source: benchmark/interrupt_linux.c@ 1e6ffb44

#include <pthread.h>
#include <stdlib.h>
#include <signal.h>

#define __CFA_SIGCXT__ ucontext_t *
#define __CFA_SIGPARMS__ __attribute__((unused)) int sig, __attribute__((unused)) siginfo_t *sfp, __attribute__((unused)) __CFA_SIGCXT__ cxt

void sigHandler( __CFA_SIGPARMS__ ) {
        sigset_t mask;
        sigemptyset( &mask );
        sigaddset( &mask, SIGUSR1 );

        if ( sigprocmask( SIG_UNBLOCK, &mask, NULL ) == -1 ) {
                abort();
        } // if
}

int main() {

        struct sigaction act;

        act.sa_sigaction = (void (*)(int, siginfo_t *, void *))sigHandler;
        sigemptyset( &act.sa_mask );
        sigaddset( &act.sa_mask, SIGUSR1 );

        act.sa_flags = SA_SIGINFO;

        if ( sigaction( SIGUSR1, &act, NULL ) == -1 ) {
                abort();
        } // if

        for( int i = 0; i < 50000000ul; i++ ) {
                pthread_kill( pthread_self(), SIGUSR1 );
        }
}