The Tor Browser: media/omx-plugin/include/ics/utils/threads.h@b8a032363ba2 (annotated)

media/omx-plugin/include/ics/utils/threads.h@b8a032363ba2 (annotated)

media/omx-plugin/include/ics/utils/threads.h

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * Copyright (C) 2007 The Android Open Source Project
  *
  * 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_UTILS_THREADS_H
 #define _LIBS_UTILS_THREADS_H
 #include <stdint.h>
 #include <sys/types.h>
 #include <time.h>
 #include <system/graphics.h>
 #if defined(HAVE_PTHREADS)
 # include <pthread.h>
 #endif
 // ------------------------------------------------------------------
 // C API
 #ifdef __cplusplus
 extern "C" {
 #endif
 typedef void* android_thread_id_t;
 typedef int (*android_thread_func_t)(void*);
 enum {
     /*
      * ***********************************************
      * ** Keep in sync with android.os.Process.java **
      * ***********************************************
      *
      * This maps directly to the "nice" priorities we use in Android.
      * A thread priority should be chosen inverse-proportionally to
      * the amount of work the thread is expected to do. The more work
      * a thread will do, the less favorable priority it should get so that
      * it doesn't starve the system. Threads not behaving properly might
      * be "punished" by the kernel.
      * Use the levels below when appropriate. Intermediate values are
      * acceptable, preferably use the {MORE|LESS}_FAVORABLE constants below.
      */
     ANDROID_PRIORITY_LOWEST         =  19,
     /* use for background tasks */
     ANDROID_PRIORITY_BACKGROUND     =  10,
     /* most threads run at normal priority */
     ANDROID_PRIORITY_NORMAL         =   0,
     /* threads currently running a UI that the user is interacting with */
     ANDROID_PRIORITY_FOREGROUND     =  -2,
     /* the main UI thread has a slightly more favorable priority */
     ANDROID_PRIORITY_DISPLAY        =  -4,
     /* ui service treads might want to run at a urgent display (uncommon) */
     ANDROID_PRIORITY_URGENT_DISPLAY =  HAL_PRIORITY_URGENT_DISPLAY,
     /* all normal audio threads */
     ANDROID_PRIORITY_AUDIO          = -16,
     /* service audio threads (uncommon) */
     ANDROID_PRIORITY_URGENT_AUDIO   = -19,
     /* should never be used in practice. regular process might not
      * be allowed to use this level */
     ANDROID_PRIORITY_HIGHEST        = -20,
     ANDROID_PRIORITY_DEFAULT        = ANDROID_PRIORITY_NORMAL,
     ANDROID_PRIORITY_MORE_FAVORABLE = -1,
     ANDROID_PRIORITY_LESS_FAVORABLE = +1,
 };
 enum {
     ANDROID_TGROUP_DEFAULT          = 0,
     ANDROID_TGROUP_BG_NONINTERACT   = 1,
     ANDROID_TGROUP_FG_BOOST         = 2,
     ANDROID_TGROUP_MAX              = ANDROID_TGROUP_FG_BOOST,
 };
 // Create and run a new thread.
 extern int androidCreateThread(android_thread_func_t, void *);
 // Create thread with lots of parameters
 extern int androidCreateThreadEtc(android_thread_func_t entryFunction,
                                   void *userData,
                                   const char* threadName,
                                   int32_t threadPriority,
                                   size_t threadStackSize,
                                   android_thread_id_t *threadId);
 // Get some sort of unique identifier for the current thread.
 extern android_thread_id_t androidGetThreadId();
 // Low-level thread creation -- never creates threads that can
 // interact with the Java VM.
 extern int androidCreateRawThreadEtc(android_thread_func_t entryFunction,
                                      void *userData,
                                      const char* threadName,
                                      int32_t threadPriority,
                                      size_t threadStackSize,
                                      android_thread_id_t *threadId);
 // Used by the Java Runtime to control how threads are created, so that
 // they can be proper and lovely Java threads.
 typedef int (*android_create_thread_fn)(android_thread_func_t entryFunction,
                                         void *userData,
                                         const char* threadName,
                                         int32_t threadPriority,
                                         size_t threadStackSize,
                                         android_thread_id_t *threadId);
 extern void androidSetCreateThreadFunc(android_create_thread_fn func);
 // ------------------------------------------------------------------
 // Extra functions working with raw pids.
