-
-static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
-#else
-static vlc_threadvar_t cancel_key;
-#endif
-
-/**
- * Global process-wide VLC object.
- * Contains inter-instance data, such as the module cache and global mutexes.
- */
-static libvlc_global_data_t *p_root;
-
-libvlc_global_data_t *vlc_global( void )
-{
- assert( i_initializations > 0 );
- return p_root;
-}
-
-#ifdef HAVE_EXECINFO_H
-# include <execinfo.h>
-#endif
-
-/**
- * Print a backtrace to the standard error for debugging purpose.
- */
-void vlc_trace (const char *fn, const char *file, unsigned line)
-{
- fprintf (stderr, "at %s:%u in %s\n", file, line, fn);
- fflush (stderr); /* needed before switch to low-level I/O */
-#ifdef HAVE_BACKTRACE
- void *stack[20];
- int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
- backtrace_symbols_fd (stack, len, 2);
-#endif
-#ifndef WIN32
- fsync (2);
-#endif
-}
-
-static inline unsigned long vlc_threadid (void)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- union { pthread_t th; unsigned long int i; } v = { };
- v.th = pthread_self ();
- return v.i;
-
-#elif defined (WIN32)
- return GetCurrentThreadId ();
-
-#else
- return 0;
-
-#endif
-}
-
-/*****************************************************************************
- * vlc_thread_fatal: Report an error from the threading layer
- *****************************************************************************
- * This is mostly meant for debugging.
- *****************************************************************************/
-static void
-vlc_thread_fatal (const char *action, int error,
- const char *function, const char *file, unsigned line)
-{
- fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
- action, error, vlc_threadid ());
- vlc_trace (function, file, line);
-
- /* Sometimes strerror_r() crashes too, so make sure we print an error
- * message before we invoke it */
-#ifdef __GLIBC__
- /* Avoid the strerror_r() prototype brain damage in glibc */
- errno = error;
- fprintf (stderr, " Error message: %m at:\n");
-#elif !defined (WIN32)
- char buf[1000];
- const char *msg;
-
- switch (strerror_r (error, buf, sizeof (buf)))
- {
- case 0:
- msg = buf;
- break;
- case ERANGE: /* should never happen */
- msg = "unknwon (too big to display)";
- break;
- default:
- msg = "unknown (invalid error number)";
- break;
- }
- fprintf (stderr, " Error message: %s\n", msg);
-#endif
- fflush (stderr);
-
- abort ();
-}
-
-#ifndef NDEBUG
-# define VLC_THREAD_ASSERT( action ) \
- if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
-#else
-# define VLC_THREAD_ASSERT( action ) ((void)val)
-#endif
-
-/**
- * Per-thread cancellation data
- */
-#ifndef LIBVLC_USE_PTHREAD_CANCEL
-typedef struct vlc_cancel_t
-{
- vlc_cleanup_t *cleaners;
- bool killable;
- bool killed;
-} vlc_cancel_t;
-
-# define VLC_CANCEL_INIT { NULL, true, false }
-#endif
-
-/*****************************************************************************
- * vlc_threads_init: initialize threads system
- *****************************************************************************
- * This function requires lazy initialization of a global lock in order to
- * keep the library really thread-safe. Some architectures don't support this
- * and thus do not guarantee the complete reentrancy.
- *****************************************************************************/
-int vlc_threads_init( void )
-{
- int i_ret = VLC_SUCCESS;
-
- /* If we have lazy mutex initialization, use it. Otherwise, we just
- * hope nothing wrong happens. */
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutex_lock( &once_mutex );
-#endif
-
- if( i_initializations == 0 )
- {
- p_root = vlc_custom_create( (vlc_object_t *)NULL, sizeof( *p_root ),
- VLC_OBJECT_GENERIC, "root" );
- if( p_root == NULL )
- {
- i_ret = VLC_ENOMEM;
- goto out;
- }
-
- /* We should be safe now. Do all the initialization stuff we want. */
-#ifndef LIBVLC_USE_PTHREAD_CANCEL
- vlc_threadvar_create( &cancel_key, free );
-#endif
- }
- i_initializations++;
-
-out:
- /* If we have lazy mutex initialization support, unlock the mutex.
