111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
// Copyright 2014 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/synchronization/semaphore.h"
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#include <errno.h>
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#include <math.h>
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#include <time.h>
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#include <chrono>
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#include "base/check_op.h"
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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#include "build/build_config.h"
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#include "util/misc/time.h"
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namespace crashpad {
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#if BUILDFLAG(IS_ANDROID)
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Semaphore::Semaphore(int value) : cv_(), mutex_(), value_(value) {}
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Semaphore::~Semaphore() = default;
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void Semaphore::Wait() {
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std::unique_lock<std::mutex> lock(mutex_);
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cv_.wait(lock, [this] { return this->value_ > 0; });
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--value_;
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}
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bool Semaphore::TimedWait(double seconds) {
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DCHECK_GE(seconds, 0.0);
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if (isinf(seconds)) {
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Wait();
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return true;
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}
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std::unique_lock<std::mutex> lock(mutex_);
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if (!cv_.wait_for(lock, std::chrono::duration<double>(seconds), [this] {
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return this->value_ > 0;
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})) {
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return false;
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}
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--value_;
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return true;
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}
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void Semaphore::Signal() {
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std::lock_guard<std::mutex> lock(mutex_);
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++value_;
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cv_.notify_one();
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}
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#elif !BUILDFLAG(IS_APPLE)
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Semaphore::Semaphore(int value) {
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PCHECK(sem_init(&semaphore_, 0, value) == 0) << "sem_init";
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}
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Semaphore::~Semaphore() {
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PCHECK(sem_destroy(&semaphore_) == 0) << "sem_destroy";
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}
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void Semaphore::Wait() {
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PCHECK(HANDLE_EINTR(sem_wait(&semaphore_)) == 0) << "sem_wait";
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}
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bool Semaphore::TimedWait(double seconds) {
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DCHECK_GE(seconds, 0.0);
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if (isinf(seconds)) {
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Wait();
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return true;
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}
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timespec current_time;
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if (clock_gettime(CLOCK_REALTIME, ¤t_time) != 0) {
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PLOG(ERROR) << "clock_gettime";
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return false;
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}
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timespec timeout;
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timeout.tv_sec = seconds;
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timeout.tv_nsec = (seconds - trunc(seconds)) * 1E9;
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AddTimespec(current_time, timeout, &timeout);
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int rv = HANDLE_EINTR(sem_timedwait(&semaphore_, &timeout));
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PCHECK(rv == 0 || errno == ETIMEDOUT) << "sem_timedwait";
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return rv == 0;
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}
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void Semaphore::Signal() {
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PCHECK(sem_post(&semaphore_) == 0) << "sem_post";
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}
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#endif // BUILDFLAG(IS_ANDROID)
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} // namespace crashpad
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