X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Fvlc_threads_funcs.h;h=7add0dcc66cd69b45675e45ee751c35fafc76607;hb=a21959aff9fc4595d6d82867447889ee2c862b40;hp=88c0d5eede027ae52018c1a70577398025fe5876;hpb=2c5dbee651298b3a8d8538a2f1415f78e4f25a84;p=vlc diff --git a/include/vlc_threads_funcs.h b/include/vlc_threads_funcs.h index 88c0d5eede..7add0dcc66 100644 --- a/include/vlc_threads_funcs.h +++ b/include/vlc_threads_funcs.h @@ -32,27 +32,24 @@ #ifndef _VLC_THREADFUNCS_H_ #define _VLC_THREADFUNCS_H_ +#if defined( WIN32 ) && !defined ETIMEDOUT +# define ETIMEDOUT 10060 /* This is the value in winsock.h. */ +#endif + /***************************************************************************** * Function definitions *****************************************************************************/ -VLC_EXPORT( void, __vlc_threads_error, ( vlc_object_t *) ); -VLC_EXPORT( int, __vlc_mutex_init, ( vlc_object_t *, vlc_mutex_t * ) ); -VLC_EXPORT( int, __vlc_mutex_init_recursive, ( vlc_object_t *, vlc_mutex_t * ) ); -VLC_EXPORT( int, __vlc_mutex_destroy, ( const char *, int, vlc_mutex_t * ) ); -VLC_EXPORT( int, __vlc_cond_init, ( vlc_object_t *, vlc_cond_t * ) ); -VLC_EXPORT( int, __vlc_cond_destroy, ( const char *, int, vlc_cond_t * ) ); -VLC_EXPORT( int, __vlc_threadvar_create, (vlc_object_t *, vlc_threadvar_t * ) ); +VLC_EXPORT( int, __vlc_mutex_init, ( vlc_mutex_t * ) ); +VLC_EXPORT( int, __vlc_mutex_init_recursive, ( vlc_mutex_t * ) ); +VLC_EXPORT( void, __vlc_mutex_destroy, ( const char *, int, vlc_mutex_t * ) ); +VLC_EXPORT( int, __vlc_cond_init, ( vlc_cond_t * ) ); +VLC_EXPORT( void, __vlc_cond_destroy, ( const char *, int, vlc_cond_t * ) ); +VLC_EXPORT( int, __vlc_threadvar_create, (vlc_threadvar_t * ) ); VLC_EXPORT( int, __vlc_thread_create, ( vlc_object_t *, const char *, int, const char *, void * ( * ) ( void * ), int, vlc_bool_t ) ); VLC_EXPORT( int, __vlc_thread_set_priority, ( vlc_object_t *, const char *, int, int ) ); VLC_EXPORT( void, __vlc_thread_ready, ( vlc_object_t * ) ); VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, const char *, int ) ); -/***************************************************************************** - * vlc_threads_error: Signalize an error in the threading system - *****************************************************************************/ -#define vlc_threads_error( P_THIS ) \ - __vlc_threads_error( VLC_OBJECT(P_THIS) ) - /***************************************************************************** * vlc_threads_init: initialize threads system *****************************************************************************/ @@ -69,13 +66,13 @@ VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, const char *, int ) ); * vlc_mutex_init: initialize a mutex *****************************************************************************/ #define vlc_mutex_init( P_THIS, P_MUTEX ) \ - __vlc_mutex_init( VLC_OBJECT(P_THIS), P_MUTEX ) + __vlc_mutex_init( P_MUTEX ) /***************************************************************************** * vlc_mutex_init: initialize a recursive mutex (Don't use it) *****************************************************************************/ #define vlc_mutex_init_recursive( P_THIS, P_MUTEX ) \ - __vlc_mutex_init_recursive( VLC_OBJECT(P_THIS), P_MUTEX ) + __vlc_mutex_init_recursive( P_MUTEX ) /***************************************************************************** * vlc_mutex_lock: lock a mutex @@ -83,82 +80,42 @@ VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, const char *, int ) ); #define vlc_mutex_lock( P_MUTEX ) \ __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX ) -#if defined( PTHREAD_COND_T_IN_PTHREAD_H ) -static inline unsigned long int CAST_PTHREAD_TO_INT (pthread_t th) -{ - union { pthread_t th; unsigned long int i; } v = { }; - v.th = th; - return v.i; -} +#if defined(LIBVLC_USE_PTHREAD) +VLC_EXPORT(void, vlc_pthread_fatal, (const char *action, int error, const char *file, unsigned line)); + +# define VLC_THREAD_ASSERT( action ) \ + if (val) \ + vlc_pthread_fatal (action, val, psz_file, i_line) +#else +# define VLC_THREAD_ASSERT (void)0 #endif -static inline int __vlc_mutex_lock( const char * psz_file, int i_line, +static inline void __vlc_mutex_lock( const char * psz_file, int i_line, vlc_mutex_t * p_mutex ) { - int i_result; - /* In case of error : */ - unsigned long int i_thread = 0; - -#if defined( PTH_INIT_IN_PTH_H ) - i_result = ( pth_mutex_acquire( &p_mutex->mutex, FALSE, NULL ) == FALSE ); - -#elif defined( ST_INIT_IN_ST_H ) - i_result = st_mutex_lock( p_mutex->mutex ); +#if defined( UNDER_CE ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); -#elif defined( UNDER_CE ) EnterCriticalSection( &p_mutex->csection ); - i_result = 0; #elif defined( WIN32 ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); + if( p_mutex->mutex ) - { WaitForSingleObject( p_mutex->mutex, INFINITE ); - } else - { EnterCriticalSection( &p_mutex->csection ); - } - i_result = 0; #elif defined( HAVE_KERNEL_SCHEDULER_H ) - if( p_mutex == NULL ) - { - i_result = B_BAD_VALUE; - } - else if( p_mutex->init < 2000 ) - { - i_result = B_NO_INIT; - } - else - { - i_result = acquire_sem( p_mutex->lock ); - } + acquire_sem( p_mutex->lock ); -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) +#elif defined(LIBVLC_USE_PTHREAD) # define vlc_assert_locked( m ) \ assert (pthread_mutex_lock (&((m)->mutex)) == EDEADLK) - - i_result = pthread_mutex_lock( &p_mutex->mutex ); - if ( i_result ) - { - i_thread = CAST_PTHREAD_TO_INT(pthread_self()); - errno = i_result; - } - -#elif defined( HAVE_CTHREADS_H ) - mutex_lock( p_mutex->mutex ); - i_result = 0; + int val = pthread_mutex_lock( &p_mutex->mutex ); + VLC_THREAD_ASSERT ("locking mutex"); #endif - - if( i_result ) - { - msg_Err( p_mutex->p_this, - "thread %li: mutex_lock failed at %s:%d (%d:%m)", - i_thread, psz_file, i_line, i_result ); - vlc_threads_error( p_mutex->p_this ); - } - return i_result; } #ifndef vlc_assert_locked @@ -171,72 +128,30 @@ static inline int __vlc_mutex_lock( const char * psz_file, int i_line, #define vlc_mutex_unlock( P_MUTEX ) \ __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX ) -static inline int __vlc_mutex_unlock( const char * psz_file, int i_line, +static inline void __vlc_mutex_unlock( const char * psz_file, int i_line, vlc_mutex_t *p_mutex ) { - int i_result; - /* In case of error : */ - unsigned long int i_thread = 0; - -#if defined( PTH_INIT_IN_PTH_H ) - i_result = ( pth_mutex_release( &p_mutex->mutex ) == FALSE ); +#if defined( UNDER_CE ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); -#elif defined( ST_INIT_IN_ST_H ) - i_result = st_mutex_unlock( p_mutex->mutex ); - -#elif defined( UNDER_CE ) LeaveCriticalSection( &p_mutex->csection ); - i_result = 0; #elif defined( WIN32 ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); + if( p_mutex->mutex ) - { ReleaseMutex( p_mutex->mutex ); - } else - { LeaveCriticalSection( &p_mutex->csection ); - } - i_result = 0; #elif defined( HAVE_KERNEL_SCHEDULER_H ) - if( p_mutex == NULL ) - { - i_result = B_BAD_VALUE; - } - else if( p_mutex->init < 2000 ) - { - i_result = B_NO_INIT; - } - else - { - release_sem( p_mutex->lock ); - return B_OK; - } - -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) - i_result = pthread_mutex_unlock( &p_mutex->mutex ); - if ( i_result ) - { - i_thread = CAST_PTHREAD_TO_INT(pthread_self()); - errno = i_result; - } + release_sem( p_mutex->lock ); -#elif defined( HAVE_CTHREADS_H ) - mutex_unlock( p_mutex ); - i_result = 0; +#elif defined(LIBVLC_USE_PTHREAD) + int val = pthread_mutex_unlock( &p_mutex->mutex ); + VLC_THREAD_ASSERT ("unlocking mutex"); #endif - - if( i_result ) - { - msg_Err( p_mutex->p_this, - "thread %li: mutex_unlock failed at %s:%d (%d:%m)", - i_thread, psz_file, i_line, i_result ); - vlc_threads_error( p_mutex->p_this ); - } - - return i_result; } /***************************************************************************** @@ -249,7 +164,7 @@ static inline int __vlc_mutex_unlock( const char * psz_file, int i_line, * vlc_cond_init: initialize a condition *****************************************************************************/ #define vlc_cond_init( P_THIS, P_COND ) \ - __vlc_cond_init( VLC_OBJECT(P_THIS), P_COND ) + __vlc_cond_init( P_COND ) /***************************************************************************** * vlc_cond_signal: start a thread on condition completion @@ -257,34 +172,25 @@ static inline int __vlc_mutex_unlock( const char * psz_file, int i_line, #define vlc_cond_signal( P_COND ) \ __vlc_cond_signal( __FILE__, __LINE__, P_COND ) -static inline int __vlc_cond_signal( const char * psz_file, int i_line, - vlc_cond_t *p_condvar ) +static inline void __vlc_cond_signal( const char * psz_file, int i_line, + vlc_cond_t *p_condvar ) { - int i_result; - /* In case of error : */ - unsigned long int i_thread = 0; - -#if defined( PTH_INIT_IN_PTH_H ) - i_result = ( pth_cond_notify( &p_condvar->cond, FALSE ) == FALSE ); - -#elif defined( ST_INIT_IN_ST_H ) - i_result = st_cond_signal( p_condvar->cond ); +#if defined( UNDER_CE ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); -#elif defined( UNDER_CE ) PulseEvent( p_condvar->event ); - i_result = 0; #elif defined( WIN32 ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); + /* Release one waiting thread if one is available. */ /* For this trick to work properly, the vlc_cond_signal must be surrounded * by a mutex. This will prevent another thread from stealing the signal */ if( !p_condvar->semaphore ) { - /* - ** PulseEvent() only works if none of the waiting threads is suspended. - ** this is particularily problematic under a debug session. - ** as documented in http://support.microsoft.com/kb/q173260/ - */ + /* PulseEvent() only works if none of the waiting threads is suspended. + * This is particularily problematic under a debug session. + * as documented in http://support.microsoft.com/kb/q173260/ */ PulseEvent( p_condvar->event ); } else if( p_condvar->i_win9x_cv == 1 ) @@ -318,72 +224,34 @@ static inline int __vlc_cond_signal( const char * psz_file, int i_line, WaitForSingleObject( p_condvar->event, INFINITE ); } } - i_result = 0; #elif defined( HAVE_KERNEL_SCHEDULER_H ) - if( p_condvar == NULL ) - { - i_result = B_BAD_VALUE; - } - else if( p_condvar->init < 2000 ) - { - i_result = B_NO_INIT; - } - else + while( p_condvar->thread != -1 ) { - while( p_condvar->thread != -1 ) + thread_info info; + if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE ) + return; + + if( info.state != B_THREAD_SUSPENDED ) { - thread_info info; - if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE ) - { - return 0; - } - - if( info.state != B_THREAD_SUSPENDED ) - { - /* The waiting thread is not suspended so it could - * have been interrupted beetwen the unlock and the - * suspend_thread line. That is why we sleep a little - * before retesting