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Diffstat (limited to 'newlib/libc/sys/linux/thread-m.h')
| -rw-r--r-- | newlib/libc/sys/linux/thread-m.h | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/thread-m.h b/newlib/libc/sys/linux/thread-m.h new file mode 100644 index 000000000..2cdacab19 --- /dev/null +++ b/newlib/libc/sys/linux/thread-m.h @@ -0,0 +1,241 @@ +/* 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; 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 <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) */ |