionality is available under Win32 with
+the Microsoft tools, but the build process currently is considerably more
+primitive than on Linux/Unix platforms.
+
+To build:
+
+1) Go to the src directory in the distribution.
+2) Make sure the Microsoft command-line tools (e.g. nmake) are available.
+3) Run "nmake -f Makefile.msft".  This should run some tests, which
+may print warnings about the types of the "Interlocked" functions.
+I haven't been able to make all versions of VC++ happy.  If you know
+how to, please send a patch.
+4) To compile applications, you will need to retain or copy the following
+pieces from the resulting src directory contents:
+        "atomic_ops.h" - Header file defining low-level primitives.  This
+                         includes files from:
+        "atomic_ops"- Subdirectory containing implementation header files.
+        "atomic_ops_stack.h" - Header file describing almost lock-free stack.
+        "atomic_ops_malloc.h" - Header file describing almost lock-free malloc.
+        "libatomic_ops_gpl.lib" - Library containing implementation of the
+                        above two (plus AO_pause() defined in atomic_ops.c).
+                        The atomic_ops.h implementation is entirely in the
+                        header files in Win32.
+
+Most clients of atomic_ops.h will need to define AO_ASSUME_WINDOWS98 before
+including it.  Compare_and_swap is otherwise not available.
+Defining AO_ASSUME_VISTA will make compare_double_and_swap_double available
+as well.
+
+Note that the library is covered by the GNU General Public License, while
+the top 2 of these pieces allow use in proprietary code.

external/bdwgc/libatomic_ops/m4/.gitignore

@@ -0,0 +1,3 @@
+# Place holder to keep this directory in the Git repository.
+*
+!.gitignore

external/bdwgc/libatomic_ops/pkgconfig/atomic_ops-uninstalled.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+top_builddir=@abs_top_builddir@
+top_srcdir=@abs_top_srcdir@
+
+Name: The atomic_ops library (uninstalled)
+Description: Atomic memory update operations
+Version: @PACKAGE_VERSION@
+Libs: ${top_builddir}/src/libatomic_ops.la
+Cflags: -I${top_builddir}/src -I${top_srcdir}/src

external/bdwgc/libatomic_ops/pkgconfig/atomic_ops.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: The atomic_ops library
+Description: Atomic memory update operations portable implementation
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -latomic_ops
+Cflags: -I${includedir}

