* This header provides portable declarations for mutexes & conditions
*****************************************************************************
* Copyright (C) 1999, 2002 the VideoLAN team
- * $Id$
+ * Copyright © 2007-2008 Rémi Denis-Courmont
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@via.ecp.fr>
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
-#if !defined( __LIBVLC__ )
- #error You are not libvlc or one of its plugins. You cannot include this file
-#endif
-
-#ifndef _VLC_THREADS_H_
-#define _VLC_THREADS_H_
+#ifndef VLC_THREADS_H_
+#define VLC_THREADS_H_
-#include <stdio.h>
-
-#if defined(DEBUG) && defined(HAVE_SYS_TIME_H)
-# include <sys/time.h>
-#endif
-
-#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */
-# include <pth.h>
-
-#elif defined( ST_INIT_IN_ST_H ) /* State threads */
-# include <st.h>
+/**
+ * \file
+ * This file defines structures and functions for handling threads in vlc
+ *
+ */
-#elif defined( UNDER_CE )
+#if defined( UNDER_CE )
/* WinCE API */
#elif defined( WIN32 )
# include <process.h> /* Win32 API */
+# include <errno.h>
-#elif defined( HAVE_KERNEL_SCHEDULER_H ) /* BeOS */
+#elif defined( SYS_BEOS ) /* BeOS */
# include <kernel/OS.h>
# include <kernel/scheduler.h>
# include <byteorder.h>
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) /* pthreads (like Linux & BSD) */
+#else /* pthreads (like Linux & BSD) */
# define LIBVLC_USE_PTHREAD 1
# define _APPLE_C_SOURCE 1 /* Proper pthread semantics on OSX */
+# include <stdlib.h> /* lldiv_t definition (only in C99) */
+# include <unistd.h> /* _POSIX_SPIN_LOCKS */
# include <pthread.h>
-# ifdef DEBUG
- /* Needed for pthread_cond_timedwait */
-# include <errno.h>
-# endif
- /* This is not prototyped under Linux, though it exists. */
- int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
-
-#elif defined( HAVE_CTHREADS_H ) /* GNUMach */
-# include <cthreads.h>
-
-#else
-# error no threads available on your system !
+ /* Needed for pthread_cond_timedwait */
+# include <errno.h>
+# include <time.h>
#endif
/* Thread priorities */
#ifdef __APPLE__
-# define VLC_THREAD_PRIORITY_LOW (-47)
-# define VLC_THREAD_PRIORITY_INPUT 37
-# define VLC_THREAD_PRIORITY_AUDIO 37
-# define VLC_THREAD_PRIORITY_VIDEO (-47)
-# define VLC_THREAD_PRIORITY_OUTPUT 37
-# define VLC_THREAD_PRIORITY_HIGHEST 37
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 22
+# define VLC_THREAD_PRIORITY_AUDIO 22
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 22
+# define VLC_THREAD_PRIORITY_HIGHEST 22
#elif defined(SYS_BEOS)
# define VLC_THREAD_PRIORITY_LOW 5
# define VLC_THREAD_PRIORITY_OUTPUT 15
# define VLC_THREAD_PRIORITY_HIGHEST 15
-#elif defined(PTHREAD_COND_T_IN_PTHREAD_H)
-# define VLC_THREAD_PRIORITY_LOW 0
-# define VLC_THREAD_PRIORITY_INPUT 20
-# define VLC_THREAD_PRIORITY_AUDIO 10
-# define VLC_THREAD_PRIORITY_VIDEO 0
-# define VLC_THREAD_PRIORITY_OUTPUT 30
-# define VLC_THREAD_PRIORITY_HIGHEST 40
+#elif defined(LIBVLC_USE_PTHREAD)
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 10
+# define VLC_THREAD_PRIORITY_AUDIO 5
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 15
+# define VLC_THREAD_PRIORITY_HIGHEST 20
#elif defined(WIN32) || defined(UNDER_CE)
/* Define different priorities for WinNT/2K/XP and Win9x/Me */
* Type definitions
*****************************************************************************/
-#if defined( PTH_INIT_IN_PTH_H )
