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videolan
vlc-2-2
Commits
1c3973d7
Commit
1c3973d7
authored
Dec 27, 2013
by
Felix Paul Kühne
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src: split darwin threading code from the generic posix implementation
parent
5c73acee
Changes
3
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3 changed files
with
821 additions
and
32 deletions
+821
-32
src/Makefile.am
src/Makefile.am
+1
-1
src/darwin/thread.c
src/darwin/thread.c
+820
-0
src/posix/thread.c
src/posix/thread.c
+0
-31
No files found.
src/Makefile.am
View file @
1c3973d7
...
...
@@ -248,7 +248,7 @@ SOURCES_libvlc_darwin = \
darwin/dirs.c
\
posix/filesystem.c
\
posix/plugin.c
\
posix
/thread.c
\
darwin
/thread.c
\
posix/timer.c
\
darwin/specific.c
\
posix/rand.c
\
...
...
src/darwin/thread.c
0 → 100644
View file @
1c3973d7
/*****************************************************************************
* thread.c : pthread back-end for LibVLC
*****************************************************************************
* Copyright (C) 1999-2013 VLC authors and VideoLAN
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
* Gildas Bazin <gbazin@netcourrier.com>
* Clément Sténac
* Rémi Denis-Courmont
* Felix Paul Kühne <fkuehne # videolan.org>
*
* 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 Lesser General Public License for more details.
*
* 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.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_atomic.h>
#include "libvlc.h"
#include <stdarg.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#include <sys/types.h>
#include <unistd.h>
/* fsync() */
#include <pthread.h>
#include <sched.h>
#include <mach/mach_init.h>
/* mach_task_self in semaphores */
#include <execinfo.h>
#include <sys/time.h>
/* gettimeofday() */
#define vlc_clock_setup() (void)0
#warning Monotonic clock not available. Expect timing issues.
static
struct
timespec
mtime_to_ts
(
mtime_t
date
)
{
lldiv_t
d
=
lldiv
(
date
,
CLOCK_FREQ
);
struct
timespec
ts
=
{
d
.
quot
,
d
.
rem
*
(
1000000000
/
CLOCK_FREQ
)
};
return
ts
;
}
/**
* 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
fsync
(
2
);
}
static
inline
unsigned
long
vlc_threadid
(
void
)
{
union
{
pthread_t
th
;
unsigned
long
int
i
;
}
v
=
{
};
v
.
th
=
pthread_self
();
return
v
.
i
;
}
#ifndef NDEBUG
/**
* Reports a fatal error from the threading layer, for debugging purposes.
*/
static
void
vlc_thread_fatal
(
const
char
*
action
,
int
error
,
const
char
*
function
,
const
char
*
file
,
unsigned
line
)
{
int
canc
=
vlc_savecancel
();
fprintf
(
stderr
,
"LibVLC fatal error %s (%d) in thread %lu "
,
action
,
error
,
vlc_threadid
());
vlc_trace
(
function
,
file
,
line
);
char
buf
[
1000
];
const
char
*
msg
;
switch
(
strerror_r
(
error
,
buf
,
sizeof
(
buf
)))
{
case
0
:
msg
=
buf
;
break
;
case
ERANGE
:
/* should never happen */
msg
=
"unknown (too big to display)"
;
break
;
default:
msg
=
"unknown (invalid error number)"
;
break
;
}
fprintf
(
stderr
,
" Error message: %s
\n
"
,
msg
);
fflush
(
stderr
);
vlc_restorecancel
(
canc
);
abort
();
}
# define VLC_THREAD_ASSERT( action ) \
if (unlikely(val)) \
vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
#else
# define VLC_THREAD_ASSERT( action ) ((void)val)
#endif
/**
* Initializes a fast mutex.
*/
void
vlc_mutex_init
(
vlc_mutex_t
*
p_mutex
)
{
pthread_mutexattr_t
attr
;
if
(
unlikely
(
pthread_mutexattr_init
(
&
attr
)))
abort
();
#ifdef NDEBUG
pthread_mutexattr_settype
(
&
attr
,
PTHREAD_MUTEX_DEFAULT
);
#else
pthread_mutexattr_settype
(
&
attr
,
PTHREAD_MUTEX_ERRORCHECK
);
#endif
if
(
unlikely
(
pthread_mutex_init
(
p_mutex
,
&
attr
)))
abort
();
pthread_mutexattr_destroy
(
&
attr
);
}
/**
* Initializes a recursive mutex.
* \warning This is strongly discouraged. Please use normal mutexes.