- * Otherwize, we are screwed. */
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutex_unlock( &once_mutex );
-#endif
-
- return i_ret;
-}
-
-/*****************************************************************************
- * vlc_threads_end: stop threads system
- *****************************************************************************
- * FIXME: This function is far from being threadsafe.
- *****************************************************************************/
-void vlc_threads_end( void )
-{
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutex_lock( &once_mutex );
-#endif
-
- assert( i_initializations > 0 );
-
- if( i_initializations == 1 )
- {
- vlc_object_release( p_root );
-#ifndef LIBVLC_USE_PTHREAD
- vlc_threadvar_delete( &cancel_key );
-#endif
- }
- i_initializations--;
-
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutex_unlock( &once_mutex );
-#endif
-}
-
-#if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
-/* This is not prototyped under glibc, though it exists. */
-int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
-#endif
-
-/*****************************************************************************
- * vlc_mutex_init: initialize a mutex
- *****************************************************************************/
-int vlc_mutex_init( vlc_mutex_t *p_mutex )
-{
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutexattr_t attr;
- int i_result;
-
- pthread_mutexattr_init( &attr );
-
-# ifndef NDEBUG
- /* Create error-checking mutex to detect problems more easily. */
-# if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
- pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
-# else
- pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
-# endif
-# endif
- i_result = pthread_mutex_init( p_mutex, &attr );
- pthread_mutexattr_destroy( &attr );
- return i_result;
-
-#elif defined( WIN32 )
- InitializeCriticalSection (&p_mutex->mutex);
- p_mutex->recursive = false;
- return 0;
-
-#endif
-}
-
-/*****************************************************************************
- * vlc_mutex_init: initialize a recursive mutex (Do not use)
- *****************************************************************************/
-int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
-{
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_mutexattr_t attr;
- int i_result;
-
- pthread_mutexattr_init( &attr );
-# if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
- pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
-# else
- pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
-# endif
- i_result = pthread_mutex_init( p_mutex, &attr );
- pthread_mutexattr_destroy( &attr );
- return( i_result );
-
-#elif defined( WIN32 )
- InitializeCriticalSection( &p_mutex->mutex );
- p_mutex->owner = 0; /* the error value for GetThreadId()! */
- p_mutex->recursion = 0;
- p_mutex->recursive = true;
- return 0;
-
-#endif
-}
-
-
-/**
- * Destroys a mutex. The mutex must not be locked.
- *
- * @param p_mutex mutex to destroy
- * @return always succeeds
- */
-void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
-{
-#if defined( LIBVLC_USE_PTHREAD )
- int val = pthread_mutex_destroy( p_mutex );
- VLC_THREAD_ASSERT ("destroying mutex");
-
-#elif defined( WIN32 )
- DeleteCriticalSection (&p_mutex->mutex);
-
-#endif
-}
-
-/**
- * Acquires a mutex. If needed, waits for any other thread to release it.
- * Beware of deadlocks when locking multiple mutexes at the same time,
- * or when using mutexes from callbacks.
- *
- * @param p_mutex mutex initialized with vlc_mutex_init() or
- * vlc_mutex_init_recursive()
- */
-void vlc_mutex_lock (vlc_mutex_t *p_mutex)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- int val = pthread_mutex_lock( p_mutex );
- VLC_THREAD_ASSERT ("locking mutex");
-
-#elif defined( WIN32 )
- if (p_mutex->recursive)
- {
- DWORD self = GetCurrentThreadId ();
-
- if ((DWORD)InterlockedCompareExchange (&p_mutex->owner, self,
- self) == self)
- { /* We already locked this recursive mutex */
- p_mutex->recursion++;
- return;
- }
-
- /* We need to lock this recursive mutex */
- EnterCriticalSection (&p_mutex->mutex);
- self = InterlockedCompareExchange (&p_mutex->owner, self, 0);
- assert (self == 0); /* no previous owner */
- return;
- }
- /* Non-recursive mutex */
- EnterCriticalSection (&p_mutex->mutex);
-
-#endif
-}
-
-
-/**
- * Releases a mutex (or crashes if the mutex is not locked by the caller).
