Hi Dave, This patch adds the shared pending signal queue to the private pending signal queue. With the following small variation on procsig.c, we get this result: ============================================================ crash> sig 5747 PID: 5747 TASK: f7827020 CPU: 1 COMMAND: "procsig" SIGNAL_STRUCT: f7d71380 COUNT: 1 SIG SIGACTION HANDLER MASK FLAGS [1] f7833384 SIG_DFL 0000000000000000 0 [...] [64] f7833870 804867a 0000000000000000 0 SIGPENDING: no SIGNAL: 0000000200000800 BLOCKED: 8000000200000800 SIGQUEUE: SIG SIGINFO 12 f4d74ed4 34 f4d74e40 SHARED_PENDING SIGNAL: 8000000000000800 SIGQUEUE: SIG SIGINFO 12 f4d74060 64 f4d740f4 64 f4d74188 ============================================================ #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <linux/unistd.h> #ifndef GETTID pid_t gettid(void) {return syscall(__NR_gettid);} #endif #ifndef TKILL int tkill(pid_t tid, int sig) {return syscall (__NR_tkill,tid,sig); } #endif void sigusr2(int sig, siginfo_t *sp, void *uc) { } void sigcatch() { struct sigaction sa; sigemptyset(&sa.sa_mask); sa.sa_flags = 0 ; //SA_SIGINFO; sa.sa_sigaction = sigusr2; if (sigaction(SIGUSR2, &sa, NULL)==-1) { perror("sigaction() - SIGUSR2"); exit(1); } if (sigaction(SIGRTMIN, &sa, NULL)==-1) { perror("sigaction() - SIGRTMIN"); exit(1); } if (sigaction(SIGRTMAX, &sa, NULL)==-1) { perror("sigaction() - SIGRTMAX"); exit(1); } } void sig_block() { sigset_t set; sigemptyset(&set); sigaddset(&set, SIGUSR2); sigaddset(&set, SIGRTMIN); sigaddset(&set, SIGRTMAX); if (sigprocmask(SIG_SETMASK, &set,NULL) == -1) { perror("sigprocmask()"); exit(1); } } void sig_send() { if(tkill(gettid(), SIGUSR2)==-1){ perror("tkill()"); exit(1); } if(tkill(gettid(), SIGRTMIN)==-1){ perror("tkill()"); exit(1); } if(kill(getpid(), SIGUSR2)==-1){ perror("tkill()"); exit(1); } if(kill(getpid(), SIGRTMAX)==-1){ perror("tkill()"); exit(1); } if(kill(getpid(), SIGRTMAX)==-1){ perror("tkill()"); exit(1); } } main(int argc) { sigcatch(); sig_block(); sig_send(); pause(); }