-typedef pth_t vlc_thread_t;
-typedef struct
-{
- pth_mutex_t mutex;
- vlc_object_t * p_this;
-} vlc_mutex_t;
-typedef struct
-{
- pth_cond_t cond;
- vlc_object_t * p_this;
-} vlc_cond_t;
+#if defined (LIBVLC_USE_PTHREAD)
+typedef pthread_t vlc_thread_t;
+typedef pthread_mutex_t vlc_mutex_t;
+typedef pthread_cond_t vlc_cond_t;
+typedef pthread_key_t vlc_threadvar_t;
+
+#elif defined( WIN32 ) || defined( UNDER_CE )
typedef struct
{
- int handle;
-} vlc_threadvar_t;
+ HANDLE handle;
+ void *(*entry) (void *);
+ void *data;
+} *vlc_thread_t;
+
+typedef HANDLE vlc_mutex_t;
+typedef HANDLE vlc_cond_t;
+typedef DWORD vlc_threadvar_t;
+
+#elif defined( SYS_BEOS )
+/* This is the BeOS implementation of the vlc threads, note that the mutex is
+ * not a real mutex and the cond_var is not like a pthread cond_var but it is
+ * enough for what we need */
+
+typedef thread_id vlc_thread_t;
-#elif defined( ST_INIT_IN_ST_H )
-typedef st_thread_t vlc_thread_t;
typedef struct
{
- st_mutex_t mutex;
- vlc_object_t * p_this;
+ int32_t init;
+ sem_id lock;
} vlc_mutex_t;
+
typedef struct
{
- st_cond_t cond;
- vlc_object_t * p_this;
+ int32_t init;
+ thread_id thread;
} vlc_cond_t;
+
typedef struct
{
- int handle;
} vlc_threadvar_t;
-#elif defined( WIN32 ) || defined( UNDER_CE )
-typedef struct
+#endif
+
+#if defined( WIN32 ) && !defined ETIMEDOUT
+# define ETIMEDOUT 10060 /* This is the value in winsock.h. */
+#endif
+
+/*****************************************************************************
+ * Function definitions
+ *****************************************************************************/
+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 * , void (*) (void *) ) );
+VLC_EXPORT( void, vlc_threadvar_delete, (vlc_threadvar_t *) );
+VLC_EXPORT( int, __vlc_thread_create, ( vlc_object_t *, const char *, int, const char *, void * ( * ) ( vlc_object_t * ), int, bool ) );
+VLC_EXPORT( int, __vlc_thread_set_priority, ( vlc_object_t *, const char *, int, int ) );
+VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, const char *, int ) );
+
+VLC_EXPORT( int, vlc_clone, (vlc_thread_t *, void * (*) (void *), void *, int) );
+VLC_EXPORT( void, vlc_cancel, (vlc_thread_t) );
+VLC_EXPORT( int, vlc_join, (vlc_thread_t, void **) );
+VLC_EXPORT (void, vlc_control_cancel, (int cmd, ...));
+
+#ifndef LIBVLC_USE_PTHREAD
+enum {
+ VLC_SAVE_CANCEL,
+ VLC_RESTORE_CANCEL,
+ VLC_TEST_CANCEL,
+ VLC_DO_CANCEL,
+ VLC_CLEANUP_PUSH,
+ VLC_CLEANUP_POP,
+};
+#endif
+
+#define vlc_thread_ready vlc_object_signal
+
+/*****************************************************************************
+ * vlc_mutex_lock: lock a mutex
+ *****************************************************************************/
+#define vlc_mutex_lock( P_MUTEX ) \
+ __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
+
+VLC_EXPORT(void, vlc_pthread_fatal, (const char *action, int error, const char *file, unsigned line));
+
+#if defined(LIBVLC_USE_PTHREAD)
+# define VLC_THREAD_ASSERT( action ) \
+ if (val) \
+ vlc_pthread_fatal (action, val, psz_file, i_line)
+#else
+# define VLC_THREAD_ASSERT ((void)(val))
+#endif
+
+static inline void __vlc_mutex_lock( const char * psz_file, int i_line,
+ vlc_mutex_t * p_mutex )
{
- /* thread id */
- DWORD id;
- /*
- ** handle to created thread, needs be closed to dispose of it