*/
void
vlc_mutex_init_recursive
(
vlc_mutex_t
*
p_mutex
)
{
pthread_mutexattr_t
attr
;
if
(
unlikely
(
pthread_mutexattr_init
(
&
attr
)))
abort
();
pthread_mutexattr_settype
(
&
attr
,
PTHREAD_MUTEX_RECURSIVE
);
if
(
unlikely
(
pthread_mutex_init
(
p_mutex
,
&
attr
)))
abort
();
pthread_mutexattr_destroy
(
&
attr
);
}
/**
* 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
)
{
int
val
=
pthread_mutex_destroy
(
p_mutex
);
VLC_THREAD_ASSERT
(
"destroying mutex"
);
}
#ifndef NDEBUG
# ifdef HAVE_VALGRIND_VALGRIND_H
# include <valgrind/valgrind.h>
# else
# define RUNNING_ON_VALGRIND (0)
# endif
/**
* Asserts that a mutex is locked by the calling thread.
*/
void
vlc_assert_locked
(
vlc_mutex_t
*
p_mutex
)
{
if
(
RUNNING_ON_VALGRIND
>
0
)
return
;
assert
(
pthread_mutex_lock
(
p_mutex
)
==
EDEADLK
);
}
#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.
* This function is not a cancellation-point.
*
* @param p_mutex mutex initialized with vlc_mutex_init() or
* vlc_mutex_init_recursive()
*/
void
vlc_mutex_lock
(
vlc_mutex_t
*
p_mutex
)
{
int
val
=
pthread_mutex_lock
(
p_mutex
);
VLC_THREAD_ASSERT
(
"locking mutex"
);
}
/**
* Acquires a mutex if and only if it is not currently held by another thread.
* This function never sleeps and can be used in delay-critical code paths.
* This function is not a cancellation-point.
*
* <b>Beware</b>: If this function fails, then the mutex is held... by another
* thread. The calling thread must deal with the error appropriately. That
* typically implies postponing the operations that would have required the
* mutex. If the thread cannot defer those operations, then it must use
* vlc_mutex_lock(). If in doubt, use vlc_mutex_lock() instead.
*
* @param p_mutex mutex initialized with vlc_mutex_init() or
* vlc_mutex_init_recursive()
* @return 0 if the mutex could be acquired, an error code otherwise.
*/
int
vlc_mutex_trylock
(
vlc_mutex_t
*
p_mutex
)
{
int
val
=
pthread_mutex_trylock
(
p_mutex
);
if
(
val
!=
EBUSY
)
VLC_THREAD_ASSERT
(
"locking mutex"
);
return
val
;
}
/**
* 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
)
{
int
val
=
pthread_mutex_unlock
(
p_mutex
);
VLC_THREAD_ASSERT
(
"unlocking mutex"
);
}
/**
* Initializes a condition variable.
*/
void
vlc_cond_init
(
vlc_cond_t
*
p_condvar
)
{
pthread_condattr_t
attr
;
if
(
unlikely
(
pthread_condattr_init
(
&
attr
)))
abort
();
if
(
unlikely
(
pthread_cond_init
(
p_condvar
,
&
attr
)))
abort
();
pthread_condattr_destroy
(
&
attr
);
}
/**
* Initializes a condition variable.
* Contrary to vlc_cond_init(), the wall clock will be used as a reference for
* the vlc_cond_timedwait() time-out parameter.
*/
void
vlc_cond_init_daytime
(
vlc_cond_t
*
p_condvar
)
{
if
(
unlikely
(
pthread_cond_init
(
p_condvar
,
NULL
)))
abort
();
}
/**
* 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
)
{
int
val
=
pthread_cond_destroy
(
p_condvar
);
/* due to a faulty pthread implementation within Darwin 11 and
* later condition variables cannot be destroyed without
* terminating the application immediately.
* This Darwin kernel issue is still present in version 13
* and might not be resolved prior to Darwin 15.
* radar://12496249
*
* To work-around this, we are just leaking the condition variable
* which is acceptable due to VLC's low number of created variables
* and its usually limited runtime.
* Ideally, we should implement a re-useable pool.
