* vlc_threads.h : threads implementation for the VideoLAN client
* This header provides portable declarations for mutexes & conditions
*****************************************************************************
- * Copyright (C) 1999, 2002 the VideoLAN team
- * $Id$
+ * Copyright (C) 1999, 2002 VLC authors and VideoLAN
+ * Copyright © 2007-2008 Rémi Denis-Courmont
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@via.ecp.fr>
* Gildas Bazin <gbazin@netcourrier.com>
* Christophe Massiot <massiot@via.ecp.fr>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software 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_
+
+/**
+ * \file
+ * This file defines structures and functions for handling threads in vlc
+ *
+ */
+
+#if defined (WIN32)
+# include <process.h>
+# ifndef ETIMEDOUT
+# define ETIMEDOUT 10060 /* This is the value in winsock.h. */
+# endif
+
+typedef struct vlc_thread *vlc_thread_t;
+typedef struct
+{
+ bool dynamic;
+ union
+ {
+ struct
+ {
+ bool locked;
+ unsigned long contention;
+ };
+ CRITICAL_SECTION mutex;
+ };
+} vlc_mutex_t;
+#define VLC_STATIC_MUTEX { false, { { false, 0 } } }
+typedef struct
+{
+ HANDLE handle;
+ unsigned clock;
+} vlc_cond_t;
+#define VLC_STATIC_COND { 0, 0 }
+typedef HANDLE vlc_sem_t;
+#define LIBVLC_NEED_RWLOCK
+typedef struct vlc_threadvar *vlc_threadvar_t;
+typedef struct vlc_timer *vlc_timer_t;
+
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT THREAD_PRIORITY_ABOVE_NORMAL
+# define VLC_THREAD_PRIORITY_AUDIO THREAD_PRIORITY_HIGHEST
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT THREAD_PRIORITY_ABOVE_NORMAL
+# define VLC_THREAD_PRIORITY_HIGHEST THREAD_PRIORITY_TIME_CRITICAL
+
+#elif defined (__OS2__)
+# include <errno.h>
+
+typedef struct vlc_thread *vlc_thread_t;
+typedef struct
+{
+ bool dynamic;
+ union
+ {
+ struct
+ {
+ bool locked;
+ unsigned long contention;
+ };
+ HMTX hmtx;
+ };
+} vlc_mutex_t;
+#define VLC_STATIC_MUTEX { false, { { false, 0 } } }
+typedef struct
+{
+ HEV hev;
+ unsigned clock;
+} vlc_cond_t;
+#define VLC_STATIC_COND { 0, 0 }
+#define LIBVLC_NEED_SEMAPHORE
+#define LIBVLC_NEED_RWLOCK
+typedef struct vlc_threadvar *vlc_threadvar_t;
+typedef struct vlc_timer *vlc_timer_t;
+
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT \
+ MAKESHORT(PRTYD_MAXIMUM / 2, PRTYC_REGULAR)
+# define VLC_THREAD_PRIORITY_AUDIO MAKESHORT(PRTYD_MAXIMUM, PRTYC_REGULAR)
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT \
+ MAKESHORT(PRTYD_MAXIMUM / 2, PRTYC_REGULAR)
+# define VLC_THREAD_PRIORITY_HIGHEST MAKESHORT(0, PRTYC_TIMECRITICAL)
+
+# define pthread_sigmask sigprocmask
+
+#elif defined (__ANDROID__) /* pthreads subset without pthread_cancel() */
+# include <unistd.h>
+# include <pthread.h>
+# include <poll.h>
+# define LIBVLC_USE_PTHREAD_CLEANUP 1
+# define LIBVLC_NEED_SEMAPHORE
+# define LIBVLC_NEED_RWLOCK
+
+typedef struct vlc_thread *vlc_thread_t;
+typedef pthread_mutex_t vlc_mutex_t;
+#define VLC_STATIC_MUTEX PTHREAD_MUTEX_INITIALIZER
+typedef struct
+{
+ pthread_cond_t cond;
+ unsigned clock;
+} vlc_cond_t;
+#define VLC_STATIC_COND { PTHREAD_COND_INITIALIZER, CLOCK_REALTIME }
-#ifndef _VLC_THREADS_H_
-#define _VLC_THREADS_H_
+typedef pthread_key_t vlc_threadvar_t;
