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
  33  * GUILE, as the General Public License permits, the exception does
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  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
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44 \f
  45
  46 #ifndef SCM_FSU_PTHREADS_H
  47 #define SCM_FSU_PTHREADS_H
  48
  49 #define PTHREAD_KERNEL
  50 #include <pthread.h>
  51
  52 /* Identify where the stack pointer can be found in a jmpbuf.
  53  */
  54
  55 #if defined(__sparc_setjmp_h)
  56 #  define THREAD_SP machdep_data.machdep_state[2]
  57 #endif
  58
  59 #if defined(linux)
  60 #  define THREAD_SP machdep_data.machdep_state[0].__sp
  61 #endif
  62
  63 #if defined(sgi)
  64 #  define THREAD_SP machdep_data.machdep_state[JB_SP]
  65 #endif
  66
  67 /*  ...define THREAD_SP for your architecture here...
  68  */
  69
  70 #if !defined(THREAD_SP)
  71 --> where is your stack pointer?
  72 #endif
  73
  74 \f
  75
  76 #define PTHREAD_MAX_PRIORITY 64
  77
  78 \f
  79
  80 /* Boost the priority of this thread so that it is the only
  81    one running. PTHREAD_MAX_PRIORITY is reserved for this
  82    purpose */
  83
  84 #define SCM_THREAD_CRITICAL_SECTION_START \
  85   struct sched_param param; \
  86   int previous_prio; \
  87   int policy; \
  88   pthread_getschedparam(pthread_self(), &policy, &param); \
  89   previous_prio = param.prio; \
  90   param.prio = PTHREAD_MAX_PRIORITY; \
  91   pthread_setschedparam(pthread_self(), policy, &param)
  92
  93 #define SCM_THREAD_CRITICAL_SECTION_END \
  94   param.prio = previous_prio; \
  95   pthread_setschedparam(pthread_self(), policy, &param)
  96
  97 #define SCM_THREAD_INITIALIZE_STORAGE \
  98   scm_threads_init_mit_pthreads ()
  99
 100 \f
 101
 102 #define SCM_NO_CRITICAL_SECTION_OWNER 0
 103
 104 #define SCM_DEFER_INTS \
 105 do { \
 106   SCM_IASSERT(scm_critical_section_owner != pthread_self()); \
 107   pthread_mutex_lock(&scm_critical_section_mutex); \
 108   scm_critical_section_owner = pthread_self(); \
 109   scm_ints_disabled = 1; \
 110 } while (0)
 111
 112 #define SCM_ALLOW_INTS \
 113 do { \
 114   SCM_IASSERT(scm_critical_section_owner == pthread_self()); \
 115   scm_ints_disabled = 0; \
 116   scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 117   pthread_mutex_unlock(&scm_critical_section_mutex); \
 118   SCM_CHECK_INTS; \
 119 } while (0)
 120
 121 #define SCM_REDEFER_INTS \
 122 do { \
 123   if ((scm_critical_section_owner != pthread_self()) || \
 124       (scm_critical_section_owner == SCM_NO_CRITICAL_SECTION_OWNER)) \
 125     { \
 126       pthread_mutex_lock(&scm_critical_section_mutex); \
 127       scm_critical_section_owner = pthread_self(); \
 128     } \
 129   ++scm_ints_disabled; \
 130 } while (0)
 131
 132 #define SCM_REALLOW_INTS \
 133 do { \
 134   SCM_IASSERT(scm_critical_section_owner == pthread_self()); \
 135   --scm_ints_disabled; \
 136   if (!scm_ints_disabled) \
 137     { \
 138       scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
 139       pthread_mutex_unlock(&scm_critical_section_mutex); \
 140       SCM_CHECK_INTS; \
 141     } \
 142 } while (0)
 143
 144 *fixme*
 145 #define scm_root ((scm_root_state *) pthread_self()->prots)
 146 #define scm_set_root(new_root) (pthread_self()->prots = (new_root))
 147
 148 \f
 149
 150 void scm_threads_init_mit_pthreads ();
 151
 152 typedef struct QUEUE {
 153   struct QUEUE *flink, *blink;
 154 } queue;
 155
 156 extern pthread_mutex_t scm_critical_section_mutex;
 157 extern pthread_t scm_critical_section_owner;
 158
 159 /* Key to thread specific data */
 160 extern pthread_key_t info_key;
 161
 162 struct scm_pthread_create_info_type
 163 {
 164   SCM thunk;
 165   SCM error;
 166   SCM *prots;
 167 } scm_pthread_create_info;
 168
 169 #endif