# include "config.h"
#endif
-#include <vlc/vlc.h>
+#include <vlc_common.h>
#include "libvlc.h"
#include <assert.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
+#include <signal.h>
#define VLC_THREADS_UNINITIALIZED 0
#define VLC_THREADS_PENDING 1
static volatile unsigned i_initializations = 0;
#if defined( LIBVLC_USE_PTHREAD )
+# include <sched.h>
+
static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
return p_root;
}
+#ifndef NDEBUG
+/**
+ * Object running the current thread
+ */
+static vlc_threadvar_t thread_object_key;
+
+vlc_object_t *vlc_threadobj (void)
+{
+ return vlc_threadvar_get (&thread_object_key);
+}
+#endif
vlc_threadvar_t msg_context_global_key;
return v.i;
}
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE)
+# include <execinfo.h>
+#endif
/*****************************************************************************
* vlc_thread_fatal: Report an error from the threading layer
{
fprintf (stderr, "LibVLC fatal error %s in thread %lu at %s:%u: %d\n",
action, vlc_threadid (), file, line, error);
- fflush (stderr);
/* 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\n");
+ fprintf (stderr, " Error message: %m at:\n");
#else
char buf[1000];
const char *msg;
}
fprintf (stderr, " Error message: %s\n", msg);
#endif
-
fflush (stderr);
+
+#ifdef HAVE_BACKTRACE
+ void *stack[20];
+ int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
+ backtrace_symbols_fd (stack, len, 2);
+#endif
+
abort ();
}
+#else
+void vlc_pthread_fatal (const char *action, int error,
+ const char *file, unsigned line)
+{
+ (void)action; (void)error; (void)file; (void)line;
+ abort();
+}
#endif
-
/*****************************************************************************
* vlc_threads_init: initialize threads system
*****************************************************************************
if( i_initializations == 0 )
{
- p_root = vlc_custom_create( NULL, sizeof( *p_root ),
+ p_root = vlc_custom_create( (vlc_object_t *)NULL, sizeof( *p_root ),
VLC_OBJECT_GENERIC, "root" );
if( p_root == NULL )
{
}
/* We should be safe now. Do all the initialization stuff we want. */
- vlc_threadvar_create( p_root, &msg_context_global_key );
+#ifndef NDEBUG
+ vlc_threadvar_create( &thread_object_key, NULL );
+#endif
+ vlc_threadvar_create( &msg_context_global_key, msg_StackDestroy );
}
i_initializations++;
assert( i_initializations > 0 );
if( i_initializations == 1 )
+ {
vlc_object_release( p_root );
+ vlc_threadvar_delete( &msg_context_global_key );
+#ifndef NDEBUG
+ vlc_threadvar_delete( &thread_object_key );
+#endif
+ }
i_initializations--;
#if defined( LIBVLC_USE_PTHREAD )
/*****************************************************************************
* vlc_tls_create: create a thread-local variable
*****************************************************************************/
-int __vlc_threadvar_create( vlc_threadvar_t *p_tls )
+int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
{
- int i_ret = -1;
+ int i_ret;
#if defined( LIBVLC_USE_PTHREAD )
- i_ret = pthread_key_create( p_tls, NULL );
+ i_ret = pthread_key_create( p_tls, destr );
#elif defined( UNDER_CE )
+ i_ret = ENOSYS;
#elif defined( WIN32 )
*p_tls = TlsAlloc();
i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
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
+}
+
+struct vlc_thread_boot
+{
+ void * (*entry) (void *);
+ vlc_object_t *object;
+};
+
+#if defined (LIBVLC_USE_PTHREAD)
+# define THREAD_RTYPE void *
+# define THREAD_RVAL NULL
+#elif defined (WIN32)
+# define THREAD_RTYPE __stdcall unsigned
+# define THREAD_RVAL 0
+#endif
