libcamera/jmondi/libcamera.git - Jacopo Mondi's clone of libcamera

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/* 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/private.h> #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 */


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