libguile/futures.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_FUTURES_H
   4 #define SCM_FUTURES_H
   5
   6 /* Copyright (C) 2002, 2003 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 #include "libguile/__scm.h"
  26 #include "libguile/threads.h"
  27
  28 \f
  29
  30 typedef struct scm_t_future {
  31   SCM data;
  32   scm_i_pthread_mutex_t mutex;
  33   scm_i_pthread_cond_t cond;
  34   int status;
  35   int die_p;
  36 } scm_t_future;
  37
  38 #define SCM_FUTURE_DEAD 0
  39 #define SCM_FUTURE_SIGNAL_ME -1
  40 #define SCM_FUTURE_COMPUTING 1
  41 #define SCM_FUTURE_TASK_ASSIGNED 2
  42
  43 #define SCM_VALIDATE_FUTURE(pos, obj) \
  44   SCM_ASSERT_TYPE (SCM_TYP16_PREDICATE (scm_tc16_future, obj), \
  45                    obj, pos, FUNC_NAME, "future");
  46 #define SCM_FUTURE(future) ((scm_t_future *) SCM_SMOB_DATA_2 (future))
  47 #define SCM_FUTURE_MUTEX(future) (&SCM_FUTURE (future)->mutex)
  48 #define SCM_FUTURE_COND(future) (&SCM_FUTURE (future)->cond)
  49 #define SCM_FUTURE_STATUS(future) (SCM_FUTURE (future)->status)
  50 #define SCM_SET_FUTURE_STATUS(future, x) \
  51  do { SCM_FUTURE (future)->status = (x); } while (0)
  52 #define SCM_FUTURE_ALIVE_P(future) (SCM_FUTURE_STATUS (future))
  53 #define SCM_FUTURE_DATA(future) (SCM_FUTURE (future)->data)
  54 #define SCM_SET_FUTURE_DATA(future, x) \
  55  do { SCM_FUTURE (future)->data = (x); } while (0)
  56 #define SCM_FUTURE_NEXT       SCM_SMOB_OBJECT
  57 #define SCM_FUTURE_NEXTLOC    SCM_SMOB_OBJECT_LOC
  58 #define SCM_SET_FUTURE_NEXT   SCM_SET_SMOB_OBJECT
  59
  60 SCM_API scm_t_bits scm_tc16_future;
  61
  62 extern SCM *scm_loc_sys_thread_handler;
  63
  64 SCM_API SCM scm_i_make_future (SCM thunk);
  65 SCM_API SCM scm_make_future (SCM thunk);
  66 SCM_API SCM scm_future_ref (SCM future);
  67
  68 void scm_init_futures (void);
  69
  70 #endif  /* SCM_FUTURES_H */
  71
  72 /*
  73   Local Variables:
  74   c-file-style: "gnu"
  75   End:
  76 */