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/* Copyright (C) 1992, 1994 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: gpcheck.h,v 1.9 2004/08/13 12:59:03 stefan Exp $ */
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/* Interrupt check interface */
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#ifndef gpcheck_INCLUDED
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# define gpcheck_INCLUDED
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/*
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* On some platforms, the interpreter must check periodically for user-
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* initiated actions. (Eventually, this may be extended to all platforms,
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* to handle multi-tasking through the 'context' facility.) Routines that
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* run for a long time must periodically call gp_check_interrupts(), and
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* if it returns true, must clean up whatever they are doing and return an
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* e_interrupted (or gs_error_interrupted) exceptional condition.
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* The return_if_interrupt macro provides a convenient way to do this.
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*
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* On platforms that require an interrupt check, the makefile defines
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* a symbol CHECK_INTERRUPTS. Currently this is only the Microsoft
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* Windows platform.
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*/
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int gs_return_check_interrupt(const gs_memory_t *mem, int code);
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#ifdef CHECK_INTERRUPTS
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int gp_check_interrupts(const gs_memory_t *mem);
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# define process_interrupts(mem) discard(gp_check_interrupts(mem))
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# define return_if_interrupt(mem)\
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{ int icode_ = gp_check_interrupts(mem); \
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if ( icode_ )\
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return gs_note_error((icode_ > 0 ? gs_error_interrupt : icode_));\
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}
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# define return_check_interrupt(mem, code) \
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return gs_return_check_interrupt(mem, code)
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# define set_code_on_interrupt(mem, pcode) \
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if (*(pcode) == 0)\
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*(pcode) = (gp_check_interrupts(mem) != 0) ? gs_error_interrupt : 0;
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#else
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# define gp_check_interrupts(mem) 0
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# define process_interrupts(mem) DO_NOTHING
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# define return_if_interrupt(mem) DO_NOTHING
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# define return_check_interrupt(mem, code) \
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return (code)
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# define set_code_on_interrupt(mem, code) DO_NOTHING
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#endif
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#endif /* gpcheck_INCLUDED */
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