jehanne/qa/lib/c/sleep.c

91 lines
2.2 KiB
C

/*
* This file is part of Jehanne.
*
* Copyright (C) 2015 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 <lib9.h>
/* Test sleep(2):
* - sleep cannot be interrupted
* - sleep give back the control (more or less) on time
*
* Given we have two clocks at work here, we can use one to
* check the other:
* - nsec() is an high resolution clock from RDTSC instruction
* (see sysproc.c, portclock.c and tod.c in sys/src/9/port)
* - sys->ticks incremented by hzclock (in portclock.c) that
* is used by alarm (and sleep and the kernel scheduler)
*/
int verbose = 0;
int
printFirst(void *v, char *s)
{
/* just not exit, please */
if(strcmp(s, "alarm") == 0){
if(verbose)
fprint(2, "%d: noted: %s at %lld\n", getpid(), s, nsec());
atnotify(printFirst, 0);
return 1;
}
return 0;
}
int
failOnSecond(void *v, char *s)
{
/* just not exit, please */
if(strcmp(s, "alarm") == 0){
print("FAIL\n");
exits("FAIL");
}
return 0;
}
void
main(void)
{
int64_t a2000, a500, tStart, tEnd;
if (!atnotify(printFirst, 1) || !atnotify(failOnSecond, 1)){
fprint(2, "%r\n");
exits("atnotify fails");
}
sys_alarm(2000);
a2000 = nsec();
sys_alarm(500);
a500 = nsec();
tStart = nsec();
sleep(1000);
tEnd = nsec();
if(verbose)
fprint(2, "%d: set sys_alarm(2000)@%lld then sys_alarm(500)@%lld; elapsed in sleep() %lld nanosecond\n", getpid(), a2000, a500, tEnd-tStart);
if(tEnd-tStart > 1200 * 1000 * 1000){
print("FAIL: should sleep less\n");
exits("FAIL");
}
if(tEnd-tStart < 800 * 1000 * 1000){
print("FAIL: should sleep more\n");
exits("FAIL");
}
print("PASS\n");
exits("PASS");
}