// Copyright 2014 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util/synchronization/semaphore.h"
#include <cmath>
#include <limits>
#include <ostream>
#include "base/check_op.h"
namespace crashpad {
Semaphore::Semaphore(int value)
: semaphore_(CreateSemaphore(nullptr,
value,
std::numeric_limits<LONG>::max(),
nullptr)) {
PCHECK(semaphore_) << "CreateSemaphore";
}
Semaphore::~Semaphore() {
PCHECK(CloseHandle(semaphore_));
}
void Semaphore::Wait() {
PCHECK(WaitForSingleObject(semaphore_, INFINITE) == WAIT_OBJECT_0);
}
bool Semaphore::TimedWait(double seconds) {
DCHECK_GE(seconds, 0.0);
if (std::isinf(seconds)) {
Wait();
return true;
}
DWORD rv = WaitForSingleObject(semaphore_, static_cast<DWORD>(seconds * 1E3));
PCHECK(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT) << "WaitForSingleObject";
return rv == WAIT_OBJECT_0;
}
void Semaphore::Signal() {
PCHECK(ReleaseSemaphore(semaphore_, 1, nullptr));
}
} // namespace crashpad