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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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2da13fa589
Change-Id: If139a17461644afd0262710631ca413f38f2f66e Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/31040 Commit-Queue: Ewout van Bekkum <ewout@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com>
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_sync/binary_semaphore.h"
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#include "pw_assert/assert.h"
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using pw::chrono::SystemClock;
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namespace pw::sync {
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void BinarySemaphore::release() {
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std::lock_guard lock(native_type_.mutex);
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PW_DCHECK_UINT_LT(native_type_.count, BinarySemaphore::max());
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++native_type_.count;
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native_type_.condition.notify_one();
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}
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void BinarySemaphore::acquire() {
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std::unique_lock lock(native_type_.mutex);
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native_type_.condition.wait(lock, [&] { return native_type_.count != 0; });
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native_type_.count = 0;
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}
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bool BinarySemaphore::try_acquire() noexcept {
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std::lock_guard lock(native_type_.mutex);
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if (native_type_.count != 0) {
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native_type_.count = 0;
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return true;
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}
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return false;
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}
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bool BinarySemaphore::try_acquire_until(
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SystemClock::time_point until_at_least) {
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std::unique_lock lock(native_type_.mutex);
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if (native_type_.condition.wait_until(
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lock, until_at_least, [&] { return native_type_.count != 0; })) {
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native_type_.count = 0;
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return true;
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}
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return false;
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}
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} // namespace pw::sync
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