glibc/sysdeps/mach/bits/libc-lock.h
Roland McGrath 224a12bcb2 * sysdeps/mach/hurd/sigstack.c (sigstack): Remove `const' from
argument type, for 2000-02-22 change in signal/signal.h declaration.

	* sysdeps/generic/getdents64.c (__getdirentries64): Renamed
	to getdirentries64 (no __), since the Linux implementation
	has no __ name, and there is no declaration for the __ name.

	* sysdeps/mach/bits/libc-lock.h (__libc_cleanup_end): New macro.

	* sysdeps/mach/hurd/Makefile ($(common-objpfx)errnos.d): Tighten up
	sed regexp so as not to break directory names including /../ within.

	* sysdeps/unix/bsd/bits/waitflags.h: File removed.
	The sysdeps/generic file is right for BSD.  This file was in fact the
	Hurd file, but the only difference was the WNOREAP flag that was never
	actually implemented or used anywhere.
2000-03-09 22:44:39 +00:00

138 lines
5.0 KiB
C

/* libc-internal interface for mutex locks. Mach cthreads version.
Copyright (C) 1996,97,98,2000 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
#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(FCT, ARG) \
{ \
typeof (FCT) __save_FCT = FCT; \
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)(__save_ARG); \
}
/* Sometimes we have to exit the block in the middle. */
#define __libc_cleanup_end(DOIT) \
if (DOIT) \
(*__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)
#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
#endif /* bits/libc-lock.h */