1 files changed, 132 insertions, 0 deletions
diff --git a/include/libcamera/base/mutex.h b/include/libcamera/base/mutex.h
new file mode 100644
index 00000000..2d23e49e
--- /dev/null
+++ b/include/libcamera/base/mutex.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * mutex.h - Mutex classes with clang thread safety annotation
+ */
+
+#pragma once
+
+#include <condition_variable>
+#include <mutex>
+
+#include <libcamera/base/thread_annotations.h>
+
+namespace libcamera {
+
+/* \todo using Mutex = std::mutex if libc++ is used. */
+
+#ifndef __DOXYGEN__
+
+class LIBCAMERA_TSA_CAPABILITY("mutex") Mutex final
+{
+public:
+	constexpr Mutex()
+	{
+	}
+
+	void lock() LIBCAMERA_TSA_ACQUIRE()
+	{
+		mutex_.lock();
+	}
+
+	void unlock() LIBCAMERA_TSA_RELEASE()
+	{
+		mutex_.unlock();
+	}
+
+private:
+	friend class MutexLocker;
+
+	std::mutex mutex_;
+};
+
+class LIBCAMERA_TSA_SCOPED_CAPABILITY MutexLocker final
+{
+public:
+	explicit MutexLocker(Mutex &mutex) LIBCAMERA_TSA_ACQUIRE(mutex)
+		: lock_(mutex.mutex_)
+	{
+	}
+
+	MutexLocker(Mutex &mutex, std::defer_lock_t t) noexcept LIBCAMERA_TSA_EXCLUDES(mutex)
+		: lock_(mutex.mutex_, t)
+	{
+	}
+
+	~MutexLocker() LIBCAMERA_TSA_RELEASE()
+	{
+	}
+
+	void lock() LIBCAMERA_TSA_ACQUIRE()
+	{
+		lock_.lock();
+	}
+
+	bool try_lock() LIBCAMERA_TSA_TRY_ACQUIRE(true)
+	{
+		return lock_.try_lock();
+	}
+
+	void unlock() LIBCAMERA_TSA_RELEASE()
+	{
+		lock_.unlock();
+	}
+
+private:
+	friend class ConditionVariable;
+
+	std::unique_lock<std::mutex> lock_;
+};
+
+class ConditionVariable final
+{
+public:
+	ConditionVariable()
+	{
+	}
+
+	void notify_one() noexcept
+	{
+		cv_.notify_one();
+	}
+
+	void notify_all() noexcept
+	{
+		cv_.notify_all();
+	}
+
+	template<class Predicate>
+	void wait(MutexLocker &locker, Predicate stopWaiting)
+	{
+		cv_.wait(locker.lock_, stopWaiting);
+	}
+
+	template<class Rep, class Period, class Predicate>
+	bool wait_for(MutexLocker &locker,
+		      const std::chrono::duration<Rep, Period> &relTime,
+		      Predicate stopWaiting)
+	{
+		return cv_.wait_for(locker.lock_, relTime, stopWaiting);
+	}
+
+private:
+	std::condition_variable cv_;
+};
+
+#else /* __DOXYGEN__ */
+
+class Mutex final
+{
+};
+
+class MutexLocker final
+{
+};
+
+class ConditionVariable final
+{
+};
+
+#endif /* __DOXYGEN__ */
+} /* namespace libcamera */