kernel32: Make SetThreadPriorityBoost return success.

dlls/kernel32/tests/thread.c

@@ -713,22 +713,22 @@ static VOID test_thread_priority(void)
                        0,curthreadId);
      ok(access_thread!=NULL,"OpenThread returned an invalid handle\n");
      if (access_thread!=NULL) {
-       obey_ar(pSetThreadPriorityBoost(access_thread,1)==0);
+       todo_wine obey_ar(pSetThreadPriorityBoost(access_thread,1)==0);
        todo_wine obey_ar(pGetThreadPriorityBoost(access_thread,&disabled)==0);
        ok(CloseHandle(access_thread),"Error Closing thread handle\n");
      }
    }
 
+   rc = pSetThreadPriorityBoost(curthread,1);
+   ok( rc != 0, "error=%d\n",GetLastError());
    todo_wine {
-     rc = pSetThreadPriorityBoost(curthread,1);
-     ok( rc != 0, "error=%d\n",GetLastError());
      rc=pGetThreadPriorityBoost(curthread,&disabled);
      ok(rc!=0 && disabled==1,
         "rc=%d error=%d disabled=%d\n",rc,GetLastError(),disabled);
-
-     rc = pSetThreadPriorityBoost(curthread,0);
-     ok( rc != 0, "error=%d\n",GetLastError());
    }
+
+   rc = pSetThreadPriorityBoost(curthread,0);
+   ok( rc != 0, "error=%d\n",GetLastError());
    rc=pGetThreadPriorityBoost(curthread,&disabled);
    ok(rc!=0 && disabled==0,
       "rc=%d error=%d disabled=%d\n",rc,GetLastError(),disabled);

dlls/kernel32/thread.c

@@ -357,18 +357,14 @@ BOOL WINAPI GetThreadPriorityBoost(
 /**********************************************************************
  * SetThreadPriorityBoost [KERNEL32.@]  Sets priority boost for thread.
  *
- * Priority boost is not implemented. This function always returns
- * FALSE and sets last error to ERROR_CALL_NOT_IMPLEMENTED
- *
- * RETURNS
- *    Always returns FALSE to indicate a failure
+ * Priority boost is not implemented, but we return TRUE
+ * anyway because some games crash otherwise.
  */
 BOOL WINAPI SetThreadPriorityBoost(
     HANDLE hthread, /* [in] Handle to thread */
     BOOL disable)   /* [in] TRUE to disable priority boost */
 {
-    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-    return FALSE;
+    return TRUE;
 }