Prewarm wasm workers before accepting requests

src/linux_fastcgi.cpp

@@ -1388,6 +1388,15 @@ void listen_for_connections()
 	server.on_data = &handle_data;
 	server.on_complete = &handle_complete;
 	server.on_cli_complete = &handle_cli_complete;
+	Request startup_context;
+	startup_context.server = &server_state;
+	f64 wasm_start = time_precise();
+	String wasm_error = wasm_backend_start(startup_context);
+	f64 wasm_ms = (time_precise() - wasm_start) * 1000.0;
+	if(wasm_error == "")
+		printf("(P) wasm worker ready: PID %i in %.3f ms\n", getpid(), wasm_ms);
+	else
+		fprintf(stderr, "(!) wasm worker initialization failed: PID %i in %.3f ms: %s\n", getpid(), wasm_ms, wasm_error.c_str());
 	for(;;)
 	{
 		server.process(-1);