+typedef struct vlc_timer *vlc_timer_t;
-#include <stdio.h>
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 0
+# define VLC_THREAD_PRIORITY_AUDIO 0
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 0
+# define VLC_THREAD_PRIORITY_HIGHEST 0
-#if defined( UNDER_CE )
- /* WinCE API */
-#elif defined( WIN32 )
-# include <process.h> /* Win32 API */
+#elif defined (__APPLE__)
+# define _APPLE_C_SOURCE 1 /* Proper pthread semantics on OSX */
+# include <unistd.h>
+# include <pthread.h>
+/* Unnamed POSIX semaphores not supported on Mac OS X */
+# include <mach/semaphore.h>
+# include <mach/task.h>
+# include <libkern/OSAtomic.h> /* OSMemoryBarrier() */
+# define LIBVLC_USE_PTHREAD 1
+# define LIBVLC_USE_PTHREAD_CLEANUP 1
+# define LIBVLC_USE_PTHREAD_CANCEL 1
-#elif defined( HAVE_KERNEL_SCHEDULER_H ) /* BeOS */
-# include <kernel/OS.h>
-# include <kernel/scheduler.h>
-# include <byteorder.h>
+typedef pthread_t vlc_thread_t;
+typedef pthread_mutex_t vlc_mutex_t;
+#define VLC_STATIC_MUTEX PTHREAD_MUTEX_INITIALIZER
+typedef pthread_cond_t vlc_cond_t;
+#define VLC_STATIC_COND PTHREAD_COND_INITIALIZER
+typedef semaphore_t vlc_sem_t;
+typedef pthread_rwlock_t vlc_rwlock_t;
+#define VLC_STATIC_RWLOCK PTHREAD_RWLOCK_INITIALIZER
+typedef pthread_key_t vlc_threadvar_t;
+typedef struct vlc_timer *vlc_timer_t;
-#else /* pthreads (like Linux & BSD) */
-# define LIBVLC_USE_PTHREAD 1
-# define _APPLE_C_SOURCE 1 /* Proper pthread semantics on OSX */
+# 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
-# include <unistd.h> /* _POSIX_SPIN_LOCKS */
-# include <pthread.h>
- /* Needed for pthread_cond_timedwait */
-# include <errno.h>
-# include <time.h>
+#else /* POSIX threads */
+# include <unistd.h> /* _POSIX_SPIN_LOCKS */
+# include <pthread.h>
+# include <semaphore.h>
+# define LIBVLC_USE_PTHREAD 1
+# define LIBVLC_USE_PTHREAD_CLEANUP 1
+# define LIBVLC_USE_PTHREAD_CANCEL 1
+
+typedef pthread_t vlc_thread_t;
+typedef pthread_mutex_t vlc_mutex_t;
+#define VLC_STATIC_MUTEX PTHREAD_MUTEX_INITIALIZER
+typedef pthread_cond_t vlc_cond_t;
+#define VLC_STATIC_COND PTHREAD_COND_INITIALIZER
+typedef sem_t vlc_sem_t;
+typedef pthread_rwlock_t vlc_rwlock_t;
+#define VLC_STATIC_RWLOCK PTHREAD_RWLOCK_INITIALIZER
+typedef pthread_key_t vlc_threadvar_t;
+typedef struct vlc_timer *vlc_timer_t;
+
+# 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
#endif
+#ifdef LIBVLC_NEED_SEMAPHORE
+typedef struct vlc_sem
+{
+ vlc_mutex_t lock;
+ vlc_cond_t wait;
+ unsigned value;
+} vlc_sem_t;
+#endif
+
+#ifdef LIBVLC_NEED_RWLOCK
+typedef struct vlc_rwlock
+{
+ vlc_mutex_t mutex;
+ vlc_cond_t wait;
+ long state;
+} vlc_rwlock_t;
+# define VLC_STATIC_RWLOCK { VLC_STATIC_MUTEX, VLC_STATIC_COND, 0 }
+#endif
+
/*****************************************************************************
- * Constants
+ * Function definitions
*****************************************************************************/
+VLC_API void vlc_mutex_init( vlc_mutex_t * );
+VLC_API void vlc_mutex_init_recursive( vlc_mutex_t * );
+VLC_API void vlc_mutex_destroy( vlc_mutex_t * );
+VLC_API void vlc_mutex_lock( vlc_mutex_t * );
+VLC_API int vlc_mutex_trylock( vlc_mutex_t * ) VLC_USED;
