Rename RWLockGeneric to RWLockWinXP to more accurately reflect when it's used.

webrtc/system_wrappers/source/rw_lock_generic.cc

-/*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/system_wrappers/source/rw_lock_generic.h"
-
-#include "webrtc/system_wrappers/include/condition_variable_wrapper.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
-
-namespace webrtc {
-
-RWLockGeneric::RWLockGeneric()
-    : readers_active_(0),
-      writer_active_(false),
-      readers_waiting_(0),
-      writers_waiting_(0) {
-  critical_section_ = CriticalSectionWrapper::CreateCriticalSection();
-  read_condition_ = ConditionVariableWrapper::CreateConditionVariable();
-  write_condition_ = ConditionVariableWrapper::CreateConditionVariable();
-}
-
-RWLockGeneric::~RWLockGeneric() {
-  delete write_condition_;
-  delete read_condition_;
-  delete critical_section_;
-}
-
-void RWLockGeneric::AcquireLockExclusive() {
-  CriticalSectionScoped cs(critical_section_);
-  if (writer_active_ || readers_active_ > 0) {
-    ++writers_waiting_;
-    while (writer_active_ || readers_active_ > 0) {
-      write_condition_->SleepCS(*critical_section_);
-    }
-    --writers_waiting_;
-  }
-  writer_active_ = true;
-}
-
-void RWLockGeneric::ReleaseLockExclusive() {
-  CriticalSectionScoped cs(critical_section_);
-  writer_active_ = false;
-  if (writers_waiting_ > 0) {
-    write_condition_->Wake();
-  } else if (readers_waiting_ > 0) {
-    read_condition_->WakeAll();
-  }
-}
-
-void RWLockGeneric::AcquireLockShared() {
-  CriticalSectionScoped cs(critical_section_);
-  if (writer_active_ || writers_waiting_ > 0) {
-    ++readers_waiting_;
-
-    while (writer_active_ || writers_waiting_ > 0) {
-      read_condition_->SleepCS(*critical_section_);
-    }
-    --readers_waiting_;
-  }
-  ++readers_active_;
-}
-
-void RWLockGeneric::ReleaseLockShared() {
-  CriticalSectionScoped cs(critical_section_);
-  --readers_active_;
-  if (readers_active_ == 0 && writers_waiting_ > 0) {
-    write_condition_->Wake();
-  }
-}
-
-}  // namespace webrtc