win: use GetQueuedCompletionStatusEx directly

It was introduced in Vista, so we can assume it's always there now.

src/win/core.c

@@ -423,97 +423,6 @@ int uv_backend_timeout(const uv_loop_t* loop) {
 }
 
 
-static void uv__poll_wine(uv_loop_t* loop, DWORD timeout) {
-  uv__loop_internal_fields_t* lfields;
-  DWORD bytes;
-  ULONG_PTR key;
-  OVERLAPPED* overlapped;
-  uv_req_t* req;
-  int repeat;
-  uint64_t timeout_time;
-  uint64_t user_timeout;
-  int reset_timeout;
-
-  lfields = uv__get_internal_fields(loop);
-  timeout_time = loop->time + timeout;
-
-  if (lfields->flags & UV_METRICS_IDLE_TIME) {
-    reset_timeout = 1;
-    user_timeout = timeout;
-    timeout = 0;
-  } else {
-    reset_timeout = 0;
-  }
-
-  for (repeat = 0; ; repeat++) {
-    /* Only need to set the provider_entry_time if timeout != 0. The function
-     * will return early if the loop isn't configured with UV_METRICS_IDLE_TIME.
-     */
-    if (timeout != 0)
-      uv__metrics_set_provider_entry_time(loop);
-
-    /* Store the current timeout in a location that's globally accessible so
-     * other locations like uv__work_done() can determine whether the queue
-     * of events in the callback were waiting when poll was called.
-     */
-    lfields->current_timeout = timeout;
-
-    GetQueuedCompletionStatus(loop->iocp,
-                              &bytes,
-                              &key,
-                              &overlapped,
-                              timeout);
-
-    if (reset_timeout != 0) {
-      if (overlapped && timeout == 0)
-        uv__metrics_inc_events_waiting(loop, 1);
-      timeout = user_timeout;
-      reset_timeout = 0;
-    }
-
-    /* Placed here because on success the loop will break whether there is an
-     * empty package or not, or if GetQueuedCompletionStatus returned early then
-     * the timeout will be updated and the loop will run again. In either case
-     * the idle time will need to be updated.
-     */
-    uv__metrics_update_idle_time(loop);
-
-    if (overlapped) {
-      uv__metrics_inc_events(loop, 1);
-
-      /* Package was dequeued */
-      req = uv__overlapped_to_req(overlapped);
-      uv__insert_pending_req(loop, req);
-
-      /* Some time might have passed waiting for I/O,
-       * so update the loop time here.
-       */
-      uv_update_time(loop);
-    } else if (GetLastError() != WAIT_TIMEOUT) {
-      /* Serious error */
-      uv_fatal_error(GetLastError(), "GetQueuedCompletionStatus");
-    } else if (timeout > 0) {
-      /* GetQueuedCompletionStatus can occasionally return a little early.
-       * Make sure that the desired timeout target time is reached.
-       */
-      uv_update_time(loop);
-      if (timeout_time > loop->time) {
-        timeout = (DWORD)(timeout_time - loop->time);
-        /* The first call to GetQueuedCompletionStatus should return very
-         * close to the target time and the second should reach it, but
-         * this is not stated in the documentation. To make sure a busy
-         * loop cannot happen, the timeout is increased exponentially
-         * starting on the third round.
-         */
-        timeout += repeat ? (1 << (repeat - 1)) : 0;
-        continue;
-      }
-    }
-    break;
-  }
-}
-
-
 static void uv__poll(uv_loop_t* loop, DWORD timeout) {
   uv__loop_internal_fields_t* lfields;
   BOOL success;
@@ -553,7 +462,7 @@ static void uv__poll(uv_loop_t* loop, DWORD timeout) {
      */
     lfields->current_timeout = timeout;
 
