diff --git a/dlls/ntdll/tests/sync.c b/dlls/ntdll/tests/sync.c
index 7e389c9762b..f2499ea648a 100644
--- a/dlls/ntdll/tests/sync.c
+++ b/dlls/ntdll/tests/sync.c
@@ -44,7 +44,12 @@ static NTSTATUS (WINAPI *pNtReleaseSemaphore)( HANDLE, ULONG, ULONG * );
 static NTSTATUS (WINAPI *pNtResetEvent)( HANDLE, LONG * );
 static NTSTATUS (WINAPI *pNtSetEvent)( HANDLE, LONG * );
 static NTSTATUS (WINAPI *pNtWaitForKeyedEvent)( HANDLE, const void *, BOOLEAN, const LARGE_INTEGER * );
+static BOOLEAN  (WINAPI *pRtlAcquireResourceExclusive)( RTL_RWLOCK *, BOOLEAN );
+static BOOLEAN  (WINAPI *pRtlAcquireResourceShared)( RTL_RWLOCK *, BOOLEAN );
+static void     (WINAPI *pRtlDeleteResource)( RTL_RWLOCK * );
+static void     (WINAPI *pRtlInitializeResource)( RTL_RWLOCK * );
 static void     (WINAPI *pRtlInitUnicodeString)( UNICODE_STRING *, const WCHAR * );
+static void     (WINAPI *pRtlReleaseResource)( RTL_RWLOCK * );
 static NTSTATUS (WINAPI *pRtlWaitOnAddress)( const void *, const void *, SIZE_T, const LARGE_INTEGER * );
 static void     (WINAPI *pRtlWakeAddressAll)( const void * );
 static void     (WINAPI *pRtlWakeAddressSingle)( const void * );
@@ -596,6 +601,159 @@ static void test_wait_on_address(void)
     ok(address == 0, "got %s\n", wine_dbgstr_longlong(address));
 }
 
+static HANDLE thread_ready, thread_done;
+
+static DWORD WINAPI resource_shared_thread(void *arg)
+{
+    RTL_RWLOCK *resource = arg;
+    BOOLEAN ret;
+
+    ret = pRtlAcquireResourceShared(resource, TRUE);
+    ok(ret == TRUE, "got %u\n", ret);
+
+    SetEvent(thread_ready);
+    ok(!WaitForSingleObject(thread_done, 1000), "wait failed\n");
+    pRtlReleaseResource(resource);
+    return 0;
+}
+
+static DWORD WINAPI resource_exclusive_thread(void *arg)
+{
+    RTL_RWLOCK *resource = arg;
+    BOOLEAN ret;
+
+    ret = pRtlAcquireResourceExclusive(resource, TRUE);
+    ok(ret == TRUE, "got %u\n", ret);
+
+    SetEvent(thread_ready);
+    ok(!WaitForSingleObject(thread_done, 1000), "wait failed\n");
+    pRtlReleaseResource(resource);
+    return 0;
+}
+
+static void test_resource(void)
+{
+    HANDLE thread, thread2;
+    RTL_RWLOCK resource;
+    BOOLEAN ret;
+
+    pRtlInitializeResource(&resource);
+    thread_ready = CreateEventA(NULL, FALSE, FALSE, NULL);
+    thread_done = CreateEventA(NULL, FALSE, FALSE, NULL);
+
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == FALSE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+    pRtlReleaseResource(&resource);
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+    pRtlReleaseResource(&resource);
+    pRtlReleaseResource(&resource);
+
+    /* Do not acquire the resource ourselves, but spawn a shared thread holding it. */
+
+    thread = CreateThread(NULL, 0, resource_shared_thread, &resource, 0, NULL);
+    ok(!WaitForSingleObject(thread_ready, 1000), "wait failed\n");
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == FALSE, "got %u\n", ret);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    SetEvent(thread_done);
+    ok(!WaitForSingleObject(thread, 1000), "wait failed\n");
+    CloseHandle(thread);
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    /* Acquire the resource as exclusive, and then spawn a shared thread. */
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    thread = CreateThread(NULL, 0, resource_shared_thread, &resource, 0, NULL);
+    ok(WaitForSingleObject(thread_ready, 100) == WAIT_TIMEOUT, "expected timeout\n");
