libguile/null-threads.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_NULL_DEFS_H
   4 #define SCM_NULL_DEFS_H
   5
   6 /* Copyright (C) 2002 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 \f
  48
  49 /* The null-threads implementation.  We provide the standard API, but
  50    no new threads can be created.
  51 */
  52
  53 #define SCM_CRITICAL_SECTION_START
  54 #define SCM_CRITICAL_SECTION_END
  55 #define SCM_THREAD_SWITCHING_CODE
  56
  57 typedef struct scm_null_mutex {
  58   int locked;
  59 } scm_null_mutex;
  60
  61 SCM_API int scm_null_mutex_init (scm_null_mutex *);
  62 SCM_API int scm_null_mutex_lock (scm_null_mutex *);
  63 SCM_API int scm_null_mutex_unlock (scm_null_mutex *);
  64 SCM_API int scm_null_mutex_destroy (scm_null_mutex *);
  65
  66 typedef scm_null_mutex scm_t_mutex;
  67 #define scm_mutex_init scm_null_mutex_init
  68 #define scm_mutex_lock scm_null_mutex_lock
  69 #define scm_mutex_unlock scm_null_mutex_unlock
  70
  71 typedef struct scm_null_condvar {
  72   int signalled;
  73 } scm_null_condvar;
  74
  75 SCM_API int scm_null_condvar_init (scm_null_condvar *);
  76 SCM_API int scm_null_condvar_wait (scm_null_condvar *, scm_null_mutex *);
  77 SCM_API int scm_null_condvar_signal (scm_null_condvar *);
  78 SCM_API int scm_null_condvar_destroy (scm_null_condvar *);
  79
  80 typedef scm_null_condvar scm_t_condvar;
  81 #define scm_cond_init scm_null_condvar_init
  82 #define scm_cond_wait scm_null_condvar_wait
  83 #define scm_cond_signal scm_null_condvar_signal
  84 #define scm_cond_broadcast scm_null_condvar_signal /* yes */
  85 #define scm_cond_destroy scm_null_condvar_destroy
  86
  87 SCM_API void *scm_null_threads_data;
  88
  89 #define SCM_THREAD_LOCAL_DATA          (scm_null_threads_data)
  90 #define SCM_SET_THREAD_LOCAL_DATA(ptr) (scm_null_threads_data = (ptr))
  91
  92 #endif  /* SCM_NULL_DEFS_H */
  93
  94 /*
  95   Local Variables:
  96   c-file-style: "gnu"
  97   End:
  98 */