kopia lustrzana https://gitlab.com/sane-project/backends
110 wiersze
3.7 KiB
C
110 wiersze
3.7 KiB
C
/* sane - Scanner Access Now Easy.
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Copyright (C) 1998-2001 Yuri Dario
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This file is part of the SANE package.
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SANE is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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SANE is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with sane; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE 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
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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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
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, 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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*/
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/** @file sanei_thread.h
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* Header file to make porting fork, wait, and waitpid easier.
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*
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* This file contains helper functions for the OS/2 port (using threads
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* instead of forked processes). <b>Do not use these functions in the backends
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* directly</b>, they are used automatically by macros. Just include this file
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* in an \#ifdef HAVE_OS2_H statement if you use fork. If your reader process
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* has more than one argument, you also need to implement a
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* os2_reader_process() in your backend. The implementation should call your
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* own reader process. See mustek.c for an example.
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*
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* The preprocessor is used for routing process-related function to OS/2
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* threaded code: in this way, Unix backends requires only minimal code
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* changes.
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*
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* @sa sanei.h sanei_backend.h
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*/
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#ifndef sanei_thread_h
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#define sanei_thread_h
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#include "../include/sane/config.h"
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/** @name Internal functions
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* @{
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*/
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extern void sanei_thread_init( void );
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/** <b>Do not use in backends</b>
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*
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* Wrapper for @c fork.
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*/
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extern int sanei_thread_begin( void (*start)(void *arg), void* arg_list);
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/** <b>Do not use in backends</b>
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*
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* Wrapper for @c kill.
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*/
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extern int sanei_thread_kill( int pid, int sig);
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/** <b>Do not use in backends</b>
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*
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* Wrapper for @c waitpid.
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*/
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extern int sanei_thread_waitpid( int pid, int *stat_loc, int options);
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/** <b>Do not use in backends</b>
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*
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* Wrapper for @c wait.
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*/
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extern int sanei_thread_wait( int *stat_loc);
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/* @} */
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/** Reader process function.
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*
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* This wrapper is necessary if a backend's reader process need more than one
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* argument. Add a function to you backend with this name and let it call your
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* own reader process. See mustek.c for an example.
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*/
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#ifdef HAVE_OS2_H
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static void os2_reader_process( void* data);
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#define fork() sanei_thread_begin( os2_reader_process)
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#define kill( a, b) sanei_thread_kill( a,b)
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#define waitpid( a, b, c) sanei_thread_waitpid( a, b, c)
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#endif
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#endif /* sanei_thread_h */
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