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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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#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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void JackPosixSemaphore::BuildName(const char* client_name, const char* server_name, char* res)
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char ext_client_name[JACK_CLIENT_NAME_SIZE + 1];
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JackTools::RewriteName(client_name, ext_client_name);
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sprintf(res, "jack_sem.%d_%s_%s", JackTools::GetUID(), server_name, ext_client_name);
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bool JackPosixSemaphore::Signal()
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jack_error("JackPosixSemaphore::Signal name = %s already desallocated!!", fName);
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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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bool JackPosixSemaphore::SignalAll()
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jack_error("JackPosixSemaphore::SignalAll name = %s already desallocated!!", fName);
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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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bool JackPosixSemaphore::Wait()
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jack_error("JackPosixSemaphore::Wait name = %s already desallocated!!", fName);
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if ((res = sem_wait(fSemaphore)) != 0) {
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jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName, strerror(errno));
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bool JackPosixSemaphore::Wait()
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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 (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) // glibc feature test
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bool JackPosixSemaphore::TimedWait(long usec)
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jack_error("JackPosixSemaphore::TimedWait name = %s already desallocated!!", fName);
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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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if ((res = sem_timedwait(fSemaphore, &time)) != 0) {
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jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno));
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jack_log("now %ld %ld ", now.tv_sec, now.tv_usec);
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jack_log("next %ld %ld ", time.tv_sec, time.tv_nsec/1000);
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#warning "JackPosixSemaphore::TimedWait is not supported: Jack in SYNC mode with JackPosixSemaphore will not run properly !!"
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bool JackPosixSemaphore::TimedWait(long usec)
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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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BuildName(name, server_name, 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, 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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// 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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BuildName(name, server_name, fName);
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jack_log("JackPosixSemaphore::Connect %s", fName);
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jack_log("Already connected name = %s", name);
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if ((fSemaphore = sem_open(fName, O_CREAT)) == (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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sem_getvalue(fSemaphore, &val);
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jack_log("JackPosixSemaphore::Connect sem_getvalue %ld", val);
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bool JackPosixSemaphore::Connect(const char* name, const char* server_name)
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return ConnectInput(name, server_name);
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bool JackPosixSemaphore::ConnectOutput(const char* name, const char* server_name)
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return ConnectInput(name, server_name);
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bool JackPosixSemaphore::Disconnect()
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jack_log("JackPosixSemaphore::Disconnect %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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// Server side : destroy the semaphore
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void JackPosixSemaphore::Destroy()
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if (fSemaphore != NULL) {
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jack_log("JackPosixSemaphore::Destroy");
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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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jack_error("JackPosixSemaphore::Destroy semaphore == NULL");
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} // end of namespace