macosx/JackMachThread.cpp

   1 /*
   2 Copyright (C) 2001 Paul Davis
   3 Copyright (C) 2004-2006 Grame
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 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 General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #include "JackMachThread.h"
  22 #include "JackError.h"
  23
  24 namespace Jack
  25 {
  26
  27 int JackMachThread::SetThreadToPriority(pthread_t thread, UInt32 inPriority, Boolean inIsFixed, UInt64 period, UInt64 computation, UInt64 constraint)
  28 {
  29     if (inPriority == 96) {
  30         // REAL-TIME / TIME-CONSTRAINT THREAD
  31         thread_time_constraint_policy_data_t    theTCPolicy;
  32
  33         theTCPolicy.period = AudioConvertNanosToHostTime(period);
  34         theTCPolicy.computation = AudioConvertNanosToHostTime(computation);
  35         theTCPolicy.constraint = AudioConvertNanosToHostTime(constraint);
  36         theTCPolicy.preemptible = true;
  37         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);
  38         JackLog("JackMachThread::thread_policy_set %ld\n", res);
  39         return (res == KERN_SUCCESS) ? 0 : -1;
  40     } else {
  41         // OTHER THREADS
  42         thread_extended_policy_data_t theFixedPolicy;
  43         thread_precedence_policy_data_t thePrecedencePolicy;
  44         SInt32 relativePriority;
  45
  46         // [1] SET FIXED / NOT FIXED
  47         theFixedPolicy.timeshare = !inIsFixed;
  48         thread_policy_set(pthread_mach_thread_np(thread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
  49
  50         // [2] SET PRECEDENCE
  51         // N.B.: We expect that if thread A created thread B, and the program wishes to change
  52         // the priority of thread B, then the call to change the priority of thread B must be
  53         // made by thread A.
  54         // This assumption allows us to use pthread_self() to correctly calculate the priority
  55         // of the feeder thread (since precedency policy's importance is relative to the
  56         // spawning thread's priority.)
  57         relativePriority = inPriority - GetThreadSetPriority(pthread_self());
  58
  59         thePrecedencePolicy.importance = relativePriority;
  60         kern_return_t res = thread_policy_set(pthread_mach_thread_np(thread), THREAD_PRECEDENCE_POLICY, (thread_policy_t) & thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
  61         JackLog("JackMachThread::thread_policy_set %ld\n", res);
  62         return (res == KERN_SUCCESS) ? 0 : -1;
  63     }
  64 }
  65
  66 // returns the thread's priority as it was last set by the API
  67 UInt32 JackMachThread::GetThreadSetPriority(pthread_t thread)
  68 {
  69     return GetThreadPriority(thread, THREAD_SET_PRIORITY);
  70 }
  71
  72 // returns the thread's priority as it was last scheduled by the Kernel
  73 UInt32 JackMachThread::GetThreadScheduledPriority(pthread_t thread)
  74 {
  75     return GetThreadPriority(thread, THREAD_SCHEDULED_PRIORITY);
  76 }
  77
  78 UInt32 JackMachThread::GetThreadPriority(pthread_t thread, int inWhichPriority)
  79 {
  80     thread_basic_info_data_t threadInfo;
  81     policy_info_data_t thePolicyInfo;
  82     unsigned int count;
  83
  84     // get basic info
  85     count = THREAD_BASIC_INFO_COUNT;
  86     thread_info(pthread_mach_thread_np(thread), THREAD_BASIC_INFO, (thread_info_t)&threadInfo, &count);
  87
  88     switch (threadInfo.policy) {
  89         case POLICY_TIMESHARE:
  90             count = POLICY_TIMESHARE_INFO_COUNT;
  91             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&(thePolicyInfo.ts), &count);
  92             if (inWhichPriority == THREAD_SCHEDULED_PRIORITY) {
  93                 return thePolicyInfo.ts.cur_priority;
  94             } else {
  95                 return thePolicyInfo.ts.base_priority;
  96             }
  97             break;
