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// 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/shared_event.h"
#include "base/logging.h"
#include "base/time.h"
SharedEvent::~SharedEvent() {
Close();
}
bool SharedEvent::Create(bool manual_reset, bool initial_state) {
DCHECK(!event_handle_);
event_handle_ = CreateEvent(NULL /* security attributes */, manual_reset,
initial_state, NULL /* name */);
DCHECK(event_handle_);
return !!event_handle_;
}
void SharedEvent::Close() {
if (event_handle_) {
BOOL rv = CloseHandle(event_handle_);
DCHECK(rv);
event_handle_ = NULL;
}
}
bool SharedEvent::SetSignaledState(bool signaled) {
DCHECK(event_handle_);
BOOL rv;
if (signaled) {
rv = SetEvent(event_handle_);
} else {
rv = ResetEvent(event_handle_);
}
return rv ? true : false;
}
bool SharedEvent::IsSignaled() {
DCHECK(event_handle_);
DWORD event_state = ::WaitForSingleObject(event_handle_, 0);
DCHECK(WAIT_OBJECT_0 == event_state || WAIT_TIMEOUT == event_state);
return event_state == WAIT_OBJECT_0;
}
bool SharedEvent::WaitUntilSignaled(const TimeDelta& timeout) {
DCHECK(event_handle_);
DWORD event_state = ::WaitForSingleObject(event_handle_,
static_cast<DWORD>(timeout.InMillisecondsF()));
return event_state == WAIT_OBJECT_0;
}
bool SharedEvent::WaitForeverUntilSignaled() {
DCHECK(event_handle_);
DWORD event_state = ::WaitForSingleObject(event_handle_,
INFINITE);
return event_state == WAIT_OBJECT_0;
}
bool SharedEvent::ShareToProcess(ProcessHandle process,
SharedEventHandle *new_handle) {
DCHECK(event_handle_);
HANDLE event_handle_copy;
BOOL rv = DuplicateHandle(GetCurrentProcess(), event_handle_, process,
&event_handle_copy, 0, FALSE, DUPLICATE_SAME_ACCESS);
if (rv)
*new_handle = event_handle_copy;
return rv ? true : false;
}
bool SharedEvent::GiveToProcess(ProcessHandle process,
SharedEventHandle *new_handle) {
bool rv = ShareToProcess(process, new_handle);
if (rv)
Close();
return rv;
}
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