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/*
Copyright: © Copyright 2002 Apple Computer, Inc. All rights
reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to
you by Apple Computer, Inc. ("Apple") in
consideration of your agreement to the
following terms, and your use, installation,
modification or redistribution of this Apple
software constitutes acceptance of these
terms. If you do not agree with these terms,
please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by
the following terms, and subject to these
terms, Apple grants you a personal,
non-exclusive license, under AppleÕs
copyrights in this original Apple software
(the "Apple Software"), to use, reproduce,
modify and redistribute the Apple Software,
with or without modifications, in source
and/or binary forms; provided that if you
redistribute the Apple Software in its
entirety and without modifications, you must
retain this notice and the following text and
disclaimers in all such redistributions of the
Apple Software. Neither the name, trademarks,
service marks or logos of Apple Computer,
Inc. may be used to endorse or promote
products derived from the Apple Software
without specific prior written permission from
Apple. Except as expressly stated in this
notice, no other rights or licenses, express
or implied, are granted by Apple herein,
including but not limited to any patent rights
that may be infringed by your derivative works
or by other works in which the Apple Software
may be incorporated.
The Apple Software is provided by Apple on an
"AS IS" basis. APPLE MAKES NO WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT
LIMITATION THE IMPLIED WARRANTIES OF
NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE
SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
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"
#import <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h>
#define THREAD_SET_PRIORITY 0
#define THREAD_SCHEDULED_PRIORITY 1
#include <mach/mach_error.h>
#include <mach/thread_policy.h>
#include <mach/thread_act.h>
#include <CoreAudio/HostTime.h>
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__ */
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