| // 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 <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 |
