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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
//
// 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 <zephyr/kernel.h>
namespace pw::sync {
bool BinarySemaphore::try_acquire_for(chrono::SystemClock::duration timeout) {
// Use non-blocking try_acquire for negative and zero length durations.
if (timeout <= chrono::SystemClock::duration::zero()) {
return try_acquire();
}
#ifndef CONFIG_TIMEOUT_64BIT
constexpr chrono::SystemClock::duration kMaxTimeoutMinusOne =
chrono::SystemClock::duration(K_FOREVER.ticks - 1);
while (timeout > kMaxTimeoutMinusOne) {
if (k_sem_take(&native_type_, K_TICKS(kMaxTimeoutMinusOne.count())) == 0) {
return true;
}
timeout -= kMaxTimeoutMinusOne;
}
#endif // CONFIG_TIMEOUT_64BIT
return k_sem_take(&native_type_, K_TICKS(timeout.count())) == 0;
}
} // namespace pw::sync