[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/include/platform_api_extension.h

@@ -226,6 +226,17 @@ os_socket_create(bh_socket_t *sock, int tcp_or_udp);
 int
 os_socket_bind(bh_socket_t socket, const char *addr, int *port);
 
+/**
+ * Set timeout for the given socket
+ *
+ * @param socket the socket to set timeout
+ * @param timeout_us timeout in microseconds
+ *
+ * @return 0 if success, -1 otherwise
+ */
+int
+os_socket_settimeout(bh_socket_t socket, uint64 timeout_us);
+
 /**
  * Make the socket as a passive socket to accept incoming connection requests
  *