diff --git a/.gitignore b/.gitignore
index ef649e1..24cf74c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,4 +51,5 @@ Module.symvers
 Mkfile.old
 dkms.conf
 
-cmake*/
\ No newline at end of file
+cmake*/
+.vscode/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6ab3a98..fee9ddf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,11 +20,15 @@ set(original_run_e2e_tests ${run_e2e_tests})
 set(original_run_unittests ${run_unittests})
 set(original_run_int_tests ${run_int_tests})
 set(original_run_traceability ${run_traceability})
+set(original_run_perf_tests ${run_perf_tests})
+
 
 set(run_e2e_tests OFF)
 set(run_unittests OFF)
 set(run_int_tests OFF)
 set(run_traceability OFF)
+set(run_perf_tests OFF)
+
 
 if ((NOT TARGET azure_c_build_tools) AND (EXISTS ${CMAKE_CURRENT_LIST_DIR}/deps/azure-c-build-tools/CMakeLists.txt))
         add_subdirectory(deps/azure-c-build-tools)
@@ -63,6 +67,7 @@ set(run_e2e_tests ${original_run_e2e_tests})
 set(run_unittests ${original_run_unittests})
 set(run_int_tests ${original_run_int_tests})
 set(run_traceability ${original_run_traceability})
+set(run_perf_tests ${original_run_perf_tests})
 
 add_subdirectory(interfaces)
 add_subdirectory(common)
@@ -93,5 +98,12 @@ if((WIN32) AND (${run_traceability}))
     add_dependencies(azure_c_pal_traceability traceabilitytool)
 endif()
 
+add_library(azure_c_pal_reals INTERFACE)
+if(MSVC)
+    target_link_libraries(azure_c_pal_reals INTERFACE reals_win32)
+else()
+    target_link_libraries(azure_c_pal_reals INTERFACE reals_linux)
+endif()
+
 include(CMakePackageConfigHelpers)
 
diff --git a/interfaces/CMakeLists.txt b/interfaces/CMakeLists.txt
index 2967e7b..bf8f582 100644
--- a/interfaces/CMakeLists.txt
+++ b/interfaces/CMakeLists.txt
@@ -25,6 +25,5 @@ include_directories(${CMAKE_CURRENT_LIST_DIR}/inc)
 include_directories(${MACRO_UTILS_INC_FOLDER})
 
 add_library(pal_interfaces INTERFACE)
-#target_sources(pal_interfaces INTERFACE ${pal_interfaces_md_files} ${pal_interfaces_h_files})
 target_include_directories(pal_interfaces INTERFACE ${CMAKE_CURRENT_LIST_DIR}/inc)
 add_subdirectory(tests)
diff --git a/interfaces/tests/CMakeLists.txt b/interfaces/tests/CMakeLists.txt
index cfb4394..17a530c 100644
--- a/interfaces/tests/CMakeLists.txt
+++ b/interfaces/tests/CMakeLists.txt
@@ -1,5 +1,7 @@
 #Copyright (C) Microsoft Corporation. All rights reserved.
 
