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Speccy ClassiX 1998
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gcc
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ixemulsrc.lha
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ixemul-41.4
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get_file.c
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C/C++ Source or Header
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1995-05-17
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73 lines
/*
* This file is part of ixemul.library for the Amiga.
* Copyright (C) 1991, 1992 Markus M. Wild
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* get_file.c,v 1.1.1.1 1994/04/04 04:30:58 amiga Exp
*
* get_file.c,v
* Revision 1.1.1.1 1994/04/04 04:30:58 amiga
* Initial CVS check in.
*
* Revision 1.2 1992/08/09 20:45:35 amiga
* add new sleep parameter
*
* Revision 1.1 1992/05/14 19:55:40 mwild
* Initial revision
*
*/
#define KERNEL
#include "ixemul.h"
int
__get_file (struct file *f)
{
int res = 0;
Forbid ();
for (;;)
{
if (!(f->f_sync_flags & FSFF_LOCKED))
{
f->f_sync_flags |= FSFF_LOCKED;
/* got it ! */
break;
}
f->f_sync_flags |= FSFF_WANTLOCK;
if (ix_sleep (& f->f_sync_flags, "get_file") < 0) /* error in sleep, might be INTR */
{
res = -1;
break;
}
/* have to always recheck whether we really got the lock */
}
Permit ();
return res;
}
void
__release_file (struct file *f)
{
Forbid ();
if (f->f_sync_flags & FSFF_WANTLOCK)
ix_wakeup (& f->f_sync_flags);
f->f_sync_flags &= ~(FSFF_WANTLOCK|FSFF_LOCKED);
Permit ();
}