mirror of
https://github.com/kidfromjupiter/nearby.git
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60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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 "internal/platform/implementation/shared/posix_condition_variable.h"
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#include "absl/time/time.h"
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#include <cerrno>
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namespace nearby {
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namespace posix {
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ConditionVariable::ConditionVariable(Mutex* mutex)
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: mutex_(mutex), attr_(), cond_() {
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pthread_condattr_init(&attr_);
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pthread_cond_init(&cond_, &attr_);
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}
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ConditionVariable::~ConditionVariable() {
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pthread_cond_destroy(&cond_);
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pthread_condattr_destroy(&attr_);
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}
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void ConditionVariable::Notify() { pthread_cond_broadcast(&cond_); }
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Exception ConditionVariable::Wait() {
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pthread_cond_wait(&cond_, &(mutex_->mutex_));
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return {Exception::kSuccess};
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}
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Exception ConditionVariable::Wait(absl::Duration timeout) {
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// Calculate absolute deadline as timespec for pthread_cond_timedwait.
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absl::Time deadline = absl::Now() + timeout;
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int64_t nanos = absl::ToUnixNanos(deadline);
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timespec ts{}; // zero-initialize to satisfy static analyzers
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ts.tv_sec = static_cast<time_t>(nanos / 1000000000LL);
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ts.tv_nsec = static_cast<long>(nanos % 1000000000LL);
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int rc = pthread_cond_timedwait(&cond_, &(mutex_->mutex_), &ts);
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if (rc == 0) return {Exception::kSuccess};
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if (rc == ETIMEDOUT) return {Exception::kTimeout};
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if (rc == EINTR) return {Exception::kInterrupted};
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return {Exception::kFailed};
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}
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} // namespace posix
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} // namespace nearby
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