macosx/JackMachThread.mm

   1 /*
   2 Copyright (C) 2001 Paul Davis
   3 Copyright (C) 2004-2008 Grame
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19 */
  20
  21
  22 #include "JackMachThread.h"
  23 #include "JackError.h"
  24
  25 #ifdef MY_TARGET_OS_IPHONE
  26 #include "/Developer/Extras/CoreAudio/PublicUtility/CAHostTimeBase.h"
  27 #endif
  28
  29 namespace Jack
  30 {
  31
  32 int JackMachThread::SetThreadToPriority(jack_native_thread_t thread, UInt32 inPriority, Boolean inIsFixed, UInt64 period, UInt64 computation, UInt64 constraint)
  33 {
  34     if (inPriority == 96) {
  35         // REAL-TIME / TIME-CONSTRAINT THREAD
  36         thread_time_constraint_policy_data_t    theTCPolicy;
  37
  38 #ifdef MY_TARGET_OS_IPHONE
  39         theTCPolicy.period = CAHostTimeBase::ConvertFromNanos(period);
  40         theTCPolicy.computation = CAHostTimeBase::ConvertFromNanos(computation);
  41         theTCPolicy.constraint = CAHostTimeBase::ConvertFromNanos(constraint);
  42 #else
  43         theTCPolicy.period = AudioConvertNanosToHostTime(period);
  44         theTCPolicy.computation = AudioConvertNanosToHostTime(computation);
  45         theTCPolicy.constraint = AudioConvertNanosToHostTime(constraint);
  46 #endif
  47         theTCPolicy.preemptible = true;
  48         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);
  49         jack_log("JackMachThread::thread_policy_set res = %ld", res);
  50         return (res == KERN_SUCCESS) ? 0 : -1;
  51     } else {
  52         // OTHER THREADS
  53         thread_extended_policy_data_t theFixedPolicy;
  54         thread_precedence_policy_data_t thePrecedencePolicy;
  55         SInt32 relativePriority;
  56
  57         // [1] SET FIXED / NOT FIXED
  58         theFixedPolicy.timeshare = !inIsFixed;
  59         thread_policy_set(pthread_mach_thread_np(thread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
  60
  61         // [2] SET PRECEDENCE
  62         // N.B.: We expect that if thread A created thread B, and the program wishes to change
  63         // the priority of thread B, then the call to change the priority of thread B must be
  64         // made by thread A.
  65         // This assumption allows us to use pthread_self() to correctly calculate the priority
  66         // of the feeder thread (since precedency policy's importance is relative to the
  67         // spawning thread's priority.)
  68         relativePriority = inPriority - GetThreadSetPriority(pthread_self());
  69
  70         thePrecedencePolicy.importance = relativePriority;
  71         kern_return_t res = thread_policy_set(pthread_mach_thread_np(thread), THREAD_PRECEDENCE_POLICY, (thread_policy_t) &thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
  72         jack_log("JackMachThread::thread_policy_set res = %ld", res);
  73         return (res == KERN_SUCCESS) ? 0 : -1;
  74     }
  75 }
  76
  77 // returns the thread's priority as it was last set by the API
  78 UInt32 JackMachThread::GetThreadSetPriority(jack_native_thread_t thread)
  79 {
  80     return GetThreadPriority(thread, THREAD_SET_PRIORITY);
  81 }
  82
  83 // returns the thread's priority as it was last scheduled by the Kernel
  84 UInt32 JackMachThread::GetThreadScheduledPriority(jack_native_thread_t thread)
  85 {
  86     return GetThreadPriority(thread, THREAD_SCHEDULED_PRIORITY);
  87 }
  88
  89 UInt32 JackMachThread::GetThreadPriority(jack_native_thread_t thread, int inWhichPriority)
  90 {
  91     thread_basic_info_data_t threadInfo;
  92     policy_info_data_t thePolicyInfo;
  93     unsigned int count;
  94
  95     // get basic info
  96     count = THREAD_BASIC_INFO_COUNT;
  97     thread_info(pthread_mach_thread_np(thread), THREAD_BASIC_INFO, (thread_info_t)&threadInfo, &count);
  98
  99     switch (threadInfo.policy) {
 100         case POLICY_TIMESHARE:
 101             count = POLICY_TIMESHARE_INFO_COUNT;
 102             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&(thePolicyInfo.ts), &count);
 103             if (inWhichPriority == THREAD_SCHEDULED_PRIORITY) {
 104                 return thePolicyInfo.ts.cur_priority;
 105             } else {
 106                 return thePolicyInfo.ts.base_priority;
 107             }
 108             break;
 109
 110         case POLICY_FIFO:
 111             count = POLICY_FIFO_INFO_COUNT;
 112             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_FIFO_INFO, (thread_info_t)&(thePolicyInfo.fifo), &count);
 113             if ( (thePolicyInfo.fifo.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
