jehanne/qa/kern/sched0.c

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/*
* This file is part of Jehanne.
*
* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
*
* Jehanne 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, version 2 of the License.
*
* Jehanne 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 Jehanne. If not, see <http://www.gnu.org/licenses/>.
*/
#include <u.h>
#include <libc.h>
/* verify that the scheduler give each process a chance to run
* with a single cpu (x86) this test do not pass on plan9/9front
* (last check on 2016-10-03).
*/
int spin;
void
main(void)
{
rfork(RFNOTEG);
switch(rfork(RFPROC|RFMEM)){
case -1:
exits("rfork");
case 0:
spin = 1;
while(spin)
;
exits(nil);
default:
while(spin == 0)
;
}
switch(rfork(RFPROC|RFMEM)){
case -1:
exits("rfork");
case 0:
spin = 2;
while(spin)
;
exits(nil);
default:
while(spin == 1)
;
}
spin = 0;
sleep(500);
print("PASS\n");
exits("PASS");
}