6b262d2094
Change-Id: Ibf639695ebd99c11c6960c9be82c0cee71b50744 BUG: 905864 Signed-off-by: Krishnan Parthasarathi <kparthas@redhat.com> Reviewed-on: http://review.gluster.org/4458 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Anand Avati <avati@redhat.com>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pthread.h>
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pthread_t th[5] = {0};
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void
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flock_init (struct flock *f, short int type, off_t start, off_t len)
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{
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f->l_type = type;
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f->l_start = start;
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f->l_len = len;
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}
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int
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flock_range_in_steps (int fd, int is_set, short l_type,
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int start, int end, int step)
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{
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int ret = 0;
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int i = 0;
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struct flock f = {0,};
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for (i = start; i+step < end; i += step) {
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flock_init (&f, l_type, i, step);
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ret = fcntl (fd, (is_set)? F_SETLKW:F_GETLK, &f);
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if (ret) {
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perror ("fcntl");
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goto out;
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}
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}
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out:
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return ret;
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}
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void *
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random_locker (void *arg)
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{
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int fd = *(int *)arg;
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int i = 0;
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int is_set = 0;
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/* use thread id to choose GETLK or SETLK operation*/
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is_set = pthread_self () % 2;
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(void)flock_range_in_steps (fd, is_set, F_WRLCK, 0, 400, 1);
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return NULL;
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}
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int main (int argc, char **argv)
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{
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int fd = -1;
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int ret = 1;
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int i = 0;
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char *fname = NULL;
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if (argc < 2)
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goto out;
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fname = argv[1];
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fd = open (fname, O_RDWR);
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if (fd == -1) {
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perror ("open");
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goto out;
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}
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ret = flock_range_in_steps (fd, 1, F_WRLCK, 0, 2000, 2);
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for (i = 0; i < 5; i++) {
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pthread_create (&th[i], NULL, random_locker, (void *) &fd);
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}
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ret = flock_range_in_steps (fd, 1, F_WRLCK, 0, 2000, 2);
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for (i = 0; i < 5; i++) {
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pthread_join (th[i], NULL);
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}
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out:
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if (fd != -1)
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close (fd);
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return ret;
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}
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