another UI attempt, I guess.

sorry.

src/libui_sdl/libui/examples/cpp-multithread/main.cpp

@@ -0,0 +1,92 @@
+// 6 december 2015
+#include <thread>
+#include <chrono>
+#include <mutex>
+#include <condition_variable>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include "../../ui.h"
+using namespace std;
+
+uiMultilineEntry *e;
+condition_variable cv;
+mutex m;
+unique_lock<mutex> ourlock(m);
+thread *timeThread;
+
+void sayTime(void *data)
+{
+	char *s = (char *) data;
+
+	uiMultilineEntryAppend(e, s);
+	delete s;
+}
+
+void threadproc(void)
+{
+	ourlock.lock();
+	while (cv.wait_for(ourlock, chrono::seconds(1)) == cv_status::timeout) {
+		time_t t;
+		char *base;
+		char *s;
+
+		t = time(NULL);
+		base = ctime(&t);
+		s = new char[strlen(base) + 1];
+		strcpy(s, base);
+		uiQueueMain(sayTime, s);
+	}
+}
+
+int onClosing(uiWindow *w, void *data)
+{
+	cv.notify_all();
+	// C++ throws a hissy fit if you don't do this
+	// we might as well, to ensure no uiQueueMain() gets in after uiQuit()
+	timeThread->join();
+	uiQuit();
+	return 1;
+}
+
+void saySomething(uiButton *b, void *data)
+{
+	uiMultilineEntryAppend(e, "Saying something\n");
+}
+
+int main(void)
+{
+	uiInitOptions o;
+	uiWindow *w;
+	uiBox *b;
+	uiButton *btn;
+
+	memset(&o, 0, sizeof (uiInitOptions));
+	if (uiInit(&o) != NULL)
+		abort();
+
+	w = uiNewWindow("Hello", 320, 240, 0);
+	uiWindowSetMargined(w, 1);
+
+	b = uiNewVerticalBox();
+	uiBoxSetPadded(b, 1);
+	uiWindowSetChild(w, uiControl(b));
+
+	e = uiNewMultilineEntry();
+	uiMultilineEntrySetReadOnly(e, 1);
+
+	btn = uiNewButton("Say Something");
+	uiButtonOnClicked(btn, saySomething, NULL);
+	uiBoxAppend(b, uiControl(btn), 0);
+
+	uiBoxAppend(b, uiControl(e), 1);
+
+	// timeThread needs to lock ourlock itself - see http://stackoverflow.com/a/34121629/3408572
+	ourlock.unlock();
+	timeThread = new thread(threadproc);
+
+	uiWindowOnClosing(w, onClosing, NULL);
+	uiControlShow(uiControl(w));
+	uiMain();
+	return 0;
+}