threads.c

video linux conference

    if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
        || p_condvar->i_win9x_cv == 0 )
    {
        /* Create an auto-reset event. */
        p_condvar->event = CreateEvent( NULL,   /* no security */
                                        FALSE,  /* auto-reset event */
                                        FALSE,  /* start non-signaled */
                                        NULL ); /* unnamed */

        p_condvar->semaphore = NULL;
        return !p_condvar->event;
    }
    else
    {
        p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
                                                0,          /* initial count */
                                                0x7fffffff, /* max count */
                                                NULL );     /* unnamed */

        if( p_condvar->i_win9x_cv == 1 )
            /* Create a manual-reset event initially signaled. */
            p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
        else
            /* Create a auto-reset event. */
            p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );

        InitializeCriticalSection( &p_condvar->csection );

        return !p_condvar->semaphore || !p_condvar->event;
    }

#elif defined( HAVE_KERNEL_SCHEDULER_H )
    if( !p_condvar )
    {
        return B_BAD_VALUE;
    }

    if( p_condvar->init == 9999 )
    {
        return EALREADY;
    }

    p_condvar->thread = -1;
    p_condvar->init = 9999;
    return 0;

#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
    return pthread_cond_init( &p_condvar->cond, NULL );

#elif defined( HAVE_CTHREADS_H )
    /* condition_init() */
    spin_lock_init( &p_condvar->lock );
    cthread_queue_init( &p_condvar->queue );
    p_condvar->name = 0;
    p_condvar->implications = 0;

    return 0;

#endif
}

/*****************************************************************************
 * vlc_cond_destroy: destroy a condition, inner version
 *****************************************************************************/
int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
{
    int i_result;
    /* In case of error : */
    int i_thread = -1;
    const char * psz_error = "";

#if defined( PTH_INIT_IN_PTH_H )
    return 0;

#elif defined( ST_INIT_IN_ST_H )
    i_result = st_cond_destroy( p_condvar->cond );

#elif defined( UNDER_CE )
    i_result = !CloseHandle( p_condvar->event );

#elif defined( WIN32 )
    if( !p_condvar->semaphore )
        i_result = !CloseHandle( p_condvar->event );
    else
        i_result = !CloseHandle( p_condvar->event )
          || !CloseHandle( p_condvar->semaphore );

#elif defined( HAVE_KERNEL_SCHEDULER_H )
    p_condvar->init = 0;
    return 0;

#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
    i_result = pthread_cond_destroy( &p_condvar->cond );
    if ( i_result )
    {
        i_thread = (int)pthread_self();
        psz_error = strerror(i_result);
    }

#elif defined( HAVE_CTHREADS_H )
    return 0;

#endif

    if( i_result )
    {
        msg_Err( p_condvar->p_this,
                 "thread %d: cond_destroy failed at %s:%d (%d:%s)",
                 i_thread, psz_file, i_line, i_result, psz_error );
    }
    return i_result;
}

/*****************************************************************************
 * vlc_thread_create: create a thread, inner version
 *****************************************************************************
 * Note that i_priority is only taken into account on platforms supporting
 * userland real-time priority threads.
 *****************************************************************************/
int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
                         char *psz_name, void * ( *func ) ( void * ),
                         int i_priority, vlc_bool_t b_wait )
{
    int i_ret;
    void *p_data = (void *)p_this;

    vlc_mutex_lock( &p_this->object_lock );

#if defined( PTH_INIT_IN_PTH_H )
    p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
    i_ret = p_this->thread_id == NULL;

#elif defined( ST_INIT_IN_ST_H )
    p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
    i_ret = 0;

#elif defined( WIN32 ) || defined( UNDER_CE )
    {
        unsigned threadID;
        /* When using the MSVCRT C library you have to use the _beginthreadex
         * function instead of CreateThread, otherwise you'll end up with
         * memory leaks and the signal functions not working (see Microsoft
         * Knowledge Base, article 104641) */
        p_this->thread_id =
#if defined( UNDER_CE )
                (HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
                                      p_data, 0, &threadID );
#else
                (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
                                        p_data, 0, &threadID );
#endif
    }

    if ( p_this->thread_id && i_priority )
    {
        if ( !SetThreadPriority(p_this->thread_id, i_priority) )
        {
            msg_Warn( p_this, "couldn't set a faster priority" );
            i_priority = 0;
        }
    }

    i_ret = ( p_this->thread_id ? 0 : 1 );

#elif defined( HAVE_KERNEL_SCHEDULER_H )
    p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
                                      i_priority, p_data );
    i_ret = resume_thread( p_this->thread_id );

#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
    i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );

#ifndef SYS_DARWIN
    if ( config_GetInt( p_this, "rt-priority" ) )
#endif
    {
        int i_error, i_policy;
        struct sched_param param;

        memset( &param, 0, sizeof(struct sched_param) );
        i_priority += config_GetInt( p_this, "rt-offset" );
        if ( i_priority <= 0 )
        {
            param.sched_priority = (-1) * i_priority;
            i_policy = SCHED_OTHER;
        }
        else
        {
            param.sched_priority = i_priority;
            i_policy = SCHED_RR;
        }
        if ( (i_error = pthread_setschedparam( p_this->thread_id,
                                               i_policy, &param )) )
        {
            msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
                      psz_file, i_line, strerror(i_error) );
            i_priority = 0;
        }
    }
#ifndef SYS_DARWIN
    else
    {
        i_priority = 0;
    }
#endif