*/
if
(
val
!=
0
)
{
#ifndef NDEBUG
printf
(
"pthread_cond_destroy returned %i
\n
"
,
val
);
#endif
if
(
val
==
EBUSY
)
return
;
}
VLC_THREAD_ASSERT
(
"destroying condition"
);
}
/**
* 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
)
{
int
val
=
pthread_cond_signal
(
p_condvar
);
VLC_THREAD_ASSERT
(
"signaling condition variable"
);
}
/**
* 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
)
{
pthread_cond_broadcast
(
p_condvar
);
}
/**
* 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
*/
void
vlc_cond_wait
(
vlc_cond_t
*
p_condvar
,
vlc_mutex_t
*
p_mutex
)
{
int
val
=
pthread_cond_wait
(
p_condvar
,
p_mutex
);
VLC_THREAD_ASSERT
(
"waiting on condition"
);
}
/**
* Waits for a condition variable up to a certain date.
* This works like vlc_cond_wait(), except for the additional time-out.
*
* If the variable was initialized with vlc_cond_init(), the timeout has the
* same arbitrary origin as mdate(). If the variable was initialized with
* vlc_cond_init_daytime(), the timeout is expressed from the Unix epoch.
*
* @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
)
{
struct
timespec
ts
=
mtime_to_ts
(
deadline
);
int
val
=
pthread_cond_timedwait
(
p_condvar
,
p_mutex
,
&
ts
);
if
(
val
!=
ETIMEDOUT
)
VLC_THREAD_ASSERT
(
"timed-waiting on condition"
);
return
val
;
}
/**
* Initializes a semaphore.
*/
void
vlc_sem_init
(
vlc_sem_t
*
sem
,
unsigned
value
)
{
if
(
unlikely
(
semaphore_create
(
mach_task_self
(),
sem
,
SYNC_POLICY_FIFO
,
value
)
!=
KERN_SUCCESS
))
abort
();
}
/**
* Destroys a semaphore.
*/
void
vlc_sem_destroy
(
vlc_sem_t
*
sem
)
{
int
val
;
if
(
likely
(
semaphore_destroy
(
mach_task_self
(),
*
sem
)
==
KERN_SUCCESS
))
return
;
val
=
EINVAL
;
VLC_THREAD_ASSERT
(
"destroying semaphore"
);
}
/**
* Increments the value of a semaphore.
* @return 0 on success, EOVERFLOW in case of integer overflow
*/
int
vlc_sem_post
(
vlc_sem_t
*
sem
)
{
int
val
;
if
(
likely
(
semaphore_signal
(
*
sem
)
==
KERN_SUCCESS
))
return
0
;
val
=
EINVAL
;
if
(
unlikely
(
val
!=
EOVERFLOW
))
VLC_THREAD_ASSERT
(
"unlocking semaphore"
);
return
val
;
}
/**
* Atomically wait for the semaphore to become non-zero (if needed),
* then decrements it.
*/
void
vlc_sem_wait
(
vlc_sem_t
*
sem
)
{
int
val
;
if
(
likely
(
semaphore_wait
(
*
sem
)
==
KERN_SUCCESS
))
return
;
val
=
EINVAL
;
VLC_THREAD_ASSERT
(
"locking semaphore"
);
}
/**
* Initializes a read/write lock.
*/
void
vlc_rwlock_init
(
vlc_rwlock_t
*
lock
)
{
if
(
unlikely
(
pthread_rwlock_init
(
lock
,
NULL
)))
abort
();
}
/**
* Destroys an initialized unused read/write lock.
*/
void
vlc_rwlock_destroy
(
vlc_rwlock_t
*
lock
)
{
int
val
=
pthread_rwlock_destroy
(
lock
);
VLC_THREAD_ASSERT
(
"destroying R/W lock"
);
}
/**
* Acquires a read/write lock for reading. Recursion is allowed.
* @note This function may be a point of cancellation.
*/
void
vlc_rwlock_rdlock
(
vlc_rwlock_t
*
lock
)
{
int
val
=
pthread_rwlock_rdlock
(
lock
);
VLC_THREAD_ASSERT
(
"acquiring R/W lock for reading"
);
}
/**
* Acquires a read/write lock for writing. Recursion is not allowed.
* @note This function may be a point of cancellation.
*/
void
vlc_rwlock_wrlock
(
vlc_rwlock_t
*
lock
)
{
int
val
=
pthread_rwlock_wrlock
(
lock
);
VLC_THREAD_ASSERT
(
"acquiring R/W lock for writing"
);
}
/**
* Releases a read/write lock.
*/
void
vlc_rwlock_unlock
(
vlc_rwlock_t
*
lock
)
{
int
val
=
pthread_rwlock_unlock
(
lock
);
VLC_THREAD_ASSERT
(
"releasing R/W lock"
);
}
/**
* Allocates a thread-specific variable.
