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/*
Copyright (C) 2004-2006 Grame
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 "JackPosixSemaphore.h"
#include "JackChannel.h"
#include "JackError.h"
#include <fcntl.h>
#include <sys/time.h>
namespace Jack
{
void JackPosixSemaphore::BuildName(const char* name, char* res)
{
sprintf(res, "%s/jack_sem.%s", jack_client_dir, name);
}
bool JackPosixSemaphore::Signal()
{
int res;
assert(fSemaphore);
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;
assert(fSemaphore);
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;
assert(fSemaphore);
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);
}
/*
#ifdef __linux__
bool JackPosixSemaphore::TimedWait(long usec) // unusable semantic !!
{
int res;
struct timeval now;
timespec time;
assert(fSemaphore);
gettimeofday(&now, 0);
time.tv_sec = now.tv_sec + usec / 1000000;
time.tv_nsec = (now.tv_usec + (usec % 1000000)) * 1000;
if ((res = sem_timedwait(fSemaphore, &time)) != 0) {
jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno));
JackLog("now %ld %ld \n", now.tv_sec, now.tv_usec);
JackLog("next %ld %ld \n", time.tv_sec, time.tv_nsec/1000);
}
return (res == 0);
}
#else
#warning "JackPosixSemaphore::TimedWait is not supported: Jack in SYNC mode with JackPosixSemaphore will not run properly !!"
bool JackPosixSemaphore::TimedWait(long usec)
{
return Wait();
}
#endif
*/
#warning JackPosixSemaphore::TimedWait not available : synchronous mode may not work correctly if POSIX semaphore are used
bool JackPosixSemaphore::TimedWait(long usec)
{
return Wait();
}
// Server side : publish the semaphore in the global namespace
bool JackPosixSemaphore::Allocate(const char* name, int value)
{
BuildName(name, fName);
JackLog("JackPosixSemaphore::Allocate name = %s val = %ld\n", fName, value);
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
bool JackPosixSemaphore::ConnectInput(const char* name)
{
BuildName(name, fName);
JackLog("JackPosixSemaphore::Connect %s\n", fName);
// Temporary...
if (fSemaphore) {
JackLog("Already connected name = %s\n", name);
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);
JackLog("JackPosixSemaphore::Connect sem_getvalue %ld\n", val);
return true;
}
}
bool JackPosixSemaphore::Connect(const char* name)
{
return ConnectInput(name);
}
bool JackPosixSemaphore::ConnectOutput(const char* name)
{
return ConnectInput(name);
}
bool JackPosixSemaphore::Disconnect()
{
JackLog("JackPosixSemaphore::Disconnect %s\n", fName);
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) {
JackLog("JackPosixSemaphore::Destroy\n");
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
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