113 lines
4.9 KiB
C
113 lines
4.9 KiB
C
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/* libc-internal interface for mutex locks. LinuxThreads version.
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Copyright (C) 1996 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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#include <pthread.h>
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#define __libc_lock_t pthread_mutex_t
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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 = PTHREAD_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) \
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(__pthread_mutex_init != NULL ? __pthread_mutex_init (&(NAME), NULL) : 0);
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/* Same as last but this time we initialize a recursive mutex. */
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#define __libc_lock_init_recursive(NAME) \
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do { \
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if (__pthread_mutex_init != NULL) \
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{ \
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pthread_mutexattr_t __attr; \
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__pthread_mutexattr_init (&__attr); \
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__pthread_mutexattr_setkind_np (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
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__pthread_mutex_init (&(NAME), &__attr); \
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__pthread_mutexattr_destroy (&__attr); \
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} \
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} while (0);
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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) \
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(__pthread_mutex_destroy != NULL ? __pthread_mutex_destroy (&(NAME)) : 0);
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/* Lock the named lock variable. */
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#define __libc_lock_lock(NAME) \
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(__pthread_mutex_lock != NULL ? __pthread_mutex_lock (&(NAME)) : 0);
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/* Try to lock the named lock variable. */
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#define __libc_lock_trylock(NAME) \
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(__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (&(NAME)) : 0);
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/* Unlock the named lock variable. */
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#define __libc_lock_unlock(NAME) \
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(__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (&(NAME)) : 0);
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/* Start critical region with cleanup. */
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#define __libc_cleanup_region_start(FCT, ARG) \
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{ struct _pthread_cleanup_buffer _buffer; \
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if (_pthread_cleanup_push_defer != NULL) { \
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_pthread_cleanup_push_defer (&_buffer, (FCT), (ARG)); \
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}
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/* End critical region with cleanup. */
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#define __libc_cleanup_region_end(DOIT) \
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if (_pthread_cleanup_push_defer != NULL) { \
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_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
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} \
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}
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/* Make the pthread functions weak so that we can elide them from
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single-threaded processes. */
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#pragma weak __pthread_mutex_init
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#pragma weak __pthread_mutex_destroy
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#pragma weak __pthread_mutex_lock
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#pragma weak __pthread_mutex_trylock
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#pragma weak __pthread_mutex_unlock
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#pragma weak __pthread_mutexattr_init
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#pragma weak __pthread_mutexattr_destroy
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#pragma weak __pthread_mutexattr_setkind_np
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#pragma weak __pthread_key_create
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#pragma weak __pthread_setspecific
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#pragma weak __pthread_getspecific
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#pragma weak __pthread_initialize
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#pragma weak _pthread_cleanup_push_defer
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#pragma weak _pthread_cleanup_pop_restore
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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 __pthread_mutex_unlock
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#endif /* libc-lock.h */
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