2 Copyright (C) 2004-2008 Grame
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published by
6 the Free Software Foundation; either version 2.1 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #include "JackPosixSemaphore.h"
21 #include "JackTools.h"
22 #include "JackConstants.h"
23 #include "JackError.h"
28 #include "promiscuous.h"
34 JackPosixSemaphore::JackPosixSemaphore() : JackSynchro(), fSemaphore(NULL
)
36 const char* promiscuous
= getenv("JACK_PROMISCUOUS_SERVER");
37 fPromiscuous
= (promiscuous
!= NULL
);
39 fPromiscuousGid
= jack_group2gid(promiscuous
);
43 void JackPosixSemaphore::BuildName(const char* client_name
, const char* server_name
, char* res
, int size
)
45 char ext_client_name
[SYNC_MAX_NAME_SIZE
+ 1];
46 JackTools::RewriteName(client_name
, ext_client_name
);
47 #if __APPLE__ // POSIX semaphore names are limited to 32 characters...
48 snprintf(res
, 32, "js_%s", ext_client_name
);
51 snprintf(res
, size
, "jack_sem.%s_%s", server_name
, ext_client_name
);
53 snprintf(res
, size
, "jack_sem.%d_%s_%s", JackTools::GetUID(), server_name
, ext_client_name
);
58 bool JackPosixSemaphore::Signal()
63 jack_error("JackPosixSemaphore::Signal name = %s already deallocated!!", fName
);
71 if ((res
= sem_post(fSemaphore
)) != 0) {
72 jack_error("JackPosixSemaphore::Signal name = %s err = %s", fName
, strerror(errno
));
77 bool JackPosixSemaphore::SignalAll()
82 jack_error("JackPosixSemaphore::SignalAll name = %s already deallocated!!", fName
);
90 if ((res
= sem_post(fSemaphore
)) != 0) {
91 jack_error("JackPosixSemaphore::SignalAll name = %s err = %s", fName
, strerror(errno
));
96 bool JackPosixSemaphore::Wait()
101 jack_error("JackPosixSemaphore::Wait name = %s already deallocated!!", fName
);
105 while ((res
= sem_wait(fSemaphore
) < 0)) {
106 jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName
, strerror(errno
));
107 if (errno
!= EINTR
) {
114 #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) // glibc feature test
116 bool JackPosixSemaphore::TimedWait(long usec
)
123 jack_error("JackPosixSemaphore::TimedWait name = %s already deallocated!!", fName
);
126 gettimeofday(&now
, 0);
127 time
.tv_sec
= now
.tv_sec
+ usec
/ 1000000;
128 long tv_usec
= (now
.tv_usec
+ (usec
% 1000000));
129 time
.tv_sec
+= tv_usec
/ 1000000;
130 time
.tv_nsec
= (tv_usec
% 1000000) * 1000;
132 while ((res
= sem_timedwait(fSemaphore
, &time
)) < 0) {
133 jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno
));
134 jack_log("JackPosixSemaphore::TimedWait now : %ld %ld ", now
.tv_sec
, now
.tv_usec
);
135 jack_log("JackPosixSemaphore::TimedWait next : %ld %ld ", time
.tv_sec
, time
.tv_nsec
/1000);
136 if (errno
!= EINTR
) {
144 #warning "JackPosixSemaphore::TimedWait is not supported: Jack in SYNC mode with JackPosixSemaphore will not run properly !!"
146 bool JackPosixSemaphore::TimedWait(long usec
)
152 // Server side : publish the semaphore in the global namespace
153 bool JackPosixSemaphore::Allocate(const char* name
, const char* server_name
, int value
)
155 BuildName(name
, server_name
, fName
, sizeof(fName
));
156 jack_log("JackPosixSemaphore::Allocate name = %s val = %ld", fName
, value
);
158 if ((fSemaphore
= sem_open(fName
, O_CREAT
| O_RDWR
, 0777, value
)) == (sem_t
*)SEM_FAILED
) {
159 jack_error("Allocate: can't check in named semaphore name = %s err = %s", fName
, strerror(errno
));
164 char sempath
[SYNC_MAX_NAME_SIZE
+13];
165 snprintf(sempath
, sizeof(sempath
), "/dev/shm/sem.%s", fName
);
166 if (jack_promiscuous_perms(-1, sempath
, fPromiscuousGid
) < 0)
174 // Client side : get the published semaphore from server
175 bool JackPosixSemaphore::ConnectInput(const char* name
, const char* server_name
)
177 BuildName(name
, server_name
, fName
, sizeof(fName
));
178 jack_log("JackPosixSemaphore::Connect name = %s", fName
);
182 jack_log("Already connected name = %s", name
);
186 if ((fSemaphore
= sem_open(fName
, O_RDWR
)) == (sem_t
*)SEM_FAILED
) {
187 jack_error("Connect: can't connect named semaphore name = %s err = %s", fName
, strerror(errno
));
189 } else if (fSemaphore
) {
191 sem_getvalue(fSemaphore
, &val
);
192 jack_log("JackPosixSemaphore::Connect sem_getvalue %ld", val
);
195 jack_error("Connect: fSemaphore not initialized!");
200 bool JackPosixSemaphore::Connect(const char* name
, const char* server_name
)
202 return ConnectInput(name
, server_name
);
205 bool JackPosixSemaphore::ConnectOutput(const char* name
, const char* server_name
)
207 return ConnectInput(name
, server_name
);
210 bool JackPosixSemaphore::Disconnect()
213 jack_log("JackPosixSemaphore::Disconnect name = %s", fName
);
214 if (sem_close(fSemaphore
) != 0) {
215 jack_error("Disconnect: can't disconnect named semaphore name = %s err = %s", fName
, strerror(errno
));
226 // Server side : destroy the semaphore
227 void JackPosixSemaphore::Destroy()
229 if (fSemaphore
!= NULL
) {
230 jack_log("JackPosixSemaphore::Destroy name = %s", fName
);
232 if (sem_close(fSemaphore
) != 0) {
233 jack_error("Destroy: can't destroy semaphore name = %s err = %s", fName
, strerror(errno
));
237 jack_error("JackPosixSemaphore::Destroy semaphore == NULL");
241 } // end of namespace