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) 2005, 2006, 2010 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 License
  10  * as published by the Free Software Foundation; either version 3 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * 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., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  */
  23
  24 \f
  25
  26 /* The null-threads implementation.  We provide the subset of the
  27    standard pthread API that is used by Guile, but no new threads can
  28    be created.
  29
  30    This file merely exits so that Guile can be compiled and run
  31    without using pthreads.  Improving performance via optimizations
  32    that are possible in a single-threaded program is not a primary
  33    goal.
  34 */
  35
  36 #include <stdlib.h>
  37 #include <errno.h>
  38
  39 /* Threads
  40 */
  41 #define scm_i_pthread_t                     int
  42 #define scm_i_pthread_self()                0
  43 #define scm_i_pthread_create(t,a,f,d)       (*(t)=0, (void)(f), ENOSYS)
  44 #define scm_i_pthread_detach(t)             do { } while (0)
  45 #define scm_i_pthread_exit(v)               exit (EXIT_SUCCESS)
  46 #define scm_i_pthread_cancel(t)             0
  47 #define scm_i_pthread_cleanup_push(t,v)     0
  48 #define scm_i_pthread_cleanup_pop(e)        0
  49 #define scm_i_sched_yield()                 0
  50
  51 /* Signals
  52  */
  53 #define scm_i_pthread_sigmask               sigprocmask
  54
  55 /* Mutexes
  56  */
  57 #define SCM_I_PTHREAD_MUTEX_INITIALIZER     0
  58 #define scm_i_pthread_mutex_t               int
  59 #define scm_i_pthread_mutex_init(m,a)       (*(m) = 0)
  60 #define scm_i_pthread_mutex_destroy(m)      do { (void)(m); } while(0)
  61 #define scm_i_pthread_mutex_trylock(m)      ((*(m))++)
  62 #define scm_i_pthread_mutex_lock(m)         ((*(m))++)
  63 #define scm_i_pthread_mutex_unlock(m)       ((*(m))--)
  64 #define scm_i_pthread_mutexattr_recursive   0
  65
  66 /* Condition variables
  67  */
  68 #define SCM_I_PTHREAD_COND_INITIALIZER      0
  69 #define scm_i_pthread_cond_t                int
  70 #define scm_i_pthread_cond_init(c,a)        (*(c) = 0)
  71 #define scm_i_pthread_cond_destroy(c)       do { (void)(c); } while(0)
  72 #define scm_i_pthread_cond_signal(c)        (*(c) = 1)
  73 #define scm_i_pthread_cond_broadcast(c)     (*(c) = 1)
  74 #define scm_i_pthread_cond_wait(c,m)        (abort(), 0)
  75 #define scm_i_pthread_cond_timedwait(c,m,t) (abort(), 0)
  76
  77 /* Onces
  78  */
  79 #define scm_i_pthread_once_t                int
  80 #define SCM_I_PTHREAD_ONCE_INIT             0
  81 #define scm_i_pthread_once(o,f)             do { \
  82                                               if(!*(o)) { *(o)=1; f (); } \
  83                                             } while(0)
  84
  85 /* Thread specific storage
  86  */
  87 typedef struct scm_i_pthread_key_t {
  88   struct scm_i_pthread_key_t *next;
  89   void *value;
  90   void (*destr_func) (void *);
  91 } scm_i_pthread_key_t;
  92
  93 SCM_API int scm_i_pthread_key_create (scm_i_pthread_key_t *key,
  94                                       void (*destr_func) (void *));
  95 #define scm_i_pthread_setspecific(k,p)      ((k).value = (p))
  96 #define scm_i_pthread_getspecific(k)        ((k).value)
  97
  98 /* Convenience functions
  99  */
 100 #define scm_i_scm_pthread_mutex_lock        scm_i_pthread_mutex_lock
 101 #define scm_i_dynwind_pthread_mutex_lock    scm_i_pthread_mutex_lock
 102 #define scm_i_scm_pthread_cond_wait         scm_i_pthread_cond_wait
 103 #define scm_i_scm_pthread_cond_timedwait    scm_i_pthread_cond_timedwait
 104
 105
 106 #endif  /* SCM_NULL_THREADS_H */
 107
 108 /*
 109   Local Variables:
 110   c-file-style: "gnu"
 111   End:
 112 */