blob: 749da92a774e899b77be42d18fe7bc97036c657b (
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
|
/*
* Barrier
* (C) 2016 Joel Low
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_UTIL_BARRIER_H_
#define BOTAN_UTIL_BARRIER_H_
#include <mutex>
#include <condition_variable>
namespace Botan {
/**
Barrier implements a barrier synchronization primitive. wait() will
indicate how many threads to synchronize; each thread needing
synchronization should call sync(). When sync() returns, the barrier
is reset to zero, and the m_syncs counter is incremented. m_syncs is a
counter to ensure that wait() can be called after a sync() even if the
previously sleeping threads have not awoken.)
*/
class Barrier final
{
public:
explicit Barrier(int value = 0) : m_value(value), m_syncs(0) {}
void wait(size_t delta);
void sync();
private:
size_t m_value;
size_t m_syncs;
std::mutex m_mutex;
std::condition_variable m_cond;
};
}
#endif
|