* @param key where to store the thread-specific variable handle
* @param destr a destruction callback. It is called whenever a thread exits
* and the thread-specific variable has a non-NULL value.
* @return 0 on success, a system error code otherwise. This function can
* actually fail because there is a fixed limit on the number of
* thread-specific variable in a process on most systems.
*/
int
vlc_threadvar_create
(
vlc_threadvar_t
*
key
,
void
(
*
destr
)
(
void
*
))
{
return
pthread_key_create
(
key
,
destr
);
}
void
vlc_threadvar_delete
(
vlc_threadvar_t
*
p_tls
)
{
pthread_key_delete
(
*
p_tls
);
}
/**
* Sets a thread-specific variable.
* @param key thread-local variable key (created with vlc_threadvar_create())
* @param value new value for the variable for the calling thread
* @return 0 on success, a system error code otherwise.
*/
int
vlc_threadvar_set
(
vlc_threadvar_t
key
,
void
*
value
)
{
return
pthread_setspecific
(
key
,
value
);
}
/**
* Gets the value of a thread-local variable for the calling thread.
* This function cannot fail.
* @return the value associated with the given variable for the calling
* or NULL if there is no value.
*/
void
*
vlc_threadvar_get
(
vlc_threadvar_t
key
)
{
return
pthread_getspecific
(
key
);
}
static
bool
rt_priorities
=
false
;
static
int
rt_offset
;
void
vlc_threads_setup
(
libvlc_int_t
*
p_libvlc
)
{
static
vlc_mutex_t
lock
=
VLC_STATIC_MUTEX
;
static
bool
initialized
=
false
;
vlc_mutex_lock
(
&
lock
);
/* Initializes real-time priorities before any thread is created,
* just once per process. */
if
(
!
initialized
)
{
rt_offset
=
var_InheritInteger
(
p_libvlc
,
"rt-offset"
);
rt_priorities
=
true
;
initialized
=
true
;
}
vlc_mutex_unlock
(
&
lock
);
}
static
int
vlc_clone_attr
(
vlc_thread_t
*
th
,
pthread_attr_t
*
attr
,
void
*
(
*
entry
)
(
void
*
),
void
*
data
,
int
priority
)
{
int
ret
;
/* 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
oldset
;
{
sigset_t
set
;
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
);
}
(
void
)
priority
;
/* The thread stack size.
* The lower the value, the less address space per thread, the highest
* maximum simultaneous threads per process. Too low values will cause
* stack overflows and weird crashes. Set with caution. Also keep in mind
* that 64-bits platforms consume more stack than 32-bits one.
*
* Thanks to on-demand paging, thread stack size only affects address space
* consumption. In terms of memory, threads only use what they need
* (rounded up to the page boundary).
*
* For example, on Linux i386, the default is 2 mega-bytes, which supports
* about 320 threads per processes. */
#define VLC_STACKSIZE (128 * sizeof (void *) * 1024)
#ifdef VLC_STACKSIZE
ret
=
pthread_attr_setstacksize
(
attr
,
VLC_STACKSIZE
);
assert
(
ret
==
0
);
/* fails iif VLC_STACKSIZE is invalid */
#endif
ret
=
pthread_create
(
th
,
attr
,
entry
,
data
);
pthread_sigmask
(
SIG_SETMASK
,
&
oldset
,
NULL
);
pthread_attr_destroy
(
attr
);
return
ret
;
}
/**
* Creates and starts new thread.
*
* The thread must be <i>joined</i> with vlc_join() to reclaim resources
* when it is not needed anymore.
*
* @param th [OUT] pointer to write the handle of the created thread to
* (mandatory, must be non-NULL)
* @param entry entry point for the thread
* @param data data parameter given to the entry point
* @param priority thread priority value
* @return 0 on success, a standard error code on error.
*/
int
vlc_clone
(
vlc_thread_t
*
th
,
void
*
(
*
entry
)
(
void
*
),
void
*
data
,
int
priority
)
{
pthread_attr_t
attr
;
pthread_attr_init
(
&
attr
);
return
vlc_clone_attr
(
th
,
&
attr
,
entry
,
data
,
priority
);
}
/**
* Waits for a thread to complete (if needed), then destroys it.
* This is a cancellation point; in case of cancellation, the join does _not_
* occur.
* @warning
* A thread cannot join itself (normally VLC will abort if this is attempted).
* Also, a detached thread <b>cannot</b> be joined.
