Move CancellationFlag and WaitableEvent to the synchronization subdirectory....

base/waitable_event_win.cc

-// 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/waitable_event.h"
-
-#include <math.h>
-#include <windows.h>
-
-#include "base/logging.h"
-#include "base/time.h"
-
-namespace base {
-
-WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
-    : handle_(CreateEvent(NULL, manual_reset, signaled, NULL)) {
-  // We're probably going to crash anyways if this is ever NULL, so we might as
-  // well make our stack reports more informative by crashing here.
-  CHECK(handle_);
-}
-
-WaitableEvent::WaitableEvent(HANDLE handle)
-    : handle_(handle) {
-  CHECK(handle) << "Tried to create WaitableEvent from NULL handle";
-}
-
-WaitableEvent::~WaitableEvent() {
-  CloseHandle(handle_);
-}
-
-HANDLE WaitableEvent::Release() {
-  HANDLE rv = handle_;
-  handle_ = INVALID_HANDLE_VALUE;
-  return rv;
-}
-
-void WaitableEvent::Reset() {
-  ResetEvent(handle_);
-}
-
-void WaitableEvent::Signal() {
-  SetEvent(handle_);
-}
-
-bool WaitableEvent::IsSignaled() {
-  return TimedWait(TimeDelta::FromMilliseconds(0));
-}
-
-bool WaitableEvent::Wait() {
-  DWORD result = WaitForSingleObject(handle_, INFINITE);
-  // It is most unexpected that this should ever fail.  Help consumers learn
-  // about it if it should ever fail.
-  DCHECK(result == WAIT_OBJECT_0) << "WaitForSingleObject failed";
-  return result == WAIT_OBJECT_0;
-}
-
-bool WaitableEvent::TimedWait(const TimeDelta& max_time) {
-  DCHECK(max_time >= TimeDelta::FromMicroseconds(0));
-  // Be careful here.  TimeDelta has a precision of microseconds, but this API
-  // is in milliseconds.  If there are 5.5ms left, should the delay be 5 or 6?
-  // It should be 6 to avoid returning too early.
-  double timeout = ceil(max_time.InMillisecondsF());
-  DWORD result = WaitForSingleObject(handle_, static_cast<DWORD>(timeout));
-  switch (result) {
-    case WAIT_OBJECT_0:
-      return true;
-    case WAIT_TIMEOUT:
-      return false;
-  }
-  // It is most unexpected that this should ever fail.  Help consumers learn
-  // about it if it should ever fail.
-  NOTREACHED() << "WaitForSingleObject failed";
-  return false;
-}
-
-// static
-size_t WaitableEvent::WaitMany(WaitableEvent** events, size_t count) {
-  HANDLE handles[MAXIMUM_WAIT_OBJECTS];
-  CHECK_LE(count, MAXIMUM_WAIT_OBJECTS)
-      << "Can only wait on " << MAXIMUM_WAIT_OBJECTS << " with WaitMany";
-
-  for (size_t i = 0; i < count; ++i)
-    handles[i] = events[i]->handle();
-
-  // The cast is safe because count is small - see the CHECK above.
-  DWORD result =
-      WaitForMultipleObjects(static_cast<DWORD>(count),
-                             handles,
-                             FALSE,      // don't wait for all the objects
-                             INFINITE);  // no timeout
-  if (result >= WAIT_OBJECT_0 + count) {
-    NOTREACHED() << "WaitForMultipleObjects failed: " << GetLastError();
-    return 0;
-  }
-
-  return result - WAIT_OBJECT_0;
-}
-
-}  // namespace base