malloc/thread-m.h

   1 /* Basic platform-independent macro definitions for mutexes and
   2    thread-specific data.
   3    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>, 1996.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* $Id$
  23    One out of _LIBC, USE_PTHREADS, USE_THR or USE_SPROC should be
  24    defined, otherwise the token NO_THREADS and dummy implementations
  25    of the macros will be defined.  */
  26
  27 #ifndef _THREAD_M_H
  28 #define _THREAD_M_H
  29
  30 #undef thread_atfork_static
  31
  32 #if defined(_LIBC) /* The GNU C library, a special case of Posix threads */
  33
  34 #include <bits/libc-lock.h>
  35
  36 #ifdef PTHREAD_MUTEX_INITIALIZER
  37
  38 typedef pthread_t thread_id;
  39
  40 /* mutex */
  41 typedef pthread_mutex_t mutex_t;
  42
  43 /* thread specific data */
  44 typedef void * tsd_key_t;
  45
  46 #define MUTEX_INITIALIZER       PTHREAD_MUTEX_INITIALIZER
  47
  48 #define tsd_key_create(key, destr) ( *(key) = NULL )
  49 #define tsd_setspecific(key, data) \
  50   if (__libc_internal_tsd_set != NULL) {                                      \
  51     __libc_internal_tsd_set(_LIBC_TSD_KEY_MALLOC, data);                      \
  52   } else { (key) = (Void_t *) data; }
  53 #define tsd_getspecific(key, vptr) \
  54   (vptr = (__libc_internal_tsd_get != NULL                                    \
  55            ? __libc_internal_tsd_get(_LIBC_TSD_KEY_MALLOC) : (key)))
  56
  57 #define mutex_init(m)           \
  58    (__pthread_mutex_init != NULL ? __pthread_mutex_init (m, NULL) : 0)
  59 #define mutex_lock(m)           \
  60    (__pthread_mutex_lock != NULL ? __pthread_mutex_lock (m) : 0)
  61 #define mutex_trylock(m)        \
  62    (__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (m) : 0)
  63 #define mutex_unlock(m)         \
  64    (__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (m) : 0)
  65
  66 #define thread_atfork(prepare, parent, child) \
  67    (__pthread_atfork != NULL ? __pthread_atfork(prepare, parent, child) : 0)
  68
  69 #elif defined(MUTEX_INITIALIZER)
  70 /* Assume hurd, with cthreads */
  71
  72 /* Cthreads `mutex_t' is a pointer to a mutex, and malloc wants just the
  73    mutex itself.  */
  74 #undef mutex_t
  75 #define mutex_t struct mutex
  76
  77 #undef mutex_init
  78 #define mutex_init(m) (__mutex_init(m), 0)
  79
  80 #undef mutex_lock
  81 #define mutex_lock(m) (__mutex_lock(m), 0)
  82
  83 #undef mutex_unlock
  84 #define mutex_unlock(m) (__mutex_unlock(m), 0)
  85
  86 #define mutex_trylock(m) (!__mutex_trylock(m))
  87
  88 #include <hurd/threadvar.h>
  89
  90 /* thread specific data */
  91 typedef int tsd_key_t;
  92
  93 static int tsd_keys_alloced = 0;
  94
  95 #define tsd_key_create(key, destr) \
  96   (assert (tsd_keys_alloced == 0), tsd_keys_alloced++)
  97 #define tsd_setspecific(key, data) \
  98   (*__hurd_threadvar_location (_HURD_THREADVAR_MALLOC) = (unsigned long)(data))
  99 #define tsd_getspecific(key, vptr) \
 100   ((vptr) = (void *)*__hurd_threadvar_location (_HURD_THREADVAR_MALLOC))
 101
 102 #define thread_atfork(prepare, parent, child) do {} while(0)
 103 #define thread_atfork_static(prepare, parent, child) \
 104  text_set_element(_hurd_fork_prepare_hook, prepare); \
 105  text_set_element(_hurd_fork_parent_hook, parent); \
 106  text_set_element(_hurd_fork_child_hook, child);
 107
 108 /* No we're *not* using pthreads.  */
 109 #define __pthread_initialize ((void (*)(void))0)
 110
 111 #else
 112
 113 #define NO_THREADS
 114
 115 #endif /* MUTEX_INITIALIZER && PTHREAD_MUTEX_INITIALIZER */
 116
 117 #elif defined(USE_PTHREADS) /* Posix threads */
 118
 119 #include <pthread.h>
 120
 121 typedef pthread_t thread_id;
 122
 123 /* mutex */
 124 typedef pthread_mutex_t mutex_t;
 125
 126 #define MUTEX_INITIALIZER          PTHREAD_MUTEX_INITIALIZER
 127 #define mutex_init(m)              pthread_mutex_init(m, NULL)
 128 #define mutex_lock(m)              pthread_mutex_lock(m)
 129 #define mutex_trylock(m)           pthread_mutex_trylock(m)
 130 #define mutex_unlock(m)            pthread_mutex_unlock(m)
 131
 132 /* thread specific data */
 133 #if defined(__sgi) || defined(USE_TSD_DATA_HACK)
 134
 135 /* Hack for thread-specific data, e.g. on Irix 6.x.  We can't use
 136    pthread_setspecific because that function calls malloc() itself.
