blob: e2a8388ac1361b3baa8050affcb430794095e275 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// gold-threads.h -- thread support for gold -*- C++ -*-
// gold can be configured to support threads. If threads are
// supported, the user can specify at runtime whether or not to
// support them. This provides an interface to manage locking
// accordingly.
// Lock
// A simple lock class.
#ifndef GOLD_THREADS_H
#define GOLD_THREADS_H
namespace gold
{
class Lock_impl;
class Condvar;
// A simple lock class.
class Lock
{
public:
Lock();
~Lock();
// Acquire the lock.
void
acquire();
// Release the lock.
void
release();
private:
// This class can not be copied.
Lock(const Lock&);
Lock& operator=(const Lock&);
friend class Condvar;
Lock_impl*
get_impl() const
{ return this->lock_; }
Lock_impl* lock_;
};
// RAII for Lock.
class Hold_lock
{
public:
Hold_lock(Lock& lock)
: lock_(lock)
{ this->lock_.acquire(); }
~Hold_lock()
{ this->lock_.release(); }
private:
// This class can not be copied.
Hold_lock(const Hold_lock&);
Hold_lock& operator=(const Hold_lock&);
Lock& lock_;
};
class Condvar_impl;
// A simple condition variable class. It is always associated with a
// specific lock.
class Condvar
{
public:
Condvar(Lock& lock);
~Condvar();
// Wait for the condition variable to be signalled. This should
// only be called when the lock is held.
void
wait();
// Signal the condition variable. This should only be called when
// the lock is held.
void
signal();
private:
// This class can not be copied.
Condvar(const Condvar&);
Condvar& operator=(const Condvar&);
Lock& lock_;
Condvar_impl* condvar_;
};
} // End namespace gold.
#endif // !defined(GOLD_THREADS_H)
|
