eventimpl.cpp

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/* SPDX-License-Identifier: MIT */
#include "ajabase/system/linux/eventimpl.h"
#include "ajabase/system/debug.h"
#include <errno.h>
 
#define MAX_EVENTS 64
 
using std::string;
 
// event implementation class (linux)
AJAEventImpl::AJAEventImpl(bool manualReset, const std::string& name)
    : mManualReset(manualReset)
{
    AJA_UNUSED(name);
    pthread_mutex_init(&mMutex, NULL);
    pthread_cond_init(&mCondVar, NULL);
    Clear();
}
 
 
AJAEventImpl::~AJAEventImpl(void)
{
    pthread_cond_destroy(&mCondVar);
    pthread_mutex_destroy(&mMutex);
}
 
 
AJAStatus 
AJAEventImpl::Signal(void)
{
    // check for open
    int theError;
 
    pthread_mutex_lock(&mMutex);
    mSignaled = true;
    theError  = pthread_cond_broadcast(&mCondVar);
    pthread_mutex_unlock(&mMutex);
 
    if (theError)
    {
        AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAEventImpl::Signal() returns error %08x", theError);
        return AJA_STATUS_FAIL;
    }
    return AJA_STATUS_SUCCESS;
}
 
 
AJAStatus
AJAEventImpl::Clear(void)
{
    // check for open
    mSignaled = false;
    return AJA_STATUS_SUCCESS;
}
 
 
AJAStatus
AJAEventImpl::SetState(bool signaled)
{
    AJAStatus status;
 
    if (signaled)
    {
        status = Signal();
    }
    else
    {
        status = Clear();
    }
 
    return status;
}
 
 
AJAStatus
AJAEventImpl::GetState(bool* pSignaled)
{
    AJA_UNUSED(pSignaled);
 
    // wait with timeout 0 returns immediately
    return WaitForSignal(0);
}
 
 
AJAStatus
AJAEventImpl::SetManualReset(bool manualReset)
{
    mManualReset = manualReset;
    return AJA_STATUS_SUCCESS;
}
 
 
AJAStatus
AJAEventImpl::GetManualReset(bool* pManualReset)
{
    if (pManualReset)
    {
        *pManualReset = mManualReset;
        return AJA_STATUS_SUCCESS;
    }
    else
        return AJA_STATUS_FAIL;
}
 
 
AJAStatus
AJAEventImpl::WaitForSignal(uint32_t timeout)
{
    static const long long  NS_PER_SEC = 1000000000ULL;
 
    // check for open
    int64_t nanos = timeout;
    nanos *= 1000000;
 
    struct timespec ts;
    int32_t         result;
    AJAStatus       status = AJA_STATUS_SUCCESS;
    
    clock_gettime(CLOCK_REALTIME, &ts);
 
    nanos     += ts.tv_nsec;
    ts.tv_sec += (nanos / NS_PER_SEC);
    ts.tv_nsec = (nanos % NS_PER_SEC);
 
    pthread_mutex_lock(&mMutex);
 
    if (false == mSignaled)
    {
        result = pthread_cond_timedwait(&mCondVar, &mMutex, &ts);
 
        if (0 != result)
        {
            if (result == ETIMEDOUT) 
            {
                AJA_REPORT(0, AJA_DebugSeverity_Info,
                    "AJAEventImpl::WaitForSignal() timeout", result);
                status = AJA_STATUS_TIMEOUT;
            }
            else
            {
                AJA_REPORT(0, AJA_DebugSeverity_Error,
                    "AJAEventImpl::WaitForSignal() "
                    "pthread_cond_timedwait returns error %08x", result);
                status = AJA_STATUS_FAIL;
            }
        }
    }
    if (!mManualReset)
    {
        mSignaled = false;
    }
    pthread_mutex_unlock(&mMutex);
    return (status);
}
 
 
AJAStatus
AJAEventImpl::GetEventObject(uint64_t* pEventObject)
{
    AJA_UNUSED(pEventObject);
 
    return AJA_STATUS_SUCCESS;
}
 
 
/*
AJAStatus
AJAWaitForEvents(AJAEventPtr* pEventList, uint32_t numEvents, bool all, uint32_t timeout)
{
    
    HANDLE eventArray[MAX_EVENTS];
    
    if (pEventList == NULL)
    {
        AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAWaitForEvents  event list is NULL");
        return AJA_STATUS_INITIALIZE;
    }
 
    if (numEvents == 0)
    {
        AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAWaitForEvents  event list is empty");
        return AJA_STATUS_RANGE;
    }
 
    if (numEvents > MAX_EVENTS)
    {
        AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAWaitForEvents  event list larger that MAX_EVENTS");
        return AJA_STATUS_RANGE;
    }
 
    uint32_t i;
 
    // build the array of handles from the AJAEvent(s)
    for (i = 0; i < numEvents; i++)
    {
        AJAEventPtr eventPtr = pEventList[i];
        AJA_ASSERT(eventPtr->mImplPtr->mEvent != NULL);
        if(eventPtr->mImplPtr->mEvent == NULL)
        {
            AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAWaitForEvents  event not initialized");
            return AJA_STATUS_INITIALIZE;
        }
        eventArray[i] = eventPtr->mImplPtr->mEvent;
    }
 
    // check for infinite timeout
    if (timeout == 0xffffffff)
    {
        timeout = INFINITE;
    }
 
    // wait for event(s) to be signaled
    DWORD retCode = WaitForMultipleObjects(numEvents, eventArray, all, (DWORD)timeout);
 
    // an event was signaled
    if ((retCode >= WAIT_OBJECT_0) && (retCode < (WAIT_OBJECT_0 + numEvents)))
    {
        return AJA_STATUS_SUCCESS;
    }
    // the wait timed out
    else if (retCode == WAIT_TIMEOUT)
    {
        return AJA_STATUS_TIMEOUT;
    }
 
    // some type of error occurred
    AJA_REPORT(0, AJA_DebugSeverity_Error, "AJAEvent()::WaitForEvents WaitForMultipleObjects() returns error %08x", retCode);
 
    return AJA_STATUS_FAIL;
}
*/