+VLC_API void vlc_mutex_unlock( vlc_mutex_t * );
+VLC_API void vlc_cond_init( vlc_cond_t * );
+VLC_API void vlc_cond_init_daytime( vlc_cond_t * );
+VLC_API void vlc_cond_destroy( vlc_cond_t * );
+VLC_API void vlc_cond_signal(vlc_cond_t *);
+VLC_API void vlc_cond_broadcast(vlc_cond_t *);
+VLC_API void vlc_cond_wait(vlc_cond_t *, vlc_mutex_t *);
+VLC_API int vlc_cond_timedwait(vlc_cond_t *, vlc_mutex_t *, mtime_t);
+VLC_API void vlc_sem_init(vlc_sem_t *, unsigned);
+VLC_API void vlc_sem_destroy(vlc_sem_t *);
+VLC_API int vlc_sem_post(vlc_sem_t *);
+VLC_API void vlc_sem_wait(vlc_sem_t *);
-/* 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
-
-#elif defined(SYS_BEOS)
-# define VLC_THREAD_PRIORITY_LOW 5
-# define VLC_THREAD_PRIORITY_INPUT 10
-# define VLC_THREAD_PRIORITY_AUDIO 10
-# define VLC_THREAD_PRIORITY_VIDEO 5
-# define VLC_THREAD_PRIORITY_OUTPUT 15
-# define VLC_THREAD_PRIORITY_HIGHEST 15
-
-#elif defined(LIBVLC_USE_PTHREAD)
-# 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(WIN32) || defined(UNDER_CE)
-/* Define different priorities for WinNT/2K/XP and Win9x/Me */
-# define VLC_THREAD_PRIORITY_LOW 0
-# define VLC_THREAD_PRIORITY_INPUT \
- (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
-# define VLC_THREAD_PRIORITY_AUDIO \
- (IS_WINNT ? THREAD_PRIORITY_HIGHEST : 0)
-# define VLC_THREAD_PRIORITY_VIDEO \
- (IS_WINNT ? 0 : THREAD_PRIORITY_BELOW_NORMAL )
-# define VLC_THREAD_PRIORITY_OUTPUT \
- (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
-# define VLC_THREAD_PRIORITY_HIGHEST \
- (IS_WINNT ? THREAD_PRIORITY_TIME_CRITICAL : 0)
+VLC_API void vlc_rwlock_init(vlc_rwlock_t *);
+VLC_API void vlc_rwlock_destroy(vlc_rwlock_t *);
+VLC_API void vlc_rwlock_rdlock(vlc_rwlock_t *);
+VLC_API void vlc_rwlock_wrlock(vlc_rwlock_t *);
+VLC_API void vlc_rwlock_unlock(vlc_rwlock_t *);
+VLC_API int vlc_threadvar_create(vlc_threadvar_t * , void (*) (void *) );
+VLC_API void vlc_threadvar_delete(vlc_threadvar_t *);
+VLC_API int vlc_threadvar_set(vlc_threadvar_t, void *);
+VLC_API void * vlc_threadvar_get(vlc_threadvar_t);
-#else
-# define VLC_THREAD_PRIORITY_LOW 0
-# define VLC_THREAD_PRIORITY_INPUT 0
-# define VLC_THREAD_PRIORITY_AUDIO 0
-# define VLC_THREAD_PRIORITY_VIDEO 0
-# define VLC_THREAD_PRIORITY_OUTPUT 0
-# define VLC_THREAD_PRIORITY_HIGHEST 0
+VLC_API int vlc_clone(vlc_thread_t *, void * (*) (void *), void *, int) VLC_USED;
+VLC_API void vlc_cancel(vlc_thread_t);
+VLC_API void vlc_join(vlc_thread_t, void **);
+VLC_API void vlc_control_cancel (int cmd, ...);
+VLC_API mtime_t mdate(void);
+VLC_API void mwait(mtime_t deadline);
+VLC_API void msleep(mtime_t delay);
+
+#define VLC_HARD_MIN_SLEEP 10000 /* 10 milliseconds = 1 tick at 100Hz */
+#define VLC_SOFT_MIN_SLEEP 9000000 /* 9 seconds */
+
+#if VLC_GCC_VERSION(4,3)
+/* Linux has 100, 250, 300 or 1000Hz
+ *
+ * HZ=100 by default on FreeBSD, but some architectures use a 1000Hz timer
+ */
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((error("sorry, cannot sleep for such short a time")))
+mtime_t impossible_delay( mtime_t delay )
+{
+ (void) delay;
+ return VLC_HARD_MIN_SLEEP;
+}
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((warning("use proper event handling instead of short delay")))
