146 lines
5.3 KiB
C
146 lines
5.3 KiB
C
/* libc-internal interface for mutex locks. Mach cthreads version.
|
|
Copyright (C) 1996-2013 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 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.
|
|
|
|
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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _BITS_LIBC_LOCK_H
|
|
#define _BITS_LIBC_LOCK_H 1
|
|
|
|
#ifdef _LIBC
|
|
#include <cthreads.h>
|
|
#define __libc_lock_t struct mutex
|
|
#else
|
|
typedef struct __libc_lock_opaque__ __libc_lock_t;
|
|
#endif
|
|
|
|
/* Type for key of thread specific data. */
|
|
typedef cthread_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. */
|
|
#define __libc_lock_define_initialized(CLASS,NAME) \
|
|
CLASS __libc_lock_t NAME = MUTEX_INITIALIZER;
|
|
|
|
/* Initialize the named lock variable, leaving it in a consistent, unlocked
|
|
state. */
|
|
#define __libc_lock_init(NAME) __mutex_init (&(NAME))
|
|
|
|
/* 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) __mutex_unlock (&(NAME))
|
|
|
|
/* Lock the named lock variable. */
|
|
#define __libc_lock_lock(NAME) __mutex_lock (&(NAME))
|
|
|
|
/* Lock the named lock variable. */
|
|
#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME)))
|
|
|
|
/* Unlock the named lock variable. */
|
|
#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME))
|
|
|
|
|
|
/* XXX for now */
|
|
#define __libc_rwlock_define __libc_lock_define
|
|
#define __libc_rwlock_define_initialized __libc_lock_define_initialized
|
|
#define __libc_rwlock_init __libc_lock_init
|
|
#define __libc_rwlock_fini __libc_lock_fini
|
|
#define __libc_rwlock_rdlock __libc_lock_lock
|
|
#define __libc_rwlock_wrlock __libc_lock_lock
|
|
#define __libc_rwlock_tryrdlock __libc_lock_trylock
|
|
#define __libc_rwlock_trywrlock __libc_lock_trylock
|
|
#define __libc_rwlock_unlock __libc_lock_unlock
|
|
|
|
|
|
/* Start a critical region with a cleanup function */
|
|
#define __libc_cleanup_region_start(DOIT, FCT, ARG) \
|
|
{ \
|
|
typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \
|
|
typeof (ARG) __save_ARG = ARG; \
|
|
/* close brace is in __libc_cleanup_region_end below. */
|
|
|
|
/* End a critical region started with __libc_cleanup_region_start. */
|
|
#define __libc_cleanup_region_end(DOIT) \
|
|
if ((DOIT) && __save_FCT != 0) \
|
|
(*__save_FCT)(__save_ARG); \
|
|
}
|
|
|
|
/* Sometimes we have to exit the block in the middle. */
|
|
#define __libc_cleanup_end(DOIT) \
|
|
if ((DOIT) && __save_FCT != 0) \
|
|
(*__save_FCT)(__save_ARG); \
|
|
|
|
|
|
/* Use mutexes as once control variables. */
|
|
|
|
struct __libc_once
|
|
{
|
|
__libc_lock_t lock;
|
|
int done;
|
|
};
|
|
|
|
#define __libc_once_define(CLASS,NAME) \
|
|
CLASS struct __libc_once NAME = { MUTEX_INITIALIZER, 0 }
|
|
|
|
|
|
/* Call handler iff the first call. */
|
|
#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
|
|
do { \
|
|
__libc_lock_lock (ONCE_CONTROL.lock); \
|
|
if (!ONCE_CONTROL.done) \
|
|
(INIT_FUNCTION) (); \
|
|
ONCE_CONTROL.done = 1; \
|
|
__libc_lock_unlock (ONCE_CONTROL.lock); \
|
|
} while (0)
|
|
|
|
/* Get once control variable. */
|
|
#define __libc_once_get(ONCE_CONTROL) ((ONCE_CONTROL).done != 0)
|
|
|
|
#ifdef _LIBC
|
|
/* We need portable names for some functions. E.g., when they are
|
|
used as argument to __libc_cleanup_region_start. */
|
|
#define __libc_mutex_unlock __mutex_unlock
|
|
#endif
|
|
|
|
#define __libc_key_create(KEY,DEST) cthread_keycreate (KEY)
|
|
#define __libc_setspecific(KEY,VAL) cthread_setspecific (KEY, VAL)
|
|
void *__libc_getspecific (__libc_key_t key);
|
|
|
|
/* XXX until cthreads supports recursive locks */
|
|
#define __libc_lock_define_initialized_recursive __libc_lock_define_initialized
|
|
#define __libc_lock_init_recursive __libc_lock_init
|
|
#define __libc_lock_fini_recursive __libc_lock_fini
|
|
#define __libc_lock_trylock_recursive __libc_lock_trylock
|
|
#define __libc_lock_unlock_recursive __libc_lock_unlock
|
|
#define __libc_lock_lock_recursive __libc_lock_lock
|
|
|
|
#define __rtld_lock_define_initialized_recursive __libc_lock_define_initialized
|
|
#define __rtld_lock_fini_recursive __libc_lock_fini
|
|
#define __rtld_lock_trylock_recursive __libc_lock_trylock
|
|
#define __rtld_lock_unlock_recursive __libc_lock_unlock
|
|
#define __rtld_lock_lock_recursive __libc_lock_lock
|
|
|
|
#endif /* bits/libc-lock.h */
|