+add_subdirectory(reals)
+
 if(${run_ut_tests})
     add_subdirectory(lock_ut)
 endif()
diff --git a/interfaces/tests/reals/CMakeLists.txt b/interfaces/tests/reals/CMakeLists.txt
new file mode 100644
index 0000000..5c68fd0
--- /dev/null
+++ b/interfaces/tests/reals/CMakeLists.txt
@@ -0,0 +1,27 @@
+#Copyright (c) Microsoft. All rights reserved.
+#Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+cmake_minimum_required(VERSION 2.8.11)
+
+set(reals_pal_interface_h_files
+    real_threadapi.h
+    real_threadapi_renames.h
+)
+
+if(WIN32)
+set(reals_pal_interface_h_files ${reals_pal_interface_h_files}
+    real_interlocked_hl.h
+    real_interlocked_hl_renames.h
+    real_srw_lock.h
+    real_srw_lock_renames.h
+    real_string_utils.h
+    real_string_utils_renames.h
+    real_timer.h
+    real_timer_renames.h
+)
+else()
+endif()
+
+add_library(reals_pal_interface INTERFACE)
+target_include_directories(reals_pal_interface INTERFACE ${CMAKE_CURRENT_LIST_DIR})
+target_link_libraries(reals_pal_interface INTERFACE azure_c_logging pal_common)
diff --git a/interfaces/tests/reals/real_interlocked_hl.h b/interfaces/tests/reals/real_interlocked_hl.h
new file mode 100644
index 0000000..36ce567
--- /dev/null
+++ b/interfaces/tests/reals/real_interlocked_hl.h
@@ -0,0 +1,39 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#ifndef REAL_INTERLOCKED_HL_H
+#define REAL_INTERLOCKED_HL_H
+
+#include "azure_macro_utils/macro_utils.h"
+
+#include "windows.h"
+
+#define R2(X) REGISTER_GLOBAL_MOCK_HOOK(X, real_##X);
+
+#define REGISTER_INTERLOCKED_HL_GLOBAL_MOCK_HOOK()                    \
+    MU_FOR_EACH_1(R2,                      \
+        InterlockedHL_Add64WithCeiling, \
+        InterlockedHL_WaitForValue, \
+        InterlockedHL_WaitForNotValue, \
+        InterlockedHL_SetAndWake, \
+        InterlockedHL_CompareExchange64If \
+    )
+
+#include "interlocked_hl.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    INTERLOCKED_HL_RESULT real_InterlockedHL_Add64WithCeiling(LONGLONG volatile * Addend, LONGLONG Ceiling, LONGLONG Value, LONGLONG* originalAddend);
+    INTERLOCKED_HL_RESULT real_InterlockedHL_WaitForValue(LONG volatile* address, LONG value, DWORD milliseconds);
+    INTERLOCKED_HL_RESULT real_InterlockedHL_WaitForValue64(LONG64 volatile* address, LONG64 value, DWORD milliseconds);
+    INTERLOCKED_HL_RESULT real_InterlockedHL_WaitForNotValue(LONG volatile* address, LONG value, DWORD milliseconds);
+    INTERLOCKED_HL_RESULT real_InterlockedHL_SetAndWake(LONG volatile* address, LONG value);
+    INTERLOCKED_HL_RESULT real_InterlockedHL_CompareExchange64If(LONG64 volatile* target, LONG64 exchange, INTERLOCKED_COMPARE_EXCHANGE_64_IF compare, LONG64* original_target);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //REAL_INTERLOCKED_HL_H
diff --git a/interfaces/tests/reals/real_interlocked_hl_renames.h b/interfaces/tests/reals/real_interlocked_hl_renames.h
new file mode 100644
index 0000000..3083b6a
--- /dev/null
+++ b/interfaces/tests/reals/real_interlocked_hl_renames.h
@@ -0,0 +1,11 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define InterlockedHL_Add64WithCeiling real_InterlockedHL_Add64WithCeiling
+#define InterlockedHL_WaitForValue real_InterlockedHL_WaitForValue
+#define InterlockedHL_WaitForValue64 real_InterlockedHL_WaitForValue64
+#define InterlockedHL_WaitForNotValue real_InterlockedHL_WaitForNotValue
+#define InterlockedHL_SetAndWake real_InterlockedHL_SetAndWake
+#define InterlockedHL_CompareExchange64If real_InterlockedHL_CompareExchange64If
+
+#define INTERLOCKED_HL_RESULT real_INTERLOCKED_HL_RESULT
diff --git a/interfaces/tests/reals/real_srw_lock.h b/interfaces/tests/reals/real_srw_lock.h
new file mode 100644
index 0000000..b1cf08b
--- /dev/null
+++ b/interfaces/tests/reals/real_srw_lock.h