 // Get pid for the current thread.
 extern pid_t androidGetTid();
 // Change the scheduling group of a particular thread.  The group
 // should be one of the ANDROID_TGROUP constants.  Returns BAD_VALUE if
 // grp is out of range, else another non-zero value with errno set if
 // the operation failed.  Thread ID zero means current thread.
 extern int androidSetThreadSchedulingGroup(pid_t tid, int grp);
 // Change the priority AND scheduling group of a particular thread.  The priority
 // should be one of the ANDROID_PRIORITY constants.  Returns INVALID_OPERATION
 // if the priority set failed, else another value if just the group set failed;
 // in either case errno is set.  Thread ID zero means current thread.
 extern int androidSetThreadPriority(pid_t tid, int prio);
 // Get the current priority of a particular thread. Returns one of the
 // ANDROID_PRIORITY constants or a negative result in case of error.
 extern int androidGetThreadPriority(pid_t tid);
 // Get the current scheduling group of a particular thread. Normally returns
 // one of the ANDROID_TGROUP constants other than ANDROID_TGROUP_DEFAULT.
 // Returns ANDROID_TGROUP_DEFAULT if no pthread support (e.g. on host) or if
 // scheduling groups are disabled.  Returns INVALID_OPERATION if unexpected error.
 // Thread ID zero means current thread.
 extern int androidGetThreadSchedulingGroup(pid_t tid);
 #ifdef __cplusplus
 }
 #endif
 // ------------------------------------------------------------------
 // C++ API
 #ifdef __cplusplus
 #include <utils/Errors.h>
 #include <utils/RefBase.h>
 #include <utils/Timers.h>
 namespace android {
 typedef android_thread_id_t thread_id_t;
 typedef android_thread_func_t thread_func_t;
 enum {
     PRIORITY_LOWEST         = ANDROID_PRIORITY_LOWEST,
     PRIORITY_BACKGROUND     = ANDROID_PRIORITY_BACKGROUND,
     PRIORITY_NORMAL         = ANDROID_PRIORITY_NORMAL,
     PRIORITY_FOREGROUND     = ANDROID_PRIORITY_FOREGROUND,
     PRIORITY_DISPLAY        = ANDROID_PRIORITY_DISPLAY,
     PRIORITY_URGENT_DISPLAY = ANDROID_PRIORITY_URGENT_DISPLAY,
     PRIORITY_AUDIO          = ANDROID_PRIORITY_AUDIO,
     PRIORITY_URGENT_AUDIO   = ANDROID_PRIORITY_URGENT_AUDIO,
     PRIORITY_HIGHEST        = ANDROID_PRIORITY_HIGHEST,
     PRIORITY_DEFAULT        = ANDROID_PRIORITY_DEFAULT,
     PRIORITY_MORE_FAVORABLE = ANDROID_PRIORITY_MORE_FAVORABLE,
     PRIORITY_LESS_FAVORABLE = ANDROID_PRIORITY_LESS_FAVORABLE,
 };
 // Create and run a new thread.
 inline bool createThread(thread_func_t f, void *a) {
     return androidCreateThread(f, a) ? true : false;
 }
 // Create thread with lots of parameters
 inline bool createThreadEtc(thread_func_t entryFunction,
                             void *userData,
                             const char* threadName = "android:unnamed_thread",
                             int32_t threadPriority = PRIORITY_DEFAULT,
                             size_t threadStackSize = 0,
                             thread_id_t *threadId = 0)
 {
     return androidCreateThreadEtc(entryFunction, userData, threadName,
         threadPriority, threadStackSize, threadId) ? true : false;
 }
 // Get some sort of unique identifier for the current thread.
 inline thread_id_t getThreadId() {
     return androidGetThreadId();
 }
 /*****************************************************************************/
 /*
  * 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 Mutex {
 public:
     enum {
         PRIVATE = 0,
         SHARED = 1
     };
                 Mutex();
                 Mutex(const char* name);
                 Mutex(int type, const char* name = NULL);
                 ~Mutex();
     // lock or unlock the mutex
     status_t    lock();
     void        unlock();
     // lock if possible; returns 0 on success, error otherwise
     status_t    tryLock();
     // Manages the mutex automatically. It'll be locked when Autolock is
     // constructed and released when Autolock goes out of scope.
