Make rtc::CriticalSection lockable from f() const.

webrtc/base/criticalsection.cc

 /*
  *  Copyright 2015 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.
  */
 
@@ skipping 18 matching lines @@
 }
 
 CriticalSection::~CriticalSection() {
 #if defined(WEBRTC_WIN)
   DeleteCriticalSection(&crit_);
 #else
   pthread_mutex_destroy(&mutex_);
 #endif
 }
 
-void CriticalSection::Enter() EXCLUSIVE_LOCK_FUNCTION() {
+void CriticalSection::Enter() const EXCLUSIVE_LOCK_FUNCTION() {
 #if defined(WEBRTC_WIN)
   EnterCriticalSection(&crit_);
 #else
   pthread_mutex_lock(&mutex_);
 #if CS_DEBUG_CHECKS
   if (!recursion_count_) {
     RTC_DCHECK(!thread_);
     thread_ = pthread_self();
   } else {
     RTC_DCHECK(CurrentThreadIsOwner());
   }
   ++recursion_count_;
 #endif
 #endif
 }
 
-bool CriticalSection::TryEnter() EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+bool CriticalSection::TryEnter() const EXCLUSIVE_TRYLOCK_FUNCTION(true) {
 #if defined(WEBRTC_WIN)
   return TryEnterCriticalSection(&crit_) != FALSE;
 #else
   if (pthread_mutex_trylock(&mutex_) != 0)
     return false;
 #if CS_DEBUG_CHECKS
   if (!recursion_count_) {
     RTC_DCHECK(!thread_);
     thread_ = pthread_self();
   } else {
     RTC_DCHECK(CurrentThreadIsOwner());
   }
   ++recursion_count_;
 #endif
   return true;
 #endif
 }
-void CriticalSection::Leave() UNLOCK_FUNCTION() {
+void CriticalSection::Leave() const UNLOCK_FUNCTION() {
   RTC_DCHECK(CurrentThreadIsOwner());
 #if defined(WEBRTC_WIN)
   LeaveCriticalSection(&crit_);
 #else
 #if CS_DEBUG_CHECKS
   --recursion_count_;
   RTC_DCHECK(recursion_count_ >= 0);
   if (!recursion_count_)
     thread_ = 0;
 #endif
@@ skipping 23 matching lines @@
   return crit_.LockCount != -1;
 #else
 #if CS_DEBUG_CHECKS
   return thread_ != 0;
 #else
   return true;
 #endif
 #endif
 }
 
-CritScope::CritScope(CriticalSection* cs) : cs_(cs) { cs_->Enter(); }
+CritScope::CritScope(const CriticalSection* cs) : cs_(cs) { cs_->Enter(); }
 CritScope::~CritScope() { cs_->Leave(); }
 
-TryCritScope::TryCritScope(CriticalSection* cs)
+TryCritScope::TryCritScope(const CriticalSection* cs)
     : cs_(cs), locked_(cs->TryEnter()) {
   CS_DEBUG_CODE(lock_was_called_ = false);
 }
 
 TryCritScope::~TryCritScope() {
   CS_DEBUG_CODE(RTC_DCHECK(lock_was_called_));
   if (locked_)
     cs_->Leave();
 }
 
@@ skipping 28 matching lines @@
 GlobalLockScope::GlobalLockScope(GlobalLockPod* lock)
     : lock_(lock) {
   lock_->Lock();
 }
 
 GlobalLockScope::~GlobalLockScope() {
   lock_->Unlock();
 }
 
 }  // namespace rtc