mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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129 lines
3.1 KiB
C++
129 lines
3.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Cross-platform lightweight thread local data wrappers
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#ifndef mozilla_TLS_h_
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#define mozilla_TLS_h_
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#if defined(XP_WIN)
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// This file will get included in any file that wants to add a profiler mark.
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// In order to not bring <windows.h> together we could include windef.h and
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// winbase.h which are sufficient to get the prototypes for the Tls* functions.
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// # include <windef.h>
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// # include <winbase.h>
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// Unfortunately, even including these headers causes us to add a bunch of ugly
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// stuff to our namespace e.g #define CreateEvent CreateEventW
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extern "C" {
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__declspec(dllimport) void * __stdcall TlsGetValue(unsigned long);
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__declspec(dllimport) int __stdcall TlsSetValue(unsigned long, void *);
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__declspec(dllimport) unsigned long __stdcall TlsAlloc();
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}
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#else
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# include <pthread.h>
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# include <signal.h>
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#endif
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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namespace mozilla {
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// sig_safe_t denotes an atomic type which can be read or stored in a single
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// instruction. This means that data of this type is safe to be manipulated
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// from a signal handler, or other similar asynchronous execution contexts.
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#if defined(XP_WIN)
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typedef unsigned long sig_safe_t;
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#else
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typedef sig_atomic_t sig_safe_t;
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#endif
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/*
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* Thread Local Storage helpers.
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*
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* Usage:
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*
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* Only static-storage-duration (e.g. global variables, or static class members)
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* objects of this class should be instantiated. This class relies on
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* zero-initialization, which is implicit for static-storage-duration objects.
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* It doesn't have a custom default constructor, to avoid static initializers.
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*
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* API usage:
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*
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* // Create a TLS item
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* mozilla::ThreadLocal<int> tlsKey;
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* if (!tlsKey.init()) {
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* // deal with the error
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* }
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*
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* // Set the TLS value
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* tlsKey.set(123);
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*
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* // Get the TLS value
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* int value = tlsKey.get();
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*/
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template <typename T>
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class ThreadLocal
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{
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#if defined(XP_WIN)
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typedef unsigned long key_t;
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#else
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typedef pthread_key_t key_t;
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#endif
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public:
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MOZ_WARN_UNUSED_RESULT inline bool init();
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inline T* get() const;
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inline bool set(const T* value);
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bool initialized() const {
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return inited;
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}
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private:
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key_t key;
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bool inited;
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};
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template <typename T>
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inline bool
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ThreadLocal<T>::init() {
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MOZ_ASSERT(!initialized());
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#ifdef XP_WIN
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key = TlsAlloc();
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inited = key != 0xFFFFFFFFUL; // TLS_OUT_OF_INDEXES
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#else
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inited = !pthread_key_create(&key, NULL);
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#endif
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return inited;
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}
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template <typename T>
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inline T*
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ThreadLocal<T>::get() const {
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MOZ_ASSERT(initialized());
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#ifdef XP_WIN
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return reinterpret_cast<T*>(TlsGetValue(key));
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#else
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return reinterpret_cast<T*>(pthread_getspecific(key));
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#endif
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}
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template <typename T>
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inline bool
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ThreadLocal<T>::set(const T* value) {
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MOZ_ASSERT(initialized());
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#ifdef XP_WIN
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return TlsSetValue(key, const_cast<T*>(value));
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#else
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return !pthread_setspecific(key, value);
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#endif
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}
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} // namespace mozilla
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#endif // mozilla_TLS_h_
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