fsfw/osal/linux/FixedTimeslotTask.cpp

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#include "../../serviceinterface/ServiceInterfaceStream.h"
#include "../../osal/linux/FixedTimeslotTask.h"
#include <limits.h>
uint32_t FixedTimeslotTask::deadlineMissedCount = 0;
const size_t PeriodicTaskIF::MINIMUM_STACK_SIZE = PTHREAD_STACK_MIN;
FixedTimeslotTask::FixedTimeslotTask(const char* name_, int priority_,
size_t stackSize_, uint32_t periodMs_):
PosixThread(name_,priority_,stackSize_),pst(periodMs_),started(false) {
}
FixedTimeslotTask::~FixedTimeslotTask() {
}
void* FixedTimeslotTask::taskEntryPoint(void* arg) {
//The argument is re-interpreted as PollingTask.
FixedTimeslotTask *originalTask(reinterpret_cast<FixedTimeslotTask*>(arg));
//The task's functionality is called.
originalTask->taskFunctionality();
return nullptr;
}
ReturnValue_t FixedTimeslotTask::startTask() {
started = true;
createTask(&taskEntryPoint,this);
return HasReturnvaluesIF::RETURN_OK;
}
ReturnValue_t FixedTimeslotTask::sleepFor(uint32_t ms) {
return PosixThread::sleep((uint64_t)ms*1000000);
}
uint32_t FixedTimeslotTask::getPeriodMs() const {
return pst.getLengthMs();
}
ReturnValue_t FixedTimeslotTask::addSlot(object_id_t componentId,
uint32_t slotTimeMs, int8_t executionStep) {
if (objectManager->get<ExecutableObjectIF>(componentId) != nullptr) {
pst.addSlot(componentId, slotTimeMs, executionStep, this);
return HasReturnvaluesIF::RETURN_OK;
}
sif::error << "Component " << std::hex << componentId <<
" not found, not adding it to pst" << std::dec << std::endl;
return HasReturnvaluesIF::RETURN_FAILED;
}
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ReturnValue_t FixedTimeslotTask::checkAndInitializeSequence() const {
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return pst.checkSequence();
}
void FixedTimeslotTask::taskFunctionality() {
//Like FreeRTOS pthreads are running as soon as they are created
if (!started) {
suspend();
}
//The start time for the first entry is read.
uint64_t lastWakeTime = getCurrentMonotonicTimeMs();
uint64_t interval = pst.getIntervalToNextSlotMs();
//The task's "infinite" inner loop is entered.
while (1) {
if (pst.slotFollowsImmediately()) {
//Do nothing
} else {
//The interval for the next polling slot is selected.
interval = this->pst.getIntervalToPreviousSlotMs();
//The period is checked and restarted with the new interval.
//If the deadline was missed, the deadlineMissedFunc is called.
if(!PosixThread::delayUntil(&lastWakeTime,interval)) {
//No time left on timer -> we missed the deadline
missedDeadlineCounter();
}
}
//The device handler for this slot is executed and the next one is chosen.
this->pst.executeAndAdvance();
}
}
void FixedTimeslotTask::missedDeadlineCounter() {
FixedTimeslotTask::deadlineMissedCount++;
if (FixedTimeslotTask::deadlineMissedCount % 10 == 0) {
sif::error << "PST missed " << FixedTimeslotTask::deadlineMissedCount
<< " deadlines." << std::endl;
}
}