mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 15:30:07 +00:00
ce3019ccbb
* malloc/thread-m.h: gcc doesn't tolerate zero-sized types anymore.
242 lines
7.5 KiB
C++
242 lines
7.5 KiB
C++
/* Basic platform-independent macro definitions for mutexes and
|
|
thread-specific data.
|
|
Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>, 1996.
|
|
|
|
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. */
|
|
|
|
/* $Id$
|
|
One out of _LIBC, USE_PTHREADS, USE_THR or USE_SPROC should be
|
|
defined, otherwise the token NO_THREADS and dummy implementations
|
|
of the macros will be defined. */
|
|
|
|
#ifndef _THREAD_M_H
|
|
#define _THREAD_M_H
|
|
|
|
#undef thread_atfork_static
|
|
|
|
#if defined(_LIBC) /* The GNU C library, a special case of Posix threads */
|
|
|
|
#include <bits/libc-lock.h>
|
|
|
|
#ifdef PTHREAD_MUTEX_INITIALIZER
|
|
|
|
typedef pthread_t thread_id;
|
|
|
|
/* mutex */
|
|
typedef pthread_mutex_t mutex_t;
|
|
|
|
#define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
|
|
|
|
/* Even if not linking with libpthread, ensure usability of mutex as
|
|
an `in use' flag, see also the NO_THREADS case below. Assume
|
|
pthread_mutex_t is at least one int wide. */
|
|
|
|
#define mutex_init(m) \
|
|
(__pthread_mutex_init != NULL \
|
|
? __pthread_mutex_init (m, NULL) : (*(int *)(m) = 0))
|
|
#define mutex_lock(m) \
|
|
(__pthread_mutex_lock != NULL \
|
|
? __pthread_mutex_lock (m) : ((*(int *)(m) = 1), 0))
|
|
#define mutex_trylock(m) \
|
|
(__pthread_mutex_trylock != NULL \
|
|
? __pthread_mutex_trylock (m) : (*(int *)(m) ? 1 : ((*(int *)(m) = 1), 0)))
|
|
#define mutex_unlock(m) \
|
|
(__pthread_mutex_unlock != NULL \
|
|
? __pthread_mutex_unlock (m) : (*(int*)(m) = 0))
|
|
|
|
#define thread_atfork(prepare, parent, child) \
|
|
(__pthread_atfork != NULL ? __pthread_atfork(prepare, parent, child) : 0)
|
|
|
|
#elif defined(MUTEX_INITIALIZER)
|
|
/* Assume hurd, with cthreads */
|
|
|
|
/* Cthreads `mutex_t' is a pointer to a mutex, and malloc wants just the
|
|
mutex itself. */
|
|
#undef mutex_t
|
|
#define mutex_t struct mutex
|
|
|
|
#undef mutex_init
|
|
#define mutex_init(m) (__mutex_init(m), 0)
|
|
|
|
#undef mutex_lock
|
|
#define mutex_lock(m) (__mutex_lock(m), 0)
|
|
|
|
#undef mutex_unlock
|
|
#define mutex_unlock(m) (__mutex_unlock(m), 0)
|
|
|
|
#define mutex_trylock(m) (!__mutex_trylock(m))
|
|
|
|
#define thread_atfork(prepare, parent, child) do {} while(0)
|
|
#define thread_atfork_static(prepare, parent, child) \
|
|
text_set_element(_hurd_fork_prepare_hook, prepare); \
|
|
text_set_element(_hurd_fork_parent_hook, parent); \
|
|
text_set_element(_hurd_fork_child_hook, child);
|
|
|
|
/* No we're *not* using pthreads. */
|
|
#define __pthread_initialize ((void (*)(void))0)
|
|
|
|
#else
|
|
|
|
#define NO_THREADS
|
|
|
|
#endif /* MUTEX_INITIALIZER && PTHREAD_MUTEX_INITIALIZER */
|
|
|
|
#ifndef NO_THREADS
|
|
|
|
/* thread specific data for glibc */
|
|
|
|
#include <bits/libc-tsd.h>
|
|
|
|
typedef int tsd_key_t[1]; /* no key data structure, libc magic does it */
|
|
__libc_tsd_define (, MALLOC) /* declaration/common definition */
|
|
#define tsd_key_create(key, destr) ((void) (key))
|
|
#define tsd_setspecific(key, data) __libc_tsd_set (MALLOC, (data))
|
|
#define tsd_getspecific(key, vptr) ((vptr) = __libc_tsd_get (MALLOC))
|
|
|
|
#endif
|
|
|
|
#elif defined(USE_PTHREADS) /* Posix threads */
|
|
|
|
#include <pthread.h>
|
|
|
|
typedef pthread_t thread_id;
|
|
|
|
/* mutex */
|
|
typedef pthread_mutex_t mutex_t;
|
|
|
|
#define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
|
|
#define mutex_init(m) pthread_mutex_init(m, NULL)
|
|
#define mutex_lock(m) pthread_mutex_lock(m)
|
|
#define mutex_trylock(m) pthread_mutex_trylock(m)
|
|
#define mutex_unlock(m) pthread_mutex_unlock(m)
|
|
|
|
/* thread specific data */
|
|
#if defined(__sgi) || defined(USE_TSD_DATA_HACK)
|
|
|
|
/* Hack for thread-specific data, e.g. on Irix 6.x. We can't use
|
|
pthread_setspecific because that function calls malloc() itself.