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    pRtlReleaseResource(&resource);
+    ok(!WaitForSingleObject(thread_ready, 1000), "wait failed\n");
+    SetEvent(thread_done);
+    ok(!WaitForSingleObject(thread, 1000), "wait failed\n");
+    CloseHandle(thread);
+
+    /* Acquire the resource as shared, and then spawn an exclusive thread. */
+
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    thread = CreateThread(NULL, 0, resource_exclusive_thread, &resource, 0, NULL);
+    ok(WaitForSingleObject(thread_ready, 100) == WAIT_TIMEOUT, "expected timeout\n");
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == FALSE, "got %u\n", ret);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    pRtlReleaseResource(&resource);
+    ok(!WaitForSingleObject(thread_ready, 1000), "wait failed\n");
+    SetEvent(thread_done);
+    ok(!WaitForSingleObject(thread, 1000), "wait failed\n");
+    CloseHandle(thread);
+
+    /* Spawn a shared and then exclusive waiter. */
+    thread = CreateThread(NULL, 0, resource_shared_thread, &resource, 0, NULL);
+    ok(!WaitForSingleObject(thread_ready, 1000), "wait failed\n");
+    thread2 = CreateThread(NULL, 0, resource_exclusive_thread, &resource, 0, NULL);
+    ok(WaitForSingleObject(thread_ready, 100) == WAIT_TIMEOUT, "expected timeout\n");
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == FALSE, "got %u\n", ret);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    SetEvent(thread_done);
+    ok(!WaitForSingleObject(thread, 1000), "wait failed\n");
+    CloseHandle(thread);
+
+    ok(!WaitForSingleObject(thread_ready, 1000), "wait failed\n");
+    SetEvent(thread_done);
+    ok(!WaitForSingleObject(thread2, 1000), "wait failed\n");
+    CloseHandle(thread2);
+
+    ret = pRtlAcquireResourceExclusive(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+    ret = pRtlAcquireResourceShared(&resource, FALSE);
+    ok(ret == TRUE, "got %u\n", ret);
+    pRtlReleaseResource(&resource);
+
+    CloseHandle(thread_ready);
+    CloseHandle(thread_done);
+    pRtlDeleteResource(&resource);
+}
+
 START_TEST(sync)
 {
     HMODULE module = GetModuleHandleA("ntdll.dll");
@@ -618,7 +776,12 @@ START_TEST(sync)
     pNtResetEvent                   = (void *)GetProcAddress(module, "NtResetEvent");
     pNtSetEvent                     = (void *)GetProcAddress(module, "NtSetEvent");
     pNtWaitForKeyedEvent            = (void *)GetProcAddress(module, "NtWaitForKeyedEvent");
+    pRtlAcquireResourceExclusive    = (void *)GetProcAddress(module, "RtlAcquireResourceExclusive");
+    pRtlAcquireResourceShared       = (void *)GetProcAddress(module, "RtlAcquireResourceShared");
+    pRtlDeleteResource              = (void *)GetProcAddress(module, "RtlDeleteResource");
+    pRtlInitializeResource          = (void *)GetProcAddress(module, "RtlInitializeResource");
     pRtlInitUnicodeString           = (void *)GetProcAddress(module, "RtlInitUnicodeString");
+    pRtlReleaseResource             = (void *)GetProcAddress(module, "RtlReleaseResource");
     pRtlWaitOnAddress               = (void *)GetProcAddress(module, "RtlWaitOnAddress");
     pRtlWakeAddressAll              = (void *)GetProcAddress(module, "RtlWakeAddressAll");
     pRtlWakeAddressSingle           = (void *)GetProcAddress(module, "RtlWakeAddressSingle");
@@ -628,4 +791,5 @@ START_TEST(sync)
     test_mutant();
     test_semaphore();
     test_keyed_events();
+    test_resource();
 }