1 files changed, 42 insertions, 0 deletions
diff --git a/pw_chre/include/chre/target_platform/condition_variable_impl.h b/pw_chre/include/chre/target_platform/condition_variable_impl.h
new file mode 100644
index 000000000..2d826ec06
--- /dev/null
+++ b/pw_chre/include/chre/target_platform/condition_variable_impl.h
@@ -0,0 +1,42 @@
+// Copyright 2023 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.
+
+#pragma once
+#include "chre/platform/condition_variable.h"
+#include "pw_chrono/system_clock.h"
+
+namespace chre {
+
+inline ConditionVariable::ConditionVariable() {}
+
+inline ConditionVariable::~ConditionVariable() {}
+
+inline void ConditionVariable::notify_one() { notification_.release(); }
+
+inline void ConditionVariable::wait(Mutex& mutex) {
+  mutex.unlock();
+  notification_.acquire();
+  mutex.lock();
+}
+
+inline bool ConditionVariable::wait_for(Mutex& mutex, Nanoseconds timeout) {
+  mutex.unlock();
+  auto pw_timeout = pw::chrono::SystemClock::for_at_least(
+      std::chrono::nanoseconds(timeout.toRawNanoseconds()));
+  bool did_acquire = notification_.try_acquire_for(pw_timeout);
+  mutex.lock();
+  return did_acquire;
+}
+
+}  // namespace chre