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worker.cpp
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worker.cpp
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#include "worker.h"
#include "scheduler.h"
#include "thread.h"
#include <functional>
#include <mutex>
#include <pthread.h>
namespace RCo {
thread_local RWorker *current_worker;
thread_local workBase *current_work;
RWorker::RWorker(Core *core, bool neverDieWorker, int config)
: core(core)
, neverDieWorker(neverDieWorker)
, config(config) {
this->thread = new RThread(core, std::bind(&RWorker::threadFunction, this));
}
RWorker::~RWorker() {
delete this->thread;
}
bool RWorker::appendWork(workBase *work) noexcept {
std::lock_guard worksLockGuard(this->worksLock);
[[unlikely]] if (shutdown) {
return false;
}
newWorkTag--;
this->works.push_back(work);
return true;
}
bool RWorker::isBusy() noexcept {
if (this->shutdown) {
return true;
}
return this->working;
}
bool RWorker::tagNewWorkIsOnTheWay() noexcept {
std::lock_guard worksLockGuard(this->worksLock);
[[unlikely]] if (this->shutdown) {
return false;
}
newWorkTag++;
return true;
}
void RWorker::threadFunction() noexcept {
current_worker = this;
int noTaskTryTime = 0;
while (true) {
// TODO: better schedule and schedule between thread
// pick a work to resume
this->worksLock.lock();
if (!this->works.empty()) {
noTaskTryTime = 0;
auto work = this->works.front();
this->works.pop_front();
this->worksLock.unlock();
this->working = true;
current_work = work;
work->resume();
} else {
this->worksLock.unlock();
this->working = false;
noTaskTryTime++;
if (num_pending_task == 0 && noTaskTryTime > this->core->scheduler->config.MaxNoTaskTryTime && !neverDieWorker) {
// then this thread should stop to release system resource
// refuse to add any work to this worker
this->worksLock.lock();
if (!this->works.empty() ||
this->newWorkTag > 0) { // new work or new work on the way, then stop shutdown
this->worksLock.unlock();
continue;
}
// starts to shutdown
shutdown = true;
this->worksLock.unlock();
this->core->removeWorker(this);
pthread_exit(nullptr); // this worker no longer exists
return;
}
}
sched_yield(); // pass the cpu to other workers(threads) on this core
}
}
} // namespace RCo