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+/*
+ * Copyright (C) 2020 Rockchip Electronics Co., Ltd.
+ * Authors:
+ *  PutinLee <putin.lee@rock-chips.com>
+ *
+ * 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
+ *
+ *      http://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.
+ */
+
+
+#ifndef _LIBS_RGA_MUTEX_H
+#define _LIBS_RGA_MUTEX_H
+
+#ifndef ANDROID
+#include <stdint.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include <pthread.h>
+
+
+// Enable thread safety attributes only with clang.
+// The attributes can be safely erased when compiling with other compilers.
+#if defined(__clang__) && (!defined(SWIG))
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#else
+#define THREAD_ANNOTATION_ATTRIBUTE__(x)  // no-op
+#endif
+
+#define CAPABILITY(x) THREAD_ANNOTATION_ATTRIBUTE__(capability(x))
+
+#define SCOPED_CAPABILITY THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
+
+#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+
+#define ACQUIRED_BEFORE(...) THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
+
+#define ACQUIRED_AFTER(...) THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
+
+#define REQUIRES(...) THREAD_ANNOTATION_ATTRIBUTE__(requires_capability(__VA_ARGS__))
+
+#define REQUIRES_SHARED(...) THREAD_ANNOTATION_ATTRIBUTE__(requires_shared_capability(__VA_ARGS__))
+
+#define ACQUIRE(...) THREAD_ANNOTATION_ATTRIBUTE__(acquire_capability(__VA_ARGS__))
+
+#define ACQUIRE_SHARED(...) THREAD_ANNOTATION_ATTRIBUTE__(acquire_shared_capability(__VA_ARGS__))
+
+#define RELEASE(...) THREAD_ANNOTATION_ATTRIBUTE__(release_capability(__VA_ARGS__))
+
+#define RELEASE_SHARED(...) THREAD_ANNOTATION_ATTRIBUTE__(release_shared_capability(__VA_ARGS__))
+
+#define TRY_ACQUIRE(...) THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_capability(__VA_ARGS__))
+
+#define TRY_ACQUIRE_SHARED(...) \
+    THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_shared_capability(__VA_ARGS__))
+
+#define EXCLUDES(...) THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
+
+#define ASSERT_CAPABILITY(x) THREAD_ANNOTATION_ATTRIBUTE__(assert_capability(x))
+
+#define ASSERT_SHARED_CAPABILITY(x) THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_capability(x))
+
+#define RETURN_CAPABILITY(x) THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
+
+#define NO_THREAD_SAFETY_ANALYSIS THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+
+class Condition;
+
+/*
+ * NOTE: This class is for code that builds on Win32.  Its usage is
+ * deprecated for code which doesn't build for Win32.  New code which
+ * doesn't build for Win32 should use std::mutex and std::lock_guard instead.
+ *
+ * Simple mutex class.  The implementation is system-dependent.
+ *
+ * The mutex must be unlocked by the thread that locked it.  They are not
+ * recursive, i.e. the same thread can't lock it multiple times.
+ */
+class CAPABILITY("mutex") Mutex {
+  public:
+    enum {
+        PRIVATE = 0,
+        SHARED = 1
+    };
+
+    Mutex();
+    explicit Mutex(const char* name);
+    explicit Mutex(int type, const char* name = nullptr);
+    ~Mutex();
+
+    // lock or unlock the mutex
+    int32_t lock() ACQUIRE();
+    void unlock() RELEASE();
+
+    // lock if possible; returns 0 on success, error otherwise
+    int32_t tryLock() TRY_ACQUIRE(0);
+
+    int32_t timedLock(int64_t timeoutNs) TRY_ACQUIRE(0);
+
+    // Manages the mutex automatically. It'll be locked when Autolock is
+    // constructed and released when Autolock goes out of scope.
+    class SCOPED_CAPABILITY Autolock {
+      public:
+        inline explicit Autolock(Mutex& mutex) ACQUIRE(mutex) : mLock(mutex) {
+            mLock.lock();
+        }
+        inline explicit Autolock(Mutex* mutex) ACQUIRE(mutex) : mLock(*mutex) {
+            mLock.lock();
+        }
+        inline ~Autolock() RELEASE() {
+            mLock.unlock();
+        }
+
+      private:
+        Mutex& mLock;
+        // Cannot be copied or moved - declarations only
+        Autolock(const Autolock&);
+        Autolock& operator=(const Autolock&);
+    };
+
+  private:
+    friend class Condition;
+
+    // A mutex cannot be copied
+    Mutex(const Mutex&);
+    Mutex& operator=(const Mutex&);
+
+    pthread_mutex_t mMutex;
+};
+
+// ---------------------------------------------------------------------------
+inline Mutex::Mutex() {
+    pthread_mutex_init(&mMutex, nullptr);
+}
+inline Mutex::Mutex(__attribute__((unused)) const char* name) {
+    pthread_mutex_init(&mMutex, nullptr);
+}
+inline Mutex::Mutex(int type, __attribute__((unused)) const char* name) {
+    if (type == SHARED) {
+        pthread_mutexattr_t attr;
+        pthread_mutexattr_init(&attr);
+        pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+        pthread_mutex_init(&mMutex, &attr);
+        pthread_mutexattr_destroy(&attr);
+    } else {
+        pthread_mutex_init(&mMutex, nullptr);
+    }
+}
+inline Mutex::~Mutex() {
+    pthread_mutex_destroy(&mMutex);
+}
+inline int32_t Mutex::lock() {
+    return -pthread_mutex_lock(&mMutex);
+}
+inline void Mutex::unlock() {
+    pthread_mutex_unlock(&mMutex);
+}
+inline int32_t Mutex::tryLock() {
+    return -pthread_mutex_trylock(&mMutex);
+}
+inline int32_t Mutex::timedLock(int64_t timeoutNs) {
+    timespec now;
+    clock_gettime(CLOCK_REALTIME, &now);
+    timeoutNs += now.tv_sec*1000000000 + now.tv_nsec;
+    const struct timespec ts = {
+        /* .tv_sec = */ static_cast<time_t>(timeoutNs / 1000000000),
+        /* .tv_nsec = */ static_cast<long>(timeoutNs % 1000000000),
+    };
+    return -pthread_mutex_timedlock(&mMutex, &ts);
+}
+
+// ---------------------------------------------------------------------------
+
+/*
+ * Automatic mutex.  Declare one of these at the top of a function.
+ * When the function returns, it will go out of scope, and release the
+ * mutex.
+ */
+
+typedef Mutex::Autolock AutoMutex;
+#endif // __ANDROID_VNDK__
+#endif // _LIBS_RGA_MUTEX_H