mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 20:00:19 +02:00
58ade1022c
chars.h, continuations.h, debug-malloc.h, dynl.c, feature.c, feature.h, filesys.h, fluids.h, fports.h, gc_os_dep.c, gdb_interface.h, gh_eval.c, gh_funcs.c, gh_io.c, gh_list.c, gh_predicates.c, gsubr.c, gsubr.h, guardians.h, guile-func-name-check.in, guile-snarf-docs-texi.in, guile-snarf-docs.in, guile-snarf.awk.in, guile-snarf.in, hashtab.h, iselect.h, keywords.h, lang.c, list.h, load.h, objprop.c, objprop.h, options.c, options.h, random.h, regex-posix.h, root.c, root.h, script.c, snarf.h, stackchk.c, strerror.c, strop.h, strports.h, threads.h, values.c, values.h, version.c, version.h: Updated copyright notice.
141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/* Copyright (C) 1995,1996, 1997, 2000, 2001 Free Software Foundation, Inc.
|
||
*
|
||
* This program is free software; you can redistribute it and/or modify
|
||
* it under the terms of the GNU General Public License as published by
|
||
* the Free Software Foundation; either version 2, or (at your option)
|
||
* any later version.
|
||
*
|
||
* This program 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 General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with this software; see the file COPYING. If not, write to
|
||
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
|
||
* Boston, MA 02111-1307 USA
|
||
*
|
||
* As a special exception, the Free Software Foundation gives permission
|
||
* for additional uses of the text contained in its release of GUILE.
|
||
*
|
||
* The exception is that, if you link the GUILE library with other files
|
||
* to produce an executable, this does not by itself cause the
|
||
* resulting executable to be covered by the GNU General Public License.
|
||
* Your use of that executable is in no way restricted on account of
|
||
* linking the GUILE library code into it.
|
||
*
|
||
* This exception does not however invalidate any other reasons why
|
||
* the executable file might be covered by the GNU General Public License.
|
||
*
|
||
* This exception applies only to the code released by the
|
||
* Free Software Foundation under the name GUILE. If you copy
|
||
* code from other Free Software Foundation releases into a copy of
|
||
* GUILE, as the General Public License permits, the exception does
|
||
* not apply to the code that you add in this way. To avoid misleading
|
||
* anyone as to the status of such modified files, you must delete
|
||
* this exception notice from them.
|
||
*
|
||
* If you write modifications of your own for GUILE, it is your choice
|
||
* whether to permit this exception to apply to your modifications.
|
||
* If you do not wish that, delete this exception notice. */
|
||
|
||
|
||
|
||
|
||
#include "libguile/_scm.h"
|
||
#include "libguile/ports.h"
|
||
#include "libguile/smob.h"
|
||
|
||
#include "libguile/validate.h"
|
||
#include "libguile/arbiters.h"
|
||
|
||
|
||
/* {Arbiters}
|
||
*
|
||
* These procedures implement synchronization primitives. Processors
|
||
* with an atomic test-and-set instruction can use it here (and not
|
||
* SCM_DEFER_INTS).
|
||
*/
|
||
|
||
static scm_t_bits scm_tc16_arbiter;
|
||
|
||
|
||
#define SCM_ARB_LOCKED(arb) ((SCM_CELL_WORD_0 (arb)) & (1L << 16))
|
||
#define SCM_LOCK_ARB(arb) (SCM_SET_CELL_WORD_0 ((arb), scm_tc16_arbiter | (1L << 16)));
|
||
#define SCM_UNLOCK_ARB(arb) (SCM_SET_CELL_WORD_0 ((arb), scm_tc16_arbiter));
|
||
|
||
static int
|
||
arbiter_print (SCM exp, SCM port, scm_print_state *pstate)
|
||
{
|
||
scm_puts ("#<arbiter ", port);
|
||
if (SCM_ARB_LOCKED (exp))
|
||
scm_puts ("locked ", port);
|
||
scm_iprin1 (SCM_PACK (SCM_SMOB_DATA (exp)), port, pstate);
|
||
scm_putc ('>', port);
|
||
return !0;
|
||
}
|
||
|
||
SCM_DEFINE (scm_make_arbiter, "make-arbiter", 1, 0, 0,
|
||
(SCM name),
|
||
"Return an object of type arbiter and name @var{name}. Its\n"
|
||
"state is initially unlocked. Arbiters are a way to achieve\n"
|
||
"process synchronization.")
|
||
#define FUNC_NAME s_scm_make_arbiter
|
||
{
|
||
SCM_RETURN_NEWSMOB (scm_tc16_arbiter, SCM_UNPACK (name));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_try_arbiter, "try-arbiter", 1, 0, 0,
|
||
(SCM arb),
|
||
"Return @code{#t} and lock the arbiter @var{arb} if the arbiter\n"
|
||
"was unlocked. Otherwise, return @code{#f}.")
|
||
#define FUNC_NAME s_scm_try_arbiter
|
||
{
|
||
SCM_VALIDATE_SMOB (1, arb, arbiter);
|
||
SCM_DEFER_INTS;
|
||
if (SCM_ARB_LOCKED(arb))
|
||
arb = SCM_BOOL_F;
|
||
else
|
||
{
|
||
SCM_LOCK_ARB(arb);
|
||
arb = SCM_BOOL_T;
|
||
}
|
||
SCM_ALLOW_INTS;
|
||
return arb;
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
|
||
SCM_DEFINE (scm_release_arbiter, "release-arbiter", 1, 0, 0,
|
||
(SCM arb),
|
||
"Return @code{#t} and unlock the arbiter @var{arb} if the\n"
|
||
"arbiter was locked. Otherwise, return @code{#f}.")
|
||
#define FUNC_NAME s_scm_release_arbiter
|
||
{
|
||
SCM_VALIDATE_SMOB (1, arb, arbiter);
|
||
if (!SCM_ARB_LOCKED(arb))
|
||
return SCM_BOOL_F;
|
||
SCM_UNLOCK_ARB (arb);
|
||
return SCM_BOOL_T;
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
|
||
|
||
void
|
||
scm_init_arbiters ()
|
||
{
|
||
scm_tc16_arbiter = scm_make_smob_type ("arbiter", 0);
|
||
scm_set_smob_mark (scm_tc16_arbiter, scm_markcdr);
|
||
scm_set_smob_print (scm_tc16_arbiter, arbiter_print);
|
||
#ifndef SCM_MAGIC_SNARFER
|
||
#include "libguile/arbiters.x"
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
Local Variables:
|
||
c-file-style: "gnu"
|
||
End:
|
||
*/
|