- ** even after thread has exited
- */
- HANDLE hThread;
-} vlc_thread_t;
+#if defined(LIBVLC_USE_PTHREAD)
+# define vlc_assert_locked( m ) \
+ assert (pthread_mutex_lock (m) == EDEADLK)
+ int val = pthread_mutex_lock( p_mutex );
+ VLC_THREAD_ASSERT ("locking mutex");
-typedef BOOL (WINAPI *SIGNALOBJECTANDWAIT) ( HANDLE, HANDLE, DWORD, BOOL );
+#elif defined( UNDER_CE )
+ (void)psz_file; (void)i_line;
-typedef struct
+ EnterCriticalSection( &p_mutex->csection );
+
+#elif defined( WIN32 )
+ (void)psz_file; (void)i_line;
+
+ WaitForSingleObject( *p_mutex, INFINITE );
+
+#elif defined( SYS_BEOS )
+ acquire_sem( p_mutex->lock );
+
+#endif
+}
+
+#ifndef vlc_assert_locked
+# define vlc_assert_locked( m ) (void)m
+#endif
+
+/*****************************************************************************
+ * vlc_mutex_unlock: unlock a mutex
+ *****************************************************************************/
+#define vlc_mutex_unlock( P_MUTEX ) \
+ __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
+
+static inline void __vlc_mutex_unlock( const char * psz_file, int i_line,
+ vlc_mutex_t *p_mutex )
{
- /* WinNT/2K/XP implementation */
- HANDLE mutex;
- /* Win95/98/ME implementation */
- CRITICAL_SECTION csection;
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_mutex_unlock( p_mutex );
+ VLC_THREAD_ASSERT ("unlocking mutex");
- vlc_object_t * p_this;
-} vlc_mutex_t;
+#elif defined( UNDER_CE )
+ (void)psz_file; (void)i_line;
-typedef struct
+ LeaveCriticalSection( &p_mutex->csection );
+
+#elif defined( WIN32 )
+ (void)psz_file; (void)i_line;
+
+ ReleaseMutex( *p_mutex );
+
+#elif defined( SYS_BEOS )
+ release_sem( p_mutex->lock );
+
+#endif
+}
+
+/*****************************************************************************
+ * vlc_mutex_destroy: destroy a mutex
+ *****************************************************************************/
+#define vlc_mutex_destroy( P_MUTEX ) \
+ __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
+
+/**
+ * Save the cancellation state and disable cancellation for the calling thread.
+ * This function must be called before entering a piece of code that is not
+ * cancellation-safe.
+ * @return Previous cancellation state (opaque value).
+ */
+static inline int vlc_savecancel (void)
{
- volatile int i_waiting_threads;
- /* WinNT/2K/XP implementation */
- HANDLE event;
- SIGNALOBJECTANDWAIT SignalObjectAndWait;
- /* Win95/98/ME implementation */
- HANDLE semaphore;
- CRITICAL_SECTION csection;
- int i_win9x_cv;
-
- vlc_object_t * p_this;
-} vlc_cond_t;
+ int state;
+#if defined (LIBVLC_USE_PTHREAD)
+ (void) pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state);
+#else
+ vlc_control_cancel (VLC_SAVE_CANCEL, &state);
+#endif
+ return state;
+}
+
+/**
+ * Restore the cancellation state for the calling thread.
+ * @param state previous state as returned by vlc_savecancel().
+ * @return Nothing, always succeeds.
+ */
+static inline void vlc_restorecancel (int state)
+{
+#if defined (LIBVLC_USE_PTHREAD)
+ (void) pthread_setcancelstate (state, NULL);
+#else
+ vlc_control_cancel (VLC_RESTORE_CANCEL, state);
+#endif
+}
+
+/**
+ * Issues an explicit deferred cancellation point.
+ * This has no effect if thread cancellation is disabled.
+ * This can be called when there is a rather slow non-sleeping operation.
