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