external/bdwgc/libatomic_ops/src/Makefile.am

@@ -0,0 +1,229 @@
+AM_CFLAGS=@PICFLAG@
+AM_CPPFLAGS = -I$(top_builddir)/src -I$(top_srcdir)/src
+
+include_HEADERS = atomic_ops.h atomic_ops_stack.h atomic_ops_malloc.h
+lib_LTLIBRARIES = libatomic_ops.la libatomic_ops_gpl.la
+if NEED_ASM
+libatomic_ops_la_SOURCES = atomic_ops.c atomic_ops_sysdeps.S
+else
+libatomic_ops_la_SOURCES = atomic_ops.c
+endif
+libatomic_ops_la_LDFLAGS = -version-info 1:3:0 -no-undefined
+
+libatomic_ops_gpl_la_SOURCES = atomic_ops_stack.c atomic_ops_malloc.c
+libatomic_ops_gpl_la_LDFLAGS = -version-info 1:3:0 -no-undefined
+
+EXTRA_DIST = Makefile.msft atomic_ops/sysdeps/README \
+        atomic_ops/generalize-arithm.template \
+        atomic_ops/generalize-small.template \
+        atomic_ops/sysdeps/ao_t_is_int.template \
+        atomic_ops/sysdeps/gcc/generic-arithm.template \
+        atomic_ops/sysdeps/gcc/generic-small.template \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.template \
+        atomic_ops/sysdeps/loadstore/atomic_load.template \
+        atomic_ops/sysdeps/loadstore/atomic_store.template \
+        atomic_ops/sysdeps/loadstore/ordered_loads_only.template \
+        atomic_ops/sysdeps/loadstore/ordered_stores_only.template \
+        atomic_ops/sysdeps/sunc/sparc.S
+
+BUILT_SOURCES = atomic_ops/generalize-arithm.h \
+        atomic_ops/generalize-small.h \
+        atomic_ops/sysdeps/ao_t_is_int.h \
+        atomic_ops/sysdeps/gcc/generic-arithm.h \
+        atomic_ops/sysdeps/gcc/generic-small.h \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.h \
+        atomic_ops/sysdeps/loadstore/atomic_load.h \
+        atomic_ops/sysdeps/loadstore/atomic_store.h \
+        atomic_ops/sysdeps/loadstore/char_acquire_release_volatile.h \
+        atomic_ops/sysdeps/loadstore/char_atomic_load.h \
+        atomic_ops/sysdeps/loadstore/char_atomic_store.h \
+        atomic_ops/sysdeps/loadstore/int_acquire_release_volatile.h \
+        atomic_ops/sysdeps/loadstore/int_atomic_load.h \
+        atomic_ops/sysdeps/loadstore/int_atomic_store.h \
+        atomic_ops/sysdeps/loadstore/ordered_loads_only.h \
+        atomic_ops/sysdeps/loadstore/ordered_stores_only.h \
+        atomic_ops/sysdeps/loadstore/short_acquire_release_volatile.h \
+        atomic_ops/sysdeps/loadstore/short_atomic_load.h \
+        atomic_ops/sysdeps/loadstore/short_atomic_store.h
+
+#Private Headers
+privatedir=${includedir}/
+nobase_private_HEADERS = atomic_ops/ao_version.h \
+          atomic_ops/generalize.h \
+          $(BUILT_SOURCES) \
+        \
+          atomic_ops/sysdeps/all_acquire_release_volatile.h \
+          atomic_ops/sysdeps/all_aligned_atomic_load_store.h \
+          atomic_ops/sysdeps/all_atomic_load_store.h \
+          atomic_ops/sysdeps/all_atomic_only_load.h \
+          atomic_ops/sysdeps/emul_cas.h \
+          atomic_ops/sysdeps/generic_pthread.h \
+          atomic_ops/sysdeps/ordered.h \
+          atomic_ops/sysdeps/ordered_except_wr.h \
+          atomic_ops/sysdeps/read_ordered.h \
+          atomic_ops/sysdeps/standard_ao_double_t.h \
+          atomic_ops/sysdeps/test_and_set_t_is_ao_t.h \
+          atomic_ops/sysdeps/test_and_set_t_is_char.h \
+        \
+          atomic_ops/sysdeps/armcc/arm_v6.h \
+        \
+          atomic_ops/sysdeps/gcc/aarch64.h \
+          atomic_ops/sysdeps/gcc/alpha.h \
+          atomic_ops/sysdeps/gcc/arm.h \
+          atomic_ops/sysdeps/gcc/avr32.h \
+          atomic_ops/sysdeps/gcc/cris.h \
+          atomic_ops/sysdeps/gcc/generic.h \
+          atomic_ops/sysdeps/gcc/hexagon.h \
+          atomic_ops/sysdeps/gcc/hppa.h \
+          atomic_ops/sysdeps/gcc/ia64.h \
+          atomic_ops/sysdeps/gcc/m68k.h \
+          atomic_ops/sysdeps/gcc/mips.h \
+          atomic_ops/sysdeps/gcc/powerpc.h \
+          atomic_ops/sysdeps/gcc/s390.h \
+          atomic_ops/sysdeps/gcc/sh.h \
+          atomic_ops/sysdeps/gcc/sparc.h \
+          atomic_ops/sysdeps/gcc/x86.h \
+        \
+          atomic_ops/sysdeps/hpc/hppa.h \
+          atomic_ops/sysdeps/hpc/ia64.h \
+        \
+          atomic_ops/sysdeps/ibmc/powerpc.h \
+        \
+          atomic_ops/sysdeps/icc/ia64.h \
+        \
+          atomic_ops/sysdeps/loadstore/double_atomic_load_store.h \
+        \
+          atomic_ops/sysdeps/msftc/arm.h \
+          atomic_ops/sysdeps/msftc/common32_defs.h \
+          atomic_ops/sysdeps/msftc/x86.h \
+          atomic_ops/sysdeps/msftc/x86_64.h \
+        \
+          atomic_ops/sysdeps/sunc/sparc.h \
+          atomic_ops/sysdeps/sunc/x86.h
+
+atomic_ops/generalize-small.h: atomic_ops/generalize-small.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XSIZE:double:g -e s:XCTYPE:AO_double_t:g $? >> $@
+
+atomic_ops/generalize-arithm.h: atomic_ops/generalize-arithm.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+
