170 lines
5.8 KiB
C
170 lines
5.8 KiB
C
/* Private libc-internal interface for mutex locks.
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Copyright (C) 2015-2022 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 Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#ifndef _BITS_LIBC_LOCKP_H
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#define _BITS_LIBC_LOCKP_H 1
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#include <pthread.h>
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#include <pthread-functions.h>
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/* If we check for a weakly referenced symbol and then perform a
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normal jump to it te code generated for some platforms in case of
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PIC is unnecessarily slow. What would happen is that the function
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is first referenced as data and then it is called indirectly
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through the PLT. We can make this a direct jump. */
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#ifdef __PIC__
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# define __libc_maybe_call(FUNC, ARGS, ELSE) \
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(__extension__ ({ __typeof (FUNC) *_fn = (FUNC); \
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_fn != NULL ? (*_fn) ARGS : ELSE; }))
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#else
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# define __libc_maybe_call(FUNC, ARGS, ELSE) \
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(FUNC != NULL ? FUNC ARGS : ELSE)
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#endif
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/* Call thread functions through the function pointer table. */
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#if defined SHARED && IS_IN (libc)
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# define PTFAVAIL(NAME) __libc_pthread_functions_init
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# define __libc_ptf_call(FUNC, ARGS, ELSE) \
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(__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE)
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# define __libc_ptf_call_always(FUNC, ARGS) \
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PTHFCT_CALL (ptr_##FUNC, ARGS)
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#elif IS_IN (libpthread)
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# define PTFAVAIL(NAME) 1
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# define __libc_ptf_call(FUNC, ARGS, ELSE) \
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FUNC ARGS
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# define __libc_ptf_call_always(FUNC, ARGS) \
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FUNC ARGS
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#else
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# define PTFAVAIL(NAME) (NAME != NULL)
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# define __libc_ptf_call(FUNC, ARGS, ELSE) \
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__libc_maybe_call (FUNC, ARGS, ELSE)
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# define __libc_ptf_call_always(FUNC, ARGS) \
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FUNC ARGS
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#endif
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/* Create thread-specific key. */
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#define __libc_key_create(KEY, DESTRUCTOR) \
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__libc_ptf_call (__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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__libc_ptf_call (__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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__libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0)
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/* Functions that are used by this file and are internal to the GNU C
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library. */
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extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
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const pthread_mutexattr_t *__mutex_attr);
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extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
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extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr);
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extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr);
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extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr,
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int __kind);
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extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock,
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const pthread_rwlockattr_t *__attr);
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extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
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extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
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extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
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extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
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extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
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extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
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extern int __pthread_once (pthread_once_t *__once_control,
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void (*__init_routine) (void));
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extern int __pthread_atfork (void (*__prepare) (void),
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void (*__parent) (void),
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void (*__child) (void));
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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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#if !defined(__NO_WEAK_PTHREAD_ALIASES) && !IS_IN (libpthread)
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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_rwlock_init)
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weak_extern (__pthread_rwlock_destroy)
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weak_extern (__pthread_rwlock_rdlock)
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weak_extern (__pthread_rwlock_tryrdlock)
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weak_extern (__pthread_rwlock_wrlock)
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weak_extern (__pthread_rwlock_trywrlock)
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weak_extern (__pthread_rwlock_unlock)
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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 (__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_setcancelstate)
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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_rwlock_destroy
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# pragma weak __pthread_rwlock_rdlock
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# pragma weak __pthread_rwlock_tryrdlock
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# pragma weak __pthread_rwlock_wrlock
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# pragma weak __pthread_rwlock_trywrlock
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# pragma weak __pthread_rwlock_unlock
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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_once
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# pragma weak __pthread_initialize
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# pragma weak __pthread_atfork
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# pragma weak __pthread_setcancelstate
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# endif
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#endif
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#endif /* bits/libc-lockP.h */
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