 137    The hack only works when pthread_t can be converted to an integral
 138    type. */
 139
 140 typedef void *tsd_key_t[256];
 141 #define tsd_key_create(key, destr) do { \
 142   int i; \
 143   for(i=0; i<256; i++) (*key)[i] = 0; \
 144 } while(0)
 145 #define tsd_setspecific(key, data) \
 146  (key[(unsigned)pthread_self() % 256] = (data))
 147 #define tsd_getspecific(key, vptr) \
 148  (vptr = key[(unsigned)pthread_self() % 256])
 149
 150 #else
 151
 152 typedef pthread_key_t tsd_key_t;
 153
 154 #define tsd_key_create(key, destr) pthread_key_create(key, destr)
 155 #define tsd_setspecific(key, data) pthread_setspecific(key, data)
 156 #define tsd_getspecific(key, vptr) (vptr = pthread_getspecific(key))
 157
 158 #endif
 159
 160 /* at fork */
 161 #define thread_atfork(prepare, parent, child) \
 162                                    pthread_atfork(prepare, parent, child)
 163
 164 #elif USE_THR /* Solaris threads */
 165
 166 #include <thread.h>
 167
 168 typedef thread_t thread_id;
 169
 170 #define MUTEX_INITIALIZER          { 0 }
 171 #define mutex_init(m)              mutex_init(m, USYNC_THREAD, NULL)
 172
 173 /*
 174  * Hack for thread-specific data on Solaris.  We can't use thr_setspecific
 175  * because that function calls malloc() itself.
 176  */
 177 typedef void *tsd_key_t[256];
 178 #define tsd_key_create(key, destr) do { \
 179   int i; \
 180   for(i=0; i<256; i++) (*key)[i] = 0; \
 181 } while(0)
 182 #define tsd_setspecific(key, data) (key[(unsigned)thr_self() % 256] = (data))
 183 #define tsd_getspecific(key, vptr) (vptr = key[(unsigned)thr_self() % 256])
 184
 185 #define thread_atfork(prepare, parent, child) do {} while(0)
 186
 187 #elif USE_SPROC /* SGI sproc() threads */
 188
 189 #include <sys/wait.h>
 190 #include <sys/types.h>
 191 #include <sys/prctl.h>
 192 #include <abi_mutex.h>
 193
 194 typedef int thread_id;
 195
 196 typedef abilock_t mutex_t;
 197
 198 #define MUTEX_INITIALIZER          { 0 }
 199 #define mutex_init(m)              init_lock(m)
 200 #define mutex_lock(m)              (spin_lock(m), 0)
 201 #define mutex_trylock(m)           acquire_lock(m)
 202 #define mutex_unlock(m)            release_lock(m)
 203
 204 typedef int tsd_key_t;
 205 int tsd_key_next;
 206 #define tsd_key_create(key, destr) ((*key) = tsd_key_next++)
 207 #define tsd_setspecific(key, data) (((void **)(&PRDA->usr_prda))[key] = data)
 208 #define tsd_getspecific(key, vptr) (vptr = ((void **)(&PRDA->usr_prda))[key])
 209
 210 #define thread_atfork(prepare, parent, child) do {} while(0)
 211
 212 #else /* no _LIBC or USE_... are defined */
 213
 214 #define NO_THREADS
 215
 216 #endif /* defined(_LIBC) */
 217
 218 #ifdef NO_THREADS /* No threads, provide dummy macros */
 219
 220 typedef int thread_id;
 221
 222 typedef int mutex_t;
 223
 224 #define MUTEX_INITIALIZER          0
 225 #define mutex_init(m)              (*(m) = 0)
 226 #define mutex_lock(m)              (0)
 227 #define mutex_trylock(m)           (0)
 228 #define mutex_unlock(m)            (0)
 229
 230 typedef void *tsd_key_t;
 231 #define tsd_key_create(key, destr) do {} while(0)
 232 #define tsd_setspecific(key, data) do {} while(0)
 233 #define tsd_getspecific(key, vptr) (vptr = NULL)
 234
 235 #define thread_atfork(prepare, parent, child) do {} while(0)
 236
 237 #endif /* defined(NO_THREADS) */
 238
 239 #endif /* !defined(_THREAD_M_H) */