43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
// Copyright 2021 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 <kernel.h>
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namespace pw::sync {
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bool BinarySemaphore::try_acquire_for(chrono::SystemClock::duration timeout) {
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// Use non-blocking try_acquire for negative and zero length durations.
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if (timeout <= chrono::SystemClock::duration::zero()) {
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return try_acquire();
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}
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#ifndef CONFIG_TIMEOUT_64BIT
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constexpr chrono::SystemClock::duration kMaxTimeoutMinusOne =
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chrono::SystemClock::duration(K_FOREVER.ticks - 1);
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while (timeout > kMaxTimeoutMinusOne) {
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if (k_sem_take(&native_type_, K_TICKS(kMaxTimeoutMinusOne.count())) == 0) {
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return true;
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}
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timeout -= kMaxTimeoutMinusOne;
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}
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#endif // CONFIG_TIMEOUT_64BIT
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return k_sem_take(&native_type_, K_TICKS(timeout.count())) == 0;
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}
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} // namespace pw::sync
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