blob: 3fc0897faf6552721f6326b41bd3e728fcc3e05c (
plain) (
blame)
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
|
//
// Semaphore_POSIX.h
//
// Library: Foundation
// Package: Threading
// Module: Semaphore
//
// Definition of the SemaphoreImpl class for POSIX Threads.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_Semaphore_POSIX_INCLUDED
#define Foundation_Semaphore_POSIX_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include <pthread.h>
#include <errno.h>
namespace Poco {
class Foundation_API SemaphoreImpl
{
protected:
SemaphoreImpl(int n, int max);
~SemaphoreImpl();
void setImpl();
void waitImpl();
bool waitImpl(long milliseconds);
private:
volatile int _n;
int _max;
pthread_mutex_t _mutex;
pthread_cond_t _cond;
};
//
// inlines
//
inline void SemaphoreImpl::setImpl()
{
if (pthread_mutex_lock(&_mutex))
throw SystemException("cannot signal semaphore (lock)");
if (_n < _max)
{
++_n;
}
else
{
pthread_mutex_unlock(&_mutex);
throw SystemException("cannot signal semaphore: count would exceed maximum");
}
if (pthread_cond_signal(&_cond))
{
pthread_mutex_unlock(&_mutex);
throw SystemException("cannot signal semaphore");
}
pthread_mutex_unlock(&_mutex);
}
} // namespace Poco
#endif // Foundation_Semaphore_POSIX_INCLUDED
|