+ */
+static inline void vlc_testcancel (void)
+{
+#if defined (LIBVLC_USE_PTHREAD)
+ pthread_testcancel ();
+#else
+ vlc_control_cancel (VLC_TEST_CANCEL);
+#endif
+}
+
+#if defined (LIBVLC_USE_PTHREAD)
+/**
+ * Registers a new procedure to run if the thread is cancelled (or otherwise
+ * exits prematurely). Any call to vlc_cleanup_push() <b>must</b> paired with a
+ * call to either vlc_cleanup_pop() or vlc_cleanup_run(). Branching into or out
+ * of the block between these two function calls is not allowed (read: it will
+ * likely crash the whole process). If multiple procedures are registered,
+ * they are handled in last-in first-out order.
+ *
+ * @param routine procedure to call if the thread ends
+ * @param arg argument for the procedure
+ */
+# define vlc_cleanup_push( routine, arg ) pthread_cleanup_push (routine, arg)
+
+/**
+ * Removes a cleanup procedure that was previously registered with
+ * vlc_cleanup_push().
+ */
+# define vlc_cleanup_pop( ) pthread_cleanup_pop (0)
+
+/**
+ * Removes a cleanup procedure that was previously registered with
+ * vlc_cleanup_push(), and executes it.
+ */
+# define vlc_cleanup_run( ) pthread_cleanup_pop (1)
+#else
+typedef struct vlc_cleanup_t vlc_cleanup_t;
-typedef struct
+struct vlc_cleanup_t
{
- DWORD handle;
-} vlc_threadvar_t;
+ vlc_cleanup_t *next;
+ void (*proc) (void *);
+ void *data;
+};
+
+/* This macros opens a code block on purpose. This is needed for multiple
+ * calls within a single function. This also prevent Win32 developpers from
+ * writing code that would break on POSIX (POSIX opens a block as well). */
+# define vlc_cleanup_push( routine, arg ) \
+ do { \
+ vlc_cleanup_t vlc_cleanup_data = { NULL, routine, arg, }; \
+ vlc_control_cancel (VLC_CLEANUP_PUSH, &vlc_cleanup_data)
+
+# define vlc_cleanup_pop( ) \
+ vlc_control_cancel (VLC_CLEANUP_POP); \
+ } while (0)
+
+# define vlc_cleanup_run( ) \
+ vlc_control_cancel (VLC_CLEANUP_POP); \
+ vlc_cleanup_data.proc (vlc_cleanup_data.data); \
+ } while (0)
+
+#endif /* LIBVLC_USE_PTHREAD */
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
-/* This is the BeOS implementation of the vlc threads, note that the mutex is
- * not a real mutex and the cond_var is not like a pthread cond_var but it is
- * enough for what we need */
+/*****************************************************************************
+ * vlc_cond_init: initialize a condition
+ *****************************************************************************/
+#define vlc_cond_init( P_THIS, P_COND ) \
+ __vlc_cond_init( P_COND )
-typedef thread_id vlc_thread_t;
+/*****************************************************************************
+ * vlc_cond_signal: start a thread on condition completion
+ *****************************************************************************/
+#define vlc_cond_signal( P_COND ) \
+ __vlc_cond_signal( __FILE__, __LINE__, P_COND )
-typedef struct
+static inline void __vlc_cond_signal( const char * psz_file, int i_line,
+ vlc_cond_t *p_condvar )
{
- int32_t init;
- sem_id lock;
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_cond_signal( p_condvar );
+ VLC_THREAD_ASSERT ("signaling condition variable");
+
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ (void)psz_file; (void)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 */
+ /* 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 );
+
+#elif defined( SYS_BEOS )
+ 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 )
+ {
+ /* 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 );
+ }
+ }
- vlc_object_t * p_this;
-} vlc_mutex_t;
+#endif
+}
-typedef struct
+/*****************************************************************************
+ * vlc_cond_wait: wait until condition completion
+ *****************************************************************************/
+#define vlc_cond_wait( P_COND, P_MUTEX ) \
+ __vlc_cond_wait( __FILE__, __LINE__, P_COND, 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 )
{
- int32_t init;
- thread_id thread;
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_cond_wait( p_condvar, p_mutex );
+ VLC_THREAD_ASSERT ("waiting on condition");
- vlc_object_t * p_this;
-} vlc_cond_t;
+#elif defined( UNDER_CE )
+ LeaveCriticalSection( &p_mutex->csection );
+ WaitForSingleObject( *p_condvar, INFINITE );
-typedef struct
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
+
+#elif defined( WIN32 )
+ DWORD result;
+
+ do
+ {
+ vlc_testcancel ();
+ result = SignalObjectAndWait (*p_mutex, *p_condvar, INFINITE, TRUE);
+
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
+ }
+ while (result == WAIT_IO_COMPLETION);
+
+ vlc_testcancel ();
+
+ (void)psz_file; (void)i_line;
+
+#elif defined( SYS_BEOS )
+ /* 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 */
+ p_condvar->thread = find_thread( NULL );
+ vlc_mutex_unlock( p_mutex );
+ suspend_thread( p_condvar->thread );
+ p_condvar->thread = -1;
+
+ vlc_mutex_lock( p_mutex );
+
+#endif
+}
+
+
+/*****************************************************************************
+ * vlc_cond_timedwait: wait until condition completion or expiration
+ *****************************************************************************
+ * Returns 0 if object signaled, an error code in case of timeout or error.
