Migrate from CRITICAL_SECTION to SRWLOCK

base/synchronization/lock.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SYNCHRONIZATION_LOCK_H_
 #define BASE_SYNCHRONIZATION_LOCK_H_
 
 #include "base/base_export.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 20 matching lines @@
   // by a thread already holding the lock (what happens is undefined and an
   // assertion may fail).
   bool Try() { return lock_.Try(); }
 
   // Null implementation if not debug.
   void AssertAcquired() const {}
 #else
   Lock();
   ~Lock();
 
-  // NOTE: Although windows critical sections support recursive locks, we do not
-  // allow this, and we will commonly fire a DCHECK() if a thread attempts to
-  // acquire the lock a second time (while already holding it).
+  // NOTE: We do not permit recursive locks and will commonly fire a DCHECK() if
+  // a thread attempts to acquire the lock a second time (while already holding
+  // it).
   void Acquire() {
     lock_.Lock();
     CheckUnheldAndMark();
   }
   void Release() {
     CheckHeldAndUnmark();
     lock_.Unlock();
   }
 
   bool Try() {
@@ skipping 73 matching lines @@
   }
 
  private:
   Lock& lock_;
   DISALLOW_COPY_AND_ASSIGN(AutoUnlock);
 };
 
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_LOCK_H_