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108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/threading/thread_local_storage.h"
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#include <windows.h>
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#include "base/logging.h"
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namespace base {
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namespace internal {
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bool PlatformThreadLocalStorage::AllocTLS(TLSKey* key) {
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TLSKey value = TlsAlloc();
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if (value != TLS_OUT_OF_INDEXES) {
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*key = value;
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return true;
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}
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return false;
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}
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void PlatformThreadLocalStorage::FreeTLS(TLSKey key) {
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BOOL ret = TlsFree(key);
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DCHECK(ret);
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}
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void PlatformThreadLocalStorage::SetTLSValue(TLSKey key, void* value) {
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BOOL ret = TlsSetValue(key, value);
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DCHECK(ret);
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}
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} // namespace internal
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} // namespace base
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// Thread Termination Callbacks.
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// Windows doesn't support a per-thread destructor with its
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// TLS primitives. So, we build it manually by inserting a
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// function to be called on each thread's exit.
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// This magic is from http://www.codeproject.com/threads/tls.asp
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// and it works for VC++ 7.0 and later.
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// Force a reference to _tls_used to make the linker create the TLS directory
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// if it's not already there. (e.g. if __declspec(thread) is not used).
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// Force a reference to p_thread_callback_base to prevent whole program
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// optimization from discarding the variable.
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#ifdef _WIN64
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#pragma comment(linker, "/INCLUDE:_tls_used")
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#pragma comment(linker, "/INCLUDE:p_thread_callback_base")
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#else // _WIN64
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#pragma comment(linker, "/INCLUDE:__tls_used")
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#pragma comment(linker, "/INCLUDE:_p_thread_callback_base")
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#endif // _WIN64
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// Static callback function to call with each thread termination.
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void NTAPI OnThreadExit(PVOID module, DWORD reason, PVOID reserved) {
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// On XP SP0 & SP1, the DLL_PROCESS_ATTACH is never seen. It is sent on SP2+
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// and on W2K and W2K3. So don't assume it is sent.
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if (DLL_THREAD_DETACH == reason || DLL_PROCESS_DETACH == reason)
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base::internal::PlatformThreadLocalStorage::OnThreadExit();
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}
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// .CRT$XLA to .CRT$XLZ is an array of PIMAGE_TLS_CALLBACK pointers that are
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// called automatically by the OS loader code (not the CRT) when the module is
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// loaded and on thread creation. They are NOT called if the module has been
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// loaded by a LoadLibrary() call. It must have implicitly been loaded at
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// process startup.
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// By implicitly loaded, I mean that it is directly referenced by the main EXE
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// or by one of its dependent DLLs. Delay-loaded DLL doesn't count as being
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// implicitly loaded.
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//
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// See VC\crt\src\tlssup.c for reference.
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// extern "C" suppresses C++ name mangling so we know the symbol name for the
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// linker /INCLUDE:symbol pragma above.
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extern "C" {
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// The linker must not discard p_thread_callback_base. (We force a reference
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// to this variable with a linker /INCLUDE:symbol pragma to ensure that.) If
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// this variable is discarded, the OnThreadExit function will never be called.
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#ifdef _WIN64
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// .CRT section is merged with .rdata on x64 so it must be constant data.
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#pragma const_seg(".CRT$XLB")
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// When defining a const variable, it must have external linkage to be sure the
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// linker doesn't discard it.
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extern const PIMAGE_TLS_CALLBACK p_thread_callback_base;
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const PIMAGE_TLS_CALLBACK p_thread_callback_base = OnThreadExit;
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// Reset the default section.
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#pragma const_seg()
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#else // _WIN64
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#pragma data_seg(".CRT$XLB")
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PIMAGE_TLS_CALLBACK p_thread_callback_base = OnThreadExit;
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// Reset the default section.
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#pragma data_seg()
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#endif // _WIN64
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} // extern "C"
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