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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* pThreadUtilities.h */ #ifndef __PTHREADUTILITIES_H__ #define __PTHREADUTILITIES_H__ #import "pthread.h" #define THREAD_SET_PRIORITY 0 #define THREAD_SCHEDULED_PRIORITY 1 #include #include #include #include #import #if defined(MAC_OS_X_VERSION_10_7) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7 #import #else #import #endif static inline UInt32 _getThreadPriority (pthread_t inThread, 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 (inThread), 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 (inThread), 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 (inThread), 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 (inThread), 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; } // returns the thread's priority as it was last set by the API static inline UInt32 getThreadSetPriority (pthread_t inThread) { return _getThreadPriority (inThread, THREAD_SET_PRIORITY); } // returns the thread's priority as it was last scheduled by the Kernel static inline UInt32 getThreadScheduledPriority (pthread_t inThread) { return _getThreadPriority (inThread, THREAD_SCHEDULED_PRIORITY); } static inline void setThreadToPriority (pthread_t inThread, UInt32 inPriority, Boolean inIsFixed, UInt64 inHALIOProcCycleDurationInNanoseconds) { if (inPriority == 96) { // REAL-TIME / TIME-CONSTRAINT THREAD thread_time_constraint_policy_data_t theTCPolicy; UInt64 theComputeQuanta; UInt64 thePeriod; UInt64 thePeriodNanos; thePeriodNanos = inHALIOProcCycleDurationInNanoseconds; theComputeQuanta = AudioConvertNanosToHostTime ( thePeriodNanos * 0.15 ); thePeriod = AudioConvertNanosToHostTime (thePeriodNanos); theTCPolicy.period = thePeriod; theTCPolicy.computation = theComputeQuanta; theTCPolicy.constraint = thePeriod; theTCPolicy.preemptible = true; thread_policy_set (pthread_mach_thread_np (inThread), THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t)&theTCPolicy, THREAD_TIME_CONSTRAINT_POLICY_COUNT); } 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 (inThread), 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; thread_policy_set (pthread_mach_thread_np (inThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT); } } #endif /* __PTHREADUTILITIES_H__ */