28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/*
|
|
* libjingle
|
|
* Copyright 2009, Google Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*/
|
|
|
|
#include "talk/base/filelock.h"
|
|
|
|
#include "talk/base/fileutils.h"
|
|
#include "talk/base/logging.h"
|
|
#include "talk/base/pathutils.h"
|
|
#include "talk/base/stream.h"
|
|
|
|
namespace talk_base {
|
|
|
|
FileLock::FileLock(const std::string& path, FileStream* file)
|
|
: path_(path), file_(file) {
|
|
}
|
|
|
|
FileLock::~FileLock() {
|
|
MaybeUnlock();
|
|
}
|
|
|
|
void FileLock::Unlock() {
|
|
LOG_F(LS_INFO);
|
|
MaybeUnlock();
|
|
}
|
|
|
|
void FileLock::MaybeUnlock() {
|
|
if (file_) {
|
|
LOG(LS_INFO) << "Unlocking:" << path_;
|
|
file_->Close();
|
|
Filesystem::DeleteFile(path_);
|
|
file_.reset();
|
|
}
|
|
}
|
|
|
|
FileLock* FileLock::TryLock(const std::string& path) {
|
|
FileStream* stream = new FileStream();
|
|
bool ok = false;
|
|
#ifdef WIN32
|
|
// Open and lock in a single operation.
|
|
ok = stream->OpenShare(path, "a", _SH_DENYRW, NULL);
|
|
#else // Linux and OSX
|
|
ok = stream->Open(path, "a", NULL) && stream->TryLock();
|
|
#endif
|
|
if (ok) {
|
|
return new FileLock(path, stream);
|
|
} else {
|
|
// Something failed, either we didn't succeed to open the
|
|
// file or we failed to lock it. Anyway remove the heap
|
|
// allocated object and then return NULL to indicate failure.
|
|
delete stream;
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
} // namespace talk_base
|