+mtime_t harmful_delay( mtime_t delay )
+{
+ return delay;
+}
+
+# define check_delay( d ) \
+ ((__builtin_constant_p(d < VLC_HARD_MIN_SLEEP) \
+ && (d < VLC_HARD_MIN_SLEEP)) \
+ ? impossible_delay(d) \
+ : ((__builtin_constant_p(d < VLC_SOFT_MIN_SLEEP) \
+ && (d < VLC_SOFT_MIN_SLEEP)) \
+ ? harmful_delay(d) \
+ : d))
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((error("deadlines can not be constant")))
+mtime_t impossible_deadline( mtime_t deadline )
+{
+ return deadline;
+}
+
+# define check_deadline( d ) \
+ (__builtin_constant_p(d) ? impossible_deadline(d) : d)
+#else
+# define check_delay(d) (d)
+# define check_deadline(d) (d)
#endif
-/*****************************************************************************
- * Type definitions
- *****************************************************************************/
+#define msleep(d) msleep(check_delay(d))
+#define mwait(d) mwait(check_deadline(d))
-#if defined( WIN32 ) || defined( UNDER_CE )
-typedef struct
+VLC_API int vlc_timer_create(vlc_timer_t *, void (*) (void *), void *) VLC_USED;
+VLC_API void vlc_timer_destroy(vlc_timer_t);
+VLC_API void vlc_timer_schedule(vlc_timer_t, bool, mtime_t, mtime_t);
+VLC_API unsigned vlc_timer_getoverrun(vlc_timer_t) VLC_USED;
+
+VLC_API unsigned vlc_GetCPUCount(void);
+
+VLC_API int vlc_savecancel(void);
+VLC_API void vlc_restorecancel(int state);
+VLC_API void vlc_testcancel(void);
+
+#if defined (LIBVLC_USE_PTHREAD_CLEANUP)
+/**
+ * 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
+enum
{
- /* 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;
+ VLC_CLEANUP_PUSH,
+ VLC_CLEANUP_POP,
+};
+typedef struct vlc_cleanup_t vlc_cleanup_t;
-typedef BOOL (WINAPI *SIGNALOBJECTANDWAIT) ( HANDLE, HANDLE, DWORD, BOOL );
+struct vlc_cleanup_t
+{
+ vlc_cleanup_t *next;
+ void (*proc) (void *);
+ void *data;
+};
-typedef struct
+/* This macros opens a code block on purpose. This is needed for multiple
+ * calls within a single function. This also prevent Win32 developers 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_CLEANUO */
+
+#ifndef LIBVLC_USE_PTHREAD_CANCEL
+/* poll() with cancellation */
+static inline int vlc_poll (struct pollfd *fds, unsigned nfds, int timeout)
{
- /* WinNT/2K/XP implementation */
- HANDLE mutex;
- /* Win95/98/ME implementation */
- CRITICAL_SECTION csection;
-} vlc_mutex_t;
+ vlc_testcancel ();
-typedef struct
+ while (timeout > 50)
+ {
+ int val = poll (fds, nfds, timeout);
+ if (val != 0)
+ return val;
+ timeout -= 50;
+ vlc_testcancel ();
+ }
+
+ return poll (fds, nfds, timeout);
+}
+# define poll(u,n,t) vlc_poll(u, n, t)
+
+#endif /* LIBVLC_USE_PTHREAD_CANCEL */
+
+static inline void vlc_cleanup_lock (void *lock)
{
- volatile int i_waiting_threads;
- /* WinNT/2K/XP implementation */
- HANDLE event;
- /* Win95/98/ME implementation */
- HANDLE semaphore;
- CRITICAL_SECTION csection;
- int i_win9x_cv;
-} vlc_cond_t;
+ vlc_mutex_unlock ((vlc_mutex_t *)lock);
+}
+#define mutex_cleanup_push( lock ) vlc_cleanup_push (vlc_cleanup_lock, lock)
-typedef struct
+#if defined (_POSIX_SPIN_LOCKS) && ((_POSIX_SPIN_LOCKS - 0) > 0)
+typedef pthread_spinlock_t vlc_spinlock_t;
+
+/**
+ * Initializes a spinlock.
