built and tested - pass

impl/getcurrentthreadid.cpp

@@ -0,0 +1,9 @@
+#include "getcurrentthreadid.h"
+#include <unistd.h>
+#include <pthread.h>
+
+HANDLE GetCurrentThreadId()
+{
+	pid_t tid = pthread_self();
+	return reinterpret_cast<HANDLE>(tid);
+}

impl/getcurrentthreadid.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include "pal.h"
+
+PAL_BEGIN_EXTERNC
+
+HANDLE GetCurrentThreadId();
+
+PAL_END_EXTERNC
+

tests/test-getcurrentthreadid.cpp

@@ -0,0 +1,16 @@
+#include <gtest/gtest.h>
+#include "getcurrentthreadid.h"
+#include <pthread.h>
+
+TEST(GetCurrentThreadId,simple)
+{
+	const HANDLE currentThreadId = GetCurrentThreadId();
+	const pid_t tid = pthread_self();
+
+	// first make sure that on this platform those types are of the same size
+	ASSERT_TRUE(sizeof(HANDLE) >= sizeof(pid_t));
+	
+	// now compare the actual values
+	ASSERT_EQ(currentThreadId,reinterpret_cast<HANDLE>(tid));
+}
+