+ *****************************************************************************/
+#define vlc_cond_timedwait( P_COND, P_MUTEX, DEADLINE ) \
+ __vlc_cond_timedwait( __FILE__, __LINE__, P_COND, P_MUTEX, DEADLINE )
+
+static inline int __vlc_cond_timedwait( const char * psz_file, int i_line,
+ vlc_cond_t *p_condvar,
+ vlc_mutex_t *p_mutex,
+ mtime_t deadline )
{
-} vlc_threadvar_t;
+#if defined(LIBVLC_USE_PTHREAD)
+ lldiv_t d = lldiv( deadline, 1000000 );
+ struct timespec ts = { d.quot, d.rem * 1000 };
+ int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
+ if (val != ETIMEDOUT)
+ VLC_THREAD_ASSERT ("timed-waiting on condition");
+ return val;
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
-typedef pthread_t vlc_thread_t;
-typedef struct
+#elif defined( UNDER_CE )
+ mtime_t delay_ms = (deadline - mdate())/1000;
+ DWORD result;
+ if( delay_ms < 0 )
+ delay_ms = 0;
+
+ LeaveCriticalSection( &p_mutex->csection );
+ result = WaitForSingleObject( *p_condvar, delay_ms );
+
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
+
+ (void)psz_file; (void)i_line;
+
+ return (result == WAIT_TIMEOUT) ? ETIMEDOUT : 0;
+
+#elif defined( WIN32 )
+ mtime_t total;
+ DWORD result = WAIT_TIMEOUT;
+
+ (void)psz_file; (void)i_line;
+
+ vlc_testcancel ();
+ while ((total = (deadline - mdate ()) > 0))
+ {
+ DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
+ result = SignalObjectAndWait( *p_mutex, *p_condvar,
+ delay, TRUE );
+
+ /* Reacquire the mutex before return/cancel. */
+ vlc_mutex_lock (p_mutex);
+ if (result == WAIT_OBJECT_0)
+ return 0; /* Condition signaled! */
+ vlc_testcancel ();
+ }
+ return ETIMEDOUT;
+
+#elif defined( SYS_BEOS )
+# error Unimplemented
+
+#endif
+}
+
+/*****************************************************************************
+ * vlc_cond_destroy: destroy a condition
+ *****************************************************************************/
+#define vlc_cond_destroy( P_COND ) \
+ __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
+
+/*****************************************************************************
+ * vlc_threadvar_set: create: set the value of a thread-local variable
+ *****************************************************************************/
+static inline int vlc_threadvar_set( vlc_threadvar_t * p_tls, void *p_value )
{
- pthread_mutex_t mutex;
- vlc_object_t * p_this;
-} vlc_mutex_t;
-typedef struct
+ int i_ret;
+
+#if defined(LIBVLC_USE_PTHREAD)
+ i_ret = pthread_setspecific( *p_tls, p_value );
+
+#elif defined( SYS_BEOS )
+ i_ret = EINVAL;
+
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ i_ret = TlsSetValue( *p_tls, p_value ) ? EINVAL : 0;
+
+#endif
+
+ return i_ret;
+}
+
+/*****************************************************************************
+ * vlc_threadvar_get: create: get the value of a thread-local variable
+ *****************************************************************************/
+static inline void* vlc_threadvar_get( vlc_threadvar_t * p_tls )
{
- pthread_cond_t cond;
- vlc_object_t * p_this;
-} vlc_cond_t;
+ void *p_ret;
-typedef struct
+#if defined(LIBVLC_USE_PTHREAD)
+ p_ret = pthread_getspecific( *p_tls );
+
+#elif defined( SYS_BEOS )
+ p_ret = NULL;
+
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ p_ret = TlsGetValue( *p_tls );
+
+#endif
+
+ return p_ret;
+}
+
+# if defined (_POSIX_SPIN_LOCKS) && ((_POSIX_SPIN_LOCKS - 0) > 0)
+typedef pthread_spinlock_t vlc_spinlock_t;
+
+/**
+ * Initializes a spinlock.
