libguile/threads.c

   1 /*      Copyright (C) 1995, 1996, 1997 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
  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 /* This file does some pretty hairy #inclusion.  It probably seemed
  44    like a good idea at the time, but it doesn't now.  Here's the
  45    structure, edited for relevance (!), last I checked:
  46
  47       threads.c:
  48         threads.h
  49           coop-defs.h
  50             iselect.h
  51         mit-pthreads.c
  52         coop-threads.c
  53           coop-threads.h
  54             coop-defs.h*
  55             ../qt/qt.h
  56           coop.c
  57             <qt.h>
  58
  59 */
  60
  61 #include <stdio.h>
  62 #include "_scm.h"
  63 #include "dynwind.h"
  64 #include "smob.h"
  65
  66 #include "threads.h"
  67
  68 \f
  69
  70 long scm_tc16_thread;
  71
  72 long scm_tc16_mutex;
  73
  74 long scm_tc16_condvar;
  75
  76 \f
  77 /* Scheme-visible thread functions. */
  78
  79 #ifdef USE_COOP_THREADS
  80 SCM_PROC(s_single_thread_p, "single-active-thread?", 0, 0, 0, scm_single_thread_p);
  81 #endif
  82 SCM_PROC(s_yield, "yield", 0, 0, 0, scm_yield);
  83 SCM_PROC(s_call_with_new_thread, "call-with-new-thread", 0, 0, 1, scm_call_with_new_thread);
  84 SCM_PROC(s_join_thread, "join-thread", 1, 0, 0, scm_join_thread);
  85 SCM_PROC(s_make_mutex, "make-mutex", 0, 0, 0, scm_make_mutex);
  86 SCM_PROC(s_lock_mutex, "lock-mutex", 1, 0, 0, scm_lock_mutex);
  87 SCM_PROC(s_unlock_mutex, "unlock-mutex", 1, 0, 0, scm_unlock_mutex);
  88 SCM_PROC(s_make_condition_variable, "make-condition-variable", 0, 0, 0, scm_make_condition_variable);
  89 SCM_PROC(s_wait_condition_variable, "wait-condition-variable", 2, 0, 0, scm_wait_condition_variable);
  90 SCM_PROC(s_signal_condition_variable, "signal-condition-variable", 1, 0, 0, scm_signal_condition_variable);
  91
  92 \f
  93
  94 #ifdef USE_MIT_PTHREADS
  95 #include "mit-pthreads.c"
  96 #endif
  97
  98 #ifdef USE_COOP_THREADS
  99 #include "coop-threads.c"
 100 #endif
 101
 102 static int
 103 print_thread (exp, port, pstate)
 104      SCM exp;
 105      SCM port;
 106      scm_print_state *pstate;
 107 {
 108   scm_puts ("#<thread ", port);
 109   scm_intprint (SCM_CDR (exp), 16, port);
 110   scm_putc ('>', port);
 111   return 1;
 112 }
 113
 114 static scm_smobfuns thread_smob =
 115 {
 116   0,
 117   scm_threads_free_thread,
 118   print_thread,
 119   0
 120 };
 121
 122 static int
 123 print_mutex (exp, port, pstate)
 124      SCM exp;
 125      SCM port;
 126      scm_print_state *pstate;
 127 {
 128   scm_puts ("#<mutex ", port);
 129   scm_intprint (SCM_CDR (exp), 16, port);
 130   scm_putc ('>', port);
 131   return 1;
 132 }
 133
 134 static scm_smobfuns mutex_smob =
 135 {
 136   0,
 137   scm_threads_free_mutex,
 138   print_mutex,
 139   0
 140 };
 141
 142 static int
 143 print_condvar (exp, port, pstate)
 144      SCM exp;
 145      SCM port;
 146      scm_print_state *pstate;
 147 {
 148   scm_puts ("#<condition-variable ", port);
 149   scm_intprint (SCM_CDR (exp), 16, port);
 150   scm_putc ('>', port);
 151   return 1;
 152 }
 153
 154 static scm_smobfuns condvar_smob =
 155 {
 156   0,
 157   scm_threads_free_condvar,
 158   print_condvar,
 159   0
 160 };
 161
 162 \f
 163
 164 #ifdef __STDC__
 165 void
 166 scm_init_threads (SCM_STACKITEM *i)
 167 #else
 168 void
 169 scm_init_threads (i)
 170      SCM_STACKITEM *i;
 171 #endif
 172 {
 173   scm_tc16_thread = scm_newsmob (&thread_smob);
 174   scm_tc16_mutex = scm_newsmob (&mutex_smob);
 175   scm_tc16_condvar = scm_newsmob (&condvar_smob);
 176 #include "threads.x"
 177   /* Initialize implementation specific details of the threads support */
 178   scm_threads_init (i);
 179 }