| // Copyright 2011 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // Author: morlovich@google.com (Maksim Orlovich) |
| // |
| // A stub implementation of shared memory for systems where unavailable. |
| // Fails all the operations. |
| |
| #include "pagespeed/kernel/base/null_shared_mem.h" |
| |
| #include "base/logging.h" |
| #include "pagespeed/kernel/base/message_handler.h" |
| |
| namespace net_instaweb { |
| |
| NullSharedMem::NullSharedMem() { |
| } |
| |
| NullSharedMem::~NullSharedMem() { |
| } |
| |
| size_t NullSharedMem::SharedMutexSize() const { |
| return 1; |
| } |
| |
| AbstractSharedMemSegment* NullSharedMem::CreateSegment( |
| const GoogleString& name, size_t size, MessageHandler* handler) { |
| handler->MessageS(kWarning, "Using null shared memory runtime."); |
| return NULL; |
| } |
| |
| AbstractSharedMemSegment* NullSharedMem::AttachToSegment( |
| const GoogleString& name, size_t size, MessageHandler* handler) { |
| return NULL; |
| } |
| |
| void NullSharedMem::DestroySegment(const GoogleString& name, |
| MessageHandler* handler) { |
| // Bug-free client code should never call our DestroySegment since |
| // Create/Attach will fail. |
| LOG(DFATAL) << "Trying to destroy a segment that was never allocated:" |
| << name; |
| } |
| |
| } // namespace net_instaweb |