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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | ||
16 | #ifndef CEPH_LOCALLOCK_H | |
17 | #define CEPH_LOCALLOCK_H | |
18 | ||
19 | #include "SimpleLock.h" | |
20 | ||
21 | class LocalLock : public SimpleLock { | |
22 | public: | |
23 | client_t last_wrlock_client; | |
24 | ||
25 | LocalLock(MDSCacheObject *o, LockType *t) : | |
26 | SimpleLock(o, t) { | |
27 | set_state(LOCK_LOCK); // always. | |
28 | } | |
29 | ||
30 | bool is_locallock() const override { | |
31 | return true; | |
32 | } | |
33 | ||
34 | bool can_xlock_local() const { | |
35 | return !is_wrlocked() && (get_xlock_by() == MutationRef()); | |
36 | } | |
37 | ||
38 | bool can_wrlock() const { | |
39 | return !is_xlocked(); | |
40 | } | |
41 | void get_wrlock(client_t client) { | |
42 | assert(can_wrlock()); | |
43 | SimpleLock::get_wrlock(); | |
44 | last_wrlock_client = client; | |
45 | } | |
46 | void put_wrlock() { | |
47 | SimpleLock::put_wrlock(); | |
48 | if (get_num_wrlocks() == 0) | |
49 | last_wrlock_client = client_t(); | |
50 | } | |
51 | client_t get_last_wrlock_client() const { | |
52 | return last_wrlock_client; | |
53 | } | |
54 | ||
55 | void print(ostream& out) const override { | |
56 | out << "("; | |
57 | _print(out); | |
58 | if (last_wrlock_client >= 0) | |
59 | out << " last_client=" << last_wrlock_client; | |
60 | out << ")"; | |
61 | } | |
62 | }; | |
63 | ||
64 | ||
65 | #endif |