Implemented the mmTask* functions.

dlls/winmm/winmm.c

@@ -3233,7 +3233,7 @@ struct mm_starter
     HANDLE              event;
 };
 
-DWORD WINAPI mmTaskRun(void* pmt)
+static DWORD WINAPI mmTaskRun(void* pmt)
 {
     struct mm_starter mms;
 
@@ -3244,6 +3244,9 @@ DWORD WINAPI mmTaskRun(void* pmt)
     return 0;
 }
 
+/******************************************************************
+ *		mmTaskCreate (WINMM.@)
+ */
 MMRESULT WINAPI mmTaskCreate(LPTASKCALLBACK cb, HANDLE* ph, DWORD client)
 {
     HANDLE               hThread;
@@ -3251,7 +3254,7 @@ MMRESULT WINAPI mmTaskCreate(LPTASKCALLBACK cb, HANDLE* ph, DWORD client)
     struct mm_starter   *mms;
 
     mms = HeapAlloc(GetProcessHeap(), 0, sizeof(struct mm_starter));
-    if (mms == NULL) { return TASKERR_OUTOFMEMORY; }
+    if (mms == NULL) return TASKERR_OUTOFMEMORY;
 
     mms->cb = cb;
     mms->client = client;
@@ -3268,3 +3271,38 @@ MMRESULT WINAPI mmTaskCreate(LPTASKCALLBACK cb, HANDLE* ph, DWORD client)
     CloseHandle(hThread);
     return 0;
 }
+
+/******************************************************************
+ *		mmTaskBlock (WINMM.@)
+ */
+void     WINAPI mmTaskBlock(HANDLE tid)
+{
+    MSG		msg;
+
+    do
+    {
+	GetMessageA(&msg, 0, 0, 0);
+	if (msg.hwnd) DispatchMessageA(&msg);
+    } while (msg.message != WM_USER);
+}
+
+/******************************************************************
+ *		mmTaskSignal (WINMM.@)
+ */
+BOOL     WINAPI mmTaskSignal(HANDLE tid)
+{
+    return PostThreadMessageW((DWORD)tid, WM_USER, 0, 0);
+}
+
+/******************************************************************
+ *		mmTaskYield (WINMM.@)
+ */
+void     WINAPI mmTaskYield(void) {}
+
+/******************************************************************
+ *		mmGetCurrentTask (WINMM.@)
+ */
+HANDLE   WINAPI mmGetCurrentTask(void)
+{
+    return (HANDLE)GetCurrentThreadId();
+}

dlls/winmm/winmm.spec

@@ -112,6 +112,7 @@
 @ stdcall mixerMessage(long long long long)
 @ stdcall mixerOpen(ptr long long long long)
 @ stdcall mixerSetControlDetails(long ptr long)
+@ stdcall mmGetCurrentTask()
 @ stdcall mmioAdvance(long ptr long)
 @ stdcall mmioAscend(long ptr long)
 @ stdcall mmioClose(long long)
@@ -135,7 +136,10 @@
 @ stdcall mmioStringToFOURCCW(wstr long)
 @ stdcall mmioWrite(long ptr long)
 @ stdcall mmsystemGetVersion()
+@ stdcall mmTaskBlock(long)
 @ stdcall mmTaskCreate(ptr ptr long)
+@ stdcall mmTaskSignal(long)
+@ stdcall mmTaskYield()
 @ stdcall sndPlaySoundA(ptr long)
 @ stdcall sndPlaySoundW(ptr long)
 @ stdcall timeBeginPeriod(long)