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// Copyright 2021 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
// 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.
#pragma once
#include <kernel.h>
#include "pw_assert/assert.h"
#include "pw_chrono/system_clock.h"
#include "pw_interrupt/context.h"
#include "pw_sync/binary_semaphore.h"
namespace pw::sync {
inline BinarySemaphore::BinarySemaphore() : native_type_() {
constexpr unsigned int kInitialCount = 0;
k_sem_init(&native_type_, kInitialCount, backend::kBinarySemaphoreMaxValue);
inline BinarySemaphore::~BinarySemaphore() = default;
inline void BinarySemaphore::release() {
inline void BinarySemaphore::acquire() {
PW_ASSERT(k_sem_take(&native_type_, K_FOREVER) == 0);
inline bool BinarySemaphore::try_acquire() noexcept {
return k_sem_take(&native_type_, K_NO_WAIT) == 0;
inline bool BinarySemaphore::try_acquire_until(
chrono::SystemClock::time_point deadline) {
// Note that if this deadline is in the future, it will get rounded up by
// one whole tick due to how try_acquire_for is implemented.
return try_acquire_for(deadline - chrono::SystemClock::now());
inline BinarySemaphore::native_handle_type BinarySemaphore::native_handle() {
return native_type_;
} // namespace pw::sync