The mutex for Android analytics

The Android Lock is a wrapper for the Linux lock:

---------------------------------------------------------------------------namespace Android {//--------------  -------------------------------------------------------------class condition;/* * Simple Mutex class. The implementation is system-dependent.  * The mutex must is unlocked by the thread that locked it. They is not * recursive, i.e. the same thread can ' t lock it multiple times.                    */class Mutex {public:enum {PRIVATE = 0,//This lock is used within this process using SHARED = 1//The lock is used across processes};                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 was//constructed and released when Autolock goes out of scope. Class Autolock {//internal class, used to manage mutexes--equivalent to "smart pointer" publIc:inline Autolock (mutex& Mutex): MLock (Mutex) {Mlock.lock ();}        Inline Autolock (mutex* Mutex): MLock (*mutex) {Mlock.lock ();}    Inline ~autolock () {Mlock.unlock ();}        private:mutex& mlock;//holds a reference to a mutex};p Rivate:friend class condition;//friend, Condition is used on the basis of a mutex A mutex cannot be copied mutex (const mutex&);//set to private, unable to invoke "copy constructor" mutex& operator = (con    St mutex&);    #if defined (have_pthreads) pthread_mutex_t mmutex;//uses the Linux pthread_mutex_t this mutex #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) {//if branch: Determines whether to construct a "cross-process" lock based on the value passed in Pthread_mute        xattr_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);//if branch: Lock}}inline in this process 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'll go out of scope, and release the * mutex. */typedef mutex::autolock AUTOMUTEX;//-------------------------------------------------------------------------- -};　　 Namespace Android

　　

The mutex for Android analytics