1 // Copyright 2021 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #include "pw_sync/binary_semaphore.h" 16 17 #include <zephyr/kernel.h> 18 19 namespace pw::sync { 20 try_acquire_for(chrono::SystemClock::duration timeout)21bool BinarySemaphore::try_acquire_for(chrono::SystemClock::duration timeout) { 22 // Use non-blocking try_acquire for negative and zero length durations. 23 if (timeout <= chrono::SystemClock::duration::zero()) { 24 return try_acquire(); 25 } 26 27 #ifndef CONFIG_TIMEOUT_64BIT 28 constexpr chrono::SystemClock::duration kMaxTimeoutMinusOne = 29 chrono::SystemClock::duration(K_FOREVER.ticks - 1); 30 31 while (timeout > kMaxTimeoutMinusOne) { 32 if (k_sem_take(&native_type_, K_TICKS(kMaxTimeoutMinusOne.count())) == 0) { 33 return true; 34 } 35 timeout -= kMaxTimeoutMinusOne; 36 } 37 #endif // CONFIG_TIMEOUT_64BIT 38 39 return k_sem_take(&native_type_, K_TICKS(timeout.count())) == 0; 40 } 41 42 } // namespace pw::sync 43