+atomic_ops/sysdeps/ao_t_is_int.h: atomic_ops/sysdeps/ao_t_is_int.template
+	sed -e s:_XBAR::g $? > $@
+	sed -e s:XBAR:full:g $? >> $@
+	sed -e s:XBAR:acquire:g $? >> $@
+	sed -e s:XBAR:release:g $? >> $@
+	sed -e s:XBAR:write:g $? >> $@
+	sed -e s:XBAR:read:g $? >> $@
+
+atomic_ops/sysdeps/gcc/generic-arithm.h: \
+        atomic_ops/sysdeps/gcc/generic-arithm.template
+	sed -e s:_XBAR::g -e s:XGCCBAR:RELAXED:g \
+		-e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:_XBAR::g -e s:XGCCBAR:RELAXED:g \
+		-e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:_XBAR::g -e s:XGCCBAR:RELAXED:g \
+		-e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:_XBAR::g -e s:XGCCBAR:RELAXED:g \
+		-e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XBAR:acquire:g -e s:XGCCBAR:ACQUIRE:g \
+		-e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? >> $@
+	sed -e s:XBAR:acquire:g -e s:XGCCBAR:ACQUIRE:g \
+		-e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XBAR:acquire:g -e s:XGCCBAR:ACQUIRE:g \
+		-e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XBAR:acquire:g -e s:XGCCBAR:ACQUIRE:g \
+		-e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XBAR:release:g -e s:XGCCBAR:RELEASE:g \
+		-e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? >> $@
+	sed -e s:XBAR:release:g -e s:XGCCBAR:RELEASE:g \
+		-e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XBAR:release:g -e s:XGCCBAR:RELEASE:g \
+		-e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XBAR:release:g -e s:XGCCBAR:RELEASE:g \
+		-e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XBAR:full:g -e s:XGCCBAR:SEQ_CST:g \
+		-e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? >> $@
+	sed -e s:XBAR:full:g -e s:XGCCBAR:SEQ_CST:g \
+		-e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XBAR:full:g -e s:XGCCBAR:SEQ_CST:g \
+		-e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XBAR:full:g -e s:XGCCBAR:SEQ_CST:g \
+		-e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+
+atomic_ops/sysdeps/gcc/generic-small.h: \
+        atomic_ops/sysdeps/gcc/generic-small.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+
+atomic_ops/sysdeps/loadstore/ordered_loads_only.h: \
+        atomic_ops/sysdeps/loadstore/ordered_loads_only.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XSIZE:double:g -e s:XCTYPE:AO_double_t:g $? >> $@
+
+atomic_ops/sysdeps/loadstore/ordered_stores_only.h: \
+        atomic_ops/sysdeps/loadstore/ordered_stores_only.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? >> $@
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? >> $@
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? >> $@
+	sed -e s:XSIZE:double:g -e s:XCTYPE:AO_double_t:g $? >> $@
+
+atomic_ops/sysdeps/loadstore/acquire_release_volatile.h: \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.template
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? > $@
+
+atomic_ops/sysdeps/loadstore/char_acquire_release_volatile.h: \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+
+atomic_ops/sysdeps/loadstore/int_acquire_release_volatile.h: \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.template
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? > $@
+
+atomic_ops/sysdeps/loadstore/short_acquire_release_volatile.h: \
+        atomic_ops/sysdeps/loadstore/acquire_release_volatile.template
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? > $@
+
+atomic_ops/sysdeps/loadstore/atomic_load.h: \
+        atomic_ops/sysdeps/loadstore/atomic_load.template
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? > $@
+
+atomic_ops/sysdeps/loadstore/char_atomic_load.h: \
+        atomic_ops/sysdeps/loadstore/atomic_load.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+
+atomic_ops/sysdeps/loadstore/int_atomic_load.h: \
+        atomic_ops/sysdeps/loadstore/atomic_load.template
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? > $@
+
+atomic_ops/sysdeps/loadstore/short_atomic_load.h: \
+        atomic_ops/sysdeps/loadstore/atomic_load.template
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? > $@
+
+atomic_ops/sysdeps/loadstore/atomic_store.h: \
+        atomic_ops/sysdeps/loadstore/atomic_store.template
+	sed -e s:XSIZE_::g -e s:XCTYPE:AO_t:g $? > $@
+
+atomic_ops/sysdeps/loadstore/char_atomic_store.h: \
+        atomic_ops/sysdeps/loadstore/atomic_store.template
+	sed -e s:XSIZE:char:g -e s:XCTYPE:unsigned/**/char:g $? > $@
+
+atomic_ops/sysdeps/loadstore/int_atomic_store.h: \
+        atomic_ops/sysdeps/loadstore/atomic_store.template
+	sed -e s:XSIZE:int:g -e s:XCTYPE:unsigned:g $? > $@
+
+atomic_ops/sysdeps/loadstore/short_atomic_store.h: \
+        atomic_ops/sysdeps/loadstore/atomic_store.template
+	sed -e s:XSIZE:short:g -e s:XCTYPE:unsigned/**/short:g $? > $@