How to use SIGRTMIN in x86 or armeabi-v7a abi in Android NDK?

问题

I am trying to use SIGRTMIN signal to create blocking signalhandler in Android NDK.

int startThread(){
   pthread_t thread;
   sigset_t set;

       /* Block SIGRTMIN other threads created by main()
          will inherit a copy of the signal mask. */

   sigemptyset(&set);
   int rc = sigaddset(&set, SIGRTMIN);
   __android_log_print(ANDROID_LOG_DEBUG, "LOG", "Return Code:%d",rc);
   __android_log_print(ANDROID_LOG_DEBUG, "LOG", "Error Code:%d",errno);
   pthread_sigmask(SIG_BLOCK, &set, NULL);
   pthread_create(&thread, NULL, &sig_thread, (void *) &set);
}

static void *sig_thread(void *arg)
{
   sigset_t *set = arg;
   int s, sig;
   for (;;) {
       s = sigwait(set, &sig);

       __android_log_print(ANDROID_LOG_DEBUG, "LOG", "Signal handling thread got signal %d\n", sig);
   }
}

I am getting Return Code as -1 and Error code as 22 (EINVAL - Invalid Argument) while adding signal set sigaddset(&set, SIGRTMIN)

This is happening in x86 or armeabi-v7a abi. If i use x86_64 then it works.

is there any way to solve this problem or any alternative in x86/armeabi-v7a abi in Android?

来源：https://stackoverflow.com/questions/53481948/how-to-use-sigrtmin-in-x86-or-armeabi-v7a-abi-in-android-ndk