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#ifndef REAL_SRW_LOCK_H
+#define REAL_SRW_LOCK_H
+
+#ifdef __cplusplus
+#include <cstdbool>
+#else
+#include <stdbool.h>
+#endif
+
+#include "azure_macro_utils/macro_utils.h"
+
+#include "srw_lock.h"
+
+#define R2(X) REGISTER_GLOBAL_MOCK_HOOK(X, real_##X);
+
+#define REGISTER_SRW_LOCK_GLOBAL_MOCK_HOOK() \
+    MU_FOR_EACH_1(R2, \
+        srw_lock_create, \
+        srw_lock_destroy, \
+        srw_lock_acquire_exclusive, \
+        srw_lock_release_exclusive, \
+        srw_lock_acquire_shared, \
+        srw_lock_release_shared \
+)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+SRW_LOCK_HANDLE real_srw_lock_create(bool do_statistics, const char* lock_name);
+
+void real_srw_lock_destroy(SRW_LOCK_HANDLE handle);
+
+void real_srw_lock_acquire_exclusive(SRW_LOCK_HANDLE handle);
+
+void real_srw_lock_release_exclusive(SRW_LOCK_HANDLE handle);
+
+void real_srw_lock_acquire_shared(SRW_LOCK_HANDLE handle);
+
+void real_srw_lock_release_shared(SRW_LOCK_HANDLE handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // REAL_SRW_LOCK_H
diff --git a/interfaces/tests/reals/real_srw_lock_renames.h b/interfaces/tests/reals/real_srw_lock_renames.h
new file mode 100644
index 0000000..bed455f
--- /dev/null
+++ b/interfaces/tests/reals/real_srw_lock_renames.h
@@ -0,0 +1,9 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define srw_lock_create real_srw_lock_create
+#define srw_lock_destroy real_srw_lock_destroy
+#define srw_lock_acquire_exclusive real_srw_lock_acquire_exclusive
+#define srw_lock_release_exclusive real_srw_lock_release_exclusive
+#define srw_lock_acquire_shared real_srw_lock_acquire_shared
+#define srw_lock_release_shared real_srw_lock_release_shared
diff --git a/interfaces/tests/reals/real_string_utils.h b/interfaces/tests/reals/real_string_utils.h
new file mode 100644
index 0000000..a5da99d
--- /dev/null
+++ b/interfaces/tests/reals/real_string_utils.h
@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#ifndef REAL_STRING_UTILS_H
+#define REAL_STRING_UTILS_H
+
+#ifdef __cplusplus
+#include <cstdbool>
+#else
+#include <stdbool.h>
+#endif
+
+#include "azure_macro_utils/macro_utils.h"
+
+#include "srw_lock.h"
+
+#define R2(X) REGISTER_GLOBAL_MOCK_HOOK(X, real_##X);
+
+#define REGISTER_STRING_UTILS_GLOBAL_MOCK_HOOK() \
+    MU_FOR_EACH_1(R2, \
+        sprintf_char_function, \
+        sprintf_wchar_function, \
+        vsprintf_char, \
+        vsprintf_wchar, \
+        FILETIME_toAsciiArray, \
+        mbs_to_wcs, \
+        wcs_to_mbs \
+)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "windows.h"
+
+char* real_sprintf_char_function(const char* format, ...);
+
+wchar_t* real_sprintf_wchar_function(const wchar_t* format, ...);
+
+char* real_vsprintf_char(const char* format, va_list va);
+
+wchar_t* real_vsprintf_wchar(const wchar_t* format, va_list va);
+
+char* real_FILETIME_toAsciiArray(const FILETIME* fileTime);
+
+wchar_t* real_mbs_to_wcs(const char* source);
+
+char* real_wcs_to_mbs(const wchar_t* source);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // REAL_STRING_UTILS_H
diff --git a/interfaces/tests/reals/real_string_utils_renames.h b/interfaces/tests/reals/real_string_utils_renames.h
new file mode 100644
index 0000000..8e60b28
--- /dev/null
+++ b/interfaces/tests/reals/real_string_utils_renames.h
@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define sprintf_char_function                real_sprintf_char_function
+#define sprintf_wchar_function               real_sprintf_wchar_function
+#define vsprintf_char                        real_vsprintf_char
+#define vsprintf_wchar                       real_vsprintf_wchar
+#define FILETIME_toAsciiArray                real_FILETIME_toAsciiArray