#elif defined( HAVE_CTHREADS_H )
    p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
    i_ret = 0;

#endif

    if( i_ret == 0 )
    {
        if( b_wait )
        {
            msg_Dbg( p_this, "waiting for thread completion" );
            vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
        }

        p_this->b_thread = 1;

        msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
                 (unsigned int)p_this->thread_id, psz_name, i_priority,
                 psz_file, i_line );

        vlc_mutex_unlock( &p_this->object_lock );
    }
    else
    {
#ifdef HAVE_STRERROR
        msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
                         psz_name, psz_file, i_line, strerror(i_ret) );
#else
        msg_Err( p_this, "%s thread could not be created at %s:%d",
                         psz_name, psz_file, i_line );
#endif
        vlc_mutex_unlock( &p_this->object_lock );
    }

    return i_ret;
}

/*****************************************************************************
 * vlc_thread_set_priority: set the priority of the current thread when we
 * couldn't set it in vlc_thread_create (for instance for the main thread)
 *****************************************************************************/
int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
                               int i_line, int i_priority )
{
#if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
#elif defined( WIN32 ) || defined( UNDER_CE )
    if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
    {
        msg_Warn( p_this, "couldn't set a faster priority" );
        return 1;
    }

#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
#ifndef SYS_DARWIN
    if ( config_GetInt( p_this, "rt-priority" ) )
#endif
    {
        int i_error, i_policy;
        struct sched_param param;

        memset( &param, 0, sizeof(struct sched_param) );
        i_priority += config_GetInt( p_this, "rt-offset" );
        if ( i_priority <= 0 )
        {
            param.sched_priority = (-1) * i_priority;
            i_policy = SCHED_OTHER;
        }
        else
        {
            param.sched_priority = i_priority;
            i_policy = SCHED_RR;
        }
        if ( !p_this->thread_id )
            p_this->thread_id = pthread_self();
        if ( (i_error = pthread_setschedparam( p_this->thread_id,
                                               i_policy, &param )) )
        {
            msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
                      psz_file, i_line, strerror(i_error) );
            i_priority = 0;
        }
    }
#endif

    return 0;
}

/*****************************************************************************
 * vlc_thread_ready: tell the parent thread we were successfully spawned
 *****************************************************************************/
void __vlc_thread_ready( vlc_object_t *p_this )
{
    vlc_mutex_lock( &p_this->object_lock );
    vlc_cond_signal( &p_this->object_wait );
    vlc_mutex_unlock( &p_this->object_lock );
}

/*****************************************************************************
 * vlc_thread_join: wait until a thread exits, inner version
 *****************************************************************************/
void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
{
    int i_ret = 0;

#if defined( PTH_INIT_IN_PTH_H )
    i_ret = ( pth_join( p_this->thread_id, NULL ) == FALSE );

#elif defined( ST_INIT_IN_ST_H )
    i_ret = st_thread_join( p_this->thread_id, NULL );

#elif defined( UNDER_CE ) || defined( WIN32 )
    HMODULE hmodule;
    BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
                                      FILETIME*, FILETIME* );
    FILETIME create_ft, exit_ft, kernel_ft, user_ft;
    int64_t real_time, kernel_time, user_time;

    WaitForSingleObject( p_this->thread_id, INFINITE );

#if defined( UNDER_CE )
    hmodule = GetModuleHandle( _T("COREDLL") );
#else
    hmodule = GetModuleHandle( _T("KERNEL32") );
#endif
    OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
                                         FILETIME*, FILETIME* ))
        GetProcAddress( hmodule, _T("GetThreadTimes") );

    if( OurGetThreadTimes &&
        OurGetThreadTimes( p_this->thread_id,
                           &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
    {
        real_time =
          ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
          ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
        real_time /= 10;

        kernel_time =
          ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
           kernel_ft.dwLowDateTime) / 10;

        user_time =
          ((((int64_t)user_ft.dwHighDateTime)<<32)|
           user_ft.dwLowDateTime) / 10;

        msg_Dbg( p_this, "thread times: "
                 "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
                 real_time/60/1000000,
                 (double)((real_time%(60*1000000))/1000000.0),
                 kernel_time/60/1000000,
                 (double)((kernel_time%(60*1000000))/1000000.0),
                 user_time/60/1000000,
                 (double)((user_time%(60*1000000))/1000000.0) );
    }
    CloseHandle( p_this->thread_id );

#elif defined( HAVE_KERNEL_SCHEDULER_H )
    int32_t exit_value;
    wait_for_thread( p_this->thread_id, &exit_value );

#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
    i_ret = pthread_join( p_this->thread_id, NULL );

#elif defined( HAVE_CTHREADS_H )
    cthread_join( p_this->thread_id );
    i_ret = 1;

#endif

    if( i_ret )
    {
#ifdef HAVE_STRERROR
        msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
                         (unsigned int)p_this->thread_id, psz_file, i_line,
                         strerror(i_ret) );
#else
        msg_Err( p_this, "thread_join(%u) failed at %s:%d",
                         (unsigned int)p_this->thread_id, psz_file, i_line );
#endif
    }
    else
    {
        msg_Dbg( p_this, "thread %u joined (%s:%d)",
                         (unsigned int)p_this->thread_id, psz_file, i_line );
    }

    p_this->b_thread = 0;
}