site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com I've now explored every variant I can think of for using kevent with EVFILT_TIMER. If I read kevent(2) properly the default implementation for the TIMER is to set a repeating timeout that can fire every ident timeperiods and delivers a EVFILT_TIMER event. Yet only ever get one hit, immediately and the event never fires again. Is this a documentation problem or am I missing something? Here is the code that demonstrates the problem, not that it never returns after the initial immediate and incorrect kevents. I'm running a vanilla x86_64 macbook pro with 10.6.2. Please help, this problem has been screwing me over for the last week. Godfrey /* gcc -std=c99 -Wall -Wextra -Werror -g -o kevent_timer kevent_timer.c */ #include <sys/cdefs.h> #include <assert.h> #include <errno.h> #include <stdio.h> #include <stdbool.h> #include <strings.h> #include <sys/time.h> #include <sys/event.h> #define kLongTimer_ms (1000) #define kShortTimer_ms ( 10) static struct timeval sStart; static int sKQ; static void logKEvent(const struct kevent64_s *kep, int ind, const char * const pfx); int main(int argc __unused, char *argv[] __unused) { sKQ = kqueue(); gettimeofday(&sStart, NULL); uintptr_t nch = 0; struct kevent64_s timers[2]; EV_SET64(&timers[nch], kLongTimer_ms, EVFILT_TIMER, EV_ADD, 0, 0, nch, 0, 0); nch++; EV_SET64(&timers[nch], kShortTimer_ms, EVFILT_TIMER, EV_ADD, 0, 0, nch, 0, 0); nch++; struct kevent64_s *chList = timers; bool seenLong = false, seenShort = false; do { struct kevent64_s evList[2]; bzero(evList, sizeof(evList)); for (int i = 0; i < (int) nch; i++) logKEvent(&chList[i], i, "change"); int nev = kevent64(sKQ, chList, nch, evList, 2, 0, NULL); chList = NULL; nch = 0; for (int i = 0; i < nev; i++) { struct kevent64_s *kevp = &evList[i]; logKEvent(kevp, i, "kev"); assert(kevp->filter == EVFILT_TIMER); if (kevp->udata == 0) seenLong = true; else if (kevp->udata == 1) seenShort = true; else assert(false); }; if (seenLong && seenShort && !(timers[0].flags & EV_CLEAR)) { seenLong = seenShort = false; chList = timers; nch = sizeof(timers)/sizeof(timers[0]); for (int i = 0; i < (int) nch; i++) chList[i].flags = EV_ADD|EV_CLEAR; }; } while ( true ); // } while ( !seenLong || !seenShort ); } static void logKEvent(const struct kevent64_s *kep, int ind, const char * const pfx) { static const char *sFilterNames[] = { "EVNULL", "EVFILT_READ", "EVFILT_WRITE", "EVFILT_AIO", "EVFILT_VNODE", "EVFILT_PROC", "EVFILT_SIGNAL", "EVFILT_TIMER", "EVFILT_MACHPORT", "EVFILT_FS", "EVFILT_USER", "EVFILT_SESSION" }; // 1 2 3 4 5 6 7 // 12345678901234567890123456789012345678901234567890123456789012345678901234567 // ADD|DELETE|ENABLE|DISABLE|ONESHOT|CLEAR|RECEIPT|DISPATCH|BAD0x0100|BAD0x0200| // 8 9 10 11 // 890123456789012345678901234567890123456789 // BAD0x0400|BAD0x0800|FLAG1|FLAG2|ERROR|EOF0 #define kMaxFlagCharacters 119 static const char *sFlagNames[] = { "ADD", "DELETE", "ENABLE", "DISABLE", "ONESHOT", "CLEAR", "RECEIPT", "DISPATCH", "BAD0x0100", "BAD0x0200", "BAD0x0400", "BAD0x0800", "FLAG1", "FLAG2", "ERROR", "EOF" }; char flagBuffer[kMaxFlagCharacters], *cp = flagBuffer; int cc; #define kNumFilterNames (sizeof(sFilterNames)/sizeof(sFilterNames[0])) #define kNumFlagNames (sizeof(sFlagNames) /sizeof(sFlagNames[0])) #define kNumFlagChars (sizeof(flagBuffer) /sizeof(flagBuffer[0])) cp[0] = '\0'; for (size_t i = 0; i < kNumFlagNames; i++) { cc = 0; if ( kep->flags & (1 << i) ) cc = sprintf(cp, "%s|", sFlagNames[i]); cp += cc; } cp[-1] = '\0'; // Overwrite trailing | assert(cp < &flagBuffer[kNumFlagChars]); unsigned filter = - kep->filter; assert(filter < kNumFilterNames); struct timeval delta; gettimeofday(&delta, NULL); timersub(&delta, &sStart, &delta); fprintf(stderr, "%7ldus: %s[%d] = { %lld, %s, %s, %x, %lld }\n", delta.tv_sec * 1000 * 1000 + delta.tv_usec, pfx, ind, kep->ident, sFilterNames[filter], flagBuffer, kep->fflags, kep->data); } _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com