     class Autolock {
     public:
         inline Autolock(Mutex& mutex) : mLock(mutex)  { mLock.lock(); }
         inline Autolock(Mutex* mutex) : mLock(*mutex) { mLock.lock(); }
         inline ~Autolock() { mLock.unlock(); }
     private:
         Mutex& mLock;
     };
 private:
     friend class Condition;
     // A mutex cannot be copied
                 Mutex(const Mutex&);
     Mutex&      operator = (const Mutex&);
 #if defined(HAVE_PTHREADS)
     pthread_mutex_t mMutex;
 #else
     void    _init();
     void*   mState;
 #endif
 };
 #if defined(HAVE_PTHREADS)
 inline Mutex::Mutex() {
     pthread_mutex_init(&mMutex, NULL);
 }
 inline Mutex::Mutex(const char* name) {
     pthread_mutex_init(&mMutex, NULL);
 }
 inline Mutex::Mutex(int type, 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, NULL);
     }
 }
 inline Mutex::~Mutex() {
     pthread_mutex_destroy(&mMutex);
 }
 inline status_t Mutex::lock() {
     return -pthread_mutex_lock(&mMutex);
 }
 inline void Mutex::unlock() {
     pthread_mutex_unlock(&mMutex);
 }
 inline status_t Mutex::tryLock() {
     return -pthread_mutex_trylock(&mMutex);
 }
 #endif // HAVE_PTHREADS
 /*
  * 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;
 /*****************************************************************************/
 #if defined(HAVE_PTHREADS)
 /*
  * 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 RWLock {
 public:
     enum {
         PRIVATE = 0,
         SHARED = 1
     };
                 RWLock();
                 RWLock(const char* name);
                 RWLock(int type, const char* name = NULL);
                 ~RWLock();
     status_t    readLock();
     status_t    tryReadLock();
     status_t    writeLock();
     status_t    tryWriteLock();
     void        unlock();
     class AutoRLock {
     public:
         inline AutoRLock(RWLock& rwlock) : mLock(rwlock)  { mLock.readLock(); }
         inline ~AutoRLock() { mLock.unlock(); }
     private:
         RWLock& mLock;
     };
     class AutoWLock {
     public:
         inline AutoWLock(RWLock& rwlock) : mLock(rwlock)  { mLock.writeLock(); }
         inline ~AutoWLock() { mLock.unlock(); }
     private:
         RWLock& mLock;
     };
 private:
     // A RWLock cannot be copied
                 RWLock(const RWLock&);
    RWLock&      operator = (const RWLock&);
    pthread_rwlock_t mRWLock;
 };
 inline RWLock::RWLock() {
     pthread_rwlock_init(&mRWLock, NULL);
 }
 inline RWLock::RWLock(const char* name) {
     pthread_rwlock_init(&mRWLock, NULL);
 }
 inline RWLock::RWLock(int type, const char* name) {
     if (type == SHARED) {
         pthread_rwlockattr_t attr;
         pthread_rwlockattr_init(&attr);
         pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
         pthread_rwlock_init(&mRWLock, &attr);
         pthread_rwlockattr_destroy(&attr);
     } else {
         pthread_rwlock_init(&mRWLock, NULL);
     }
 }
 inline RWLock::~RWLock() {
     pthread_rwlock_destroy(&mRWLock);
 }
 inline status_t RWLock::readLock() {
     return -pthread_rwlock_rdlock(&mRWLock);
 }
 inline status_t RWLock::tryReadLock() {
     return -pthread_rwlock_tryrdlock(&mRWLock);
 }
 inline status_t RWLock::writeLock() {
     return -pthread_rwlock_wrlock(&mRWLock);
 }
 inline status_t RWLock::tryWriteLock() {
     return -pthread_rwlock_trywrlock(&mRWLock);
 }
 inline void RWLock::unlock() {
     pthread_rwlock_unlock(&mRWLock);
 }
 #endif // HAVE_PTHREADS
 /*****************************************************************************/
 /*
  * Condition variable class.  The implementation is system-dependent.
  *
  * Condition variables are paired up with mutexes.  Lock the mutex,
  * call wait(), then either re-wait() if things aren't quite what you want,
  * or unlock the mutex and continue.  All threads calling wait() must
  * use the same mutex for a given Condition.
  */
 class Condition {
 public:
     enum {
         PRIVATE = 0,
         SHARED = 1
     };
     Condition();
     Condition(int type);
     ~Condition();
     // Wait on the condition variable.  Lock the mutex before calling.
     status_t wait(Mutex& mutex);
     // same with relative timeout
     status_t waitRelative(Mutex& mutex, nsecs_t reltime);
     // Signal the condition variable, allowing one thread to continue.
     void signal();
     // Signal the condition variable, allowing all threads to continue.
