On 2012-05-22 13:02, Corinna Vinschen wrote: [...] >> Testcase signal/kill: >> Signals may or may not reach the correct thread with 1.7.12-1 and newer. > > Confirmed. I think the reason is that we only have a single event to > signal that a POSIX signal arrived instead of a per-thread event, but > I'm not sure. This is cgf's domain so I leave it at that for now.
Is this problem still in the queue? The newest snapshot yields the same results as before. $ uname -srv CYGWIN_NT-6.1-WOW64 1.7.16s(0.261/5/3) 20120708 00:52:15 I attached a slightly simpler version of the testcase. Test output: Sending SIGUSR1 to thread 2 Thread 0 encountered an error: Interrupted system call Sending SIGUSR1 to thread 1 Thread 1 executes signal handler Thread 1 encountered an error: Interrupted system call Sending SIGUSR1 to thread 0 Thread 2 executes signal handler Thread 2 encountered an error: Interrupted system call Otto
#include <errno.h> #include <pthread.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> pthread_t tids[3]; static void* simplethread(void *arg) { int *intptr = (int*)arg; pthread_t self = pthread_self(); fprintf(stderr, "Thread %i starting (%p)\n", *intptr, self); while (1) { if (pause() != 0) { fprintf(stderr, "Thread %i encountered an error: %s (%p)\n", *intptr, strerror(errno), self); } else { fprintf(stderr, "Thread %i woke up just fine\n", *intptr); } } return NULL; } static void sigusr1_handler(int signal __attribute((unused))) { pthread_t self = pthread_self(); // Search for thread number int tnum = 0; while (tnum < 3) { if (tids[tnum] == self) { break; } tnum++; } fprintf(stderr, "Thread %i executes signal handler (%p)\n", tnum, self); } static void install_handler(void) { struct sigaction act; act.sa_handler = &sigusr1_handler; sigemptyset(&(act.sa_mask)); act.sa_flags = 0; // Install signal handler if (sigaction(SIGUSR1, &act, NULL) != 0) { fprintf(stderr, "Can't set signal handler: %s\n", strerror(errno)); exit(1); } // Make sure SIGUSR1 is not blocked sigset_t sset; sigemptyset(&sset); sigaddset(&sset, SIGUSR1); if (sigprocmask(SIG_UNBLOCK, &sset, NULL) != 0) { fprintf(stderr, "Can't unblock SIGUSR1: %s\n", strerror(errno)); } } int main() { fprintf(stderr, "Testing pthread_kill()\n\n"); int i; int result; install_handler(); // Create threads for (i=0; i<3; i++) { int *intptr = (int*)malloc(sizeof(int)); *intptr = i; result = pthread_create(tids+i, NULL, &simplethread, intptr); if (result != 0) { fprintf(stderr, "Can't create thread: %s\n", strerror(result)); return 1; } } sleep(1); install_handler(); fprintf(stderr, "\n"); // Poke all threads for (i=2; i>=0; i--) { fprintf(stderr, "Sending SIGUSR1 to thread %i (%p)\n", i, tids[i]); result = pthread_kill(tids[i], SIGUSR1); if (result != 0) { fprintf(stderr, "Error during pthread_kill: %s\n", strerror(result)); } sleep(1); fprintf(stderr, "\n"); } return 0; }
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