JackMachThread.cpp
/*
Copyright (C) 2001 Paul Davis
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 "JackMachThread.h"
#include "JackError.h"
#ifdef MY_TARGET_OS_IPHONE
#include "/Developer/Extras/CoreAudio/PublicUtility/CAHostTimeBase.h"
#endif
namespace Jack
{
int JackMachThread::SetThreadToPriority(jack_native_thread_t thread, UInt32 inPriority, Boolean inIsFixed, UInt64 period, UInt64 computation, UInt64 constraint)
{
if (inPriority == 96) {
// REAL-TIME / TIME-CONSTRAINT THREAD
thread_time_constraint_policy_data_t theTCPolicy;
#ifdef MY_TARGET_OS_IPHONE
theTCPolicy.period = CAHostTimeBase::ConvertFromNanos(period);
theTCPolicy.computation = CAHostTimeBase::ConvertFromNanos(computation);
theTCPolicy.constraint = CAHostTimeBase::ConvertFromNanos(constraint);
#else
theTCPolicy.period = AudioConvertNanosToHostTime(period);
theTCPolicy.computation = AudioConvertNanosToHostTime(computation);
theTCPolicy.constraint = AudioConvertNanosToHostTime(constraint);
#endif
theTCPolicy.preemptible = true;
kern_return_t res = thread_policy_set(pthread_mach_thread_np(thread), THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t) &theTCPolicy, THREAD_TIME_CONSTRAINT_POLICY_COUNT);
jack_log("JackMachThread::thread_policy_set res = %ld", res);
return (res == KERN_SUCCESS) ? 0 : -1;
} else {
// OTHER THREADS
thread_extended_policy_data_t theFixedPolicy;
thread_precedence_policy_data_t thePrecedencePolicy;
SInt32 relativePriority;
// [1] SET FIXED / NOT FIXED
theFixedPolicy.timeshare = !inIsFixed;
thread_policy_set(pthread_mach_thread_np(thread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
// [2] SET PRECEDENCE
// N.B.: We expect that if thread A created thread B, and the program wishes to change
// the priority of thread B, then the call to change the priority of thread B must be
// made by thread A.
// This assumption allows us to use pthread_self() to correctly calculate the priority
// of the feeder thread (since precedency policy's importance is relative to the
// spawning thread's priority.)
relativePriority = inPriority - GetThreadSetPriority(pthread_self());
thePrecedencePolicy.importance = relativePriority;
kern_return_t res = thread_policy_set(pthread_mach_thread_np(thread), THREAD_PRECEDENCE_POLICY, (thread_policy_t) &thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
jack_log("JackMachThread::thread_policy_set res = %ld", res);
return (res == KERN_SUCCESS) ? 0 : -1;
}
}
// returns the thread's priority as it was last set by the API
UInt32 JackMachThread::GetThreadSetPriority(jack_native_thread_t thread)
{
return GetThreadPriority(thread, THREAD_SET_PRIORITY);
}
// returns the thread's priority as it was last scheduled by the Kernel
UInt32 JackMachThread::GetThreadScheduledPriority(jack_native_thread_t thread)
{
return GetThreadPriority(thread, THREAD_SCHEDULED_PRIORITY);
}
UInt32 JackMachThread::GetThreadPriority(jack_native_thread_t thread, int inWhichPriority)
{
thread_basic_info_data_t threadInfo;
policy_info_data_t thePolicyInfo;
unsigned int count;
// get basic info
count = THREAD_BASIC_INFO_COUNT;
thread_info(pthread_mach_thread_np(thread), THREAD_BASIC_INFO, (thread_info_t)&threadInfo, &count);
switch (threadInfo.policy) {
case POLICY_TIMESHARE:
count = POLICY_TIMESHARE_INFO_COUNT;
thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&(thePolicyInfo.ts), &count);
if (inWhichPriority == THREAD_SCHEDULED_PRIORITY) {
return thePolicyInfo.ts.cur_priority;
} else {
return thePolicyInfo.ts.base_priority;
}
break;
case POLICY_FIFO:
count = POLICY_FIFO_INFO_COUNT;
thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_FIFO_INFO, (thread_info_t)&(thePolicyInfo.fifo), &count);
