libguile/fsu-pthreads.h

   1 /*      Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
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  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 #ifndef SCM_FSU_PTHREADS_H
  44 #define SCM_FSU_PTHREADS_H
  45
  46 #define PTHREAD_KERNEL
  47 #include <pthread.h>
  48
  49 /* Identify where the stack pointer can be found in a jmpbuf.
  50  */
  51
  52 #if defined(__sparc_setjmp_h)
  53 #  define THREAD_SP machdep_data.machdep_state[2]
  54 #endif
  55
  56 #if defined(linux)
  57 #  define THREAD_SP machdep_data.machdep_state[0].__sp
  58 #endif
  59
  60 #if defined(sgi)
  61 #  define THREAD_SP machdep_data.machdep_state[JB_SP]
  62 #endif
  63
  64 /*  ...define THREAD_SP for your architecture here...
  65  */
  66
  67 #if !defined(THREAD_SP)
  68 --> where is your stack pointer?
  69 #endif
  70
  71 \f
  72
  73 #define PTHREAD_MAX_PRIORITY 64
  74
  75 \f
  76
  77 /* Boost the priority of this thread so that it is the only
  78    one running. PTHREAD_MAX_PRIORITY is reserved for this
  79    purpose */
  80
  81 #define SCM_THREAD_CRITICAL_SECTION_START \
  82   struct sched_param param; \
  83   int previous_prio; \
  84   int policy; \
  85   pthread_getschedparam(pthread_self(), &policy, &param); \
  86   previous_prio = param.prio; \
  87   param.prio = PTHREAD_MAX_PRIORITY; \
  88   pthread_setschedparam(pthread_self(), policy, &param)
  89
  90 #define SCM_THREAD_CRITICAL_SECTION_END \
  91   param.prio = previous_prio; \
  92   pthread_setschedparam(pthread_self(), policy, &param)
  93
  94 #define SCM_THREAD_INITIALIZE_STORAGE \
  95   scm_threads_init_mit_pthreads ()
  96
  97 \f
  98
  99 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 100
 101 #define SCM_DEFER_INTS \
 102 { \
 103   SCM_IASSERT(scm_critical_section_owner != pthread_self()); \
 104   pthread_mutex_lock(&scm_critical_section_mutex); \
 105   scm_critical_section_owner = pthread_self(); \
 106   scm_ints_disabled = 1; \
 107 }
 108
 109 #define SCM_ALLOW_INTS \
 110 { \
 111   SCM_IASSERT(scm_critical_section_owner == pthread_self()); \
 112   scm_ints_disabled = 0; \
 113   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 114   pthread_mutex_unlock(&scm_critical_section_mutex); \
 115   SCM_CHECK_INTS; \
 116 }
 117
 118 #define SCM_REDEFER_INTS \
 119 { \
 120   if ((scm_critical_section_owner != pthread_self()) || \
 121       (scm_critical_section_owner == SCM_NO_CRITICAL_SECTION_OWNER)) \
 122     { \
 123       pthread_mutex_lock(&scm_critical_section_mutex); \
 124       scm_critical_section_owner = pthread_self(); \
 125     } \
 126   ++scm_ints_disabled; \
 127 }
 128
 129 #define SCM_REALLOW_INTS \
 130 { \
 131   SCM_IASSERT(scm_critical_section_owner == pthread_self()); \
 132   --scm_ints_disabled; \
 133   if (!scm_ints_disabled) \
 134     { \
 135       scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 136       pthread_mutex_unlock(&scm_critical_section_mutex); \
 137       SCM_CHECK_INTS; \
 138     } \
 139 }
 140
 141 *fixme*
 142 #define scm_root ((scm_root_state *) pthread_self()->prots)
 143 #define scm_set_root(new_root) (pthread_self()->prots = (new_root))
 144
 145 \f
 146
 147 void scm_threads_init_mit_pthreads ();
 148
 149 typedef struct QUEUE {
 150   struct QUEUE *flink, *blink;
 151 } queue;
 152
 153 extern pthread_mutex_t scm_critical_section_mutex;
 154 extern pthread_t scm_critical_section_owner;
 155
 156 /* Key to thread specific data */
 157 extern pthread_key_t info_key;
 158
 159 struct scm_pthread_create_info_type
 160 {
 161   SCM thunk;
 162   SCM error;
 163   SCM *prots;
 164 } scm_pthread_create_info;
 165
 166 #endif