241 lines
6.9 KiB
C++
241 lines
6.9 KiB
C++
/*
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Copyright (C) 2004-2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "JackPosixSemaphore.h"
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#include "JackTools.h"
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#include "JackConstants.h"
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#include "JackError.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <sys/time.h>
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#ifdef __linux__
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#include "promiscuous.h"
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#endif
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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#define JACK_SEM_PREFIX "/jack_sem"
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#define SEM_DEFAULT_O 0
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#else
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#define JACK_SEM_PREFIX "jack_sem"
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#define SEM_DEFAULT_O O_RDWR
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#endif
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namespace Jack
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{
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JackPosixSemaphore::JackPosixSemaphore() : JackSynchro(), fSemaphore(NULL)
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{
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const char* promiscuous = getenv("JACK_PROMISCUOUS_SERVER");
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fPromiscuous = (promiscuous != NULL);
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#ifdef __linux__
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fPromiscuousGid = jack_group2gid(promiscuous);
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#endif
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}
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void JackPosixSemaphore::BuildName(const char* client_name, const char* server_name, char* res, int size)
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{
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char ext_client_name[SYNC_MAX_NAME_SIZE + 1];
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JackTools::RewriteName(client_name, ext_client_name);
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#if __APPLE__ // POSIX semaphore names are limited to 32 characters...
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snprintf(res, 32, "js_%s", ext_client_name);
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#else
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if (fPromiscuous) {
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snprintf(res, size, JACK_SEM_PREFIX ".%s_%s", server_name, ext_client_name);
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} else {
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snprintf(res, size, JACK_SEM_PREFIX ".%d_%s_%s", JackTools::GetUID(), server_name, ext_client_name);
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}
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#endif
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}
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bool JackPosixSemaphore::Signal()
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{
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int res;
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if (!fSemaphore) {
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jack_error("JackPosixSemaphore::Signal name = %s already deallocated!!", fName);
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return false;
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}
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if (fFlush) {
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return true;
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}
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if ((res = sem_post(fSemaphore)) != 0) {
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jack_error("JackPosixSemaphore::Signal name = %s err = %s", fName, strerror(errno));
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}
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return (res == 0);
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}
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bool JackPosixSemaphore::SignalAll()
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{
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int res;
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if (!fSemaphore) {
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jack_error("JackPosixSemaphore::SignalAll name = %s already deallocated!!", fName);
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return false;
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}
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if (fFlush) {
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return true;
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}
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if ((res = sem_post(fSemaphore)) != 0) {
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jack_error("JackPosixSemaphore::SignalAll name = %s err = %s", fName, strerror(errno));
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}
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return (res == 0);
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}
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bool JackPosixSemaphore::Wait()
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{
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int res;
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if (!fSemaphore) {
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jack_error("JackPosixSemaphore::Wait name = %s already deallocated!!", fName);
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return false;
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}
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while ((res = sem_wait(fSemaphore) < 0)) {
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jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName, strerror(errno));
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if (errno != EINTR) {
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break;
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}
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}
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return (res == 0);
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}
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bool JackPosixSemaphore::TimedWait(long usec)
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{
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int res;
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struct timeval now;
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timespec time;
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if (!fSemaphore) {
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jack_error("JackPosixSemaphore::TimedWait name = %s already deallocated!!", fName);
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return false;
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}
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gettimeofday(&now, 0);
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time.tv_sec = now.tv_sec + usec / 1000000;
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long tv_usec = (now.tv_usec + (usec % 1000000));
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time.tv_sec += tv_usec / 1000000;
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time.tv_nsec = (tv_usec % 1000000) * 1000;
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while ((res = sem_timedwait(fSemaphore, &time)) < 0) {
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jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno));
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jack_log("JackPosixSemaphore::TimedWait now : %ld %ld ", now.tv_sec, now.tv_usec);
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jack_log("JackPosixSemaphore::TimedWait next : %ld %ld ", time.tv_sec, time.tv_nsec/1000);
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if (errno != EINTR) {
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break;
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}
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}
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return (res == 0);
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}
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// Server side : publish the semaphore in the global namespace
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bool JackPosixSemaphore::Allocate(const char* name, const char* server_name, int value)
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{
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BuildName(name, server_name, fName, sizeof(fName));
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jack_log("JackPosixSemaphore::Allocate name = %s val = %ld", fName, value);
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if ((fSemaphore = sem_open(fName, O_CREAT | SEM_DEFAULT_O, 0777, value)) == (sem_t*)SEM_FAILED) {
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jack_error("Allocate: can't check in named semaphore name = %s err = %s", fName, strerror(errno));
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return false;
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} else {
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#ifdef __linux__
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if (fPromiscuous) {
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char sempath[SYNC_MAX_NAME_SIZE+13];
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snprintf(sempath, sizeof(sempath), "/dev/shm/sem.%s", fName);
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if (jack_promiscuous_perms(-1, sempath, fPromiscuousGid) < 0)
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return false;
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}
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#endif
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return true;
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}
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}
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// Client side : get the published semaphore from server
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bool JackPosixSemaphore::ConnectInput(const char* name, const char* server_name)
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{
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BuildName(name, server_name, fName, sizeof(fName));
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jack_log("JackPosixSemaphore::Connect name = %s", fName);
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// Temporary...
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if (fSemaphore) {
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jack_log("Already connected name = %s", name);
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return true;
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}
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if ((fSemaphore = sem_open(fName, SEM_DEFAULT_O)) == (sem_t*)SEM_FAILED) {
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jack_error("Connect: can't connect named semaphore name = %s err = %s", fName, strerror(errno));
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return false;
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} else if (fSemaphore) {
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int val = 0;
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sem_getvalue(fSemaphore, &val);
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jack_log("JackPosixSemaphore::Connect sem_getvalue %ld", val);
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return true;
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} else {
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jack_error("Connect: fSemaphore not initialized!");
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return false;
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}
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}
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bool JackPosixSemaphore::Connect(const char* name, const char* server_name)
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{
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return ConnectInput(name, server_name);
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}
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bool JackPosixSemaphore::ConnectOutput(const char* name, const char* server_name)
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{
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return ConnectInput(name, server_name);
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}
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bool JackPosixSemaphore::Disconnect()
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{
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if (fSemaphore) {
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jack_log("JackPosixSemaphore::Disconnect name = %s", fName);
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if (sem_close(fSemaphore) != 0) {
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jack_error("Disconnect: can't disconnect named semaphore name = %s err = %s", fName, strerror(errno));
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return false;
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} else {
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fSemaphore = NULL;
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return true;
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}
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} else {
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return true;
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}
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}
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// Server side : destroy the semaphore
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void JackPosixSemaphore::Destroy()
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{
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if (fSemaphore != NULL) {
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jack_log("JackPosixSemaphore::Destroy name = %s", fName);
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sem_unlink(fName);
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if (sem_close(fSemaphore) != 0) {
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jack_error("Destroy: can't destroy semaphore name = %s err = %s", fName, strerror(errno));
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}
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fSemaphore = NULL;
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} else {
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jack_error("JackPosixSemaphore::Destroy semaphore == NULL");
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}
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}
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} // end of namespace
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