+#define mbs_to_wcs                           real_mbs_to_wcs
+#define wcs_to_mbs                           real_wcs_to_mbs
diff --git a/interfaces/tests/reals/real_threadapi.h b/interfaces/tests/reals/real_threadapi.h
new file mode 100644
index 0000000..fbfd19c
--- /dev/null
+++ b/interfaces/tests/reals/real_threadapi.h
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#ifndef REAL_THREADAPI_H
+#define REAL_THREADAPI_H
+
+#include "azure_macro_utils/macro_utils.h"
+
+#include "threadapi.h"
+
+#define R2(X) REGISTER_GLOBAL_MOCK_HOOK(X, real_##X);
+
+#define REGISTER_THREADAPI_GLOBAL_MOCK_HOOK() \
+    MU_FOR_EACH_1(R2, \
+        ThreadAPI_Create, \
+        ThreadAPI_Join, \
+        ThreadAPI_Exit, \
+        ThreadAPI_Sleep \
+)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+THREADAPI_RESULT real_ThreadAPI_Create(THREAD_HANDLE* threadHandle, THREAD_START_FUNC func, void* arg);
+
+THREADAPI_RESULT real_ThreadAPI_Join(THREAD_HANDLE threadHandle, int* res);
+
+void real_ThreadAPI_Exit(int res);
+
+void real_ThreadAPI_Sleep(unsigned int milliseconds);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // REAL_THREADAPI_H
diff --git a/interfaces/tests/reals/real_threadapi_renames.h b/interfaces/tests/reals/real_threadapi_renames.h
new file mode 100644
index 0000000..9beeed1
--- /dev/null
+++ b/interfaces/tests/reals/real_threadapi_renames.h
@@ -0,0 +1,9 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define ThreadAPI_Create    real_ThreadAPI_Create
+#define ThreadAPI_Join      real_ThreadAPI_Join
+#define ThreadAPI_Exit      real_ThreadAPI_Exit
+#define ThreadAPI_Sleep     real_ThreadAPI_Sleep
+
+#define THREADAPI_RESULT    real_THREADAPI_RESULT
diff --git a/interfaces/tests/reals/real_timer.h b/interfaces/tests/reals/real_timer.h
new file mode 100644
index 0000000..948e21c
--- /dev/null
+++ b/interfaces/tests/reals/real_timer.h
@@ -0,0 +1,45 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#ifndef REAL_TIMER_H
+#define REAL_TIMER_H
+
+#include "azure_macro_utils/macro_utils.h"
+
+#include "timer.h"
+
+#define R2(X) REGISTER_GLOBAL_MOCK_HOOK(X, real_##X);
+
+#define REGISTER_TIMER_GLOBAL_MOCK_HOOK() \
+    MU_FOR_EACH_1(R2, \
+        timer_create, \
+        timer_start, \
+        timer_get_elapsed, \
+        timer_global_get_elapsed_ms, \
+        timer_destroy \
+)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+TIMER_HANDLE real_timer_create(void);
+
+void real_timer_start(TIMER_HANDLE handle);
+
+double real_timer_get_elapsed(TIMER_HANDLE handle);
+
+double real_timer_get_elapsed_ms(TIMER_HANDLE handle);
+
+double real_timer_global_get_elapsed_ms(void);
+
+double real_timer_global_get_elapsed_us(void);
+
+void real_timer_destroy(TIMER_HANDLE handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // REAL_TIMER_H
diff --git a/interfaces/tests/reals/real_timer_renames.h b/interfaces/tests/reals/real_timer_renames.h
new file mode 100644
index 0000000..f56a839
--- /dev/null
+++ b/interfaces/tests/reals/real_timer_renames.h
@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define timer_create                    real_timer_create
+#define timer_start                     real_timer_start
+#define timer_get_elapsed               real_timer_get_elapsed
+#define timer_get_elapsed_ms            real_timer_get_elapsed_ms
+#define timer_destroy                   real_timer_destroy
+#define timer_global_get_elapsed_ms     real_timer_global_get_elapsed_ms
+#define timer_global_get_elapsed_us     real_timer_global_get_elapsed_us
diff --git a/linux/CMakeLists.txt b/linux/CMakeLists.txt
index 28ae860..ef51095 100644
--- a/linux/CMakeLists.txt
+++ b/linux/CMakeLists.txt
@@ -18,7 +18,7 @@ SOURCE_GROUP(devdoc FILES ${pal_linux_md_files})
 include_directories(${CMAKE_CURRENT_LIST_DIR}/inc)
 
