runtime: Use pthread_sigmask instead of sigprocmask.

From-SVN: r205652

libgo/runtime/go-signal.c

@@ -252,7 +252,7 @@ sig_panic_leadin (int sig)
   /* The signal handler blocked signals; unblock them.  */
   i = sigfillset (&clear);
   __go_assert (i == 0);
-  i = sigprocmask (SIG_UNBLOCK, &clear, NULL);
+  i = pthread_sigmask (SIG_UNBLOCK, &clear, NULL);
   __go_assert (i == 0);
 }
 

libgo/runtime/proc.c

@@ -208,9 +208,9 @@ runtime_newosproc(M *mp)
 #endif
 
 	sigemptyset(&old);
-	sigprocmask(SIG_BLOCK, &clear, &old);
+	pthread_sigmask(SIG_BLOCK, &clear, &old);
 	ret = pthread_create(&tid, &attr, runtime_mstart, mp);
-	sigprocmask(SIG_SETMASK, &old, nil);
+	pthread_sigmask(SIG_SETMASK, &old, nil);
 
 	if (ret != 0)
 		runtime_throw("pthread_create");

libgo/runtime/runtime.c

@@ -256,7 +256,7 @@ runtime_minit(void)
 	runtime_signalstack(m->gsignalstack, m->gsignalstacksize);
 	if (sigemptyset(&sigs) != 0)
 		runtime_throw("sigemptyset");
-	sigprocmask(SIG_SETMASK, &sigs, nil);
+	pthread_sigmask(SIG_SETMASK, &sigs, nil);
 }
 
 // Called from dropm to undo the effect of an minit.