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/* libc-internal interface for mutex locks. LinuxThreads version.
Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _BITS_LIBC_LOCK_H
#define _BITS_LIBC_LOCK_H 1
#include <pthread.h>
/* Mutex type. */
#ifdef _LIBC
typedef pthread_mutex_t __libc_lock_t;
#else
typedef struct __libc_lock_opaque__ __libc_lock_t;
#endif
/* Type for key to thread-specific data. */
typedef pthread_key_t __libc_key_t;
/* Define a lock variable NAME with storage class CLASS. The lock must be
initialized with __libc_lock_init before it can be used (or define it
with __libc_lock_define_initialized, below). Use `extern' for CLASS to
declare a lock defined in another module. In public structure
definitions you must use a pointer to the lock structure (i.e., NAME
begins with a `*'), because its storage size will not be known outside
of libc. */
#define __libc_lock_define(CLASS,NAME) \
CLASS __libc_lock_t NAME;
/* Define an initialized lock variable NAME with storage class CLASS.
For the C library we take a deeper look at the initializer. For this
implementation all fields are initialized to zero. Therefore we
don't initialize the variable which allows putting it into the BSS
section. */
#define __libc_lock_define_initialized(CLASS,NAME) \
CLASS __libc_lock_t NAME;
/* Define an initialized recursive lock variable NAME with storage
class CLASS. */
#define __libc_lock_define_initialized_recursive(CLASS,NAME) \
CLASS __libc_lock_t NAME = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
/* Initialize the named lock variable, leaving it in a consistent, unlocked
state. */
#define __libc_lock_init(NAME) \
(__pthread_mutex_init != NULL ? __pthread_mutex_init (&(NAME), NULL) : 0);
/* Same as last but this time we initialize a recursive mutex. */
#define __libc_lock_init_recursive(NAME) \
do { \
if (__pthread_mutex_init != NULL) \
{ \
pthread_mutexattr_t __attr; \
__pthread_mutexattr_init (&__attr); \
__pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
__pthread_mutex_init (&(NAME), &__attr); \
__pthread_mutexattr_destroy (&__attr); \
} \
} while (0);
/* Finalize the named lock variable, which must be locked. It cannot be
used again until __libc_lock_init is called again on it. This must be
called on a lock variable before the containing storage is reused. */
#define __libc_lock_fini(NAME) \
(__pthread_mutex_destroy != NULL ? __pthread_mutex_destroy (&(NAME)) : 0);
/* Finalize recursive named lock. */
#define __libc_lock_fini_recursive(NAME) __libc_lock_fini (NAME)
/* Lock the named lock variable. */
#define __libc_lock_lock(NAME) \
(__pthread_mutex_lock != NULL ? __pthread_mutex_lock (&(NAME)) : 0);
/* Lock the recursive named lock variable. */
#define __libc_lock_lock_recursive(NAME) __libc_lock_lock (NAME)
/* Try to lock the named lock variable. */
#define __libc_lock_trylock(NAME) \
(__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (&(NAME)) : 0)
/* Try to lock the recursive named lock variable. */
#define __libc_lock_trylock_recursive(NAME) __libc_lock_trylock (NAME)
/* Unlock the named lock variable. */
#define __libc_lock_unlock(NAME) \
(__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (&(NAME)) : 0);
/* Unlock the recursive named lock variable. */
#define __libc_lock_unlock_recursive(NAME) __libc_lock_unlock (NAME)
/* 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 (__pthread_once != NULL) \
__pthread_once (&(ONCE_CONTROL), (INIT_FUNCTION)); \
else if ((ONCE_CONTROL) == 0) { \
INIT_FUNCTION (); \
(ONCE_CONTROL) = 1; \
} \
} while (0)
/* Start critical region with cleanup. */
#define __libc_cleanup_region_start(FCT, ARG) \
{ struct _pthread_cleanup_buffer _buffer; \
int _avail = _pthread_cleanup_push_defer != NULL; \
if (_avail) { \
_pthread_cleanup_push_defer (&_buffer, (FCT), (ARG)); \
}
/* End critical region with cleanup. */
#define __libc_cleanup_region_end(DOIT) \
if (_avail) { \
_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
} \
}
/* Sometimes we have to exit the block in the middle. */
#define __libc_cleanup_end(DOIT) \
if (_avail) { \
_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
}
/* Create thread-specific key. */
#define __libc_key_create(KEY, DESTRUCTOR) \
(__pthread_key_create != NULL ? __pthread_key_create (KEY, DESTRUCTOR) : 1)
/* Get thread-specific data. */
#define __libc_getspecific(KEY) \
(__pthread_getspecific != NULL ? __pthread_getspecific (KEY) : NULL)
/* Set thread-specific data. */
#define __libc_setspecific(KEY, VALUE) \
(__pthread_setspecific != NULL ? __pthread_setspecific (KEY, VALUE) : 0)
/* Register handlers to execute before and after `fork'. */
#define __libc_atfork(PREPARE, PARENT, CHILD) \
(__pthread_atfork != NULL ? __pthread_atfork (PREPARE, PARENT, CHILD) : 0)
/* Make the pthread functions weak so that we can elide them from
single-threaded processes. */
#ifndef __NO_WEAK_PTHREAD_ALIASES
# ifdef weak_extern
weak_extern (__pthread_mutex_init)
weak_extern (__pthread_mutex_destroy)
weak_extern (__pthread_mutex_lock)
weak_extern (__pthread_mutex_trylock)
weak_extern (__pthread_mutex_unlock)
weak_extern (__pthread_mutexattr_init)
weak_extern (__pthread_mutexattr_destroy)
weak_extern (__pthread_mutexattr_settype)
weak_extern (__pthread_key_create)
weak_extern (__pthread_setspecific)
weak_extern (__pthread_getspecific)
weak_extern (__pthread_once)
weak_extern (__pthread_initialize)
weak_extern (__pthread_atfork)
weak_extern (_pthread_cleanup_push_defer)
weak_extern (_pthread_cleanup_pop_restore)
# 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_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
# endif
#endif
/* We need portable names for some functions. E.g., when they are
used as argument to __libc_cleanup_region_start. */
#define __libc_mutex_unlock __pthread_mutex_unlock
#endif /* bits/libc-lock.h */
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