+
+static THREAD_RTYPE thread_entry (void *data)
+{
+ vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
+ void *(*func) (void *) = ((struct vlc_thread_boot *)data)->entry;
+
+ free (data);
+#ifndef NDEBUG
+ vlc_threadvar_set (&thread_object_key, obj);
+#endif
+ msg_Dbg (obj, "thread started");
+ func (obj);
+ msg_Dbg (obj, "thread ended");
+
+ libvlc_priv_t *libpriv = libvlc_priv (obj->p_libvlc);
+ vlc_mutex_lock (&libpriv->threads_lock);
+ if (--libpriv->threads_count == 0)
+ vlc_cond_signal (&libpriv->threads_wait);
+ vlc_mutex_unlock (&libpriv->threads_lock);
+ return THREAD_RVAL;
+}
+
/*****************************************************************************
* vlc_thread_create: create a thread, inner version
*****************************************************************************
int i_priority, bool b_wait )
{
int i_ret;
- void *p_data = (void *)p_this;
vlc_object_internals_t *p_priv = vlc_internals( p_this );
+ libvlc_priv_t *libpriv = libvlc_priv (p_this->p_libvlc);
+
+ struct vlc_thread_boot *boot = malloc (sizeof (*boot));
+ if (boot == NULL)
+ return errno;
+ boot->entry = func;
+ boot->object = p_this;
+
+ vlc_mutex_lock (&libpriv->threads_lock);
+ libpriv->threads_count++;
+ vlc_mutex_unlock (&libpriv->threads_lock);
- vlc_mutex_lock( &p_this->object_lock );
+ vlc_object_lock( p_this );
+
+ /* Make sure we don't re-create a thread if the object has already one */
+ assert( !p_priv->b_thread );
#if defined( LIBVLC_USE_PTHREAD )
- i_ret = pthread_create( &p_priv->thread_id, NULL, func, p_data );
+ pthread_attr_t attr;
+ pthread_attr_init (&attr);
+
+ /* Block the signals that signals interface plugin handles.
+ * If the LibVLC caller wants to handle some signals by itself, it should
+ * block these before whenever invoking LibVLC. And it must obviously not
+ * start the VLC signals interface plugin.
+ *
+ * LibVLC will normally ignore any interruption caused by an asynchronous
+ * signal during a system call. But there may well be some buggy cases
+ * where it fails to handle EINTR (bug reports welcome). Some underlying
+ * libraries might also not handle EINTR properly.
+ */
+ sigset_t set, oldset;
+ sigemptyset (&set);
+ sigdelset (&set, SIGHUP);
+ sigaddset (&set, SIGINT);
+ sigaddset (&set, SIGQUIT);
+ sigaddset (&set, SIGTERM);
+
+ sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
+ pthread_sigmask (SIG_BLOCK, &set, &oldset);
#ifndef __APPLE__
if( config_GetInt( p_this, "rt-priority" ) > 0 )
#endif
{
- int i_error, i_policy;
- struct sched_param param;
+ struct sched_param p = { .sched_priority = i_priority, };
+ int policy;
- memset( ¶m, 0, sizeof(struct sched_param) );
+ /* Hack to avoid error msg */
if( config_GetType( p_this, "rt-offset" ) )
- i_priority += config_GetInt( p_this, "rt-offset" );
- if( i_priority <= 0 )
- {
- param.sched_priority = (-1) * i_priority;
- i_policy = SCHED_OTHER;
- }
+ p.sched_priority += config_GetInt( p_this, "rt-offset" );
+ if( p.sched_priority <= 0 )
+ p.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
else
- {
- param.sched_priority = i_priority;
- i_policy = SCHED_RR;
- }
- if( (i_error = pthread_setschedparam( p_priv->thread_id,
- i_policy, ¶m )) )
- {
- errno = i_error;
- msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
- psz_file, i_line );
- i_priority = 0;
- }
+ p.sched_priority += sched_get_priority_min (policy = SCHED_RR);
+
+ pthread_attr_setschedpolicy (&attr, policy);
+ pthread_attr_setschedparam (&attr, &p);
}
-#ifndef __APPLE__
- else
- i_priority = 0;
-#endif
+
+ i_ret = pthread_create( &p_priv->thread_id, &attr, thread_entry, boot );