p_condver->thread. */ - snooze( 10000 ); - } - else - { - /* Ok, we have to wake up that thread */ - resume_thread( p_condvar->thread ); - return 0; - } + /* The waiting thread is not suspended so it could + * have been interrupted beetwen the unlock and the + * suspend_thread line. That is why we sleep a little + * before retesting p_condver->thread. */ + snooze( 10000 ); + } + else + { + /* Ok, we have to wake up that thread */ + resume_thread( p_condvar->thread ); } - i_result = 0; - } - -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) - i_result = pthread_cond_signal( &p_condvar->cond ); - if ( i_result ) - { - i_thread = CAST_PTHREAD_TO_INT(pthread_self()); - errno = i_result; } -#elif defined( HAVE_CTHREADS_H ) - /* condition_signal() */ - if ( p_condvar->queue.head || p_condvar->implications ) - { - cond_signal( (condition_t)p_condvar ); - } - i_result = 0; +#elif defined(LIBVLC_USE_PTHREAD) + int val = pthread_cond_signal( &p_condvar->cond ); + VLC_THREAD_ASSERT ("signaling condition variable"); #endif - - if( i_result ) - { - msg_Err( p_condvar->p_this, - "thread %li: cond_signal failed at %s:%d (%d:%m)", - i_thread, psz_file, i_line, i_result ); - vlc_threads_error( p_condvar->p_this ); - } - - return i_result; } /***************************************************************************** @@ -392,23 +260,10 @@ static inline int __vlc_cond_signal( const char * psz_file, int i_line, #define vlc_cond_wait( P_COND, P_MUTEX ) \ __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX ) -static inline int __vlc_cond_wait( const char * psz_file, int i_line, - vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex ) +static inline void __vlc_cond_wait( const char * psz_file, int i_line, + vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex ) { - int i_result; - /* In case of error : */ - unsigned long int i_thread = 0; - -#if defined( PTH_INIT_IN_PTH_H ) - i_result = ( pth_cond_await( &p_condvar->cond, &p_mutex->mutex, NULL ) - == FALSE ); - -#elif defined( ST_INIT_IN_ST_H ) - st_mutex_unlock( p_mutex->mutex ); - i_result = st_cond_wait( p_condvar->cond ); - st_mutex_lock( p_mutex->mutex ); - -#elif defined( UNDER_CE ) +#if defined( UNDER_CE ) p_condvar->i_waiting_threads++; LeaveCriticalSection( &p_mutex->csection ); WaitForSingleObject( p_condvar->event, INFINITE ); @@ -417,9 +272,9 @@ static inline int __vlc_cond_wait( const char * psz_file, int i_line, /* Reacquire the mutex before returning. */ vlc_mutex_lock( p_mutex ); - i_result = 0; - #elif defined( WIN32 ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); + if( !p_condvar->semaphore ) { /* Increase our wait count */ @@ -493,22 +348,7 @@ static inline int __vlc_cond_wait( const char * psz_file, int i_line, /* Reacquire the mutex before returning. */ vlc_mutex_lock( p_mutex ); - i_result = 0; - #elif defined( HAVE_KERNEL_SCHEDULER_H ) - if( p_condvar == NULL ) - { - i_result = B_BAD_VALUE; - } - else if( p_mutex == NULL ) - { - i_result = B_BAD_VALUE; - } - else if( p_condvar->init < 2000 ) - { - i_result = B_NO_INIT; - } - /* The p_condvar->thread var is initialized before the unlock because * it enables to identify when the thread is interrupted beetwen the * unlock line and the suspend_thread line */ @@ -518,56 +358,12 @@ static inline int __vlc_cond_wait( const char * psz_file, int i_line, p_condvar->thread = -1; vlc_mutex_lock( p_mutex ); - i_result = 0; - -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) -# ifdef DEBUG - /* In debug mode, timeout */ - struct timespec timeout = { - (mdate() / 1000000) + THREAD_COND_TIMEOUT, - 0 /* 1Hz precision is sufficient here :-) */ - }; - - i_result = pthread_cond_timedwait( &p_condvar->cond, &p_mutex->mutex, - &timeout ); - - if( i_result == ETIMEDOUT ) - { - errno = ETIMEDOUT; - msg_Dbg( p_condvar->p_this, - "thread %li: possible condition deadlock " - "at %s:%d (%m)", CAST_PTHREAD_TO_INT(pthread_self()), - psz_file, i_line ); - - i_result = pthread_cond_wait( &p_condvar->cond, &p_mutex->mutex ); - } - -# else - i_result = pthread_cond_wait( &p_condvar->cond, &p_mutex->mutex ); -# endif - - if ( i_result ) - { - i_thread = CAST_PTHREAD_TO_INT(pthread_self()); - errno = i_result; - } - -#elif defined( HAVE_CTHREADS_H ) - condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex ); - i_result = 0; +#elif defined(LIBVLC_USE_PTHREAD) + int val = pthread_cond_wait( &p_condvar->cond, &p_mutex->mutex ); + VLC_THREAD_ASSERT ("waiting on condition"); #endif - - if( i_result ) - { - msg_Err( p_condvar->p_this, - "thread %li: cond_wait failed at %s:%d (%d:%m)", - i_thread, psz_file, i_line, i_result ); - vlc_threads_error( p_condvar->p_this ); - } - - return i_result; } @@ -584,14 +380,7 @@ static inline int __vlc_cond_timedwait( const char * psz_file, int i_line, vlc_mutex_t *p_mutex, mtime_t deadline ) { - int i_res; - unsigned long int i_thread = 0; - -#if defined( PTH_INIT_IN_PTH_H ) -# error Unimplemented -#elif defined( ST_INIT_IN_ST_H ) -# error Unimplemented -#elif defined( UNDER_CE ) +#if defined( UNDER_CE ) mtime_t delay_ms = (deadline - mdate())/1000; DWORD result; @@ -606,11 +395,12 @@ static inline int __vlc_cond_timedwait( const char * psz_file, int i_line, /* Reacquire the mutex before returning. */ vlc_mutex_lock( p_mutex ); - i_res = (int)result; if(result == WAIT_TIMEOUT) - return WAIT_TIMEOUT; /* this error is perfectly normal */ + return ETIMEDOUT; /* this error is perfectly normal */ #elif defined( WIN32 ) + VLC_UNUSED( psz_file); VLC_UNUSED( i_line ); + DWORD result; mtime_t delay_ms = (deadline - mdate())/1000; @@ -698,39 +488,23 @@ static inline int __vlc_cond_timedwait( const char * psz_file, int i_line, /* Reacquire the mutex before returning. */ vlc_mutex_lock( p_mutex ); if(result == WAIT_TIMEOUT) - return WAIT_TIMEOUT; /* this error is perfectly normal */ - - i_res = (int)result; + return ETIMEDOUT; /* this error is perfectly normal */ #elif defined( HAVE_KERNEL_SCHEDULER_H ) # error Unimplemented -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) + +#elif defined(LIBVLC_USE_PTHREAD) lldiv_t d = lldiv( deadline, 1000000 ); struct timespec ts = { d.quot, d.rem * 1000 }; - i_res = pthread_cond_timedwait( &p_condvar->cond, &p_mutex->mutex, &ts ); - if( i_res == ETIMEDOUT ) + int val = pthread_cond_timedwait (&p_condvar->cond, &p_mutex->mutex, &ts); + if (val == ETIMEDOUT) return ETIMEDOUT; /* this error is perfectly normal */ - else - if ( i_res ) /* other errors = bug */ - { - i_thread = CAST_PTHREAD_TO_INT(pthread_self()); - errno = i_res; - } + VLC_THREAD_ASSERT ("timed-waiting on condition"); -#elif defined( HAVE_CTHREADS_H ) -# error Unimplemented #endif - if( i_res ) - { - msg_Err( p_condvar->p_this, - "thread %li: cond_wait failed at %s:%d (%d:%m)", - i_thread, psz_file, i_line, i_res ); - vlc_threads_error( p_condvar->p_this ); - } - - return i_res; + return 0; } /***************************************************************************** @@ -743,7 +517,7 @@ static inline int __vlc_cond_timedwait( const char * psz_file, int i_line, * vlc_threadvar_create: create a thread-local variable *****************************************************************************/ #define vlc_threadvar_create( PTHIS, P_TLS ) \ - __vlc_threadvar_create( PTHIS, P_TLS ) + __vlc_threadvar_create( P_TLS ) /***************************************************************************** * vlc_threadvar_set: create: set the value of a thread-local variable @@ -752,21 +526,15 @@ static inline int vlc_threadvar_set( vlc_threadvar_t * p_tls, void *p_value ) { int i_ret; -#if defined( PTH_INIT_IN_PTH_H ) - return pth_key_setdata( p_tls->handle, p_value ); -#elif defined( ST_INIT_IN_ST_H ) - return st_thread_setspecific( p_tls->handle, p_value ); -#elif defined( HAVE_KERNEL_SCHEDULER_H ) +#if defined( HAVE_KERNEL_SCHEDULER_H ) return -1; #elif defined( UNDER_CE ) || defined( WIN32 ) i_ret = ( TlsSetValue( p_tls->handle, p_value ) != 0 ); -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) +#elif defined(LIBVLC_USE_PTHREAD) i_ret = pthread_setspecific( p_tls->handle, p_value ); -#elif defined( HAVE_CTHREADS_H ) - i_ret = cthread_setspecific( p_tls->handle, p_value ); #endif return i_ret; @@ -779,28 +547,112 @@ static inline void* vlc_threadvar_get( vlc_threadvar_t * p_tls ) { void* p_ret; -#if defined( PTH_INIT_IN_PTH_H ) - p_ret = pth_key_getdata( p_handle->key ); -#elif defined( ST_INIT_IN_ST_H ) - p_ret = st_thread_getspecific( p_handle->key ); -#elif defined( HAVE_KERNEL_SCHEDULER_H ) +#if defined( HAVE_KERNEL_SCHEDULER_H ) p_ret = NULL; #elif defined( UNDER_CE ) || defined( WIN32 ) p_ret = TlsGetValue( p_tls->handle ); -#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) +#elif defined(LIBVLC_USE_PTHREAD) p_ret = pthread_getspecific( p_tls->handle ); -#elif defined( HAVE_CTHREADS_H ) - if ( !cthread_getspecific( p_tls->handle, &p_ret ) ) - { - p_ret = NULL; - } #endif return p_ret; } +# if defined (_POSIX_SPIN_LOCKS) && ((_POSIX_SPIN_LOCKS - 0) > 0) +typedef struct +{ + pthread_spinlock_t spin; +} vlc_spinlock_t; + +/** + * Initializes a spinlock. + */ +static inline int vlc_spin_init (vlc_spinlock_t *spin) +{ + return pthread_spin_init (&spin->spin, PTHREAD_PROCESS_PRIVATE); +} + +/** + * Acquires a spinlock. + */ +static inline void vlc_spin_lock (vlc_spinlock_t *spin) +{ + int val = pthread_spin_lock (&spin->spin); + assert (val == 0); +} + +/** + * Releases a spinlock. + */ +static inline void vlc_spin_unlock (vlc_spinlock_t *spin) +{ + int val = pthread_spin_unlock (&spin->spin); + assert (val == 0); +} + +/** + * Deinitializes a spinlock. + */ +static inline void vlc_spin_destroy (vlc_spinlock_t *spin) +{ + int val = pthread_spin_destroy (&spin->spin); + assert (val == 0); +} + +#elif defined( WIN32 ) + +typedef CRITICAL_SECTION vlc_spinlock_t; + +/** + * Initializes a spinlock. + */ +static inline int vlc_spin_init (vlc_spinlock_t *spin) +{ + return !InitializeCriticalSectionAndSpinCount(spin, 4000); +} + +/** + * Acquires a spinlock. + */ +static inline void vlc_spin_lock (vlc_spinlock_t *spin) +{ + EnterCriticalSection(spin); +} + +/** + * Releases a spinlock. + */ +static inline void vlc_spin_unlock (vlc_spinlock_t *spin) +{ + LeaveCriticalSection(spin); +} + +/** + * Deinitializes a spinlock. + */ +static inline void vlc_spin_destroy (vlc_spinlock_t *spin) +{ + DeleteCriticalSection(spin); +} + + +#else + +/* Fallback to plain mutexes if spinlocks are not available */ +typedef vlc_mutex_t vlc_spinlock_t; + +static inline int vlc_spin_init (vlc_spinlock_t *spin) +{ + return __vlc_mutex_init (spin); +} + +# define vlc_spin_lock vlc_mutex_lock +# define vlc_spin_unlock vlc_mutex_unlock +# define vlc_spin_destroy vlc_mutex_destroy +#endif + /***************************************************************************** * vlc_thread_create: create a thread *****************************************************************************/