1// Copyright (c) 2010 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/common/multi_process_lock.h"
6
7#include "base/logging.h"
8#include "base/mac/scoped_cftyperef.h"
9#include "base/sys_string_conversions.h"
10
11class MultiProcessLockMac : public MultiProcessLock {
12 public:
13  explicit MultiProcessLockMac(const std::string& name) : name_(name) { }
14
15  virtual ~MultiProcessLockMac() {
16    if (port_ != NULL) {
17      Unlock();
18    }
19  }
20
21  virtual bool TryLock() {
22    if (port_ != NULL) {
23      DLOG(ERROR) << "MultiProcessLock is already locked - " << name_;
24      return true;
25    }
26
27    if (name_.length() > MULTI_PROCESS_LOCK_NAME_MAX_LEN) {
28      LOG(ERROR) << "Socket name too long (" << name_.length()
29                 << " > " << MULTI_PROCESS_LOCK_NAME_MAX_LEN << ") - " << name_;
30      return false;
31    }
32
33    CFStringRef cf_name(base::SysUTF8ToCFStringRef(name_));
34    base::mac::ScopedCFTypeRef<CFStringRef> scoped_cf_name(cf_name);
35    port_.reset(CFMessagePortCreateLocal(NULL, cf_name, NULL, NULL, NULL));
36    return port_ != NULL;
37  }
38
39  virtual void Unlock() {
40    if (port_ == NULL) {
41      DLOG(ERROR) << "Over-unlocked MultiProcessLock - " << name_;
42      return;
43    }
44    port_.reset();
45  }
46
47 private:
48  std::string name_;
49  base::mac::ScopedCFTypeRef<CFMessagePortRef> port_;
50  DISALLOW_COPY_AND_ASSIGN(MultiProcessLockMac);
51};
52
53MultiProcessLock* MultiProcessLock::Create(const std::string &name) {
54  return new MultiProcessLockMac(name);
55}
56