libc-lock.h

glibc 2.9,最新版的C语言库函数

	  }								      \
	else								      \
	  result = EBUSY;						      \
      }									      \
    else								      \
      ++(NAME).cnt;							      \
    result;								      \
  })
#else
# define __libc_lock_trylock_recursive(NAME) \
  __libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0)
#endif

#define __rtld_lock_trylock_recursive(NAME) \
  __libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)

/* Unlock the named lock variable.  */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# define __libc_lock_unlock(NAME) \
  lll_unlock (NAME, LLL_PRIVATE)
#else
# define __libc_lock_unlock(NAME) \
  __libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0)
#endif
#define __libc_rwlock_unlock(NAME) \
  __libc_ptf_call (__pthread_rwlock_unlock, (&(NAME)), 0)

/* Unlock the recursive named lock variable.  */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
/* We do no error checking here.  */
# define __libc_lock_unlock_recursive(NAME) \
  do {									      \
    if (--(NAME).cnt == 0)						      \
      {									      \
	(NAME).owner = NULL;						      \
	lll_unlock ((NAME).lock, LLL_PRIVATE);				      \
      }									      \
  } while (0)
#else
# define __libc_lock_unlock_recursive(NAME) \
  __libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0)
#endif

#if defined _LIBC && defined SHARED
# define __rtld_lock_default_lock_recursive(lock) \
  ++((pthread_mutex_t *)(lock))->__data.__count;

# define __rtld_lock_default_unlock_recursive(lock) \
  --((pthread_mutex_t *)(lock))->__data.__count;

# define __rtld_lock_lock_recursive(NAME) \
  GL(dl_rtld_lock_recursive) (&(NAME).mutex)

# define __rtld_lock_unlock_recursive(NAME) \
  GL(dl_rtld_unlock_recursive) (&(NAME).mutex)
#else
# define __rtld_lock_lock_recursive(NAME) \
  __libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)

# define __rtld_lock_unlock_recursive(NAME) \
  __libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0)
#endif

/* Define once control variable.  */
#if PTHREAD_ONCE_INIT == 0
/* Special case for static variables where we can avoid the initialization
   if it is zero.  */
# define __libc_once_define(CLASS, NAME) \
  CLASS pthread_once_t NAME
#else
# define __libc_once_define(CLASS, NAME) \
  CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT
#endif

/* Call handler iff the first call.  */
#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
  do {									      \
    if (PTFAVAIL (__pthread_once))					      \
      __libc_ptf_call_always (__pthread_once, (&(ONCE_CONTROL),		      \
					       INIT_FUNCTION));		      \
    else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) {			      \
      INIT_FUNCTION ();							      \
      (ONCE_CONTROL) |= 2;						      \
    }									      \
  } while (0)


/* Note that for I/O cleanup handling we are using the old-style
   cancel handling.  It does not have to be integrated with C++ snce
   no C++ code is called in the middle.  The old-style handling is
   faster and the support is not going away.  */
extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
                                   void (*routine) (void *), void *arg);
extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
                                  int execute);
extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
                                         void (*routine) (void *), void *arg);
extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
                                          int execute);

/* Start critical region with cleanup.  */
#define __libc_cleanup_region_start(DOIT, FCT, ARG) \
  { struct _pthread_cleanup_buffer _buffer;				      \
    int _avail;								      \
    if (DOIT) {								      \
      _avail = PTFAVAIL (_pthread_cleanup_push_defer);			      \
      if (_avail) {							      \
	__libc_ptf_call_always (_pthread_cleanup_push_defer, (&_buffer, FCT,  \
							      ARG));	      \
      } else {								      \
	_buffer.__routine = (FCT);					      \
	_buffer.__arg = (ARG);						      \
      }									      \
    } else {								      \
      _avail = 0;							      \
    }

/* End critical region with cleanup.  */
#define __libc_cleanup_region_end(DOIT) \
    if (_avail) {							      \
      __libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
    } else if (DOIT)							      \
      _buffer.__routine (_buffer.__arg);				      \
  }

/* Sometimes we have to exit the block in the middle.  */
#define __libc_cleanup_end(DOIT) \
    if (_avail) {							      \
      __libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
    } else if (DOIT)							      \
      _buffer.__routine (_buffer.__arg)


/* Normal cleanup handling, based on C cleanup attribute.  */
__extern_inline void
__libc_cleanup_routine (struct __pthread_cleanup_frame *f)
{
  if (f->__do_it)
    f->__cancel_routine (f->__cancel_arg);
}

#define __libc_cleanup_push(fct, arg) \
  do {									      \
    struct __pthread_cleanup_frame __clframe				      \
      __attribute__ ((__cleanup__ (__libc_cleanup_routine)))		      \
      = { .__cancel_routine = (fct), .__cancel_arg = (arg),		      \
          .__do_it = 1 };

#define __libc_cleanup_pop(execute) \
    __clframe.__do_it = (execute);					      \
  } while (0)


