pw_sync: Adds semaphores & mutexes
Adds the BinarySemaphore, CountingSemaphore, and Mutex to the
pw_sync module along with an STL backend for each.
Change-Id: I54a3a64e702202a319ed2c9068bf37412d3fd240
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/24241
Reviewed-by: Ewout van Bekkum <ewout@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
diff --git a/pw_sync/binary_semaphore.cc b/pw_sync/binary_semaphore.cc
new file mode 100644
index 0000000..439504b
--- /dev/null
+++ b/pw_sync/binary_semaphore.cc
@@ -0,0 +1,49 @@
+// Copyright 2020 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"
+
+using pw::chrono::SystemClock;
+
+extern "C" void pw_sync_BinarySemaphore_Release(
+ pw_sync_BinarySemaphore* semaphore) {
+ semaphore->release();
+}
+
+extern "C" void pw_sync_BinarySemaphore_Acquire(
+ pw_sync_BinarySemaphore* semaphore) {
+ semaphore->acquire();
+}
+
+extern "C" bool pw_sync_BinarySemaphore_TryAcquire(
+ pw_sync_BinarySemaphore* semaphore) {
+ return semaphore->try_acquire();
+}
+
+extern "C" bool pw_sync_BinarySemaphore_TryAcquireFor(
+ pw_sync_BinarySemaphore* semaphore,
+ pw_chrono_SystemClock_TickCount for_at_least) {
+ return semaphore->try_acquire_for(SystemClock::duration(for_at_least));
+}
+
+extern "C" bool pw_sync_BinarySemaphore_TryAcquireUntil(
+ pw_sync_BinarySemaphore* semaphore,
+ pw_chrono_SystemClock_TimePoint until_at_least) {
+ return semaphore->try_acquire_until(SystemClock::time_point(
+ SystemClock::duration(until_at_least.ticks_since_epoch)));
+}
+
+extern "C" ptrdiff_t pw_sync_BinarySemaphore_Max(void) {
+ return pw::sync::BinarySemaphore::max();
+}