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