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/* classes: h_files */
#ifndef SCM_FUTURES_H
#define SCM_FUTURES_H
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if 0
/* Futures have the following known bugs, which should be fixed before
including them in Guile:
- The implementation of the thread cache needs to be better so that
it behaves reasonable under heavy use.
- The dynamic state of a thread needs to be properly initialized
when it is retrieved from the cache.
*/
#include "libguile/__scm.h"
#include "libguile/threads.h"
typedef struct scm_t_future {
SCM data;
scm_i_pthread_mutex_t mutex;
scm_i_pthread_cond_t cond;
int status;
int die_p;
} scm_t_future;
#define SCM_FUTURE_DEAD 0
#define SCM_FUTURE_SIGNAL_ME -1
#define SCM_FUTURE_COMPUTING 1
#define SCM_FUTURE_TASK_ASSIGNED 2
#define SCM_VALIDATE_FUTURE(pos, obj) \
SCM_ASSERT_TYPE (SCM_TYP16_PREDICATE (scm_tc16_future, obj), \
obj, pos, FUNC_NAME, "future");
#define SCM_FUTURE(future) ((scm_t_future *) SCM_SMOB_DATA_2 (future))
#define SCM_FUTURE_MUTEX(future) (&SCM_FUTURE (future)->mutex)
#define SCM_FUTURE_COND(future) (&SCM_FUTURE (future)->cond)
#define SCM_FUTURE_STATUS(future) (SCM_FUTURE (future)->status)
#define SCM_SET_FUTURE_STATUS(future, x) \
do { SCM_FUTURE (future)->status = (x); } while (0)
#define SCM_FUTURE_ALIVE_P(future) (SCM_FUTURE_STATUS (future))
#define SCM_FUTURE_DATA(future) (SCM_FUTURE (future)->data)
#define SCM_SET_FUTURE_DATA(future, x) \
do { SCM_FUTURE (future)->data = (x); } while (0)
#define SCM_FUTURE_NEXT SCM_SMOB_OBJECT
#define SCM_FUTURE_NEXTLOC SCM_SMOB_OBJECT_LOC
#define SCM_SET_FUTURE_NEXT SCM_SET_SMOB_OBJECT
SCM_API scm_t_bits scm_tc16_future;
extern SCM *scm_loc_sys_thread_handler;
SCM_API SCM scm_i_make_future (SCM thunk);
SCM_API SCM scm_make_future (SCM thunk);
SCM_API SCM scm_future_ref (SCM future);
void scm_init_futures (void);
#endif /* Futures are disabled for now. */
#endif /* SCM_FUTURES_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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