ThreadUtilities.cpp

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//
//  ThreadUtilities.cpp -- cross-platform Thread Utilities
//  See the copyright notice and acknowledgment of authors in the file COPYRIGHT
//

#include "ThreadUtilities.h"
#include "CGestalt.h"

using namespace csl;

#ifdef USE_JTHREADS

// Thread is now concrete

CThread * CThread::MakeThread() { 
    return new CThread(); 
}

int CThread::createThread(VoidFcnPtr * func, void * args) {
    (*func)(args);              // call my function
    return 0;
}

//int CThread::createRealtimeThread(VOIDFCNPTR * func, void * args) {
//  mFunc = * func;
//  mArgs = args;
//  run();
//  return 0;
//}

void CThread::run() {
    logMsg("Start thread");
    (*mFunc)(mArgs);                // call my function
}

#else

// This CThread uses pthreads

CThread * CThread::MakeThread() { 
    return new ThreadPthread(); 
}

Synch *Synch::MakeSynch() { return new SynchPthread(); }

// ~~~~~ SyncPthread Implementation ~~~~~

// Constructor

SynchPthread::SynchPthread() {
    pthread_mutex_init(& mMutex, NULL);
    pthread_cond_init(& mCond, NULL);
}

SynchPthread::~SynchPthread() {
    pthread_mutex_destroy(&mMutex);
    pthread_cond_destroy(&mCond);
}

// The following functions are just wrappers around the pthreads respective commands.

int SynchPthread::lock() { return pthread_mutex_lock(&mMutex); }

int SynchPthread::unlock() { return pthread_mutex_unlock(&mMutex); }

int SynchPthread::condWait() { return pthread_cond_wait(&mCond, &mMutex); }

int SynchPthread::condSignal() { return pthread_cond_signal(&mCond); }

// ~~~~~ ThreadPthread Implementation ~~~~~

// Constructor and destructor for windows and other systems.

#ifdef CSL_WINDOWS

ThreadPthread::ThreadPthread() : CThread () /*, mThread(NULL)*/ { 
    pthread_attr_init(&mAttributes);
}

ThreadPthread::~ThreadPthread() {
    pthread_attr_destroy(&mAttributes);
//  if (mThread)
//      pthread_cancel(mThread);
}

#else

ThreadPthread::ThreadPthread() : CThread(), mThread(NULL) { 
    pthread_attr_init(&mAttributes);
}

ThreadPthread::~ThreadPthread() {
    pthread_attr_destroy(&mAttributes);
    if (mThread)
        pthread_cancel(mThread);
}

#endif

int ThreadPthread::createThread(VoidFcnPtr * func, void * args) {
    pthread_attr_setdetachstate(&mAttributes, PTHREAD_CREATE_DETACHED);
    pthread_attr_setscope(&mAttributes, PTHREAD_SCOPE_SYSTEM);
    return pthread_create(&mThread, &mAttributes, func, args);
}

#ifdef CSL_MACOSX_OLD_WAY

// Most of the code in these two functions is taken from Apple PlayAudioFile example

#include <mach/mach.h>      // used for setting policy of thread

unsigned GetThreadBasePriority (pthread_t inThread) {
    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, (integer_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, (integer_t*)&(thePolicyInfo.ts), &count);
            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, (integer_t*)&(thePolicyInfo.fifo), &count);
            if (thePolicyInfo.fifo.depressed) {
                return thePolicyInfo.fifo.depress_priority;
            } else {
                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, (integer_t*)&(thePolicyInfo.rr), &count);
            if (thePolicyInfo.rr.depressed)
                return thePolicyInfo.rr.depress_priority;
            else
                return thePolicyInfo.rr.base_priority;
            break;
    }
    return 0;
}

int ThreadPthread::createRealtimeThread(VoidFcnPtr * func, void* args) {
                // first create a thread
    int value = createThread(func, args);
    int result;
    int threadPriority = 62; // the number in Apple's example code

                // bump up the priority and make it fixed priority
                // code taken from Apple PlayAudioFile example
    thread_extended_policy_data_t theFixedPolicy;
    thread_precedence_policy_data_t thePrecedencePolicy;
    int relativePriority;
                // make thread fixed
    theFixedPolicy.timeshare = false;   // set to true for a non-fixed thread
    result = thread_policy_set (pthread_mach_thread_np(mThread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
                // set priority
                // precedency policy's "importance" value is relative to spawning thread's priority
    relativePriority = threadPriority - GetThreadBasePriority (pthread_self());
    thePrecedencePolicy.importance = relativePriority;
    result = thread_policy_set (pthread_mach_thread_np(mThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
    return value;
}

#else

//int ThreadPthread::createRealtimeThread(VOIDFCNPTR * func, void* args) {
//  return createThread(func, args);
//}

#endif

#endif