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Diffstat (limited to 'sysdeps/mach/bits/libc-lock.h')
| -rw-r--r-- | sysdeps/mach/bits/libc-lock.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/sysdeps/mach/bits/libc-lock.h b/sysdeps/mach/bits/libc-lock.h new file mode 100644 index 0000000000..f3ce23a88c --- /dev/null +++ b/sysdeps/mach/bits/libc-lock.h @@ -0,0 +1,90 @@ +/* libc-internal interface for mutex locks. Mach cthreads version. + Copyright (C) 1996, 1997 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 + +/* 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)) + +/* 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); \ +} + + +#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 + +/* 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 */ |