+ pthread_sigmask (SIG_SETMASK, &oldset, NULL);
+ pthread_attr_destroy (&attr);
#elif defined( WIN32 ) || defined( UNDER_CE )
- {
- /* 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) */
+ /* 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) */
#if defined( UNDER_CE )
- HANDLE hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)func,
- (LPVOID)p_data, CREATE_SUSPENDED,
- NULL );
+ HANDLE hThread = CreateThread( NULL, 0, thread_entry,
+ (LPVOID)boot, CREATE_SUSPENDED, NULL );
#else
- HANDLE hThread = (HANDLE)(uintptr_t)
- _beginthreadex( NULL, 0, (LPTHREAD_START_ROUTINE)func,
- (void *)p_data, CREATE_SUSPENDED, NULL );
+ HANDLE hThread = (HANDLE)(uintptr_t)
+ _beginthreadex( NULL, 0, thread_entry, boot, CREATE_SUSPENDED, NULL );
#endif
- p_priv->thread_id = hThread;
- ResumeThread(hThread);
- }
-
- i_ret = ( p_priv->thread_id ? 0 : errno );
-
- if( !i_ret && i_priority )
+ if( hThread )
{
- if( !SetThreadPriority(p_priv->thread_id, i_priority) )
+ p_priv->thread_id = hThread;
+ ResumeThread (hThread);
+ i_ret = 0;
+ if( i_priority && !SetThreadPriority (hThread, i_priority) )
{
msg_Warn( p_this, "couldn't set a faster priority" );
i_priority = 0;
}
}
+ else
+ i_ret = errno;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
- p_priv->thread_id = spawn_thread( (thread_func)func, psz_name,
+ p_priv->thread_id = spawn_thread( (thread_func)thread_entry, psz_name,
i_priority, p_data );
i_ret = resume_thread( p_priv->thread_id );
psz_name, psz_file, i_line );
}
- vlc_mutex_unlock( &p_this->object_lock );
+ vlc_object_unlock( p_this );
+
+ if (i_ret)
+ {
+ vlc_mutex_lock (&libpriv->threads_lock);
+ if (--libpriv->threads_count == 0)
+ vlc_cond_signal (&libpriv->threads_wait);
+ vlc_mutex_unlock (&libpriv->threads_lock);
+ }
return i_ret;
}
{
vlc_object_internals_t *p_priv = vlc_internals( p_this );
+ if( !p_priv->b_thread )
+ {
+ msg_Err( p_this, "couldn't set priority of non-existent thread" );
+ return ESRCH;
+ }
+
#if defined( LIBVLC_USE_PTHREAD )
# ifndef __APPLE__
if( config_GetInt( p_this, "rt-priority" ) > 0 )
param.sched_priority = i_priority;
i_policy = SCHED_RR;
}
- if( !p_priv->thread_id )
- p_priv->thread_id = pthread_self();
if( (i_error = pthread_setschedparam( p_priv->thread_id,
- i_policy, ¶m )) )
+ i_policy, ¶m )) )
{
errno = i_error;
msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
#elif defined( WIN32 ) || defined( UNDER_CE )
VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
- if( !p_priv->thread_id )
- p_priv->thread_id = GetCurrentThread();
if( !SetThreadPriority(p_priv->thread_id, i_priority) )
{
msg_Warn( p_this, "couldn't set a faster priority" );
return 0;
}
-/*****************************************************************************
- * vlc_thread_ready: tell the parent thread we were successfully spawned
- *****************************************************************************/
-void __vlc_thread_ready( vlc_object_t *p_this )
-{
- vlc_object_signal( p_this );
-}
-
/*****************************************************************************
* vlc_thread_join: wait until a thread exits, inner version
*****************************************************************************/
/* Make sure we do return if we are calling vlc_thread_join()
* from the joined thread */
if (pthread_equal (pthread_self (), p_priv->thread_id))
+ {
+ msg_Warn (p_this, "joining the active thread (VLC might crash)");
i_ret = pthread_detach (p_priv->thread_id);
+ }
else
i_ret = pthread_join (p_priv->thread_id, NULL);
projects / vlc / blobdiff