NetBSD/gnu/dist/libio/config/linuxaxp1-libc-lock.h

113 lines
4.9 KiB
C

/* libc-internal interface for mutex locks. LinuxThreads version.
Copyright (C) 1996 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 _LIBC_LOCK_H
#define _LIBC_LOCK_H 1
#include <pthread.h>
#define __libc_lock_t pthread_mutex_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. */
#define __libc_lock_define_initialized(CLASS,NAME) \
CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER;
/* 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_setkind_np (&__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);
/* Lock the named lock variable. */
#define __libc_lock_lock(NAME) \
(__pthread_mutex_lock != NULL ? __pthread_mutex_lock (&(NAME)) : 0);
/* Try to lock the named lock variable. */
#define __libc_lock_trylock(NAME) \
(__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (&(NAME)) : 0);
/* Unlock the named lock variable. */
#define __libc_lock_unlock(NAME) \
(__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (&(NAME)) : 0);
/* Start critical region with cleanup. */
#define __libc_cleanup_region_start(FCT, ARG) \
{ struct _pthread_cleanup_buffer _buffer; \
if (_pthread_cleanup_push_defer != NULL) { \
_pthread_cleanup_push_defer (&_buffer, (FCT), (ARG)); \
}
/* End critical region with cleanup. */
#define __libc_cleanup_region_end(DOIT) \
if (_pthread_cleanup_push_defer != NULL) { \
_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
} \
}
/* Make the pthread functions weak so that we can elide them from
single-threaded processes. */
#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_setkind_np
#pragma weak __pthread_key_create
#pragma weak __pthread_setspecific
#pragma weak __pthread_getspecific
#pragma weak __pthread_initialize
#pragma weak _pthread_cleanup_push_defer
#pragma weak _pthread_cleanup_pop_restore
/* 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 /* libc-lock.h */