*
* @param handle thread handle
* @param p_result [OUT] pointer to write the thread return value or NULL
*/
void
vlc_join
(
vlc_thread_t
handle
,
void
**
result
)
{
int
val
=
pthread_join
(
handle
,
result
);
VLC_THREAD_ASSERT
(
"joining thread"
);
}
/**
* Creates and starts new detached thread.
* A detached thread cannot be joined. Its resources will be automatically
* released whenever the thread exits (in particular, its call stack will be
* reclaimed).
*
* Detached thread are particularly useful when some work needs to be done
* asynchronously, that is likely to be completed much earlier than the thread
* can practically be joined. In this case, thread detach can spare memory.
*
* A detached thread may be cancelled, so as to expedite its termination.
* Be extremely careful if you do this: while a normal joinable thread can
* safely be cancelled after it has already exited, cancelling an already
* exited detached thread is undefined: The thread handle would is destroyed
* immediately when the detached thread exits. So you need to ensure that the
* detached thread is still running before cancellation is attempted.
*
* @warning Care must be taken that any resources used by the detached thread
* remains valid until the thread completes.
*
* @note A detached thread must eventually exit just like another other
* thread. In practice, LibVLC will wait for detached threads to exit before
* it unloads the plugins.
*
* @param th [OUT] pointer to hold the thread handle, or NULL
* @param entry entry point for the thread
* @param data data parameter given to the entry point
* @param priority thread priority value
* @return 0 on success, a standard error code on error.
*/
int
vlc_clone_detach
(
vlc_thread_t
*
th
,
void
*
(
*
entry
)
(
void
*
),
void
*
data
,
int
priority
)
{
vlc_thread_t
dummy
;
pthread_attr_t
attr
;
if
(
th
==
NULL
)
th
=
&
dummy
;
pthread_attr_init
(
&
attr
);
pthread_attr_setdetachstate
(
&
attr
,
PTHREAD_CREATE_DETACHED
);
return
vlc_clone_attr
(
th
,
&
attr
,
entry
,
data
,
priority
);
}
int
vlc_set_priority
(
vlc_thread_t
th
,
int
priority
)
{
(
void
)
th
;
(
void
)
priority
;
return
VLC_SUCCESS
;
}
/**
* Marks a thread as cancelled. Next time the target thread reaches a
* cancellation point (while not having disabled cancellation), it will
* run its cancellation cleanup handler, the thread variable destructors, and
* terminate. vlc_join() must be used afterward regardless of a thread being
* cancelled or not.
*/
void
vlc_cancel
(
vlc_thread_t
thread_id
)
{
pthread_cancel
(
thread_id
);
}
/**
* Save the current cancellation state (enabled or disabled), then disable
* cancellation for the calling thread.
* This function must be called before entering a piece of code that is not
* cancellation-safe, unless it can be proven that the calling thread will not
* be cancelled.
* @return Previous cancellation state (opaque value for vlc_restorecancel()).
*/
int
vlc_savecancel
(
void
)
{
int
state
;
int
val
=
pthread_setcancelstate
(
PTHREAD_CANCEL_DISABLE
,
&
state
);
VLC_THREAD_ASSERT
(
"saving cancellation"
);
return
state
;
}
/**
* Restore the cancellation state for the calling thread.
* @param state previous state as returned by vlc_savecancel().
* @return Nothing, always succeeds.
*/
void
vlc_restorecancel
(
int
state
)
{
#ifndef NDEBUG
int
oldstate
,
val
;
val
=
pthread_setcancelstate
(
state
,
&
oldstate
);
/* This should fail if an invalid value for given for state */
VLC_THREAD_ASSERT
(
"restoring cancellation"
);
if
(
unlikely
(
oldstate
!=
PTHREAD_CANCEL_DISABLE
))
vlc_thread_fatal
(
"restoring cancellation while not disabled"
,
EINVAL
,
__func__
,
__FILE__
,
__LINE__
);
#else
pthread_setcancelstate
(
state
,
NULL
);
#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.
* This is also used to force a cancellation point in a function that would
* otherwise "not always" be a one (block_FifoGet() is an example).
*/
void
vlc_testcancel
(
void
)
{
pthread_testcancel
();
}
void
vlc_control_cancel
(
int
cmd
,
...)
{
(
void
)
cmd
;
assert
(
0
);
}
/**
* Precision monotonic clock.
*
* In principles, the clock has a precision of 1 MHz. But the actual resolution
* may be much lower, especially when it comes to sleeping with mwait() or
* msleep(). Most general-purpose operating systems provide a resolution of
* only 100 to 1000 Hz.