 114                 return thePolicyInfo.fifo.depress_priority;
 115             }
 116             return thePolicyInfo.fifo.base_priority;
 117             break;
 118
 119         case POLICY_RR:
 120             count = POLICY_RR_INFO_COUNT;
 121             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_RR_INFO, (thread_info_t)&(thePolicyInfo.rr), &count);
 122             if ( (thePolicyInfo.rr.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
 123                 return thePolicyInfo.rr.depress_priority;
 124             }
 125             return thePolicyInfo.rr.base_priority;
 126             break;
 127     }
 128
 129     return 0;
 130 }
 131
 132 int JackMachThread::GetParams(jack_native_thread_t thread, UInt64* period, UInt64* computation, UInt64* constraint)
 133 {
 134     thread_time_constraint_policy_data_t theTCPolicy;
 135     mach_msg_type_number_t count = THREAD_TIME_CONSTRAINT_POLICY_COUNT;
 136     boolean_t get_default = false;
 137
 138     kern_return_t res = thread_policy_get(pthread_mach_thread_np(thread),
 139                                           THREAD_TIME_CONSTRAINT_POLICY,
 140                                           (thread_policy_t) & theTCPolicy,
 141                                           &count,
 142                                           &get_default);
 143     if (res == KERN_SUCCESS) {
 144     #ifdef MY_TARGET_OS_IPHONE
 145         *period = CAHostTimeBase::ConvertToNanos(theTCPolicy.period);
 146         *computation = CAHostTimeBase::ConvertToNanos(theTCPolicy.computation);
 147         *constraint = CAHostTimeBase::ConvertToNanos(theTCPolicy.constraint);
 148     #else
 149         *period = AudioConvertHostTimeToNanos(theTCPolicy.period);
 150         *computation = AudioConvertHostTimeToNanos(theTCPolicy.computation);
 151         *constraint = AudioConvertHostTimeToNanos(theTCPolicy.constraint);
 152     #endif
 153
 154         jack_log("JackMachThread::GetParams period = %ld computation = %ld constraint = %ld", long(*period / 1000.0f), long(*computation / 1000.0f), long(*constraint / 1000.0f));
 155         return 0;
 156     } else {
 157         return -1;
 158     }
 159 }
 160
 161 int JackMachThread::Kill()
 162 {
 163     if (fThread != (jack_native_thread_t)NULL)  { // If thread has been started
 164         jack_log("JackMachThread::Kill");
 165         mach_port_t machThread = pthread_mach_thread_np(fThread);
 166         int res = (thread_terminate(machThread) == KERN_SUCCESS) ? 0 : -1;
 167         fStatus = kIdle;
 168         fThread = (jack_native_thread_t)NULL;
 169         return res;
 170     } else {
 171         return -1;
 172     }
 173 }
 174
 175 int JackMachThread::AcquireRealTime()
 176 {
 177     jack_log("JackMachThread::AcquireRealTime fPeriod = %ld fComputation = %ld fConstraint = %ld",
 178              long(fPeriod / 1000), long(fComputation / 1000), long(fConstraint / 1000));
 179     return (fThread != (jack_native_thread_t)NULL) ? AcquireRealTimeImp(fThread, fPeriod, fComputation, fConstraint) : -1;
 180 }
 181
 182 int JackMachThread::AcquireSelfRealTime()
 183 {
 184     jack_log("JackMachThread::AcquireSelfRealTime fPeriod = %ld fComputation = %ld fConstraint = %ld",
 185              long(fPeriod / 1000), long(fComputation / 1000), long(fConstraint / 1000));
 186     return AcquireRealTimeImp(pthread_self(), fPeriod, fComputation, fConstraint);
 187 }
 188
 189 int JackMachThread::AcquireRealTime(int priority)
 190 {
 191     fPriority = priority;
 192     return AcquireRealTime();
 193 }
 194
 195 int JackMachThread::AcquireSelfRealTime(int priority)
 196 {
 197     fPriority = priority;
 198     return AcquireSelfRealTime();
 199 }
 200
 201 int JackMachThread::AcquireRealTimeImp(jack_native_thread_t thread, UInt64 period, UInt64 computation, UInt64 constraint)
 202 {
 203     SetThreadToPriority(thread, 96, true, period, computation, constraint);
 204     return 0;
 205 }
 206
 207 int JackMachThread::DropRealTime()
 208 {
 209     return (fThread != (jack_native_thread_t)NULL) ? DropRealTimeImp(fThread) : -1;
 210 }
 211
 212 int JackMachThread::DropSelfRealTime()
 213 {
 214     return DropRealTimeImp(pthread_self());
 215 }
 216
 217 int JackMachThread::DropRealTimeImp(jack_native_thread_t thread)
 218 {
 219     SetThreadToPriority(thread, 63, false, 0, 0, 0);
 220     return 0;
 221 }
 222
 223 void JackMachThread::SetParams(UInt64 period, UInt64 computation, UInt64 constraint)
 224 {
 225     fPeriod = period;
 226     fComputation = computation;
 227     fConstraint = constraint;
 228 }
 229
 230 } // end of namespace
 231