- * @param p_mutex mutex locked with vlc_mutex_lock().
- */
-void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- int val = pthread_mutex_unlock( p_mutex );
- VLC_THREAD_ASSERT ("unlocking mutex");
-
-#elif defined( WIN32 )
- if (p_mutex->recursive)
- {
- if (p_mutex->recursion != 0)
- {
- p_mutex->recursion--;
- return; /* We still own this mutex */
- }
-
- /* We release the mutex */
- DWORD self = GetCurrentThreadId ();
- self = InterlockedCompareExchange (&p_mutex->owner, self, 0);
- assert (self == GetCurrentThreadId ());
- /* fall through */
- }
- LeaveCriticalSection (&p_mutex->mutex);
-
-#endif
-}
-
-/*****************************************************************************
- * vlc_cond_init: initialize a condition variable
- *****************************************************************************/
-int vlc_cond_init( vlc_cond_t *p_condvar )
-{
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_condattr_t attr;
- int ret;
-
- ret = pthread_condattr_init (&attr);
- if (ret)
- return ret;
-
-# if !defined (_POSIX_CLOCK_SELECTION)
- /* Fairly outdated POSIX support (that was defined in 2001) */
-# define _POSIX_CLOCK_SELECTION (-1)
-# endif
-# if (_POSIX_CLOCK_SELECTION >= 0)
- /* NOTE: This must be the same clock as the one in mtime.c */
- pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
-# endif
-
- ret = pthread_cond_init (p_condvar, &attr);
- pthread_condattr_destroy (&attr);
- return ret;
-
-#elif defined( WIN32 )
- /* Create a manual-reset event (manual reset is needed for broadcast). */
- *p_condvar = CreateEvent( NULL, TRUE, FALSE, NULL );
- return *p_condvar ? 0 : ENOMEM;
-
-#endif
-}
-
-/**
- * Destroys a condition variable. No threads shall be waiting or signaling the
- * condition.
- * @param p_condvar condition variable to destroy
- */
-void vlc_cond_destroy (vlc_cond_t *p_condvar)
-{
-#if defined( LIBVLC_USE_PTHREAD )
- int val = pthread_cond_destroy( p_condvar );
- VLC_THREAD_ASSERT ("destroying condition");
-
-#elif defined( WIN32 )
- CloseHandle( *p_condvar );
-
-#endif
-}
-
-/**
- * Wakes up one thread waiting on a condition variable, if any.
- * @param p_condvar condition variable
- */
-void vlc_cond_signal (vlc_cond_t *p_condvar)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- int val = pthread_cond_signal( p_condvar );
- VLC_THREAD_ASSERT ("signaling condition variable");
-
-#elif defined( WIN32 )
- /* NOTE: This will cause a broadcast, that is wrong.
- * This will also wake up the next waiting thread if no thread are yet
- * waiting, which is also wrong. However both of these issues are allowed
- * by the provision for spurious wakeups. Better have too many wakeups
- * than too few (= deadlocks). */
- SetEvent (*p_condvar);
-
-#endif
-}
-
-/**
- * Wakes up all threads (if any) waiting on a condition variable.
- * @param p_cond condition variable
- */
-void vlc_cond_broadcast (vlc_cond_t *p_condvar)
-{
-#if defined (LIBVLC_USE_PTHREAD)
- pthread_cond_broadcast (p_condvar);
-
-#elif defined (WIN32)
- SetEvent (*p_condvar);
-
-#endif
-}
-
-#ifdef UNDER_CE
-# warning FIXME
-# define WaitForMultipleObjectsEx(a,b,c) WaitForMultipleObjects(a,b)
-#endif
-
-/**
- * Waits for a condition variable. The calling thread will be suspended until
- * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
- * condition variable, the thread is cancelled with vlc_cancel(), or the
- * system causes a "spurious" unsolicited wake-up.
