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159 lines
4.2 KiB
159 lines
4.2 KiB
/*
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*
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* Copyright (c) International Business Machines Corp., 2002
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*
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* This program 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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* the 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* FILE : sem02.c
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*
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* DESCRIPTION : The application creates several threads using pthread_create().
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* One thread performs a semop() with the SEM_UNDO flag set. The change in
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* sempaphore value performed by that semop should be "undone" only when the
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* last pthread exits.
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*
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* EXPECTED OUTPUT:
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* Waiter, pid = <pid#>
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* Poster, pid = <pid#>, posting
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* Poster posted
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* Poster exiting
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* Waiter waiting, pid = <pid#>
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* Waiter done waiting
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*
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* HISTORY:
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* written by Dave Olien (oliend@us.ibm.com)
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* 03/06/2002 Robbie Williamson (robbiew@us.ibm.com)
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* -ported
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* 07/04/2003 Paul Larson (plars@linuxtestproject.org)
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* -ported to LTP
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/sem.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include "lapi/semun.h"
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#include "test.h"
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#define KEY IPC_PRIVATE
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#define NUMTHREADS 2
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void *retval[NUMTHREADS];
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void *waiter(void *);
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void *poster(void *);
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void cleanup(void);
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char *TCID = "sem02";
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int TST_TOTAL = 1;
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struct sembuf Psembuf = { 0, -1, SEM_UNDO };
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struct sembuf Vsembuf = { 0, 1, SEM_UNDO };
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int sem_id;
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int err_ret; /* This is used to determine PASS/FAIL status */
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int main(int argc, char **argv)
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{
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int i, rc;
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union semun semunion;
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pthread_t pt[NUMTHREADS];
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pthread_attr_t attr;
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tst_parse_opts(argc, argv, NULL, NULL);
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/* Create the semaphore set */
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sem_id = semget(KEY, 1, 0666 | IPC_CREAT);
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if (sem_id < 0) {
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printf("semget failed, errno = %d\n", errno);
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exit(1);
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}
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/* initialize data structure associated to the semaphore */
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semunion.val = 1;
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semctl(sem_id, 0, SETVAL, semunion);
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/* setup the attributes of the thread */
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/* set the scope to be system to make sure the threads compete on a */
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/* global scale for cpu */
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pthread_attr_init(&attr);
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pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
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err_ret = 1; /* Set initial error value to 1 */
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/* Create the threads */
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for (i = 0; i < NUMTHREADS; i++) {
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if (i == 0)
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rc = pthread_create(&pt[i], &attr, waiter, retval[i]);
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else
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rc = pthread_create(&pt[i], &attr, poster, retval[i]);
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}
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/* Sleep long enough to see that the other threads do what they are supposed to do */
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sleep(20);
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semunion.val = 1;
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semctl(sem_id, 0, IPC_RMID, semunion);
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if (err_ret == 1)
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tst_resm(TFAIL, "failed");
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else
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tst_resm(TPASS, "passed");
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cleanup();
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tst_exit();
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}
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/* This thread sleeps 10 seconds then waits on the semaphore. As long
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as someone has posted on the semaphore, and no undo has taken
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place, the semop should complete and we'll print "Waiter done
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waiting." */
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void *waiter(void *foo)
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{
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int pid;
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pid = getpid();
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tst_resm(TINFO, "Waiter, pid = %d", pid);
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sleep(10);
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tst_resm(TINFO, "Waiter waiting, pid = %d", pid);
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semop(sem_id, &Psembuf, 1);
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tst_resm(TINFO, "Waiter done waiting");
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err_ret = 0; /* If the message above is displayed, the test is a PASS */
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pthread_exit(0);
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}
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/* This thread immediately posts on the semaphore and then immediately
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exits. If the *thread* exits, the undo should not happen, and the
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waiter thread which will start waiting on it in 10 seconds, should
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still get it. */
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void *poster(void *foo)
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{
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int pid;
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pid = getpid();
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tst_resm(TINFO, "Poster, pid = %d, posting", pid);
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semop(sem_id, &Vsembuf, 1);
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tst_resm(TINFO, "Poster posted");
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tst_resm(TINFO, "Poster exiting");
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pthread_exit(0);
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}
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void cleanup(void)
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{
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}
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