*
* @warning The origin date (time value "zero") is not specified. It is
* typically the time the kernel started, but this is platform-dependent.
* If you need wall clock time, use gettimeofday() instead.
*
* @return a timestamp in microseconds.
*/
mtime_t
mdate
(
void
)
{
struct
timeval
tv
;
if
(
unlikely
(
gettimeofday
(
&
tv
,
NULL
)
!=
0
))
abort
();
return
(
INT64_C
(
1000000
)
*
tv
.
tv_sec
)
+
tv
.
tv_usec
;
}
#undef mwait
/**
* Waits until a deadline (possibly later due to OS scheduling).
* @param deadline timestamp to wait for (see mdate())
*/
void
mwait
(
mtime_t
deadline
)
{
deadline
-=
mdate
();
if
(
deadline
>
0
)
msleep
(
deadline
);
}
#undef msleep
/**
* Waits for an interval of time.
* @param delay how long to wait (in microseconds)
*/
void
msleep
(
mtime_t
delay
)
{
struct
timespec
ts
=
mtime_to_ts
(
delay
);
while
(
nanosleep
(
&
ts
,
&
ts
)
==
-
1
)
assert
(
errno
==
EINTR
);
}
/**
* Count CPUs.
* @return number of available (logical) CPUs.
*/
unsigned
vlc_GetCPUCount
(
void
)
{
return
sysconf
(
_SC_NPROCESSORS_CONF
);
}
src/posix/thread.c
View file @
1c3973d7
...
...
@@ -49,9 +49,6 @@
#ifdef HAVE_EXECINFO_H
# include <execinfo.h>
#endif
#ifdef __APPLE__
# include <mach/mach_init.h>
/* mach_task_self in semaphores */
#endif
#if defined(__SunOS)
# include <sys/processor.h>
# include <sys/pset.h>
...
...
@@ -445,13 +442,8 @@ int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
*/
void
vlc_sem_init
(
vlc_sem_t
*
sem
,
unsigned
value
)
{
#if defined(__APPLE__)
if
(
unlikely
(
semaphore_create
(
mach_task_self
(),
sem
,
SYNC_POLICY_FIFO
,
value
)
!=
KERN_SUCCESS
))
abort
();
#else
if
(
unlikely
(
sem_init
(
sem
,
0
,
value
)))
abort
();
#endif
}
/**
...
...
@@ -461,17 +453,10 @@ void vlc_sem_destroy (vlc_sem_t *sem)
{
int
val
;
#if defined(__APPLE__)
if
(
likely
(
semaphore_destroy
(
mach_task_self
(),
*
sem
)
==
KERN_SUCCESS
))
return
;
val
=
EINVAL
;
#else
if
(
likely
(
sem_destroy
(
sem
)
==
0
))
return
;
val
=
errno
;
#endif
VLC_THREAD_ASSERT
(
"destroying semaphore"
);
}
...
...
@@ -484,17 +469,10 @@ int vlc_sem_post (vlc_sem_t *sem)
{
int
val
;
#if defined(__APPLE__)
if
(
likely
(
semaphore_signal
(
*
sem
)
==
KERN_SUCCESS
))
return
0
;
val
=
EINVAL
;
#else
if
(
likely
(
sem_post
(
sem
)
==
0
))
return
0
;
val
=
errno
;
#endif
if
(
unlikely
(
val
!=
EOVERFLOW
))
VLC_THREAD_ASSERT
(
"unlocking semaphore"
);
...
...
@@ -509,17 +487,10 @@ void vlc_sem_wait (vlc_sem_t *sem)
{
int
val
;
#if defined(__APPLE__)
if
(
likely
(
semaphore_wait
(
*
sem
)
==
KERN_SUCCESS
))
return
;
val
=
EINVAL
;
#else
do
if
(
likely
(
sem_wait
(
sem
)
==
0
))
return
;
while
((
val
=
errno
)
==
EINTR
);
#endif
VLC_THREAD_ASSERT
(
"locking semaphore"
);
}
...
...
@@ -625,9 +596,7 @@ void vlc_threads_setup (libvlc_int_t *p_libvlc)
* just once per process. */
if
(
!
initialized
)
{
#ifndef __APPLE__
if
(
var_InheritBool
(
p_libvlc
,
"rt-priority"
))
#endif
{
rt_offset
=
var_InheritInteger
(
p_libvlc
,
"rt-offset"
);
rt_priorities
=
true
;
...
...
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