The Tor Browser: comparison security/sandbox/chromium/base/threading/platform_thread

--1:000000000000
+:7425fb61f211
+// Copyright (c) 2012 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/threading/platform_thread.h"
+#include "base/debug/alias.h"
+#include "base/debug/profiler.h"
+#include "base/logging.h"
+#include "base/threading/thread_id_name_manager.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/tracked_objects.h"
+#include "base/win/windows_version.h"
+namespace base {
+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;
+// This function has try handling, so it is separated out of its caller.
+void SetNameInternal(PlatformThreadId thread_id, const char* name) {
+THREADNAME_INFO info;
+info.dwType = 0x1000;
+info.szName = name;
+info.dwThreadID = thread_id;
+info.dwFlags = 0;
+__try {
+RaiseException(kVCThreadNameException, 0, sizeof(info)/sizeof(DWORD),
+reinterpret_cast<DWORD_PTR*>(&info));
+} __except(EXCEPTION_CONTINUE_EXECUTION) {
+}
+}
+struct ThreadParams {
+PlatformThread::Delegate* delegate;
+bool joinable;
+};
+DWORD __stdcall ThreadFunc(void* params) {
+ThreadParams* thread_params = static_cast<ThreadParams*>(params);
+PlatformThread::Delegate* delegate = thread_params->delegate;
+if (!thread_params->joinable)
+base::ThreadRestrictions::SetSingletonAllowed(false);
+/* Retrieve a copy of the thread handle to use as the key in the
+* thread name mapping. */
+PlatformThreadHandle::Handle platform_handle;
+DuplicateHandle(
+GetCurrentProcess(),
+GetCurrentThread(),
+GetCurrentProcess(),
+&platform_handle,
+0,
+FALSE,
+DUPLICATE_SAME_ACCESS);
+ThreadIdNameManager::GetInstance()->RegisterThread(
+platform_handle,
+PlatformThread::CurrentId());
+delete thread_params;
+delegate->ThreadMain();
+ThreadIdNameManager::GetInstance()->RemoveName(
+platform_handle,
+PlatformThread::CurrentId());
+return NULL;
+}
+// CreateThreadInternal() matches PlatformThread::Create(), except that
+// |out_thread_handle| may be NULL, in which case a non-joinable thread is
+// created.
+bool CreateThreadInternal(size_t stack_size,
+PlatformThread::Delegate* delegate,
+PlatformThreadHandle* out_thread_handle) {
+unsigned int flags = 0;
+if (stack_size > 0 && base::win::GetVersion() >= base::win::VERSION_XP) {
+flags = STACK_SIZE_PARAM_IS_A_RESERVATION;
+} else {
+stack_size = 0;
+}
+ThreadParams* params = new ThreadParams;
+params->delegate = delegate;
+params->joinable = out_thread_handle != NULL;
+// 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
+void* thread_handle = CreateThread(
+NULL, stack_size, ThreadFunc, params, flags, NULL);
+if (!thread_handle) {
+delete params;
+return false;
+}
+if (out_thread_handle)
+*out_thread_handle = PlatformThreadHandle(thread_handle);
+else
+CloseHandle(thread_handle);
+return true;
+}
+}  // namespace
+// static
+PlatformThreadId PlatformThread::CurrentId() {
+return GetCurrentThreadId();
+}
+// static
+PlatformThreadHandle PlatformThread::CurrentHandle() {
+NOTIMPLEMENTED(); // See OpenThread()
+return PlatformThreadHandle();
+}
+// static
+void PlatformThread::YieldCurrentThread() {
+::Sleep(0);
+}
+// static
+void PlatformThread::Sleep(TimeDelta duration) {
+// When measured with a high resolution clock, Sleep() sometimes returns much
+// too early. We may need to call it repeatedly to get the desired duration.
+TimeTicks end = TimeTicks::Now() + duration;
+TimeTicks now;
+while ((now = TimeTicks::Now()) < end)
+::Sleep((end - now).InMillisecondsRoundedUp());
+}
+// static
+void PlatformThread::SetName(const char* name) {
+ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
+// On Windows only, we don't need to tell the profiler about the "BrokerEvent"
+// thread, as it exists only in the chrome.exe image, and never spawns or runs
+// tasks (items which could be profiled).  This test avoids the notification,
+// which would also (as a side effect) initialize the profiler in this unused
+// context, including setting up thread local storage, etc.  The performance
+// impact is not terrible, but there is no reason to do initialize it.
+if (0 != strcmp(name, "BrokerEvent"))
+tracked_objects::ThreadData::InitializeThreadContext(name);
+// 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 this image file is instrumented, we raise the exception anyway
+// to provide the profiler with human-readable thread names.
+if (!::IsDebuggerPresent() && !base::debug::IsBinaryInstrumented())
+return;
+SetNameInternal(CurrentId(), name);
+}
+// static
+const char* PlatformThread::GetName() {
+return ThreadIdNameManager::GetInstance()->GetName(CurrentId());
+}
+// static
+bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
+PlatformThreadHandle* thread_handle) {
+DCHECK(thread_handle);
+return CreateThreadInternal(stack_size, delegate, thread_handle);
+}
+// static
+bool PlatformThread::CreateWithPriority(size_t stack_size, Delegate* delegate,
+PlatformThreadHandle* thread_handle,
+ThreadPriority priority) {
+bool result = Create(stack_size, delegate, thread_handle);
+if (result)
+SetThreadPriority(*thread_handle, priority);
+return result;
+}
+// static
+bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
+return CreateThreadInternal(stack_size, delegate, NULL);
+}
+// static
+void PlatformThread::Join(PlatformThreadHandle thread_handle) {
+DCHECK(thread_handle.handle_);
+// TODO(willchan): Enable this check once I can get it to work for Windows
+// shutdown.
+// Joining another thread may block the current thread for a long time, since
+// the thread referred to by |thread_handle| may still be running long-lived /
+// blocking tasks.
+#if 0
+base::ThreadRestrictions::AssertIOAllowed();
+#endif
+// Wait for the thread to exit.  It should already have terminated but make
+// sure this assumption is valid.
+DWORD result = WaitForSingleObject(thread_handle.handle_, INFINITE);
+if (result != WAIT_OBJECT_0) {
+// Debug info for bug 127931.
+DWORD error = GetLastError();
+debug::Alias(&error);
+debug::Alias(&result);
+debug::Alias(&thread_handle.handle_);
+CHECK(false);
+}
+CloseHandle(thread_handle.handle_);
+}
+// static
+void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
+ThreadPriority priority) {
+switch (priority) {
+case kThreadPriority_Normal:
+::SetThreadPriority(handle.handle_, THREAD_PRIORITY_NORMAL);
+break;
+case kThreadPriority_RealtimeAudio:
+::SetThreadPriority(handle.handle_, THREAD_PRIORITY_TIME_CRITICAL);
+break;
+default:
+NOTREACHED() << "Unknown priority.";
+break;
+}
+}
+}  // namespace base

The Tor Browser / file comparison

comparison: security/sandbox/chromium/base/threading/platform_thread_win.cc

security/sandbox/chromium/base/threading/platform_thread_win.cc