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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/platform_thread.h"
#include "base/logging.h"
#include "base/win_util.h"
namespace {
// The information on how to set the thread name comes from
// a MSDN article: http://msdn2.microsoft.com/en-us/library/xcb2z8hs.aspx
const DWORD kVCThreadNameException = 0x406D1388;
typedef struct tagTHREADNAME_INFO {
DWORD dwType; // Must be 0x1000.
LPCSTR szName; // Pointer to name (in user addr space).
DWORD dwThreadID; // Thread ID (-1=caller thread).
DWORD dwFlags; // Reserved for future use, must be zero.
} THREADNAME_INFO;
DWORD __stdcall ThreadFunc(void* closure) {
PlatformThread::Delegate* delegate =
static_cast<PlatformThread::Delegate*>(closure);
delegate->ThreadMain();
return 0;
}
} // namespace
// static
PlatformThreadId PlatformThread::CurrentId() {
return GetCurrentThreadId();
}
// static
void PlatformThread::YieldCurrentThread() {
::Sleep(0);
}
// static
void PlatformThread::Sleep(int duration_ms) {
::Sleep(duration_ms);
}
// static
void PlatformThread::SetName(const char* name) {
#ifdef HAVE_SEH_EXCEPTIONS
// The debugger needs to be around to catch the name in the exception. If
// there isn't a debugger, we are just needlessly throwing an exception.
if (!::IsDebuggerPresent())
return;
THREADNAME_INFO info;
info.dwType = 0x1000;
info.szName = name;
info.dwThreadID = CurrentId();
info.dwFlags = 0;
MOZ_SEH_TRY {
RaiseException(kVCThreadNameException, 0, sizeof(info)/sizeof(DWORD),
reinterpret_cast<DWORD_PTR*>(&info));
} MOZ_SEH_EXCEPT(EXCEPTION_CONTINUE_EXECUTION) {
}
#endif
}
// static
bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
PlatformThreadHandle* thread_handle) {
unsigned int flags = 0;
if (stack_size > 0) {
flags = STACK_SIZE_PARAM_IS_A_RESERVATION;
} else {
stack_size = 0;
}
// Using CreateThread here vs _beginthreadex makes thread creation a bit
// faster and doesn't require the loader lock to be available. Our code will
// have to work running on CreateThread() threads anyway, since we run code
// on the Windows thread pool, etc. For some background on the difference:
// http://www.microsoft.com/msj/1099/win32/win321099.aspx
*thread_handle = CreateThread(
NULL, stack_size, ThreadFunc, delegate, flags, NULL);
return *thread_handle != NULL;
}
// static
bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
PlatformThreadHandle thread_handle;
bool result = Create(stack_size, delegate, &thread_handle);
CloseHandle(thread_handle);
return result;
}
// static
void PlatformThread::Join(PlatformThreadHandle thread_handle) {
DCHECK(thread_handle);
// Wait for the thread to exit. It should already have terminated but make
// sure this assumption is valid.
DWORD result = WaitForSingleObject(thread_handle, INFINITE);
DCHECK_EQ(WAIT_OBJECT_0, result);
CloseHandle(thread_handle);
}
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