mirror of
https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
synced 2024-09-20 05:41:06 +00:00
5ff8cc5b2b
The signatures, comments, and docs are updated to reflect the most recent terminology for describing blocking APIs with timeouts and deadlines. Change-Id: Iea7ea5490c44c9ce698a694e532345909bba562f Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/60040 Reviewed-by: Keir Mierle <keir@google.com> Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com> Commit-Queue: Ewout van Bekkum <ewout@google.com>
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Copyright 2020 The Pigweed 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
|
|
//
|
|
// https://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 "pw_sync/binary_semaphore.h"
|
|
|
|
#include "pw_assert/check.h"
|
|
|
|
using pw::chrono::SystemClock;
|
|
|
|
namespace pw::sync {
|
|
|
|
void BinarySemaphore::release() {
|
|
std::lock_guard lock(native_type_.mutex);
|
|
PW_DCHECK_UINT_LT(native_type_.count, BinarySemaphore::max());
|
|
++native_type_.count;
|
|
native_type_.condition.notify_one();
|
|
}
|
|
|
|
void BinarySemaphore::acquire() {
|
|
std::unique_lock lock(native_type_.mutex);
|
|
native_type_.condition.wait(lock, [&] { return native_type_.count != 0; });
|
|
native_type_.count = 0;
|
|
}
|
|
|
|
bool BinarySemaphore::try_acquire() noexcept {
|
|
std::lock_guard lock(native_type_.mutex);
|
|
if (native_type_.count != 0) {
|
|
native_type_.count = 0;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool BinarySemaphore::try_acquire_until(SystemClock::time_point deadline) {
|
|
std::unique_lock lock(native_type_.mutex);
|
|
if (native_type_.condition.wait_until(
|
|
lock, deadline, [&] { return native_type_.count != 0; })) {
|
|
native_type_.count = 0;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
} // namespace pw::sync
|