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1998-09-06 09:00 Ulrich Drepper <drepper@cygnus.com> * version.h (VERSION): Bump to 2.0.96. Rewrite runtime linker to be truly thread-safe. There is now no global variable specifying the scope. We create all needed scopes at the time the link maps are created. * elf/Versions [GLIBC_2.1]: Add _dl_loaded and _dl_main_searchlist. * elf/link.h: Add struct r_scope_elem and use this for l_searchlist, l_symbolic_searchlist, l_scope, and l_local_scope elements in struct link_map. * elf/dl-close.c: Rewritten accordingly. * elf/dl-deps.c: Likewise. * elf/dl-error.c: Likewise. * elf/dl-init.c: Likewise. * elf/dl-load.c: Likewise. * elf/dl-lookup.c: Likewise. * elf/dl-object.c: Likewise. * elf/dl-open.c: Likewise. * elf/dl-reloc.c: Likewise. * elf/dl-runtime.c: Likewise. * elf/dl-support.c: Likewise. * elf/dl-symbol.c: Likewise. * elf/dl-version.c: Likewise. * elf/dlfcn.h: Likewise. * elf/dlsym.c: Likewise. * elf/dlvsym.c: Likewise. * elf/ldsodefs.h: Likewise. * elf/rtld.c: Likewise. * iconv/gconv_dl.c: Likewise. * nss/nsswitch.c: Likewise. * sysdeps/i386/dl-machine.h: Likewise. * sysdeps/unix/sysv/linux/i386/dl-librecon.h: Likewise.
218 lines
7.8 KiB
C++
218 lines
7.8 KiB
C++
/* libc-internal interface for mutex locks. LinuxThreads version.
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Copyright (C) 1996, 1997, 1998 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 _BITS_LIBC_LOCK_H
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#define _BITS_LIBC_LOCK_H 1
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#include <pthread.h>
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/* Mutex type. */
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#ifdef _LIBC
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typedef pthread_mutex_t __libc_lock_t;
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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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/* Type for key to thread-specific data. */
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typedef pthread_key_t __libc_key_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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/* Define an initialized recursive lock variable NAME with storage
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class CLASS. */
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#define __libc_lock_define_initialized_recursive(CLASS,NAME) \
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CLASS __libc_lock_t NAME = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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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_settype (&__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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/* Finalize recursive named lock. */
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#define __libc_lock_fini_recursive(NAME) __libc_lock_fini (NAME)
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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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/* Lock the recursive named lock variable. */
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#define __libc_lock_lock_recursive(NAME) __libc_lock_lock (NAME)
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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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/* Try to lock the recursive named lock variable. */
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#define __libc_lock_trylock_recursive(NAME) __libc_lock_trylock (NAME)
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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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/* Unlock the recursive named lock variable. */
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#define __libc_lock_unlock_recursive(NAME) __libc_lock_unlock (NAME)
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/* Define once control variable. */
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#define __libc_once_define(CLASS, NAME) \
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CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT
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/* Call handler iff the first call. */
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#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
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do { \
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if (__pthread_once != NULL) \
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__pthread_once (&(ONCE_CONTROL), (INIT_FUNCTION)); \
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else if ((ONCE_CONTROL) == 0) { \
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INIT_FUNCTION (); \
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(ONCE_CONTROL) = 1; \
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} \
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} while (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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int _avail = _pthread_cleanup_push_defer != NULL; \
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if (_avail) { \
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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 (_avail) { \
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_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
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} \
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}
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/* Sometimes we have to exit the block in the middle. */
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#define __libc_cleanup_end(DOIT) \
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if (_avail) { \
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_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
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}
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/* Create thread-specific key. */
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#define __libc_key_create(KEY, DESTRUCTOR) \
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(__pthread_key_create != NULL ? __pthread_key_create (KEY, DESTRUCTOR) : 1)
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/* Get thread-specific data. */
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#define __libc_getspecific(KEY) \
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(__pthread_getspecific != NULL ? __pthread_getspecific (KEY) : NULL)
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/* Set thread-specific data. */
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#define __libc_setspecific(KEY, VALUE) \
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(__pthread_setspecific != NULL ? __pthread_setspecific (KEY, VALUE) : 0)
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#ifdef _LIBC
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/* Fast thread-specific data internal to libc. */
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enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0,
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_LIBC_TSD_KEY_DL_ERROR,
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_LIBC_TSD_KEY_N };
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extern void *__libc_internal_tsd_get __P ((enum __libc_tsd_key_t));
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extern int __libc_internal_tsd_set __P ((enum __libc_tsd_key_t,
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__const void *));
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#endif
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/* Register handlers to execute before and after `fork'. */
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#define __libc_atfork(PREPARE, PARENT, CHILD) \
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(__pthread_atfork != NULL ? __pthread_atfork (PREPARE, PARENT, CHILD) : 0)
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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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#ifdef weak_extern
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weak_extern (__pthread_mutex_init)
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weak_extern (__pthread_mutex_destroy)
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weak_extern (__pthread_mutex_lock)
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weak_extern (__pthread_mutex_trylock)
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weak_extern (__pthread_mutex_unlock)
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weak_extern (__pthread_mutexattr_init)
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weak_extern (__pthread_mutexattr_destroy)
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weak_extern (__pthread_mutexattr_settype)
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weak_extern (__pthread_key_create)
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weak_extern (__pthread_setspecific)
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weak_extern (__pthread_getspecific)
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weak_extern (__libc_internal_tsd_get)
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weak_extern (__libc_internal_tsd_set)
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weak_extern (__pthread_once)
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weak_extern (__pthread_initialize)
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weak_extern (__pthread_atfork)
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weak_extern (_pthread_cleanup_push_defer)
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weak_extern (_pthread_cleanup_pop_restore)
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#else
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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_settype
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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 __libc_internal_tsd_get
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# pragma weak __libc_internal_tsd_set
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# pragma weak __pthread_once
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# pragma weak __pthread_initialize
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# pragma weak __pthread_atfork
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# pragma weak _pthread_cleanup_push_defer
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# pragma weak _pthread_cleanup_pop_restore
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#endif
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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 /* bits/libc-lock.h */
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