 add_library(pal_linux ${pal_linux_h_files} ${pal_linux_c_files} ${pal_linux_md_files})
-target_link_libraries(pal_linux pal_interfaces)
+target_link_libraries(pal_linux pal_interfaces pthread m rt uuid)
 target_include_directories(pal_linux PUBLIC ${CMAKE_CURRENT_LIST_DIR}/inc)
 
 add_subdirectory(tests)
diff --git a/linux/tests/CMakeLists.txt b/linux/tests/CMakeLists.txt
index 843a064..a8477ce 100644
--- a/linux/tests/CMakeLists.txt
+++ b/linux/tests/CMakeLists.txt
@@ -1,9 +1,11 @@
 #Copyright (C) Microsoft Corporation. All rights reserved.
 
+add_subdirectory(reals_linux)
 # unit tests
 if(${run_unittests})
     add_subdirectory(interlocked_linux_ut)
     add_subdirectory(uniqueid_ut)
+    add_subdirectory(reals_linux_ut)
 endif()
 
 if(${run_int_tests})
diff --git a/linux/tests/reals_linux/CMakeLists.txt b/linux/tests/reals_linux/CMakeLists.txt
new file mode 100644
index 0000000..d884f0e
--- /dev/null
+++ b/linux/tests/reals_linux/CMakeLists.txt
@@ -0,0 +1,12 @@
+#Copyright (c) Microsoft. All rights reserved.
+#Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+cmake_minimum_required(VERSION 2.8.11)
+
+set(reals_linux_c_files
+    real_threadapi_linux.c
+)
+
+include_directories(${CMAKE_CURRENT_LIST_DIR}/../../src)
+add_library(reals_linux ${reals_linux_c_files})
+target_link_libraries(reals_linux reals_pal_interface)
diff --git a/linux/tests/reals_linux/real_threadapi_linux.c b/linux/tests/reals_linux/real_threadapi_linux.c
new file mode 100644
index 0000000..28b4dd0
--- /dev/null
+++ b/linux/tests/reals_linux/real_threadapi_linux.c
@@ -0,0 +1,9 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define GBALLOC_H
+
+#include "real_threadapi_renames.h"
+
+#include "threadapi_pthreads.c"
+
diff --git a/linux/tests/reals_linux_ut/CMakeLists.txt b/linux/tests/reals_linux_ut/CMakeLists.txt
new file mode 100644
index 0000000..72431a4
--- /dev/null
+++ b/linux/tests/reals_linux_ut/CMakeLists.txt
@@ -0,0 +1,10 @@
+#Copyright (c) Microsoft. All rights reserved.
+#Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+set(theseTestsName reals_linux_ut)
+
+set(${theseTestsName}_test_files
+    ${theseTestsName}.c
+)
+
+build_c_tests(${theseTestsName} ON "tests/azure_c_pal/linux" ADDITIONAL_LIBS pal_linux reals_linux)
diff --git a/linux/tests/reals_linux_ut/main.c b/linux/tests/reals_linux_ut/main.c
new file mode 100644
index 0000000..70fff65
--- /dev/null
+++ b/linux/tests/reals_linux_ut/main.c
@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#include <stddef.h>
+#include "testrunnerswitcher.h"
+
+int main(void)
+{
+    size_t failedTestCount = 0;
+    RUN_TEST_SUITE(reals_linux_ut, failedTestCount);
+    return failedTestCount;
+}
diff --git a/linux/tests/reals_linux_ut/reals_linux_ut.c b/linux/tests/reals_linux_ut/reals_linux_ut.c
new file mode 100644
index 0000000..963e6bb
--- /dev/null
+++ b/linux/tests/reals_linux_ut/reals_linux_ut.c
@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#include "testrunnerswitcher.h"
+
+#define REGISTER_GLOBAL_MOCK_HOOK(original, real) \
+    (original == real) ? (void)0 : (void)1;
+
+#include "threadapi.h"
+
+#include "real_threadapi.h"
+
+BEGIN_TEST_SUITE(reals_linux_ut)
+
+// this test makes sure that the mappings work
+// (there is a real_ function corresponding to the original)
+TEST_FUNCTION(check_all_c_pal_reals)
+{
+    // arrange
+
+    // act
+    REGISTER_THREADAPI_GLOBAL_MOCK_HOOK();
+
+    // assert
+    // no explicit assert, if it builds it works
+}
+
+END_TEST_SUITE(reals_linux_ut)
diff --git a/win32/CMakeLists.txt b/win32/CMakeLists.txt
index dffaf41..c9bad0f 100644
--- a/win32/CMakeLists.txt
+++ b/win32/CMakeLists.txt
@@ -26,7 +26,7 @@ SOURCE_GROUP(devdoc FILES ${pal_win32_md_files})
 include_directories(${CMAKE_CURRENT_LIST_DIR}/inc)
 
