3 * Copyright 2009, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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28 #include "talk/base/filelock.h"
30 #include "talk/base/fileutils.h"
31 #include "talk/base/logging.h"
32 #include "talk/base/pathutils.h"
33 #include "talk/base/stream.h"
37 FileLock::FileLock(const std::string& path, FileStream* file)
38 : path_(path), file_(file) {
41 FileLock::~FileLock() {
45 void FileLock::Unlock() {
50 void FileLock::MaybeUnlock() {
52 LOG(LS_INFO) << "Unlocking:" << path_;
54 Filesystem::DeleteFile(path_);
59 FileLock* FileLock::TryLock(const std::string& path) {
60 FileStream* stream = new FileStream();
63 // Open and lock in a single operation.
64 ok = stream->OpenShare(path, "a", _SH_DENYRW, NULL);
65 #else // Linux and OSX
66 ok = stream->Open(path, "a", NULL) && stream->TryLock();
69 return new FileLock(path, stream);
71 // Something failed, either we didn't succeed to open the
72 // file or we failed to lock it. Anyway remove the heap
73 // allocated object and then return NULL to indicate failure.
79 } // namespace talk_base