JackPosixSemaphore.cpp 5.79 KB
Newer Older
sletz's avatar
sletz committed
1
/*
sletz's avatar
sletz committed
2
Copyright (C) 2004-2008 Grame
sletz's avatar
sletz committed
3
4

This program is free software; you can redistribute it and/or modify
sletz's avatar
sletz committed
5
6
7
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
sletz's avatar
sletz committed
8

sletz's avatar
sletz committed
9
10
11
12
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 Lesser General Public License for more details.
sletz's avatar
sletz committed
13

sletz's avatar
sletz committed
14
You should have received a copy of the GNU Lesser General Public License
sletz's avatar
sletz committed
15
along with this program; if not, write to the Free Software
sletz's avatar
sletz committed
16
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
sletz's avatar
sletz committed
17
18
19
20

*/

#include "JackPosixSemaphore.h"
sletz's avatar
sletz committed
21
#include "JackConstants.h"
sletz's avatar
sletz committed
22
23
#include "JackError.h"
#include <fcntl.h>
sletz's avatar
sletz committed
24
#include <stdio.h>
sletz's avatar
sletz committed
25
26
27
28
29
#include <sys/time.h>

namespace Jack
{

30
void JackPosixSemaphore::BuildName(const char* name, const char* server_name, char* res)
sletz's avatar
sletz committed
31
{
sletz's avatar
sletz committed
32
    sprintf(res, "jack_sem.%s_%s", server_name, name);
sletz's avatar
sletz committed
33
34
35
36
37
}

bool JackPosixSemaphore::Signal()
{
    int res;
sletz's avatar
sletz committed
38
39
40
41
42

    if (!fSemaphore) {
        jack_error("JackPosixSemaphore::Signal name = %s already desallocated!!", fName);
        return false;
    }
sletz's avatar
sletz committed
43
44
45
46
47
48
49
50
51
52
53
54
55

    if (fFlush)
        return true;

    if ((res = sem_post(fSemaphore)) != 0) {
        jack_error("JackPosixSemaphore::Signal name = %s err = %s", fName, strerror(errno));
    }
    return (res == 0);
}

bool JackPosixSemaphore::SignalAll()
{
    int res;
sletz's avatar
sletz committed
56

57
    if (!fSemaphore) {
sletz's avatar
sletz committed
58
59
60
        jack_error("JackPosixSemaphore::SignalAll name = %s already desallocated!!", fName);
        return false;
    }
sletz's avatar
sletz committed
61
62
63
64
65
66
67
68
69
70
71
72
73
74

    if (fFlush)
        return true;

    if ((res = sem_post(fSemaphore)) != 0) {
        jack_error("JackPosixSemaphore::SignalAll name = %s err = %s", fName, strerror(errno));
    }
    return (res == 0);
}

/*
bool JackPosixSemaphore::Wait()
{
    int res;
sletz's avatar
sletz committed
75

sletz's avatar
sletz committed
76
77
78
79
    if (!fSemaphore) {
        jack_error("JackPosixSemaphore::Wait name = %s already desallocated!!", fName);
        return false;
    }
80

sletz's avatar
sletz committed
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
    if ((res = sem_wait(fSemaphore)) != 0) {
        jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName, strerror(errno));
    }
    return (res == 0);
}
*/

bool JackPosixSemaphore::Wait()
{
    int res;

    while ((res = sem_wait(fSemaphore) < 0)) {
        jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName, strerror(errno));
        if (errno != EINTR)
            break;
    }
    return (res == 0);
}

100
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) // glibc feature test
sletz's avatar
sletz committed
101

102
bool JackPosixSemaphore::TimedWait(long usec) 
sletz's avatar
sletz committed
103
104
105
106
{
	int res;
	struct timeval now;
	timespec time;
sletz's avatar
sletz committed
107

108
109
110
111
	if (!fSemaphore) {
		jack_error("JackPosixSemaphore::TimedWait name = %s already desallocated!!", fName);
		return false;
	}
sletz's avatar
sletz committed
112
113
	gettimeofday(&now, 0);
	time.tv_sec = now.tv_sec + usec / 1000000;
114
115
116
    long tv_usec = (now.tv_usec + (usec % 1000000));
    time.tv_sec += tv_usec / 1000000;
    time.tv_nsec = (tv_usec % 1000000) * 1000;
sletz's avatar
sletz committed
117

sletz's avatar
sletz committed
118
119
    if ((res = sem_timedwait(fSemaphore, &time)) != 0) {
        jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno));
sletz's avatar
sletz committed
120
121
122
        jack_log("now %ld %ld ", now.tv_sec, now.tv_usec);
        jack_log("next %ld %ld ", time.tv_sec, time.tv_nsec/1000);
    }
sletz's avatar
sletz committed
123
124
    return (res == 0);
}
sletz's avatar
sletz committed
125
126

