* BUG? timer_create() with SIGEV_THREAD not working (at least on ppc64) @ 2008-11-18 16:14 Chris Friesen 2008-11-18 20:33 ` Chris Friesen 0 siblings, 1 reply; 3+ messages in thread From: Chris Friesen @ 2008-11-18 16:14 UTC (permalink / raw) To: linuxppc-dev, linux-kernel, tglx The code below sets up a simple timer with SIGEV_THREAD. I compiled the code as "g++ timertest.cc -o timertest -lrt -pthread". Running it on my G5 with 2.6.27 (but with an older glibc), it prints: Creating timer Setting timer 268509264 for 5-second expiration... and then the timer never expires. I have an old Fedora Core 4 x86 machine and there it works as expected. Is there some hard requirement to upgrade glibc? If not, then this looks like a bug somewhere. Thanks, Chris int main(void) { timer_t timer_id; struct itimerspec its; struct sigevent se; // set timer signal event se.sigev_notify = SIGEV_THREAD; se.sigev_value.sival_ptr = &timer_id; se.sigev_notify_function = handler; se.sigev_notify_attributes = NULL; if ( timer_create(CLOCK_REALTIME, &se, &timer_id) < 0) { printf("create timer failed\n"); fflush(0); return 0; } // set timer. its.it_value.tv_sec = 1; its.it_value.tv_nsec = 0; its.it_interval.tv_sec = 1; its.it_interval.tv_nsec = 0; if ( timer_settime(timer_id, 0, &its, NULL) < 0) { printf("set timer failed\n"); fflush(0); return 0; } printf("set timer OK\n"); fflush(0); while(1) { pause();} return 0; } ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: BUG? timer_create() with SIGEV_THREAD not working (at least on ppc64) 2008-11-18 16:14 BUG? timer_create() with SIGEV_THREAD not working (at least on ppc64) Chris Friesen @ 2008-11-18 20:33 ` Chris Friesen 2008-11-18 23:06 ` Chris Friesen 0 siblings, 1 reply; 3+ messages in thread From: Chris Friesen @ 2008-11-18 20:33 UTC (permalink / raw) To: Chris Friesen; +Cc: linuxppc-dev, linux-kernel, tglx Chris Friesen wrote: > The code below sets up a simple timer with SIGEV_THREAD. I compiled the > code as "g++ timertest.cc -o timertest -lrt -pthread". > > Running it on my G5 with 2.6.27 (but with an older glibc), it prints: > > Creating timer > Setting timer 268509264 for 5-second expiration... > > and then the timer never expires. I have an old Fedora Core 4 x86 > machine and there it works as expected. > > Is there some hard requirement to upgrade glibc? If not, then this > looks like a bug somewhere. I'm getting suspicious of either glibc or my version of strace, as it shows the child thread calling rt_sigtimedwait() with an empty signal set. clone(Process 2663 attached child_stack=0xf7ffe6c0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0xf7ffeb68, tls=0xf8005f80, child_tidptr=0xf7ffeb68) = 2663 [pid 2662] futex(0xf5f11a4, FUTEX_WAKE, 2147483647) = 0 [pid 2662] timer_create(0, {0x10011050, 32, SIGEV_THREAD_ID, {2663}}, {(nil)}) = 0 [pid 2662] timer_settime(0, , {it_interval={1, 0}, it_value={1, 0}}, <unfinished ...> [pid 2663] rt_sigprocmask(SIG_BLOCK, [RTMIN], <unfinished ...> [pid 2662] <... timer_settime resumed> NULL) = 0 [pid 2662] fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 [pid 2663] <... rt_sigprocmask resumed> NULL, 8) = 0 [pid 2662] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...> [pid 2663] rt_sigtimedwait([], <unfinished ...> [pid 2662] <... mmap resumed> ) = 0xf7ffa000 [pid 2662] write(1, "set timer OK\n", 13set timer OK Chris ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: BUG? timer_create() with SIGEV_THREAD not working (at least on ppc64) 2008-11-18 20:33 ` Chris Friesen @ 2008-11-18 23:06 ` Chris Friesen 0 siblings, 0 replies; 3+ messages in thread From: Chris Friesen @ 2008-11-18 23:06 UTC (permalink / raw) To: Chris Friesen; +Cc: linuxppc-dev, linux-kernel, tglx Chris Friesen wrote: > I'm getting suspicious of either glibc or my version of strace, as it > shows the child thread calling rt_sigtimedwait() with an empty signal set. Looks like glibc was the culprit. It works fine with a newer version. Sorry for the false alarm. Chris ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2008-11-18 23:07 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2008-11-18 16:14 BUG? timer_create() with SIGEV_THREAD not working (at least on ppc64) Chris Friesen 2008-11-18 20:33 ` Chris Friesen 2008-11-18 23:06 ` Chris Friesen
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