+ */
+static inline int vlc_spin_init (vlc_spinlock_t *spin)
{
- pthread_key_t handle;
-} vlc_threadvar_t;
+ return pthread_spin_init (spin, PTHREAD_PROCESS_PRIVATE);
+}
-#elif defined( HAVE_CTHREADS_H )
-typedef cthread_t vlc_thread_t;
+/**
+ * Acquires a spinlock.
+ */
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
+{
+ pthread_spin_lock (spin);
+}
-/* Those structs are the ones defined in /include/cthreads.h but we need
- * to handle (&foo) where foo is a (mutex_t) while they handle (foo) where
- * foo is a (mutex_t*) */
-typedef struct
+/**
+ * Releases a spinlock.
+ */
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
{
- spin_lock_t held;
- spin_lock_t lock;
- char *name;
- struct cthread_queue queue;
+ pthread_spin_unlock (spin);
+}
- vlc_object_t * p_this;
-} vlc_mutex_t;
+/**
+ * Deinitializes a spinlock.
+ */
+static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
+{
+ pthread_spin_destroy (spin);
+}
-typedef struct
+#elif defined( WIN32 )
+
+typedef CRITICAL_SECTION vlc_spinlock_t;
+
+/**
+ * Initializes a spinlock.
+ */
+static inline int vlc_spin_init (vlc_spinlock_t *spin)
{
- spin_lock_t lock;
- struct cthread_queue queue;
- char *name;
- struct cond_imp *implications;
+ return !InitializeCriticalSectionAndSpinCount(spin, 4000);
+}
- vlc_object_t * p_this;
-} vlc_cond_t;
+/**
+ * Acquires a spinlock.
+ */
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
+{
+ EnterCriticalSection(spin);
+}
-typedef struct
+/**
+ * Releases a spinlock.
+ */
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
{
- cthread_key_t handle;
-} vlc_threadvar_t;
+ 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
+/**
+ * Issues a full memory barrier.
+ */
+#if defined (__APPLE__)
+# include <libkern/OSAtomic.h> /* OSMemoryBarrier() */
#endif
+static inline void barrier (void)
+{
+#if defined (__GNUC__) && (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
+ __sync_synchronize ();
+#elif defined(__APPLE__)
+ OSMemoryBarrier ();
+#elif defined(__powerpc__)
+ asm volatile ("sync":::"memory");
+#elif defined(__i386__)
+ asm volatile ("mfence":::"memory");
+#else
+ vlc_spinlock_t spin;
+ vlc_spin_init (&spin);
+ vlc_spin_lock (&spin);
+ vlc_spin_unlock (&spin);
+ vlc_spin_destroy (&spin);
+#endif
+}
+
+/*****************************************************************************
+ * vlc_thread_create: create a thread
+ *****************************************************************************/
+#define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, PRIORITY, WAIT ) \
+ __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, FUNC, PRIORITY, WAIT )
+
+/*****************************************************************************
+ * vlc_thread_set_priority: set the priority of the calling thread
+ *****************************************************************************/
+#define vlc_thread_set_priority( P_THIS, PRIORITY ) \
+ __vlc_thread_set_priority( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PRIORITY )
+
+/*****************************************************************************
+ * vlc_thread_join: wait until a thread exits
+ *****************************************************************************/
+#define vlc_thread_join( P_THIS ) \
+ __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
+
+#endif /* !_VLC_THREADS_H */
projects / vlc / blobdiff