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1 // Copyright (c) 2012 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 #ifndef RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_ | |
6 #define RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_ | |
7 | |
8 #include <pthread.h> | |
9 | |
10 class FilePath; | |
11 | |
12 namespace rlz_lib { | |
13 | |
14 // Creating a recursive cross-process mutex on Windows is one line. On POSIX, | |
15 // there's no primitive for that, so this lock is emulated by an in-process | |
16 // mutex to get the recursive part, followed by a cross-process lock for the | |
17 // cross-process part. | |
18 // This is a struct so that it doesn't need a static initializer. | |
19 struct RecursiveCrossProcessLock { | |
20 // Tries to acquire a recursive cross-process lock. Note that this _always_ | |
21 // acquires the in-process lock (if it wasn't already acquired). The parent | |
22 // directory of |lock_file| must exist. | |
23 bool TryGetCrossProcessLock(const FilePath& lock_filename); | |
24 | |
25 // Releases the lock. Should always be called, even if | |
26 // TryGetCrossProcessLock() returned |false|. | |
27 void ReleaseLock(); | |
28 | |
29 pthread_mutex_t recursive_lock_; | |
Roger Tawa OOO till Jul 10th
2012/11/26 19:16:51
should these members be made private?
Ivan Korotkov
2012/11/27 11:37:25
Nah, unfortunately, that would make the RCPLock no
| |
30 pthread_t locking_thread_; | |
31 | |
32 int file_lock_; | |
33 }; | |
34 | |
35 // On Mac, PTHREAD_RECURSIVE_MUTEX_INITIALIZER doesn't exist before 10.7 and | |
36 // is buggy on 10.7 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906#c34), | |
37 // so emulate recursive locking with a normal non-recursive mutex. | |
38 #define RECURSIVE_CROSS_PROCESS_LOCK_INITIALIZER \ | |
39 { PTHREAD_MUTEX_INITIALIZER, 0, -1 } | |
40 | |
41 } // namespace rlz_lib | |
42 | |
43 #endif // RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_ | |
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