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bae7f79e ILT |
1 | // gold-threads.h -- thread support for gold -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
23 | // gold can be configured to support threads. If threads are |
24 | // supported, the user can specify at runtime whether or not to | |
25 | // support them. This provides an interface to manage locking | |
26 | // accordingly. | |
27 | ||
28 | // Lock | |
29 | // A simple lock class. | |
30 | ||
31 | #ifndef GOLD_THREADS_H | |
32 | #define GOLD_THREADS_H | |
33 | ||
34 | namespace gold | |
35 | { | |
36 | ||
37 | class Lock_impl; | |
38 | class Condvar; | |
39 | ||
40 | // A simple lock class. | |
41 | ||
42 | class Lock | |
43 | { | |
44 | public: | |
45 | Lock(); | |
46 | ~Lock(); | |
47 | ||
48 | // Acquire the lock. | |
49 | void | |
50 | acquire(); | |
51 | ||
52 | // Release the lock. | |
53 | void | |
54 | release(); | |
55 | ||
56 | private: | |
57 | // This class can not be copied. | |
58 | Lock(const Lock&); | |
59 | Lock& operator=(const Lock&); | |
60 | ||
61 | friend class Condvar; | |
62 | Lock_impl* | |
63 | get_impl() const | |
64 | { return this->lock_; } | |
65 | ||
66 | Lock_impl* lock_; | |
67 | }; | |
68 | ||
69 | // RAII for Lock. | |
70 | ||
71 | class Hold_lock | |
72 | { | |
73 | public: | |
74 | Hold_lock(Lock& lock) | |
75 | : lock_(lock) | |
76 | { this->lock_.acquire(); } | |
77 | ||
78 | ~Hold_lock() | |
79 | { this->lock_.release(); } | |
80 | ||
81 | private: | |
82 | // This class can not be copied. | |
83 | Hold_lock(const Hold_lock&); | |
84 | Hold_lock& operator=(const Hold_lock&); | |
85 | ||
86 | Lock& lock_; | |
87 | }; | |
88 | ||
89 | class Condvar_impl; | |
90 | ||
91 | // A simple condition variable class. It is always associated with a | |
92 | // specific lock. | |
93 | ||
94 | class Condvar | |
95 | { | |
96 | public: | |
97 | Condvar(Lock& lock); | |
98 | ~Condvar(); | |
99 | ||
100 | // Wait for the condition variable to be signalled. This should | |
101 | // only be called when the lock is held. | |
102 | void | |
103 | wait(); | |
104 | ||
105 | // Signal the condition variable. This should only be called when | |
106 | // the lock is held. | |
107 | void | |
108 | signal(); | |
109 | ||
110 | private: | |
111 | // This class can not be copied. | |
112 | Condvar(const Condvar&); | |
113 | Condvar& operator=(const Condvar&); | |
114 | ||
115 | Lock& lock_; | |
116 | Condvar_impl* condvar_; | |
117 | }; | |
118 | ||
119 | } // End namespace gold. | |
120 | ||
121 | #endif // !defined(GOLD_THREADS_H) |