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
|
/*
Copyright (C) 2023 Grok Image Compression Inc.
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "messenger.h"
using namespace grk_plugin;
Synch::Synch(std::string const& sent_sem_name, std::string const& receive_ready_sem_name)
: _sent_sem_name(sent_sem_name)
, _receive_ready_sem_name(receive_ready_sem_name)
{
// unlink semaphores in case of previous crash
unlink();
open();
}
Synch::~Synch()
{
close();
unlink();
}
void
Synch::post(SynchDirection dir)
{
auto sem = dir == SYNCH_SENT ? _sent_sem : _receive_ready_sem;
if (sem_post(sem)) {
getMessengerLogger()->error("Error posting to semaphore: %s", strerror(errno));
}
}
void
Synch::wait(SynchDirection dir)
{
auto sem = dir == SYNCH_SENT ? _sent_sem : _receive_ready_sem;
if (sem_wait(sem)) {
getMessengerLogger()->error("Error waiting for semaphore: %s", strerror(errno));
}
}
void
Synch::open()
{
_sent_sem = sem_open(_sent_sem_name.c_str(), O_CREAT, 0666, 0);
if (!_sent_sem) {
getMessengerLogger()->error("Error opening shared memory: %s", strerror(errno));
}
_receive_ready_sem = sem_open(_receive_ready_sem_name.c_str(), O_CREAT, 0666, 1);
if (!_receive_ready_sem) {
getMessengerLogger()->error("Error opening shared memory: %s", strerror(errno));
}
}
void
Synch::close()
{
if (sem_close(_sent_sem)) {
getMessengerLogger()->error("Error closing semaphore %s: %s", _sent_sem_name.c_str(), strerror(errno));
}
if (sem_close(_receive_ready_sem)) {
getMessengerLogger()->error("Error closing semaphore %s: %s", _receive_ready_sem_name.c_str(), strerror(errno));
}
}
void
Synch::unlink()
{
int rc = sem_unlink(_sent_sem_name.c_str());
if (rc == -1 && errno != ENOENT) {
getMessengerLogger()->error("Error unlinking semaphore %s: %s", _sent_sem_name.c_str(), strerror(errno));
}
rc = sem_unlink(_receive_ready_sem_name.c_str());
if (rc == -1 && errno != ENOENT) {
getMessengerLogger()->error("Error unlinking semaphore %s: %s", _receive_ready_sem_name.c_str(), strerror(errno));
}
}
|
