Merge google-perftools r109 (the current contents of third_party/tcmalloc/vendor)

third_party/tcmalloc/chromium/src/windows/mingw.h

 /* Copyright (c) 2007, Google Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  * 
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #ifndef GOOGLE_PERFTOOLS_WINDOWS_MINGW_H_
 #define GOOGLE_PERFTOOLS_WINDOWS_MINGW_H_
 
 #ifdef __MINGW32__
 
 // Older version of the mingw msvcrt don't define _aligned_malloc
 #if __MSVCRT_VERSION__ < 0x0700
 # define PERFTOOLS_NO_ALIGNED_MALLOC 1
 #endif
 
+// This must be defined before the windows.h is included.  We need at
+// least 0x0400 for mutex.h to have access to TryLock, and at least
+// 0x0501 for patch_functions.cc to have access to GetModuleHandleEx.
+// (This latter is an optimization we could take out if need be.)
+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0501
+#endif
+
 #include "windows/port.h"
 
 #define HAVE_SNPRINTF 1
 
+// Some mingw distributions have a pthreads wrapper, but it doesn't
+// work as well as native windows spinlocks (at least for us).  So
+// pretend the pthreads wrapper doesn't exist, even when it does.
+#undef HAVE_PTHREAD
+
 #endif  /* __MINGW32__ */
 
 #endif  /* GOOGLE_PERFTOOLS_WINDOWS_MINGW_H_ */