 add_library(pal_win32 ${pal_win32_h_files} ${pal_win32_c_files} ${pal_win32_md_files})
-target_link_libraries(pal_win32 pal_interfaces pal_common ws2_32 synchronization)
+target_link_libraries(pal_win32 pal_interfaces pal_common ws2_32 synchronization rpcrt4 azure_c_logging)
 target_include_directories(pal_win32 PUBLIC ${CMAKE_CURRENT_LIST_DIR}/inc)
 
 add_subdirectory(tests)
diff --git a/win32/src/string_utils.c b/win32/src/string_utils.c
index ca5d6a7..4487c72 100644
--- a/win32/src/string_utils.c
+++ b/win32/src/string_utils.c
@@ -8,9 +8,9 @@
 #include "windows.h"
 
 #include "azure_macro_utils/macro_utils.h"
-#include "gballoc.h"
 #include "azure_c_logging/xlogging.h"
 
+#include "gballoc.h"
 #include "string_utils.h"
 
 IMPLEMENT_MOCKABLE_FUNCTION(, char*, vsprintf_char, const char*, format, va_list, va)
diff --git a/win32/tests/CMakeLists.txt b/win32/tests/CMakeLists.txt
index 38489ad..2e88a6b 100644
--- a/win32/tests/CMakeLists.txt
+++ b/win32/tests/CMakeLists.txt
@@ -1,5 +1,6 @@
 #Copyright (C) Microsoft Corporation. All rights reserved.
 
+add_subdirectory(reals_win32)
 # unit tests
 if(${run_unittests})
     add_subdirectory(execution_engine_win32_ut)
@@ -12,6 +13,7 @@ if(${run_unittests})
     add_subdirectory(uniqueid_win32_ut)
     add_subdirectory(timer_win32_ut)
     add_subdirectory(srw_lock_win32_ut)
+    add_subdirectory(reals_win32_ut)
 endif()
 