- *
- * A mutex is needed to wait on a condition variable. It must <b>not</b> be
- * a recursive mutex. Although it is possible to use the same mutex for
- * multiple condition, it is not valid to use different mutexes for the same
- * condition variable at the same time from different threads.
- *
- * In case of thread cancellation, the mutex is always locked before
- * cancellation proceeds.
- *
- * The canonical way to use a condition variable to wait for event foobar is:
- @code
- vlc_mutex_lock (&lock);
- mutex_cleanup_push (&lock); // release the mutex in case of cancellation
-
- while (!foobar)
- vlc_cond_wait (&wait, &lock);
-
- --- foobar is now true, do something about it here --
-
- vlc_cleanup_run (); // release the mutex
- @endcode
- *
- * @param p_condvar condition variable to wait on
- * @param p_mutex mutex which is unlocked while waiting,
- * then locked again when waking up.
- * @param deadline <b>absolute</b> timeout
- *
- * @return 0 if the condition was signaled, an error code in case of timeout.
- */
-void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- int val = pthread_cond_wait( p_condvar, p_mutex );
- VLC_THREAD_ASSERT ("waiting on condition");
-
-#elif defined( WIN32 )
- DWORD result;
-
- assert (!p_mutex->recursive);
- do
- {
- vlc_testcancel ();
- LeaveCriticalSection (&p_mutex->mutex);
- result = WaitForSingleObjectEx (*p_condvar, INFINITE, TRUE);
- EnterCriticalSection (&p_mutex->mutex);
- }
- while (result == WAIT_IO_COMPLETION);
-
- ResetEvent (*p_condvar);
-
-#endif
-}
-
-/**
- * Waits for a condition variable up to a certain date.
- * This works like vlc_cond_wait(), except for the additional timeout.
- *
- * @param p_condvar condition variable to wait on
- * @param p_mutex mutex which is unlocked while waiting,
- * then locked again when waking up.
- * @param deadline <b>absolute</b> timeout
- *
- * @return 0 if the condition was signaled, an error code in case of timeout.
- */
-int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
- mtime_t deadline)
-{
-#if defined(LIBVLC_USE_PTHREAD)
- lldiv_t d = lldiv( deadline, CLOCK_FREQ );
- struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
-
- int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
- if (val != ETIMEDOUT)
- VLC_THREAD_ASSERT ("timed-waiting on condition");
- return val;
-
-#elif defined( WIN32 )
- DWORD result;
-
- assert (!p_mutex->recursive);
- do
- {
- vlc_testcancel ();
-
- mtime_t total = (deadline - mdate ())/1000;
- if( total < 0 )
- total = 0;
-
- DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
- LeaveCriticalSection (&p_mutex->mutex);
- result = WaitForSingleObjectEx (*p_condvar, delay, TRUE);
- EnterCriticalSection (&p_mutex->mutex);
- }
- while (result == WAIT_IO_COMPLETION);
-
- ResetEvent (*p_condvar);
-
- return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
-
-#endif
-}
-
-/*****************************************************************************
- * vlc_tls_create: create a thread-local variable
- *****************************************************************************/
-int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
-{
- int i_ret;
-
-#if defined( LIBVLC_USE_PTHREAD )
- i_ret = pthread_key_create( p_tls, destr );
-#elif defined( UNDER_CE )
- i_ret = ENOSYS;
-#elif defined( WIN32 )
- /* FIXME: remember/use the destr() callback and stop leaking whatever */
- *p_tls = TlsAlloc();
- i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
-#else
-# error Unimplemented!
-#endif
- return i_ret;
-}
-
-void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
-{
-#if defined( LIBVLC_USE_PTHREAD )
- pthread_key_delete (*p_tls);
-#elif defined( UNDER_CE )
-#elif defined( WIN32 )
- TlsFree (*p_tls);
-#else
-# error Unimplemented!
-#endif
-}
-
-#if defined (LIBVLC_USE_PTHREAD)
-#elif defined (WIN32)
-static unsigned __stdcall vlc_entry (void *data)
-{
- vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
- vlc_thread_t self = data;
-
- vlc_threadvar_set (&cancel_key, &cancel_data);
- self->data = self->entry (self->data);
- return 0;
-}