net/base/winsock_util.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_BASE_WINSOCK_UTIL_H_
   6 #define NET_BASE_WINSOCK_UTIL_H_
   7
   8 #include <winsock2.h>
   9
  10 namespace net {
  11
  12 // Assert that the (manual-reset) event object is not signaled.
  13 void AssertEventNotSignaled(WSAEVENT hEvent);
  14
  15 // If the (manual-reset) event object is signaled, resets it and returns true.
  16 // Otherwise, does nothing and returns false.  Called after a Winsock function
  17 // succeeds synchronously
  18 //
  19 // Our testing shows that except in rare cases (when running inside QEMU),
  20 // the event object is already signaled at this point, so we call this method
  21 // to avoid a context switch in common cases.  This is just a performance
  22 // optimization.  The code still works if this function simply returns false.
  23 bool ResetEventIfSignaled(WSAEVENT hEvent);
  24
  25 }  // namespace net
  26
  27 #endif  // NET_BASE_WINSOCK_UTIL_H_