if ( (thePolicyInfo.fifo.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
return thePolicyInfo.fifo.depress_priority;
}
return thePolicyInfo.fifo.base_priority;
break;
case POLICY_RR:
count = POLICY_RR_INFO_COUNT;
thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_RR_INFO, (thread_info_t)&(thePolicyInfo.rr), &count);
if ( (thePolicyInfo.rr.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
return thePolicyInfo.rr.depress_priority;
}
return thePolicyInfo.rr.base_priority;
break;
}
return 0;
}
int JackMachThread::GetParams(jack_native_thread_t thread, UInt64* period, UInt64* computation, UInt64* constraint)
{
thread_time_constraint_policy_data_t theTCPolicy;
mach_msg_type_number_t count = THREAD_TIME_CONSTRAINT_POLICY_COUNT;
boolean_t get_default = false;
kern_return_t res = thread_policy_get(pthread_mach_thread_np(thread),
THREAD_TIME_CONSTRAINT_POLICY,
(thread_policy_t) & theTCPolicy,
&count,
&get_default);
if (res == KERN_SUCCESS) {
#ifdef MY_TARGET_OS_IPHONE
*period = CAHostTimeBase::ConvertToNanos(theTCPolicy.period);
*computation = CAHostTimeBase::ConvertToNanos(theTCPolicy.computation);
*constraint = CAHostTimeBase::ConvertToNanos(theTCPolicy.constraint);
#else
*period = AudioConvertHostTimeToNanos(theTCPolicy.period);
*computation = AudioConvertHostTimeToNanos(theTCPolicy.computation);
*constraint = AudioConvertHostTimeToNanos(theTCPolicy.constraint);
#endif
jack_log("JackMachThread::GetParams period = %ld computation = %ld constraint = %ld", long(*period / 1000.0f), long(*computation / 1000.0f), long(*constraint / 1000.0f));
return 0;
} else {
return -1;
}
}
int JackMachThread::Kill()
{
if (fThread != (jack_native_thread_t)NULL) { // If thread has been started
jack_log("JackMachThread::Kill");
mach_port_t machThread = pthread_mach_thread_np(fThread);
int res = (thread_terminate(machThread) == KERN_SUCCESS) ? 0 : -1;
fStatus = kIdle;
fThread = (jack_native_thread_t)NULL;
return res;
} else {
return -1;
}
}
int JackMachThread::AcquireRealTime()
{
jack_log("JackMachThread::AcquireRealTime fPeriod = %ld fComputation = %ld fConstraint = %ld",
long(fPeriod / 1000), long(fComputation / 1000), long(fConstraint / 1000));
return (fThread != (jack_native_thread_t)NULL) ? AcquireRealTimeImp(fThread, fPeriod, fComputation, fConstraint) : -1;
}
int JackMachThread::AcquireSelfRealTime()
{
jack_log("JackMachThread::AcquireSelfRealTime fPeriod = %ld fComputation = %ld fConstraint = %ld",
long(fPeriod / 1000), long(fComputation / 1000), long(fConstraint / 1000));
return AcquireRealTimeImp(pthread_self(), fPeriod, fComputation, fConstraint);
}
int JackMachThread::AcquireRealTime(int priority)
{
fPriority = priority;
return AcquireRealTime();
}
int JackMachThread::AcquireSelfRealTime(int priority)
{
fPriority = priority;
return AcquireSelfRealTime();
}
int JackMachThread::AcquireRealTimeImp(jack_native_thread_t thread, UInt64 period, UInt64 computation, UInt64 constraint)
{
SetThreadToPriority(thread, 96, true, period, computation, constraint);
return 0;
}
int JackMachThread::DropRealTime()
{
return (fThread != (jack_native_thread_t)NULL) ? DropRealTimeImp(fThread) : -1;
}
int JackMachThread::DropSelfRealTime()
{
return DropRealTimeImp(pthread_self());
}
int JackMachThread::DropRealTimeImp(jack_native_thread_t thread)
{
SetThreadToPriority(thread, 63, false, 0, 0, 0);
return 0;
}
void JackMachThread::SetParams(UInt64 period, UInt64 computation, UInt64 constraint)
{
fPeriod = period;
fComputation = computation;
fConstraint = constraint;
}
} // end of namespace
Jack
Definition: JackAC3Encoder.cpp:30
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108