99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/* libc-internal interface for mutex locks. Mach cthreads version.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _LIBC_LOCK_H
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#define _LIBC_LOCK_H 1
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#ifdef _LIBC
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#include <cthreads.h>
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#define __libc_lock_t struct mutex
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#else
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typedef struct __libc_lock_opaque__ __libc_lock_t;
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#endif
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/* Define a lock variable NAME with storage class CLASS. The lock must be
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initialized with __libc_lock_init before it can be used (or define it
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with __libc_lock_define_initialized, below). Use `extern' for CLASS to
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declare a lock defined in another module. In public structure
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definitions you must use a pointer to the lock structure (i.e., NAME
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begins with a `*'), because its storage size will not be known outside
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of libc. */
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#define __libc_lock_define(CLASS,NAME) \
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CLASS __libc_lock_t NAME;
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/* Define an initialized lock variable NAME with storage class CLASS. */
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#define __libc_lock_define_initialized(CLASS,NAME) \
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CLASS __libc_lock_t NAME = MUTEX_INITIALIZER;
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/* Initialize the named lock variable, leaving it in a consistent, unlocked
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state. */
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#define __libc_lock_init(NAME) __mutex_init (&(NAME))
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/* Finalize the named lock variable, which must be locked. It cannot be
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used again until __libc_lock_init is called again on it. This must be
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called on a lock variable before the containing storage is reused. */
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#define __libc_lock_fini(NAME) __mutex_unlock (&(NAME))
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/* Lock the named lock variable. */
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#define __libc_lock_lock(NAME) __mutex_lock (&(NAME))
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/* Lock the named lock variable. */
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#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME)))
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/* Unlock the named lock variable. */
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#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME))
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/* Start a critical region with a cleanup function */
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#define __libc_cleanup_region_start(FCT, ARG) \
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{ \
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typeof (FCT) __save_FCT = FCT; \
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typeof (ARG) __save_ARG = ARG; \
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/* close brace is in __libc_cleanup_region_end below. */
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/* End a critical region started with __libc_cleanup_region_start. */
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#define __libc_cleanup_region_end(DOIT) \
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if (DOIT) \
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(*__save_FCT)(__save_ARG); \
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}
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#ifdef _LIBC
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/* We need portable names for some functions. E.g., when they are
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used as argument to __libc_cleanup_region_start. */
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#define __libc_mutex_unlock __mutex_unlock
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#endif
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/* XXX until cthreads supports recursive locks */
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#define __libc_lock_define_initialized_recursive __libc_lock_define_initialized
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#define __libc_lock_init_recursive __libc_lock_init
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#define __libc_lock_fini_recursive __libc_lock_fini
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#define __libc_lock_trylock_recursive __libc_lock_trylock
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#define __libc_lock_unlock_recursive __libc_lock_unlock
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#define __libc_lock_lock_recursive __libc_lock_lock
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/* XXX until cthreads supports recursive locks */
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#define __libc_lock_define_initialized_recursive __libc_lock_define_initialized
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#define __libc_lock_init_recursive __libc_lock_init
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#define __libc_lock_fini_recursive __libc_lock_fini
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#define __libc_lock_trylock_recursive __libc_lock_trylock
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#define __libc_lock_unlock_recursive __libc_lock_unlock
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#define __libc_lock_lock_recursive __libc_lock_lock
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#endif /* libc-lock.h */
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