diff --git a/ptypes-semaphore/build.bat b/ptypes-semaphore/build.bat
new file mode 100644
index 0000000..0692827
--- /dev/null
+++ b/ptypes-semaphore/build.bat
@@ -0,0 +1,4 @@
+@echo off
+call ../vcppbuild.bat semaphore "/link user32.lib ../ext/libs/ptypes.lib"
+semaphore.exe
+pause
\ No newline at end of file
diff --git a/ptypes-semaphore/build.sh b/ptypes-semaphore/build.sh
new file mode 100644
index 0000000..6ab5720
--- /dev/null
+++ b/ptypes-semaphore/build.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+gcc -o main -lptypes semaphore.cpp
+./main
\ No newline at end of file
diff --git a/ptypes-semaphore/semaphore.cpp b/ptypes-semaphore/semaphore.cpp
new file mode 100644
index 0000000..84c8edd
--- /dev/null
+++ b/ptypes-semaphore/semaphore.cpp
@@ -0,0 +1,49 @@
+#include <ptypes/ptypes.h>
+#include <ptypes/pasync.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <windows.h>
+
+USING_PTYPES
+
+#define BUFFER_SIZE 10
+
+volatile int buffer[BUFFER_SIZE];
+semaphore s(0);
+
+DWORD WINAPI produce(void * data)
+{
+		int i;
+	srand ((unsigned int)time(NULL));
+		//while (counter == BUFFER_SIZE - 1);
+		
+		for (i = 0; i < BUFFER_SIZE; i++)
+			buffer[i] = rand() % 20 + 1; // yes I know rand is not thread safe - I just need a way to demonstrate a producing/consuming problem - using the same number doesn't help.
+		s.post();
+	return 0;
+
+}
+
+DWORD WINAPI consume(void * data)
+{
+	s.wait();
+	int i = 0;
+	for(i = 0; i < BUFFER_SIZE; i++)
+	{
+		printf("CONSUMER value = %i\n", buffer[i]);
+		buffer[i] = 0;
+	}
+	return 0;
+}
+
+int main() {
+  int i;
+  HANDLE thread1, thread2;
+  for(i = 0; i < BUFFER_SIZE; i++)
+	buffer[i] = -1;
+  thread1 = CreateThread(NULL, 0, produce, NULL, 0, NULL);
+  thread2 = CreateThread(NULL, 0, consume, NULL, 0, NULL);
+  WaitForSingleObject(thread1, INFINITE);
+  WaitForSingleObject(thread2, INFINITE);
+}
\ No newline at end of file