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
|
/*
Copyright (C) 2009 Paul Davis
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <cstdlib>
#include <cerrno>
#include <cstring>
#include <fcntl.h>
#include <unistd.h>
#include "pbd/error.h"
#include "pbd/crossthread.h"
using namespace std;
using namespace PBD;
using namespace Glib;
CrossThreadChannel::CrossThreadChannel (bool non_blocking)
{
_ios = 0;
fds[0] = -1;
fds[1] = -1;
if (pipe (fds)) {
error << "cannot create x-thread pipe for read (%2)" << ::strerror (errno) << endmsg;
return;
}
if (non_blocking) {
if (fcntl (fds[0], F_SETFL, O_NONBLOCK)) {
error << "cannot set non-blocking mode for x-thread pipe (read) (" << ::strerror (errno) << ')' << endmsg;
return;
}
if (fcntl (fds[1], F_SETFL, O_NONBLOCK)) {
error << "cannot set non-blocking mode for x-thread pipe (write) (%2)" << ::strerror (errno) << ')' << endmsg;
return;
}
}
}
CrossThreadChannel::~CrossThreadChannel ()
{
/* glibmm hack */
drop_ios ();
if (fds[0] >= 0) {
close (fds[0]);
fds[0] = -1;
}
if (fds[1] >= 0) {
close (fds[1]);
fds[1] = -1;
}
}
void
CrossThreadChannel::wakeup ()
{
char c = 0;
(void) ::write (fds[1], &c, 1);
}
RefPtr<IOSource>
CrossThreadChannel::ios ()
{
if (!_ios) {
std::cerr << "New x-channel fd " << fds[0] << std::endl;
_ios = new RefPtr<IOSource> (IOSource::create (fds[0], IOCondition(IO_IN|IO_PRI|IO_ERR|IO_HUP|IO_NVAL)));
}
return *_ios;
}
void
CrossThreadChannel::drop_ios ()
{
delete _ios;
_ios = 0;
}
void
CrossThreadChannel::drain ()
{
drain (fds[0]);
}
void
CrossThreadChannel::drain (int fd)
{
/* drain selectable fd */
char buf[64];
while (::read (fd, buf, sizeof (buf)) > 0);
}
int
CrossThreadChannel::deliver (char msg)
{
return ::write (fds[1], &msg, 1);
}
int
CrossThreadChannel::receive (char& msg)
{
return ::read (fds[0], &msg, 1);
}
|
