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/* Copyright (C) 1998 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gpsync.h,v 1.5 2002/06/16 06:59:02 lpd Exp $ */
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/* Interface to platform-dependent synchronization primitives */
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#if !defined(gpsync_INCLUDED)
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# define gpsync_INCLUDED
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/* Initial version 4/1/98 by John Desrosiers (soho@crl.com). */
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/* 8/9/98 L. Peter Deutsch (ghost@aladdin.com) Changed ...sizeof to
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procedures, added some comments. */
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/* -------- Synchronization primitives ------- */
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/*
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* Semaphores support wait/signal semantics: a wait operation will allow
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* control to proceed iff the number of signals since semaphore creation
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* is greater than the number of waits.
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*/
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typedef struct {
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void *dummy_;
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} gp_semaphore;
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uint gp_semaphore_sizeof(void);
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/*
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* Hack: gp_semaphore_open(0) succeeds iff it's OK for the memory manager
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* to move a gp_semaphore in memory.
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*/
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int gp_semaphore_open(gp_semaphore * sema);
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int gp_semaphore_close(gp_semaphore * sema);
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int gp_semaphore_wait(gp_semaphore * sema);
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int gp_semaphore_signal(gp_semaphore * sema);
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/*
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* Monitors support enter/leave semantics: at most one thread can have
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* entered and not yet left a given monitor.
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*/
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typedef struct {
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void *dummy_;
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} gp_monitor;
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uint gp_monitor_sizeof(void);
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/*
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* Hack: gp_monitor_open(0) succeeds iff it's OK for the memory manager
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* to move a gp_monitor in memory.
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*/
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int gp_monitor_open(gp_monitor * mon);
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int gp_monitor_close(gp_monitor * mon);
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int gp_monitor_enter(gp_monitor * mon);
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int gp_monitor_leave(gp_monitor * mon);
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/*
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* A new thread starts by calling a procedure, passing it a void * that
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* allows it to gain access to whatever data it needs.
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*/
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typedef void (*gp_thread_creation_callback_t) (void *);
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int gp_create_thread(gp_thread_creation_callback_t, void *);
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#endif /* !defined(gpsync_INCLUDED) */
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