|
|
The hack only works when pthread_t can be converted to an integral
|
|
type. */
|
|
|
|
typedef void *tsd_key_t[256];
|
|
#define tsd_key_create(key, destr) do { \
|
|
int i; \
|
|
for(i=0; i<256; i++) (*key)[i] = 0; \
|
|
} while(0)
|
|
#define tsd_setspecific(key, data) \
|
|
(key[(unsigned)pthread_self() % 256] = (data))
|
|
#define tsd_getspecific(key, vptr) \
|
|
(vptr = key[(unsigned)pthread_self() % 256])
|
|
|
|
#else
|
|
|
|
typedef pthread_key_t tsd_key_t;
|
|
|
|
#define tsd_key_create(key, destr) pthread_key_create(key, destr)
|
|
#define tsd_setspecific(key, data) pthread_setspecific(key, data)
|
|
#define tsd_getspecific(key, vptr) (vptr = pthread_getspecific(key))
|
|
|
|
#endif
|
|
|
|
/* at fork */
|
|
#define thread_atfork(prepare, parent, child) \
|
|
pthread_atfork(prepare, parent, child)
|
|
|
|
#elif USE_THR /* Solaris threads */
|
|
|
|
#include <thread.h>
|
|
|
|
typedef thread_t thread_id;
|
|
|
|
#define MUTEX_INITIALIZER { 0 }
|
|
#define mutex_init(m) mutex_init(m, USYNC_THREAD, NULL)
|
|
|
|
/*
|
|
* Hack for thread-specific data on Solaris. We can't use thr_setspecific
|
|
* because that function calls malloc() itself.
|
|
*/
|
|
typedef void *tsd_key_t[256];
|
|
#define tsd_key_create(key, destr) do { \
|
|
int i; \
|
|
for(i=0; i<256; i++) (*key)[i] = 0; \
|
|
} while(0)
|
|
#define tsd_setspecific(key, data) (key[(unsigned)thr_self() % 256] = (data))
|
|
#define tsd_getspecific(key, vptr) (vptr = key[(unsigned)thr_self() % 256])
|
|
|
|
#define thread_atfork(prepare, parent, child) do {} while(0)
|
|
|
|
#elif USE_SPROC /* SGI sproc() threads */
|
|
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
#include <sys/prctl.h>
|
|
#include <abi_mutex.h>
|
|
|
|
typedef int thread_id;
|
|
|
|
typedef abilock_t mutex_t;
|
|
|
|
#define MUTEX_INITIALIZER { 0 }
|
|
#define mutex_init(m) init_lock(m)
|
|
#define mutex_lock(m) (spin_lock(m), 0)
|
|
#define mutex_trylock(m) acquire_lock(m)
|
|
#define mutex_unlock(m) release_lock(m)
|
|
|
|
typedef int tsd_key_t;
|
|
int tsd_key_next;
|
|
#define tsd_key_create(key, destr) ((*key) = tsd_key_next++)
|
|
#define tsd_setspecific(key, data) (((void **)(&PRDA->usr_prda))[key] = data)
|
|
#define tsd_getspecific(key, vptr) (vptr = ((void **)(&PRDA->usr_prda))[key])
|
|
|
|
#define thread_atfork(prepare, parent, child) do {} while(0)
|
|
|
|
#else /* no _LIBC or USE_... are defined */
|
|
|
|
#define NO_THREADS
|
|
|
|
#endif /* defined(_LIBC) */
|
|
|
|
#ifdef NO_THREADS /* No threads, provide dummy macros */
|
|
|
|
typedef int thread_id;
|
|
|
|
/* The mutex functions used to do absolutely nothing, i.e. lock,
|
|
trylock and unlock would always just return 0. However, even
|
|
without any concurrently active threads, a mutex can be used
|
|
legitimately as an `in use' flag. To make the code that is
|
|
protected by a mutex async-signal safe, these macros would have to
|
|
be based on atomic test-and-set operations, for example. */
|
|
typedef int mutex_t;
|
|
|
|
#define MUTEX_INITIALIZER 0
|
|
#define mutex_init(m) (*(m) = 0)
|
|
#define mutex_lock(m) ((*(m) = 1), 0)
|
|
#define mutex_trylock(m) (*(m) ? 1 : ((*(m) = 1), 0))
|
|
#define mutex_unlock(m) (*(m) = 0)
|
|
|
|
typedef void *tsd_key_t;
|
|
#define tsd_key_create(key, destr) do {} while(0)
|
|
#define tsd_setspecific(key, data) ((key) = (data))
|
|
#define tsd_getspecific(key, vptr) (vptr = (key))
|
|
|
|
#define thread_atfork(prepare, parent, child) do {} while(0)
|
|
|
|
#endif /* defined(NO_THREADS) */
|
|
|
|
#endif /* !defined(_THREAD_M_H) */
|