-    success = pGetQueuedCompletionStatusEx(loop->iocp,
+    success = GetQueuedCompletionStatusEx(loop->iocp,
                                           overlappeds,
                                           ARRAY_SIZE(overlappeds),
                                           &count,
@@ -566,7 +475,7 @@ static void uv__poll(uv_loop_t* loop, DWORD timeout) {
     }
 
     /* Placed here because on success the loop will break whether there is an
-     * empty package or not, or if pGetQueuedCompletionStatusEx returned early
+     * empty package or not, or if GetQueuedCompletionStatusEx returned early
      * then the timeout will be updated and the loop will run again. In either
      * case the idle time will need to be updated.
      */
@@ -647,10 +556,7 @@ int uv_run(uv_loop_t *loop, uv_run_mode mode) {
 
     uv__metrics_inc_loop_count(loop);
 
-    if (pGetQueuedCompletionStatusEx)
     uv__poll(loop, timeout);
-    else
-      uv__poll_wine(loop, timeout);
 
     /* Process immediate callbacks (e.g. write_cb) a small fixed number of
      * times to avoid loop starvation.*/

src/win/winapi.c

@@ -36,9 +36,6 @@ sNtQueryDirectoryFile pNtQueryDirectoryFile;
 sNtQuerySystemInformation pNtQuerySystemInformation;
 sNtQueryInformationProcess pNtQueryInformationProcess;
 
-/* Kernel32 function pointers */
-sGetQueuedCompletionStatusEx pGetQueuedCompletionStatusEx;
-
 /* Powrprof.dll function pointer */
 sPowerRegisterSuspendResumeNotification pPowerRegisterSuspendResumeNotification;
 
@@ -55,7 +52,6 @@ void uv__winapi_init(void) {
   HMODULE ntdll_module;
   HMODULE powrprof_module;
   HMODULE user32_module;
-  HMODULE kernel32_module;
   HMODULE ws2_32_module;
   HMODULE api_win_core_file_module;
 
@@ -121,15 +117,6 @@ void uv__winapi_init(void) {
     uv_fatal_error(GetLastError(), "GetProcAddress");
   }
 
-  kernel32_module = GetModuleHandleA("kernel32.dll");
-  if (kernel32_module == NULL) {
-    uv_fatal_error(GetLastError(), "GetModuleHandleA");
-  }
-
-  pGetQueuedCompletionStatusEx = (sGetQueuedCompletionStatusEx) GetProcAddress(
-      kernel32_module,
-      "GetQueuedCompletionStatusEx");
-
   powrprof_module = LoadLibraryExA("powrprof.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
   if (powrprof_module != NULL) {
     pPowerRegisterSuspendResumeNotification = (sPowerRegisterSuspendResumeNotification)

src/win/winapi.h

@@ -4716,14 +4716,6 @@ typedef NTSTATUS (NTAPI *sNtQueryInformationProcess)
 # define ERROR_MUI_FILE_NOT_LOADED 15105
 #endif
 
-typedef BOOL (WINAPI *sGetQueuedCompletionStatusEx)
-             (HANDLE CompletionPort,
-              LPOVERLAPPED_ENTRY lpCompletionPortEntries,
-              ULONG ulCount,
-              PULONG ulNumEntriesRemoved,
-              DWORD dwMilliseconds,
-              BOOL fAlertable);
-
 /* from powerbase.h */
 #ifndef DEVICE_NOTIFY_CALLBACK
 # define DEVICE_NOTIFY_CALLBACK 2
@@ -4818,9 +4810,6 @@ extern sNtQueryDirectoryFile pNtQueryDirectoryFile;
 extern sNtQuerySystemInformation pNtQuerySystemInformation;
 extern sNtQueryInformationProcess pNtQueryInformationProcess;
 
-/* Kernel32 function pointers */
-extern sGetQueuedCompletionStatusEx pGetQueuedCompletionStatusEx;
-
 /* Powrprof.dll function pointer */
 extern sPowerRegisterSuspendResumeNotification pPowerRegisterSuspendResumeNotification;