libguile/mit-pthreads.h

   1 /* classes: h_files */
   2
   3 #ifndef MIT_PTHREADSH
   4 #define MIT_PTHREADSH
   5
   6 /*      Copyright (C) 1996 Free Software Foundation, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this software; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.
  45  */
  46 \f
  47
  48 #include "libguile/__scm.h"
  49
  50 #define PTHREAD_KERNEL
  51 #include <pthread.h>
  52
  53 /* Identify where the stack pointer can be found in a jmpbuf.
  54  */
  55
  56 /* Solaris 2.4 */
  57 #if defined(__sparc_setjmp_h)
  58 #  define THREAD_SP machdep_data.machdep_state[2]
  59 #endif
  60
  61 /* Solaris 2.5 */
  62 #if defined(__sparc)
  63 #ifndef THREAD_SP
  64 #  define THREAD_SP machdep_data.machdep_state[2]
  65 #endif
  66 #endif
  67
  68 #if defined(linux)
  69 #  define THREAD_SP machdep_data.machdep_state[0].__sp
  70 #endif
  71
  72 #if defined(sgi)
  73 #  define THREAD_SP machdep_data.machdep_state[JB_SP]
  74 #endif
  75
  76 /*  ...define THREAD_SP for your architecture here...
  77  */
  78
  79 #if !defined(THREAD_SP)
  80 --> where is your stack pointer?
  81 #endif
  82
  83 \f
  84
  85 /* Boost the priority of this thread so that it is the only
  86    one running. PTHREAD_MAX_PRIORITY is reserved for this
  87    purpose */
  88
  89 #define SCM_THREAD_CRITICAL_SECTION_START \
  90   struct sched_param param; \
  91   int previous_prio; \
  92   int policy; \
  93   pthread_getschedparam(pthread_self(), &policy, &param); \
  94   previous_prio = param.prio; \
  95   param.prio = PTHREAD_MAX_PRIORITY; \
  96   pthread_setschedparam(pthread_self(), policy, &param)
  97
  98 #define SCM_THREAD_CRITICAL_SECTION_END \
  99   param.prio = previous_prio; \
 100   pthread_setschedparam(pthread_self(), policy, &param)
 101
 102 \f
 103
 104 #if 1
 105
 106 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 107
 108 #define SCM_THREAD_DEFER pthread_kernel_lock++
 109 #define SCM_THREAD_ALLOW pthread_kernel_lock--
 110
 111 #define SCM_THREAD_REDEFER pthread_kernel_lock++
 112 #define SCM_THREAD_REALLOW_1 pthread_kernel_lock--
 113 #define SCM_THREAD_REALLOW_2 \
 114 { \
 115   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 116   pthread_mutex_unlock(&scm_critical_section_mutex); \
 117 }
 118
 119 #else
 120
 121 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 122
 123 #define SCM_THREAD_DEFER \
 124 { \
 125   pthread_mutex_lock (&scm_critical_section_mutex); \
 126   scm_critical_section_owner = pthread_self(); \
 127 }
 128
 129 #define SCM_THREAD_ALLOW \
 130 { \
 131   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 132   pthread_mutex_unlock (&scm_critical_section_mutex); \
 133 }
 134
 135 #define SCM_THREAD_REDEFER \
 136 { \
 137   if ((scm_critical_section_owner != pthread_self()) || \
 138       (scm_critical_section_owner == SCM_NO_CRITICAL_SECTION_OWNER)) \
 139     { \
 140       pthread_mutex_lock(&scm_critical_section_mutex); \
 141       scm_critical_section_owner = pthread_self(); \
 142     } \
 143 }
 144
 145 #define SCM_THREAD_REALLOW_1
 146 #define SCM_THREAD_REALLOW_2 \
 147 { \
 148   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 149   pthread_mutex_unlock (&scm_critical_section_mutex); \
 150 }
 151
 152 #endif
 153
 154 #define SCM_THREAD_SWITCHING_CODE
 155
 156 #define SCM_THREAD_LOCAL_DATA (pthread_self () -> attr.arg_attr)
 157 #define SCM_SET_THREAD_LOCAL_DATA(new_root) \
 158 { \
 159   pthread_t t = pthread_self (); \
 160   void *r = (new_root); \
 161   pthread_attr_setcleanup (&t -> attr, NULL, r); \
 162   pthreads_find_info (t) -> root = r; \
 163 }
 164
 165
 166 \f
 167
 168 void scm_threads_init_mit_pthreads ();
 169
 170 typedef struct QUEUE {
 171   struct QUEUE *flink, *blink;
 172 } queue;
 173
 174 extern pthread_mutex_t scm_critical_section_mutex;
 175 extern pthread_t scm_critical_section_owner;
 176
 177 /* Key to thread specific data */
 178 extern pthread_key_t info_key;
 179
 180 struct scm_pthread_create_info_type
 181 {
 182   SCM thunk;
 183   SCM error;
 184   SCM *prots;
 185 } scm_pthread_create_info;
 186
 187 #endif /* MIT_PTHREADSH */