  98
  99         case POLICY_FIFO:
 100             count = POLICY_FIFO_INFO_COUNT;
 101             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_FIFO_INFO, (thread_info_t)&(thePolicyInfo.fifo), &count);
 102             if ( (thePolicyInfo.fifo.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
 103                 return thePolicyInfo.fifo.depress_priority;
 104             }
 105             return thePolicyInfo.fifo.base_priority;
 106             break;
 107
 108         case POLICY_RR:
 109             count = POLICY_RR_INFO_COUNT;
 110             thread_info(pthread_mach_thread_np(thread), THREAD_SCHED_RR_INFO, (thread_info_t)&(thePolicyInfo.rr), &count);
 111             if ( (thePolicyInfo.rr.depressed) && (inWhichPriority == THREAD_SCHEDULED_PRIORITY) ) {
 112                 return thePolicyInfo.rr.depress_priority;
 113             }
 114             return thePolicyInfo.rr.base_priority;
 115             break;
 116     }
 117
 118     return 0;
 119 }
 120
 121 int JackMachThread::GetParams(UInt64* period, UInt64* computation, UInt64* constraint)
 122 {
 123     thread_time_constraint_policy_data_t theTCPolicy;
 124     mach_msg_type_number_t count = THREAD_TIME_CONSTRAINT_POLICY_COUNT;
 125     boolean_t get_default = false;
 126
 127     kern_return_t res = thread_policy_get(pthread_mach_thread_np(pthread_self()),
 128                                           THREAD_TIME_CONSTRAINT_POLICY,
 129                                           (thread_policy_t) & theTCPolicy,
 130                                           &count,
 131                                           &get_default);
 132     if (res == KERN_SUCCESS) {
 133         *period = AudioConvertHostTimeToNanos(theTCPolicy.period);
 134         *computation = AudioConvertHostTimeToNanos(theTCPolicy.computation);
 135         *constraint = AudioConvertHostTimeToNanos(theTCPolicy.constraint);
 136         JackLog("JackMachThread::GetParams period = %ld computation = %ld constraint = %ld\n", long(*period / 1000.0f), long(*computation / 1000.0f), long(*constraint / 1000.0f));
 137         return 0;
 138     } else {
 139         return -1;
 140     }
 141 }
 142
 143 int JackMachThread::Kill()
 144 {
 145     // pthread_cancel still not yet implemented in Darwin (TO CHECK ON TIGER)
 146
 147     if (fThread) { // If thread has been started
 148         mach_port_t machThread = pthread_mach_thread_np(fThread);
 149         return (thread_terminate(machThread) == KERN_SUCCESS) ? 0 : -1;
 150     } else {
 151         return -1;
 152     }
 153 }
 154
 155 int JackMachThread::AcquireRealTime()
 156 {
 157     JackLog("JackMachThread::AcquireRealTime fPeriod = %ld fComputation = %ld fConstraint = %ld\n",
 158             long(fPeriod / 1000), long(fComputation / 1000), long(fConstraint / 1000));
 159
 160         return (fThread) ? AcquireRealTimeImp(fThread, fPeriod, fComputation, fConstraint) : -1;
 161 }
 162
 163 int JackMachThread::AcquireRealTimeImp(pthread_t thread, UInt64 period, UInt64 computation, UInt64 constraint)
 164 {
 165         SetThreadToPriority(thread, 96, true, period, computation, constraint);
 166         UInt64 int_period;
 167         UInt64 int_computation;
 168         UInt64 int_constraint;
 169         GetParams(&int_period, &int_computation, &int_constraint);
 170         return 0;
 171 }
 172
 173 int JackMachThread::DropRealTime()
 174 {
 175     return (fThread) ? DropRealTimeImp(fThread) : -1;
 176 }
 177
 178 int JackMachThread::DropRealTimeImp(pthread_t thread)
 179 {
 180         SetThreadToPriority(thread, 63, false, 0, 0, 0);
 181         return 0;
 182 }
 183
 184 void JackMachThread::SetParams(UInt64 period, UInt64 computation, UInt64 constraint)
 185 {
 186     fPeriod = period;
 187     fComputation = computation;
 188     fConstraint = constraint;
 189 }
 190
 191 } // end of namespace
 192