JackMachSemaphore.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 "JackMachSemaphore.h"
#include "JackConstants.h"
#include "JackTools.h"
#include "JackError.h"
#include <stdio.h>
namespace Jack
{
void JackMachSemaphore::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);
snprintf(res, size, "jack_mach_sem.%d_%s_%s", JackTools::GetUID(), server_name, ext_client_name);
}
bool JackMachSemaphore::Signal()
{
if (!fSemaphore) {
jack_error("JackMachSemaphore::Signal name = %s already deallocated!!", fName);
return false;
}
if (fFlush) {
return true;
}
kern_return_t res;
if ((res = semaphore_signal(fSemaphore)) != KERN_SUCCESS) {
jack_error("JackMachSemaphore::Signal name = %s err = %s", fName, mach_error_string(res));
}
return (res == KERN_SUCCESS);
}
bool JackMachSemaphore::SignalAll()
{
if (!fSemaphore) {
jack_error("JackMachSemaphore::SignalAll name = %s already deallocated!!", fName);
return false;
}
if (fFlush) {
return true;
}
kern_return_t res;
// When signaled several times, do not accumulate signals...
if ((res = semaphore_signal_all(fSemaphore)) != KERN_SUCCESS) {
jack_error("JackMachSemaphore::SignalAll name = %s err = %s", fName, mach_error_string(res));
}
return (res == KERN_SUCCESS);
}
bool JackMachSemaphore::Wait()
{
if (!fSemaphore) {
jack_error("JackMachSemaphore::Wait name = %s already deallocated!!", fName);
return false;
}
kern_return_t res;
if ((res = semaphore_wait(fSemaphore)) != KERN_SUCCESS) {
jack_error("JackMachSemaphore::Wait name = %s err = %s", fName, mach_error_string(res));
}
return (res == KERN_SUCCESS);
}
bool JackMachSemaphore::TimedWait(long usec)
{
if (!fSemaphore) {
jack_error("JackMachSemaphore::TimedWait name = %s already deallocated!!", fName);
return false;
}
kern_return_t res;
mach_timespec time;
time.tv_sec = usec / 1000000;
time.tv_nsec = (usec % 1000000) * 1000;
if ((res = semaphore_timedwait(fSemaphore, time)) != KERN_SUCCESS) {
jack_error("JackMachSemaphore::TimedWait name = %s usec = %ld err = %s", fName, usec, mach_error_string(res));
}
return (res == KERN_SUCCESS);
}
// Server side : publish the semaphore in the global namespace
bool JackMachSemaphore::Allocate(const char* name, const char* server_name, int value)
{
BuildName(name, server_name, fName, sizeof(fName));
mach_port_t task = mach_task_self();
kern_return_t res;
if (fBootPort == 0) {
if ((res = task_get_bootstrap_port(task, &fBootPort)) != KERN_SUCCESS) {
jack_error("Allocate: Can't find bootstrap mach port err = %s", mach_error_string(res));
return false;
}
}
if ((res = semaphore_create(task, &fSemaphore, SYNC_POLICY_FIFO, value)) != KERN_SUCCESS) {
jack_error("Allocate: can create semaphore err = %s", mach_error_string(res));
return false;
}
if ((res = bootstrap_register(fBootPort, fName, fSemaphore)) != KERN_SUCCESS) {
jack_error("Allocate: can't check in mach semaphore name = %s err = %s", fName, mach_error_string(res));
switch (res) {
case BOOTSTRAP_SUCCESS :
/* service not currently registered, "a good thing" (tm) */
break;
case BOOTSTRAP_NOT_PRIVILEGED :
jack_log("bootstrap_register(): bootstrap not privileged");
break;
case BOOTSTRAP_SERVICE_ACTIVE :
jack_log("bootstrap_register(): bootstrap service active");
break;
default :
jack_log("bootstrap_register() err = %s", mach_error_string(res));
break;
}
return false;
}
jack_log("JackMachSemaphore::Allocate name = %s", fName);
return true;
}
// Client side : get the published semaphore from server
bool JackMachSemaphore::ConnectInput(const char* name, const char* server_name)
{
BuildName(name, server_name, fName, sizeof(fName));
kern_return_t res;
if (fBootPort == 0) {
if ((res = task_get_bootstrap_port(mach_task_self(), &fBootPort)) != KERN_SUCCESS) {
jack_error("Connect: can't find bootstrap port err = %s", mach_error_string(res));
return false;
}
}
if ((res = bootstrap_look_up(fBootPort, fName, &fSemaphore)) != KERN_SUCCESS) {
jack_error("Connect: can't find mach semaphore name = %s err = %s", fName, mach_error_string(res));
return false;
}
jack_log("JackMachSemaphore::Connect name = %s ", fName);
return true;
}
bool JackMachSemaphore::Connect(const char* name, const char* server_name)
{
return ConnectInput(name, server_name);
}
bool JackMachSemaphore::ConnectOutput(const char* name, const char* server_name)
{
return ConnectInput(name, server_name);
}
bool JackMachSemaphore::Disconnect()
{
if (fSemaphore > 0) {
jack_log("JackMachSemaphore::Disconnect name = %s", fName);
fSemaphore = 0;
}
// Nothing to do
return true;
}
// Server side : destroy the JackGlobals
void JackMachSemaphore::Destroy()
{
kern_return_t res;
if (fSemaphore > 0) {
jack_log("JackMachSemaphore::Destroy name = %s", fName);
if ((res = semaphore_destroy(mach_task_self(), fSemaphore)) != KERN_SUCCESS) {
jack_error("JackMachSemaphore::Destroy can't destroy semaphore err = %s", mach_error_string(res));
}
fSemaphore = 0;
} else {
jack_error("JackMachSemaphore::Destroy semaphore < 0");
}
}
} // 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