[debugger enhance] don't block gdbserver thread while executing (#989)

Allow to set break point again when all break points are removed and
wasm app starts running.

core/shared/platform/common/posix/posix_socket.c

@@ -71,6 +71,22 @@ fail:
     return BHT_ERROR;
 }
 
+int
+os_socket_settimeout(bh_socket_t socket, uint64 timeout_us)
+{
+    struct timeval tv;
+    tv.tv_sec = timeout_us / 1000000UL;
+    tv.tv_usec = timeout_us % 1000000UL;
+
+    if (setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (const char *)&tv,
+                   sizeof(tv))
+        != 0) {
+        return BHT_ERROR;
+    }
+
+    return BHT_OK;
+}
+
 int
 os_socket_listen(bh_socket_t socket, int max_client)
 {