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, Inc., 59 Temple Place, Suite 330,
  21  * Boston, MA 02111-1307 USA
  22  *
  23  * As a special exception, the Free Software Foundation gives permission
  24  * for additional uses of the text contained in its release of GUILE.
  25  *
  26  * The exception is that, if you link the GUILE library with other files
  27  * to produce an executable, this does not by itself cause the
  28  * resulting executable to be covered by the GNU General Public License.
  29  * Your use of that executable is in no way restricted on account of
  30  * linking the GUILE library code into it.
  31  *
  32  * This exception does not however invalidate any other reasons why
  33  * the executable file might be covered by the GNU General Public License.
  34  *
  35  * This exception applies only to the code released by the
  36  * Free Software Foundation under the name GUILE.  If you copy
  37  * code from other Free Software Foundation releases into a copy of
  38  * GUILE, as the General Public License permits, the exception does
  39  * not apply to the code that you add in this way.  To avoid misleading
  40  * anyone as to the status of such modified files, you must delete
  41  * this exception notice from them.
  42  *
  43  * If you write modifications of your own for GUILE, it is your choice
  44  * whether to permit this exception to apply to your modifications.
  45  * If you do not wish that, delete this exception notice.  */
  46
  47 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  48    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  49 \f
  50
  51 #include "libguile/__scm.h"
  52
  53 #define PTHREAD_KERNEL
  54 #include <pthread.h>
  55
  56 /* Identify where the stack pointer can be found in a jmpbuf.
  57  */
  58
  59 /* Solaris 2.4 */
  60 #if defined(__sparc_setjmp_h)
  61 #  define THREAD_SP machdep_data.machdep_state[2]
  62 #endif
  63
  64 /* Solaris 2.5 */
  65 #if defined(__sparc)
  66 #ifndef THREAD_SP
  67 #  define THREAD_SP machdep_data.machdep_state[2]
  68 #endif
  69 #endif
  70
  71 #if defined(linux)
  72 #  define THREAD_SP machdep_data.machdep_state[0].__sp
  73 #endif
  74
  75 #if defined(sgi)
  76 #  define THREAD_SP machdep_data.machdep_state[JB_SP]
  77 #endif
  78
  79 /*  ...define THREAD_SP for your architecture here...
  80  */
  81
  82 #if !defined(THREAD_SP)
  83 --> where is your stack pointer?
  84 #endif
  85
  86 \f
  87
  88 /* Boost the priority of this thread so that it is the only
  89    one running. PTHREAD_MAX_PRIORITY is reserved for this
  90    purpose */
  91
  92 #define SCM_THREAD_CRITICAL_SECTION_START \
  93   struct sched_param param; \
  94   int previous_prio; \
  95   int policy; \
  96   pthread_getschedparam(pthread_self(), &policy, &param); \
  97   previous_prio = param.prio; \
  98   param.prio = PTHREAD_MAX_PRIORITY; \
  99   pthread_setschedparam(pthread_self(), policy, &param)
 100
 101 #define SCM_THREAD_CRITICAL_SECTION_END \
 102   param.prio = previous_prio; \
 103   pthread_setschedparam(pthread_self(), policy, &param)
 104
 105 \f
 106
 107 #if 1
 108
 109 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 110
 111 #define SCM_THREAD_DEFER pthread_kernel_lock++
 112 #define SCM_THREAD_ALLOW pthread_kernel_lock--
 113
 114 #define SCM_THREAD_REDEFER pthread_kernel_lock++
 115 #define SCM_THREAD_REALLOW_1 pthread_kernel_lock--
 116 #define SCM_THREAD_REALLOW_2 \
 117 do { \
 118   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 119   pthread_mutex_unlock(&scm_critical_section_mutex); \
 120 } while (0)
 121
 122 #else
 123
 124 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 125
 126 #define SCM_THREAD_DEFER \
 127 do { \
 128   pthread_mutex_lock (&scm_critical_section_mutex); \
 129   scm_critical_section_owner = pthread_self(); \
 130 } while (0)
 131
 132 #define SCM_THREAD_ALLOW \
 133 do { \
 134   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 135   pthread_mutex_unlock (&scm_critical_section_mutex); \
 136 } while (0)
 137
 138 #define SCM_THREAD_REDEFER \
 139 do { \
 140   if ((scm_critical_section_owner != pthread_self()) || \
 141       (scm_critical_section_owner == SCM_NO_CRITICAL_SECTION_OWNER)) \
 142     { \
 143       pthread_mutex_lock(&scm_critical_section_mutex); \
 144       scm_critical_section_owner = pthread_self(); \
 145     } \
 146 } while (0)
 147
 148 #define SCM_THREAD_REALLOW_1
 149 #define SCM_THREAD_REALLOW_2 \
 150 do { \
 151   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 152   pthread_mutex_unlock (&scm_critical_section_mutex); \
 153 } while (0)
 154
 155 #endif
 156
 157 #define SCM_THREAD_SWITCHING_CODE
 158
 159 #define SCM_THREAD_LOCAL_DATA (pthread_self () -> attr.arg_attr)
 160 #define SCM_SET_THREAD_LOCAL_DATA(new_root) \
 161 do { \
 162   pthread_t t = pthread_self (); \
 163   void *r = (new_root); \
 164   pthread_attr_setcleanup (&t -> attr, NULL, r); \
 165   pthreads_find_info (t) -> root = r; \
 166 } while (0)
 167
 168
 169 \f
 170
 171 void scm_threads_init_mit_pthreads ();
 172
 173 typedef struct QUEUE {
 174   struct QUEUE *flink, *blink;
 175 } queue;
 176
 177 extern pthread_mutex_t scm_critical_section_mutex;
 178 extern pthread_t scm_critical_section_owner;
 179
 180 /* Key to thread specific data */
 181 extern pthread_key_t info_key;
 182
 183 struct scm_pthread_create_info_type
 184 {
 185   SCM thunk;
 186   SCM error;
 187   SCM *prots;
 188 } scm_pthread_create_info;
 189
 190 #endif /* MIT_PTHREADSH */