Hi, Sorry about this repost but I'm confused about the responses I received in my last post so I'm looking for some clarification.
Specifically, I though I could use the kqueue timer as essentially a "drop in" replacement for linuxfd_create/read, but was surprised that the accuracy of the kqueue timer is much less than what I need for my application. So my confusion at this point is whether this is consider to be a bug or "feature"? Here's some test code if you want to verify the problem: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <sys/event.h> #include <sys/time.h> int main(void) { int i,msec; int kq,nev; struct kevent inqueue; struct kevent outqueue; struct timeval start,end; if ((kq = kqueue()) == -1) { fprintf(stderr, "kqueue error!? errno = %s", strerror(errno)); exit(EXIT_FAILURE); } EV_SET(&inqueue, 1, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0, 20, 0); gettimeofday(&start, 0); for (i = 0; i < 50; i++) { if ((nev = kevent(kq, &inqueue, 1, &outqueue, 1, NULL)) == -1) { fprintf(stderr, "kevent error!? errno = %s", strerror(errno)); exit(EXIT_FAILURE); } else if (outqueue.flags & EV_ERROR) { fprintf(stderr, "EV_ERROR: %s\n", strerror(outqueue.data)); exit(EXIT_FAILURE); } } gettimeofday(&end, 0); msec = ((end.tv_sec - start.tv_sec) * 1000) + (((1000000 + end.tv_usec - start.tv_usec) / 1000) - 1000); printf("msec = %d\n", msec); close(kq); return EXIT_SUCCESS; } -- Paul Albrecht _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"