129 lines
2.7 KiB
C
129 lines
2.7 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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QLock rl;
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Rendez rStart;
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Rendez rCompleted;
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int64_t elapsedInWaiter, resInWaiter;
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int verbose = 0;
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int
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failOnTimeout(void *v, char *s)
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{
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if(strncmp(s, "alarm", 4) == 0){
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if(verbose)
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print("%d: noted: %s\n", getpid(), s);
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print("FAIL: timeout\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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spawnWaiter(Lock *l)
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{
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int pid;
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int64_t start;
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switch((pid = rfork(RFMEM|RFPROC|RFNOWAIT)))
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{
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case 0:
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/* wait for the alwaysLocked to be locked by the main process */
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qlock(&rl);
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while(resInWaiter == 0xff)
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rsleep(&rStart);
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start = nsec();
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resInWaiter = lockt(l, 6000);
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elapsedInWaiter = (nsec() - start) / (1000 * 1000);
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if(verbose)
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print("lockt returned %d, elapsed = %d ms\n", resInWaiter, elapsedInWaiter);
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rwakeup(&rCompleted);
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qunlock(&rl);
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exits(0);
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break;
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case -1:
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print("spawnWaiter: %r\n");
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exits("rfork fails");
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break;
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default:
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if(verbose)
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print("spawn waiter %d\n", pid);
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break;
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}
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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 start, elapsed, res;
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static Lock l;
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rfork(RFNOTEG|RFREND);
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rStart.l = &rl;
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rCompleted.l = &rl;
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resInWaiter = 0xff;
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spawnWaiter(&l);
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jehanne_lock(&l);
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alarm(20000); /* global timeout, FAIL if reached */
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if (!atnotify(failOnTimeout, 1)){
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fprint(2, "%r\n");
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exits("atnotify fails");
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}
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/* verify that lockt returns 0 on timeout */
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start = nsec();
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res = lockt(&l, 1000);
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elapsed = (nsec() - start) / (1000 * 1000);
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if(verbose)
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print("lockt returned %d, elapsed = %d ms\n", res, elapsed);
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if(res != 0 || elapsed < 900 || elapsed > 1300){
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print("FAIL: lockt timeout\n");
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exits("FAIL");
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}
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/* verify that lockt returns 1 if the lock is released and
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* it can take it
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*/
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resInWaiter = -1;
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qlock(&rl);
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rwakeupall(&rStart);
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qunlock(&rl);
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sleep(1200);
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jehanne_unlock(&l);
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qlock(&rl);
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while(elapsedInWaiter == 0)
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rsleep(&rCompleted);
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qunlock(&rl);
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if(resInWaiter != 1 || elapsedInWaiter < 1100 || elapsedInWaiter > 1500){
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print("FAIL: lockt delayed acquisition\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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