runtime: Block signals when creating a new thread.

From-SVN: r195619

diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index 6d90076..b59f4ac 100644 (file)
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 #include <limits.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
 #include <unistd.h>
@@ -1217,6 +1218,9 @@ runtime_newm(void)
        pthread_attr_t attr;
        pthread_t tid;
        size_t stacksize;
+       sigset_t clear;
+       sigset_t old;
+       int ret;
 
 #if 0
        static const Type *mtype;  // The Go type M
@@ -1249,7 +1253,15 @@ runtime_newm(void)
        if(pthread_attr_setstacksize(&attr, stacksize) != 0)
                runtime_throw("pthread_attr_setstacksize");
 
-       if(pthread_create(&tid, &attr, runtime_mstart, mp) != 0)
+       // Block signals during pthread_create so that the new thread
+       // starts with signals disabled.  It will enable them in minit.
+       sigfillset(&clear);
+       sigemptyset(&old);
+       sigprocmask(SIG_BLOCK, &clear, &old);
+       ret = pthread_create(&tid, &attr, runtime_mstart, mp);
+       sigprocmask(SIG_SETMASK, &old, nil);
+
+       if (ret != 0)
                runtime_throw("pthread_create");
 
        return mp;