+ */
+static inline void vlc_spin_init (vlc_spinlock_t *spin)
{
- DWORD handle;
-} vlc_threadvar_t;
+ if (pthread_spin_init (spin, PTHREAD_PROCESS_PRIVATE))
+ abort ();
+}
-#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 */
+/**
+ * Acquires a spinlock.
+ */
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
+{
+ pthread_spin_lock (spin);
+}
-typedef thread_id vlc_thread_t;
+/**
+ * Releases a spinlock.
+ */
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
+{
+ pthread_spin_unlock (spin);
+}
-typedef struct
+/**
+ * Deinitializes a spinlock.
+ */
+static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
{
- int32_t init;
- sem_id lock;
-} vlc_mutex_t;
+ pthread_spin_destroy (spin);
+}
-typedef struct
+#elif defined (WIN32)
+typedef CRITICAL_SECTION vlc_spinlock_t;
+
+static inline void vlc_spin_init (vlc_spinlock_t *spin)
{
- int32_t init;
- thread_id thread;
-} vlc_cond_t;
+ if (!InitializeCriticalSectionAndSpinCount(spin, 4000))
+ abort ();
+}
-typedef struct
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
{
-} vlc_threadvar_t;
+ EnterCriticalSection(spin);
+}
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
+{
+ LeaveCriticalSection(spin);
+}
+
+static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
+{
+ DeleteCriticalSection(spin);
+}
#else
-typedef pthread_t vlc_thread_t;
-typedef struct
+/* Fallback to plain mutexes if spinlocks are not available */
+typedef vlc_mutex_t vlc_spinlock_t;
+
+static inline void vlc_spin_init (vlc_spinlock_t *spin)
{
- pthread_mutex_t mutex;
-} vlc_mutex_t;
-typedef struct
+ 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.
+ */
+static inline void barrier (void)
{
- pthread_cond_t cond;
-} vlc_cond_t;
+#if defined (__GNUC__) && !defined (__APPLE__) && \
+ ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
+ __sync_synchronize ();
+#elif defined(__APPLE__)
+ OSMemoryBarrier ();
+#elif defined(__powerpc__)
+ asm volatile ("sync":::"memory");
+#elif 0 // defined(__i386__) /* Requires SSE2 support */
+ 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
+}
-typedef struct
+#ifdef __cplusplus
+/**
+ * Helper C++ class to lock a mutex.
+ * The mutex is locked when the object is created, and unlocked when the object
+ * is destroyed.
+ */
+class vlc_mutex_locker
{
- pthread_key_t handle;
-} vlc_threadvar_t;
+ private:
+ vlc_mutex_t *lock;
+ public:
+ vlc_mutex_locker (vlc_mutex_t *m) : lock (m)
+ {
+ vlc_mutex_lock (lock);
+ }
+ ~vlc_mutex_locker (void)
+ {
+ vlc_mutex_unlock (lock);
+ }
+};
#endif
+enum
+{
+ VLC_AVCODEC_MUTEX = 0,
+ VLC_GCRYPT_MUTEX,
+ VLC_XLIB_MUTEX,
+ VLC_MOSAIC_MUTEX,
+ VLC_HIGHLIGHT_MUTEX,
+ VLC_ATOMIC_MUTEX,
+ /* Insert new entry HERE */
+ VLC_MAX_MUTEX
+};
+
+VLC_API void vlc_global_mutex( unsigned, bool );
+#define vlc_global_lock( n ) vlc_global_mutex( n, true )
+#define vlc_global_unlock( n ) vlc_global_mutex( n, false )
+
#endif /* !_VLC_THREADS_H */
projects / vlc / blobdiff