File:  [gforth] / gforth / engine / select.c
Revision 1.4: download - view: text, annotated - select for diffs
Sun Dec 13 23:30:03 1998 UTC (23 years ago) by pazsan
Branches: MAIN
CVS tags: v0-4-0, HEAD
Added some documentation (files stup, blocks stub, Mini-OOF implementation)
Added Benchres for my machine
made DOS and Win32 compile and run
New gforthmi.bat script for DOS - needs a temporary file for the commands
instead of the -e option.
Added select.o again for DOS (DJGPP's select is broken wrt timing)
Improved select.c
Bug with DOS: engine-ditc doesn't compile with optimization on. Maybe I need
to get a new GCC version for DOS?

/* select replacement for DOS computers for ms only

  Copyright (C) 1995,1998 Free Software Foundation, Inc.

  This file is part of Gforth.

  Gforth is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include <sys/time.h>

int select(int n, fd_set *a, fd_set *b, fd_set *c, struct timeval * timeout)
{
   struct timeval time1;
   struct timeval time2;
   struct timezone zone1;

   gettimeofday(&time1,&zone1);
   time1.tv_sec += timeout->tv_sec;
   time1.tv_usec += timeout->tv_usec;
   if(time1.tv_usec >= 1000000) {
     time1.tv_sec += time1.tv_usec / 1000000;
     time1.tv_usec %= 1000000;
   }
   do {
     gettimeofday(&time2,&zone1);
   } while((time2.tv_sec < time1.tv_sec) ||
           ((time2.tv_usec < time1.tv_usec) &&
	    (time2.tv_sec == time1.tv_sec)));
}

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