89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2015 Giacomo Tesio <giacomo@tesio.it>
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*
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* Jehanne is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <u.h>
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#include <lib9.h>
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/* Test alarm(2):
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* - alarms replace each other (the last one wins)
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* - alarms are received as notes
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* - alarms are received (more or less) on time
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*
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* Given we have two clocks at work here, we can use one to
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* check the other:
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* - nsec() is an high resolution clock from RDTSC instruction
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* (see sysproc.c, portclock.c and tod.c in sys/src/9/port)
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* - sys->ticks incremented by hzclock (in portclock.c) that
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* is used by alarm (and sleep and the kernel scheduler)
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*/
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int verbose = 0;
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int64_t alarmReceived;
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int
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printFirst(void *v, char *s)
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{
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/* just not exit, please */
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if(strcmp(s, "alarm") == 0){
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alarmReceived = nsec();
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if(verbose)
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fprint(2, "%d: noted: %s at %lld\n", getpid(), s, nsec());
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atnotify(printFirst, 0);
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return 1;
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}
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return 0;
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}
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int
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failOnSecond(void *v, char *s)
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{
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/* just not exit, please */
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if(strcmp(s, "alarm") == 0){
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print("FAIL\n");
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exits("FAIL");
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}
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return 0;
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}
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void
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main(void)
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{
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int64_t a2000, a500;
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if (!atnotify(printFirst, 1) || !atnotify(failOnSecond, 1)){
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fprint(2, "%r\n");
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exits("atnotify fails");
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}
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alarm(2000);
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a2000 = nsec();
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alarm(500);
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a500 = nsec();
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rendezvous(&a500, (void*)0x123);
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if(verbose)
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fprint(2, "%d: set alarm(2000)@%lld then alarm(500)@%lld; received after %lld nanosecond\n", getpid(), a2000, a500, alarmReceived-a500);
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if(alarmReceived-a500 > 700 * 1000 * 1000){
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print("FAIL\n");
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exits("FAIL");
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}
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print("PASS\n");
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exits("PASS");
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}
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