 if(${run_int_tests})
diff --git a/win32/tests/reals_win32/CMakeLists.txt b/win32/tests/reals_win32/CMakeLists.txt
new file mode 100644
index 0000000..76aa96a
--- /dev/null
+++ b/win32/tests/reals_win32/CMakeLists.txt
@@ -0,0 +1,17 @@
+#Copyright (c) Microsoft. All rights reserved.
+#Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+cmake_minimum_required(VERSION 2.8.11)
+
+
+set(reals_win32_c_files
+    real_threadapi.c
+    real_interlocked_hl_win32.c
+    real_srw_lock_win32.c
+    real_string_utils_win32.c
+    real_timer_win32.c
+)
+
+include_directories(${CMAKE_CURRENT_LIST_DIR}/../../src)
+add_library(reals_win32 ${reals_win32_c_files})
+target_link_libraries(reals_win32 reals_pal_interface)
diff --git a/win32/tests/reals_win32/real_interlocked_hl_win32.c b/win32/tests/reals_win32/real_interlocked_hl_win32.c
new file mode 100644
index 0000000..278646d
--- /dev/null
+++ b/win32/tests/reals_win32/real_interlocked_hl_win32.c
@@ -0,0 +1,7 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+#define GBALLOC_H
+
+#include "real_interlocked_hl_renames.h"
+
+#include "interlocked_hl_win32.c"
diff --git a/win32/tests/reals_win32/real_srw_lock_win32.c b/win32/tests/reals_win32/real_srw_lock_win32.c
new file mode 100644
index 0000000..81d3355
--- /dev/null
+++ b/win32/tests/reals_win32/real_srw_lock_win32.c
@@ -0,0 +1,11 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define GBALLOC_H
+
+#include "real_string_utils_renames.h"
+#include "real_timer_renames.h"
+
+#include "real_srw_lock_renames.h"
+
+#include "srw_lock_win32.c"
diff --git a/win32/tests/reals_win32/real_string_utils_win32.c b/win32/tests/reals_win32/real_string_utils_win32.c
new file mode 100644
index 0000000..b905f6c
--- /dev/null
+++ b/win32/tests/reals_win32/real_string_utils_win32.c
@@ -0,0 +1,8 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define GBALLOC_H
+
+#include "real_string_utils_renames.h"
+
+#include "string_utils.c"
diff --git a/win32/tests/reals_win32/real_threadapi.c b/win32/tests/reals_win32/real_threadapi.c
new file mode 100644
index 0000000..9129d16
--- /dev/null
+++ b/win32/tests/reals_win32/real_threadapi.c
@@ -0,0 +1,9 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define GBALLOC_H
+
+#include "real_threadapi_renames.h"
+
+#include "threadapi_win32.c"
+
diff --git a/win32/tests/reals_win32/real_timer_win32.c b/win32/tests/reals_win32/real_timer_win32.c
new file mode 100644
index 0000000..5ec1052
--- /dev/null
+++ b/win32/tests/reals_win32/real_timer_win32.c
@@ -0,0 +1,8 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#define GBALLOC_H
+
+#include "real_timer_renames.h"
+
+#include "timer.c"
diff --git a/win32/tests/reals_win32_ut/CMakeLists.txt b/win32/tests/reals_win32_ut/CMakeLists.txt
new file mode 100644
index 0000000..d376865
--- /dev/null
+++ b/win32/tests/reals_win32_ut/CMakeLists.txt
@@ -0,0 +1,10 @@
+#Copyright (c) Microsoft. All rights reserved.
+#Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+set(theseTestsName reals_win32_ut)
+
+set(${theseTestsName}_test_files
+    ${theseTestsName}.c
+)
+
+build_c_tests(${theseTestsName} ON "tests/azure_c_pal/win32" ADDITIONAL_LIBS pal_win32 reals_win32)
diff --git a/win32/tests/reals_win32_ut/main.c b/win32/tests/reals_win32_ut/main.c
new file mode 100644
index 0000000..d71364f
--- /dev/null
+++ b/win32/tests/reals_win32_ut/main.c
@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#include <stddef.h>
+#include "testrunnerswitcher.h"
+
+int main(void)
+{
+    size_t failedTestCount = 0;
+    RUN_TEST_SUITE(reals_win32_ut, failedTestCount);
+    return failedTestCount;
+}
diff --git a/win32/tests/reals_win32_ut/reals_win32_ut.c b/win32/tests/reals_win32_ut/reals_win32_ut.c
new file mode 100644
index 0000000..8a47890
--- /dev/null
+++ b/win32/tests/reals_win32_ut/reals_win32_ut.c
@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#include "testrunnerswitcher.h"
+
+#define REGISTER_GLOBAL_MOCK_HOOK(original, real) \
+    (original == real) ? (void)0 : (void)1;
+
+#include "threadapi.h"
+#include "srw_lock.h"
+#include "string_utils.h"
+#include "timer.h"
+#include "interlocked_hl.h"
+
+#include "real_threadapi.h"
+#include "real_srw_lock.h"
+#include "real_string_utils.h"
+#include "real_timer.h"
+#include "real_interlocked_hl.h"
+
+BEGIN_TEST_SUITE(reals_win32_ut)
+
+// this test makes sure that the mappings work
+// (there is a real_ function corresponding to the original)
+TEST_FUNCTION(check_all_c_pal_reals)
+{
+    // arrange
+
+    // act
+    REGISTER_THREADAPI_GLOBAL_MOCK_HOOK();
+    REGISTER_SRW_LOCK_GLOBAL_MOCK_HOOK();
+    REGISTER_STRING_UTILS_GLOBAL_MOCK_HOOK();
+    REGISTER_TIMER_GLOBAL_MOCK_HOOK();
+    REGISTER_INTERLOCKED_HL_GLOBAL_MOCK_HOOK();
+
+    // assert
+    // no explicit assert, if it builds it works
+}
+
+END_TEST_SUITE(reals_win32_ut)