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/*
Copyright (C) 2004-2008 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 "JackMachSemaphore.h"
#include "JackError.h"
#include <stdio.h>
namespace Jack
{
mach_port_t JackMachSemaphore::fBootPort = 0;
void JackMachSemaphore::BuildName(const char* name, const char* server_name, char* res)
{
sprintf(res, "jack_mach_sem.%s_%s", server_name, name);
}
bool JackMachSemaphore::Signal()
{
kern_return_t res;
if (!fSemaphore) {
jack_error("JackMachSemaphore::Signal name = %s already desallocated!!", fName);
return false;
}
if (fFlush)
return true;
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()
{
kern_return_t res;
if (!fSemaphore) {
jack_error("JackMachSemaphore::SignalAll name = %s already desallocated!!", fName);
return false;
}
if (fFlush)
return true;
// 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()
{
kern_return_t res;
if (!fSemaphore) {
jack_error("JackMachSemaphore::Wait name = %s already desallocated!!", fName);
return false;
}
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)
{
kern_return_t res;
mach_timespec time;
time.tv_sec = usec / 1000000;
time.tv_nsec = (usec % 1000000) * 1000;
if (!fSemaphore) {
jack_error("JackMachSemaphore::TimedWait name = %s already desallocated!!", fName);
return false;
}
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);
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 :
JackLog("bootstrap_register(): bootstrap not privileged\n");
break;
case BOOTSTRAP_SERVICE_ACTIVE :
JackLog("bootstrap_register(): bootstrap service active\n");
break;
default :
JackLog("bootstrap_register() err = %s\n", mach_error_string(res));
break;
}
return false;
}
JackLog("JackMachSemaphore::Allocate name = %s\n", 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);
kern_return_t res;
// Temporary... A REVOIR
/*
if (fSemaphore > 0) {
JackLog("Already connected name = %s\n", name);
return true;
}
*/
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;
}
JackLog("JackMachSemaphore::Connect name = %s \n", 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) {
JackLog("JackMachSemaphore::Disconnect name = %s\n", fName);
fSemaphore = 0;
}
// Nothing to do
return true;
}
// Server side : destroy the JackGlobals
void JackMachSemaphore::Destroy()
{
kern_return_t res;
if (fSemaphore > 0) {
JackLog("JackMachSemaphore::Destroy\n");
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
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