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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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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