/* Create thread-specific key.  */
#define __libc_key_create(KEY, DESTRUCTOR) \
  __libc_ptf_call (__pthread_key_create, (KEY, DESTRUCTOR), 1)

/* Get thread-specific data.  */
#define __libc_getspecific(KEY) \
  __libc_ptf_call (__pthread_getspecific, (KEY), NULL)

/* Set thread-specific data.  */
#define __libc_setspecific(KEY, VALUE) \
  __libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0)


/* Register handlers to execute before and after `fork'.  Note that the
   last parameter is NULL.  The handlers registered by the libc are
   never removed so this is OK.  */
#define __libc_atfork(PREPARE, PARENT, CHILD) \
  __register_atfork (PREPARE, PARENT, CHILD, NULL)
extern int __register_atfork (void (*__prepare) (void),
			      void (*__parent) (void),
			      void (*__child) (void),
			      void *__dso_handle);

/* Functions that are used by this file and are internal to the GNU C
   library.  */

extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
				 __const pthread_mutexattr_t *__mutex_attr);

extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);

extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);

extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);

extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);

extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr);

extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr);

extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr,
					int __kind);

#ifdef __USE_UNIX98
extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock,
				  __const pthread_rwlockattr_t *__attr);

extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);

extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);

extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);

extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);

extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);

extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
#endif

extern int __pthread_key_create (pthread_key_t *__key,
				 void (*__destr_function) (void *));

extern int __pthread_setspecific (pthread_key_t __key,
				  __const void *__pointer);

extern void *__pthread_getspecific (pthread_key_t __key);

extern int __pthread_once (pthread_once_t *__once_control,
			   void (*__init_routine) (void));

extern int __pthread_atfork (void (*__prepare) (void),
			     void (*__parent) (void),
			     void (*__child) (void));



/* Make the pthread functions weak so that we can elide them from
   single-threaded processes.  */
#ifndef __NO_WEAK_PTHREAD_ALIASES
# ifdef weak_extern
#  if _LIBC
#   include <bp-sym.h>
#  else
#   define BP_SYM (sym) sym
#  endif
weak_extern (BP_SYM (__pthread_mutex_init))
weak_extern (BP_SYM (__pthread_mutex_destroy))
weak_extern (BP_SYM (__pthread_mutex_lock))
weak_extern (BP_SYM (__pthread_mutex_trylock))
weak_extern (BP_SYM (__pthread_mutex_unlock))
weak_extern (BP_SYM (__pthread_mutexattr_init))
weak_extern (BP_SYM (__pthread_mutexattr_destroy))
weak_extern (BP_SYM (__pthread_mutexattr_settype))
weak_extern (BP_SYM (__pthread_rwlock_init))
weak_extern (BP_SYM (__pthread_rwlock_destroy))
weak_extern (BP_SYM (__pthread_rwlock_rdlock))
weak_extern (BP_SYM (__pthread_rwlock_tryrdlock))
weak_extern (BP_SYM (__pthread_rwlock_wrlock))
weak_extern (BP_SYM (__pthread_rwlock_trywrlock))
weak_extern (BP_SYM (__pthread_rwlock_unlock))
weak_extern (BP_SYM (__pthread_key_create))
weak_extern (BP_SYM (__pthread_setspecific))
weak_extern (BP_SYM (__pthread_getspecific))
weak_extern (BP_SYM (__pthread_once))
weak_extern (__pthread_initialize)
weak_extern (__pthread_atfork)
weak_extern (BP_SYM (_pthread_cleanup_push_defer))
weak_extern (BP_SYM (_pthread_cleanup_pop_restore))
weak_extern (BP_SYM (pthread_setcancelstate))
# else
#  pragma weak __pthread_mutex_init
#  pragma weak __pthread_mutex_destroy
#  pragma weak __pthread_mutex_lock
#  pragma weak __pthread_mutex_trylock
#  pragma weak __pthread_mutex_unlock
#  pragma weak __pthread_mutexattr_init
#  pragma weak __pthread_mutexattr_destroy
#  pragma weak __pthread_mutexattr_settype
#  pragma weak __pthread_rwlock_destroy
#  pragma weak __pthread_rwlock_rdlock
#  pragma weak __pthread_rwlock_tryrdlock
#  pragma weak __pthread_rwlock_wrlock
#  pragma weak __pthread_rwlock_trywrlock
#  pragma weak __pthread_rwlock_unlock
#  pragma weak __pthread_key_create
#  pragma weak __pthread_setspecific
#  pragma weak __pthread_getspecific
#  pragma weak __pthread_once
#  pragma weak __pthread_initialize
#  pragma weak __pthread_atfork
#  pragma weak _pthread_cleanup_push_defer
#  pragma weak _pthread_cleanup_pop_restore
#  pragma weak pthread_setcancelstate
# endif
#endif

#endif	/* bits/libc-lock.h */