89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: kenton@google.com (Kenton Varda)
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//
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// emulates google3/base/once.h
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//
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// This header is intended to be included only by internal .cc files and
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// generated .pb.cc files. Users should not use this directly.
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#include <google/protobuf/stubs/once.h>
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namespace google {
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namespace protobuf {
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#ifdef _WIN32
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struct ProtobufOnceInternal {
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ProtobufOnceInternal() {
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InitializeCriticalSection(&critical_section);
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}
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~ProtobufOnceInternal() {
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DeleteCriticalSection(&critical_section);
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}
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CRITICAL_SECTION critical_section;
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};
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ProtobufOnceType::~ProtobufOnceType()
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{
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delete internal_;
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internal_ = NULL;
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}
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ProtobufOnceType::ProtobufOnceType() {
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// internal_ may be non-NULL if Init() was already called.
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if (internal_ == NULL) internal_ = new ProtobufOnceInternal;
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}
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void ProtobufOnceType::Init(void (*init_func)()) {
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// internal_ may be NULL if we're still in dynamic initialization and the
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// constructor has not been called yet. As mentioned in once.h, we assume
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// that the program is still single-threaded at this time, and therefore it
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// should be safe to initialize internal_ like so.
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if (internal_ == NULL) internal_ = new ProtobufOnceInternal;
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EnterCriticalSection(&internal_->critical_section);
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if (!initialized_) {
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init_func();
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initialized_ = true;
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}
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LeaveCriticalSection(&internal_->critical_section);
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}
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#endif
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} // namespace protobuf
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} // namespace google
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