72 lines
2.9 KiB
C
72 lines
2.9 KiB
C
/*
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* Copyright (c) 1994 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1996 by Silicon Graphics. All rights reserved.
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* Copyright (c) 1998 by Fergus Henderson. All rights reserved.
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* Copyright (c) 2000-2010 by Hewlett-Packard Development Company.
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* All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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/* We want to make sure that GC_thread_exit_proc() is unconditionally */
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/* invoked, even if the client is not compiled with -fexceptions, but */
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/* the GC is. The workaround is to put GC_inner_start_routine() in its */
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/* own file (pthread_start.c), and undefine __EXCEPTIONS in the GCC */
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/* case at the top of the file. FIXME: it's still unclear whether this */
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/* will actually cause the exit handler to be invoked last when */
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/* thread_exit is called (and if -fexceptions is used). */
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#if defined(__GNUC__) && defined(__linux__)
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/* We undefine __EXCEPTIONS to avoid using GCC __cleanup__ attribute. */
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/* The current NPTL implementation of pthread_cleanup_push uses */
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/* __cleanup__ attribute when __EXCEPTIONS is defined (-fexceptions). */
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/* The stack unwinding and cleanup with __cleanup__ attributes work */
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/* correctly when everything is compiled with -fexceptions, but it is */
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/* not the requirement for this library clients to use -fexceptions */
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/* everywhere. With __EXCEPTIONS undefined, the cleanup routines are */
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/* registered with __pthread_register_cancel thus should work anyway. */
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# undef __EXCEPTIONS
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#endif
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#include "private/pthread_support.h"
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#if defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS)
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#include <pthread.h>
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#include <sched.h>
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/* Invoked from GC_start_routine(). */
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GC_INNER_PTHRSTART void * GC_CALLBACK GC_inner_start_routine(
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struct GC_stack_base *sb, void *arg)
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{
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void * (*start)(void *);
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void * start_arg;
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void * result;
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volatile GC_thread me =
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GC_start_rtn_prepare_thread(&start, &start_arg, sb, arg);
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# ifndef NACL
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pthread_cleanup_push(GC_thread_exit_proc, me);
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# endif
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result = (*start)(start_arg);
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# if defined(DEBUG_THREADS) && !defined(GC_PTHREAD_START_STANDALONE)
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GC_log_printf("Finishing thread %p\n", (void *)pthread_self());
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# endif
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me -> status = result;
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GC_dirty(me);
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# ifndef NACL
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pthread_cleanup_pop(1);
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/* Cleanup acquires lock, ensuring that we can't exit while */
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/* a collection that thinks we're alive is trying to stop us. */
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# endif
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return result;
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}
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#endif /* GC_PTHREADS */
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