JackPosixSemaphore.cpp
/*
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
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.
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.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "JackPosixSemaphore.h"
#include "JackTools.h"
#include "JackConstants.h"
#include "JackError.h"
#include <fcntl.h>
#include <stdio.h>
#include <sys/time.h>
namespace Jack
{
void JackPosixSemaphore::BuildName(const char* client_name, const char* server_name, char* res, int size)
{
char ext_client_name[SYNC_MAX_NAME_SIZE + 1];
JackTools::RewriteName(client_name, ext_client_name);
#if __APPLE__ // POSIX semaphore names are limited to 32 characters...
snprintf(res, 32, "js_%s", ext_client_name);
#else
if (getenv("JACK_PROMISCUOUS_SERVER")) {
snprintf(res, size, "jack_sem.%s_%s", server_name, ext_client_name);
} else {
snprintf(res, size, "jack_sem.%d_%s_%s", JackTools::GetUID(), server_name, ext_client_name);
}
#endif
}
bool JackPosixSemaphore::Signal()
{
int res;
if (!fSemaphore) {
jack_error("JackPosixSemaphore::Signal name = %s already deallocated!!", fName);
return false;
}
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;
if (!fSemaphore) {
jack_error("JackPosixSemaphore::SignalAll name = %s already deallocated!!", fName);
return false;
}
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;
if (!fSemaphore) {
jack_error("JackPosixSemaphore::Wait name = %s already deallocated!!", fName);
return false;
}
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);
}
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) // glibc feature test
bool JackPosixSemaphore::TimedWait(long usec)
{
int res;
struct timeval now;
timespec time;
if (!fSemaphore) {
jack_error("JackPosixSemaphore::TimedWait name = %s already deallocated!!", fName);
return false;
}
gettimeofday(&now, 0);
time.tv_sec = now.tv_sec + usec / 1000000;
long tv_usec = (now.tv_usec + (usec % 1000000));
time.tv_sec += tv_usec / 1000000;
time.tv_nsec = (tv_usec % 1000000) * 1000;
while ((res = sem_timedwait(fSemaphore, &time)) < 0) {
jack_error("JackPosixSemaphore::TimedWait err = %s", strerror(errno));
jack_log("JackPosixSemaphore::TimedWait now : %ld %ld ", now.tv_sec, now.tv_usec);
jack_log("JackPosixSemaphore::TimedWait next : %ld %ld ", time.tv_sec, time.tv_nsec/1000);
if (errno != EINTR) {
break;
}
}
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
// Server side : publish the semaphore in the global namespace
bool JackPosixSemaphore::Allocate(const char* name, const char* server_name, int value)
{
BuildName(name, server_name, fName, sizeof(fName));
jack_log("JackPosixSemaphore::Allocate name = %s val = %ld", fName, value);
if ((fSemaphore = sem_open(fName, O_CREAT | O_RDWR, 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, const char* server_name)
{
BuildName(name, server_name, fName, sizeof(fName));
jack_log("JackPosixSemaphore::Connect name = %s", fName);
// Temporary...
if (fSemaphore) {
jack_log("Already connected name = %s", name);
return true;
}
if ((fSemaphore = sem_open(fName, O_RDWR)) == (sem_t*)SEM_FAILED) {
jack_error("Connect: can't connect named semaphore name = %s err = %s", fName, strerror(errno));
return false;
} else if (fSemaphore) {
int val = 0;
sem_getvalue(fSemaphore, &val);
jack_log("JackPosixSemaphore::Connect sem_getvalue %ld", val);
return true;
} else {
jack_error("Connect: fSemaphore not initialized!");
return false;
}
}
bool JackPosixSemaphore::Connect(const char* name, const char* server_name)
{
return ConnectInput(name, server_name);
}
bool JackPosixSemaphore::ConnectOutput(const char* name, const char* server_name)
{
return ConnectInput(name, server_name);
}
bool JackPosixSemaphore::Disconnect()
{
if (fSemaphore) {
jack_log("JackPosixSemaphore::Disconnect name = %s", fName);
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) {
jack_log("JackPosixSemaphore::Destroy name = %s", fName);
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
Jack
Definition: JackAC3Encoder.cpp:30
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108