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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* semaphore.cc
*
* Sat Oct 8 17:44:13 CEST 2005
* Copyright 2005 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "semaphore.h"
#include <hugin.hpp>
#include <limits>
#include <assert.h>
#include <string.h>
#include "platform.h"
#if DG_PLATFORM != DG_PLATFORM_WINDOWS
// Make sure we don't include /this/ file's header...
#include <../include/semaphore.h>
#include <errno.h>
#include <stdio.h>
#include <sys/time.h>
#endif
#endif
struct semaphore_private_t {
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
HANDLE semaphore;
#else
sem_t semaphore;
#endif
};
Semaphore::Semaphore(std::size_t initial_count)
{
prv = new struct semaphore_private_t();
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
prv->semaphore = CreateSemaphore(nullptr, // default security attributes
initial_count,
std::numeric_limits<LONG>::max(),
nullptr); // unnamed semaphore
#else
const int pshared = 0;
memset(&prv->semaphore, 0, sizeof(sem_t));
sem_init(&prv->semaphore, pshared, initial_count);
#endif
}
Semaphore::~Semaphore()
{
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
CloseHandle(prv->semaphore);
#else
sem_destroy(&prv->semaphore);
#endif
delete prv;
}
void Semaphore::post()
{
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
ReleaseSemaphore(prv->semaphore, 1, nullptr);
#else
sem_post(&prv->semaphore);
#endif
}
bool Semaphore::wait(const std::chrono::milliseconds& timeout)
{
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
DWORD ret = WaitForSingleObject(prv->semaphore, timeout.count());
if(ret == WAIT_TIMEOUT)
{
return false;
}
assert(ret == WAIT_OBJECT_0);
#else
struct timespec ts;
struct timeval now;
int rv = gettimeofday(&now, nullptr);
assert(rv == 0);
ts->tv_sec = now.tv_sec;
ts->tv_nsec = now.tv_usec * 1000;
// Add timeout
time_t seconds = (time_t)(timeout.count() / 1000);
ts.tv_sec += seconds;
ts.tv_nsec += (long)((timeout.count() - (seconds * 1000)) * 1000000);
// Make sure we don't overflow the nanoseconds.
constexpr long nsec = 1000000000LL;
if(ts.tv_nsec >= nsec)
{
ts.tv_nsec -= nsec;
ts.tv_sec += 1;
}
int ret = sem_timedwait(&prv->semaphore, &ts);
if(ret < 0)
{
if(errno == ETIMEDOUT)
{
return false;
}
perror("sem_timedwait()");
assert(false);
}
#endif
return true;
}
void Semaphore::wait()
{
#if DG_PLATFORM == DG_PLATFORM_WINDOWS
WaitForSingleObject(prv->semaphore, INFINITE);
#else
sem_wait(&prv->semaphore);
#endif
}
|