     void broadcast();
 private:
 #if defined(HAVE_PTHREADS)
     pthread_cond_t mCond;
 #else
     void*   mState;
 #endif
 };
 #if defined(HAVE_PTHREADS)
 inline Condition::Condition() {
     pthread_cond_init(&mCond, NULL);
 }
 inline Condition::Condition(int type) {
     if (type == SHARED) {
         pthread_condattr_t attr;
         pthread_condattr_init(&attr);
         pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
         pthread_cond_init(&mCond, &attr);
         pthread_condattr_destroy(&attr);
     } else {
         pthread_cond_init(&mCond, NULL);
     }
 }
 inline Condition::~Condition() {
     pthread_cond_destroy(&mCond);
 }
 inline status_t Condition::wait(Mutex& mutex) {
     return -pthread_cond_wait(&mCond, &mutex.mMutex);
 }
 inline status_t Condition::waitRelative(Mutex& mutex, nsecs_t reltime) {
 #if defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE)
     struct timespec ts;
     ts.tv_sec  = reltime/1000000000;
     ts.tv_nsec = reltime%1000000000;
     return -pthread_cond_timedwait_relative_np(&mCond, &mutex.mMutex, &ts);
 #else // HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE
     struct timespec ts;
 #if defined(HAVE_POSIX_CLOCKS)
     clock_gettime(CLOCK_REALTIME, &ts);
 #else // HAVE_POSIX_CLOCKS
     // we don't support the clocks here.
     struct timeval t;
     gettimeofday(&t, NULL);
     ts.tv_sec = t.tv_sec;
     ts.tv_nsec= t.tv_usec*1000;
 #endif // HAVE_POSIX_CLOCKS
     ts.tv_sec += reltime/1000000000;
     ts.tv_nsec+= reltime%1000000000;
     if (ts.tv_nsec >= 1000000000) {
         ts.tv_nsec -= 1000000000;
         ts.tv_sec  += 1;
     }
     return -pthread_cond_timedwait(&mCond, &mutex.mMutex, &ts);
 #endif // HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE
 }
 inline void Condition::signal() {
     pthread_cond_signal(&mCond);
 }
 inline void Condition::broadcast() {
     pthread_cond_broadcast(&mCond);
 }
 #endif // HAVE_PTHREADS
 /*****************************************************************************/
 /*
  * This is our spiffy thread object!
  */
 class Thread : virtual public RefBase
 {
 public:
     // Create a Thread object, but doesn't create or start the associated
     // thread. See the run() method.
                         Thread(bool canCallJava = true);
     virtual             ~Thread();
     // Start the thread in threadLoop() which needs to be implemented.
     virtual status_t    run(    const char* name = 0,
                                 int32_t priority = PRIORITY_DEFAULT,
                                 size_t stack = 0);
     // Ask this object's thread to exit. This function is asynchronous, when the
     // function returns the thread might still be running. Of course, this
     // function can be called from a different thread.
     virtual void        requestExit();
     // Good place to do one-time initializations
     virtual status_t    readyToRun();
     // Call requestExit() and wait until this object's thread exits.
     // BE VERY CAREFUL of deadlocks. In particular, it would be silly to call
     // this function from this object's thread. Will return WOULD_BLOCK in
     // that case.
             status_t    requestExitAndWait();
     // Wait until this object's thread exits. Returns immediately if not yet running.
     // Do not call from this object's thread; will return WOULD_BLOCK in that case.
             status_t    join();
 protected:
     // exitPending() returns true if requestExit() has been called.
             bool        exitPending() const;
 private:
     // Derived class must implement threadLoop(). The thread starts its life
     // here. There are two ways of using the Thread object:
     // 1) loop: if threadLoop() returns true, it will be called again if
     //          requestExit() wasn't called.
     // 2) once: if threadLoop() returns false, the thread will exit upon return.
     virtual bool        threadLoop() = 0;
 private:
     Thread& operator=(const Thread&);
     static  int             _threadLoop(void* user);
     const   bool            mCanCallJava;
     // always hold mLock when reading or writing
             thread_id_t     mThread;
     mutable Mutex           mLock;
             Condition       mThreadExitedCondition;
             status_t        mStatus;
     // note that all accesses of mExitPending and mRunning need to hold mLock
     volatile bool           mExitPending;
     volatile bool           mRunning;
             sp<Thread>      mHoldSelf;
 #if HAVE_ANDROID_OS
             int             mTid;
 #endif
 };
 }; // namespace android
 #endif  // __cplusplus
 #endif // _LIBS_UTILS_THREADS_H

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media/omx-plugin/include/ics/utils/threads.h@b8a032363ba2 (annotated)

media/omx-plugin/include/ics/utils/threads.h