libguile/null-threads.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_NULL_THREADS_H
   4 #define SCM_NULL_THREADS_H
   5
   6 /* Copyright (C) 2002 Free Software Foundation, Inc.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library 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 GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 \f
  24
  25 /* The null-threads implementation.  We provide the standard API, but
  26    no new threads can be created.
  27 */
  28
  29 #error temporarily broken, compile with threads enabled (default option)
  30
  31 /* We can't switch so don't bother trying.
  32 */
  33 #undef  SCM_THREAD_SWITCHING_CODE
  34 #define SCM_THREAD_SWITCHING_CODE
  35
  36 #define scm_t_thread int
  37
  38 /* The "(void)(...)" constructs in the expansions are there to ensure
  39    that the side effects of the argument expressions take place.
  40 */
  41
  42 #define scm_thread_create(th,proc,data) ((void)(proc), (void)(data), ENOTSUP)
  43 #define scm_thread_join(th)             do { (void)(th); abort(); } while(0)
  44 #define scm_thread_detach(th)           do { (void)(th); abort(); } while(0)
  45 #define scm_thread_self()               0
  46
  47 #define scm_t_mutex int
  48
  49 #define scm_mutex_init(mx)              do { (void)(mx); } while(0)
  50 #define scm_mutex_destroy(mx)           do { (void)(mx); } while(0)
  51 #define scm_mutex_lock(mx)              do { (void)(mx); } while(0)
  52 #define scm_mutex_trylock(mx)           ((void)(mx), 1)
  53 #define scm_mutex_unlock(mx)            do { (void)(mx); } while(0)
  54
  55 #define scm_t_cond int
  56
  57 #define scm_cond_init(cv)               do { (void)(cv); } while(0)
  58 #define scm_cond_destroy(cv)            do { (void)(cv); } while(0)
  59 #define scm_cond_wait(cv,mx)            ((void)(cv), (void)(mx), ENOTSUP)
  60 #define scm_cond_timedwait(cv,mx,at)    ((void)(cv), (void)(mx), (void)(at), \
  61                                          ENOTSUP)
  62 #define scm_cond_signal(cv)             do { (void)(cv); } while(0)
  63 #define scm_cond_broadcast(cv)          do { (void)(cv); } while(0)
  64
  65 #define scm_thread_select               select
  66
  67 typedef void **scm_t_key;
  68
  69 #define scm_key_create(keyp)            do { *(keyp) = malloc(sizeof(void*)); \
  70                                            } while(0)
  71 #define scm_key_delete(key)             do { free(key); } while(0)
  72 #define scm_key_setspecific(key, value) do { *(key) = (value); } while(0)
  73 #define scm_key_getspecific(key)        *(key)
  74
  75 #if 0
  76
  77 /* These are the actual prototypes of the functions/macros defined
  78    above.  We list them here for reference. */
  79
  80 typedef int scm_t_thread;
  81
  82 SCM_API int  scm_thread_create (scm_t_thread *th,
  83                                 void (*proc) (void *), void *data);
  84 SCM_API void scm_thread_join (scm_t_thread th);
  85 SCM_API void scm_thread_detach (scm_t_thread th);
  86 SCM_API scm_t_thread scm_thread_self (void);
  87
  88 typedef int scm_t_mutex;
  89
  90 SCM_API void scm_mutex_init (scm_t_mutex *mx);
  91 SCM_API void scm_mutex_destroy (scm_t_mutex *mx);
  92 SCM_API void scm_mutex_lock (scm_t_mutex *mx);
  93 SCM_API int  scm_mutex_trylock (scm_t_mutex *mx);
  94 SCM_API void scm_mutex_unlock (scm_t_mutex *mx);
  95
  96 typedef int scm_t_cond;
  97
  98 SCM_API void scm_cond_init (scm_t_cond *cv);
  99 SCM_API void scm_cond_destroy (scm_t_cond *cv);
 100 SCM_API void scm_cond_wait (scm_t_cond *cv, scm_t_mutex *mx);
 101 SCM_API int  scm_cond_timedwait (scm_t_cond *cv, scm_t_mutex *mx,
 102                                  scm_t_timespec *abstime);
 103 SCM_API void scm_cond_signal (scm_t_cond *cv);
 104 SCM_API void scm_cond_broadcast (scm_t_cond *cv);
 105
 106 typedef int scm_t_key;
 107
 108 SCM_API void scm_key_create (scm_t_key *keyp);
 109 SCM_API void scm_key_delete (scm_t_key key);
 110 SCM_API void scm_key_setspecific (scm_t_key key, const void *value);
 111 SCM_API void *scm_key_getspecific (scm_t_key key);
 112
 113 SCM_API int  scm_thread_select (int nfds,
 114                                 SELECT_TYPE *readfds,
 115                                 SELECT_TYPE *writefds,
 116                                 SELECT_TYPE *exceptfds,
 117                                 struct timeval *timeout);
 118
 119 #endif
 120
 121 #endif  /* SCM_NULL_THREADS_H */
 122
 123 /*
 124   Local Variables:
 125   c-file-style: "gnu"
 126   End:
 127 */