#else
sletz's avatar
sletz committed
127
#warning "JackPosixSemaphore::TimedWait is not supported: Jack in SYNC mode with JackPosixSemaphore will not run properly !!"
sletz's avatar
sletz committed
128

sletz's avatar
sletz committed
129
130
131
132
bool JackPosixSemaphore::TimedWait(long usec)
{
	return Wait();
}
sletz's avatar
sletz committed
133
#endif
sletz's avatar
sletz committed
134
135

// Server side : publish the semaphore in the global namespace
136
bool JackPosixSemaphore::Allocate(const char* name, const char* server_name, int value)
sletz's avatar
sletz committed
137
{
138
    BuildName(name, server_name, fName);
sletz's avatar
sletz committed
139
    jack_log("JackPosixSemaphore::Allocate name = %s val = %ld", fName, value);
sletz's avatar
sletz committed
140
141
142
143
144
145
146
147
148
149

    if ((fSemaphore = sem_open(fName, O_CREAT, 0777, value)) == (sem_t*)SEM_FAILED) {
        jack_error("Allocate: can't check in named semaphore name = %s err = %s", fName, strerror(errno));
        return false;
    } else {
        return true;
    }
}

// Client side : get the published semaphore from server
150
bool JackPosixSemaphore::ConnectInput(const char* name, const char* server_name)
sletz's avatar
sletz committed
151
{
152
    BuildName(name, server_name, fName);
sletz's avatar
sletz committed
153
    jack_log("JackPosixSemaphore::Connect %s", fName);
sletz's avatar
sletz committed
154
155
156

    // Temporary...
    if (fSemaphore) {
sletz's avatar
sletz committed
157
        jack_log("Already connected name = %s", name);
sletz's avatar
sletz committed
158
159
160
161
162
163
164
165
166
        return true;
    }

    if ((fSemaphore = sem_open(fName, O_CREAT)) == (sem_t*)SEM_FAILED) {
        jack_error("Connect: can't connect named semaphore name = %s err = %s", fName, strerror(errno));
        return false;
    } else {
        int val = 0;
        sem_getvalue(fSemaphore, &val);
sletz's avatar
sletz committed
167
        jack_log("JackPosixSemaphore::Connect sem_getvalue %ld", val);
sletz's avatar
sletz committed
168
169
170
171
        return true;
    }
}

172
bool JackPosixSemaphore::Connect(const char* name, const char* server_name)
sletz's avatar
sletz committed
173
{
174
    return ConnectInput(name, server_name);
sletz's avatar
sletz committed
175
176
}

177
bool JackPosixSemaphore::ConnectOutput(const char* name, const char* server_name)
sletz's avatar
sletz committed
178
{
179
    return ConnectInput(name, server_name);
sletz's avatar
sletz committed
180
181
182
183
}

bool JackPosixSemaphore::Disconnect()
{
sletz's avatar
sletz committed
184
    jack_log("JackPosixSemaphore::Disconnect %s", fName);
sletz's avatar
sletz committed
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202

    if (fSemaphore) {
        if (sem_close(fSemaphore) != 0) {
            jack_error("Disconnect: can't disconnect named semaphore name = %s err = %s", fName, strerror(errno));
            return false;
        } else {
            fSemaphore = NULL;
            return true;
        }
    } else {
        return true;
    }
}

// Server side : destroy the semaphore
void JackPosixSemaphore::Destroy()
{
    if (fSemaphore != NULL) {
sletz's avatar
sletz committed
203
        jack_log("JackPosixSemaphore::Destroy");
sletz's avatar
sletz committed
204
205
206
207
208
209
210
211
212
213
214
215
        sem_unlink(fName);
        if (sem_close(fSemaphore) != 0) {
            jack_error("Destroy: can't destroy semaphore name = %s err = %s", fName, strerror(errno));
        }
        fSemaphore = NULL;
    } else {
        jack_error("JackPosixSemaphore::Destroy semaphore == NULL");
    }
}

} // end of namespace