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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.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/_scm.h"
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#include "libguile/ports.h"
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#include "libguile/smob.h"
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#include "libguile/validate.h"
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#include "libguile/arbiters.h"
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/* {Arbiters}
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*
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* These procedures implement synchronization primitives. Processors
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* with an atomic test-and-set instruction can use it here (and not
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* SCM_DEFER_INTS).
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*/
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static scm_t_bits scm_tc16_arbiter;
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#define SCM_ARB_LOCKED(arb) ((SCM_CELL_WORD_0 (arb)) & (1L << 16))
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#define SCM_LOCK_ARB(arb) (SCM_SET_CELL_WORD_0 ((arb), scm_tc16_arbiter | (1L << 16)));
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#define SCM_UNLOCK_ARB(arb) (SCM_SET_CELL_WORD_0 ((arb), scm_tc16_arbiter));
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static int
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arbiter_print (SCM exp, SCM port, scm_print_state *pstate)
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{
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scm_puts ("#<arbiter ", port);
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if (SCM_ARB_LOCKED (exp))
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scm_puts ("locked ", port);
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scm_iprin1 (SCM_PACK (SCM_SMOB_DATA (exp)), port, pstate);
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scm_putc ('>', port);
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return !0;
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}
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SCM_DEFINE (scm_make_arbiter, "make-arbiter", 1, 0, 0,
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(SCM name),
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"Return an object of type arbiter and name @var{name}. Its\n"
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"state is initially unlocked. Arbiters are a way to achieve\n"
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"process synchronization.")
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#define FUNC_NAME s_scm_make_arbiter
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{
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SCM_RETURN_NEWSMOB (scm_tc16_arbiter, SCM_UNPACK (name));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_try_arbiter, "try-arbiter", 1, 0, 0,
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(SCM arb),
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"Return @code{#t} and lock the arbiter @var{arb} if the arbiter\n"
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"was unlocked. Otherwise, return @code{#f}.")
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#define FUNC_NAME s_scm_try_arbiter
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{
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SCM_VALIDATE_SMOB (1, arb, arbiter);
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SCM_DEFER_INTS;
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if (SCM_ARB_LOCKED(arb))
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arb = SCM_BOOL_F;
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else
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{
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SCM_LOCK_ARB(arb);
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arb = SCM_BOOL_T;
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}
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SCM_ALLOW_INTS;
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return arb;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_release_arbiter, "release-arbiter", 1, 0, 0,
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(SCM arb),
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"Return @code{#t} and unlock the arbiter @var{arb} if the\n"
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"arbiter was locked. Otherwise, return @code{#f}.")
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#define FUNC_NAME s_scm_release_arbiter
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{
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SCM_VALIDATE_SMOB (1, arb, arbiter);
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if (!SCM_ARB_LOCKED(arb))
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return SCM_BOOL_F;
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SCM_UNLOCK_ARB (arb);
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return SCM_BOOL_T;
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}
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#undef FUNC_NAME
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void
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scm_init_arbiters ()
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{
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scm_tc16_arbiter = scm_make_smob_type ("arbiter", 0);
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scm_set_smob_mark (scm_tc16_arbiter, scm_markcdr);
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scm_set_smob_print (scm_tc16_arbiter, arbiter_print);
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#ifndef SCM_MAGIC_SNARFER
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#include "libguile/arbiters.x"
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#endif
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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