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#include <iostream>
#include <chrono>
#include <cassert>
#include "scheduler.h"
void Scheduler::workerEntry(bool verbose) {
while (true) {
Job *job = nullptr;
{
lock_guard commMutGuard(commMut);
if (jobs.size() > 0) {
job = jobs.front();
jobs.pop();
}
}
if (job) {
if (verbose) {
cout << "SCHED(" << this_thread::get_id() << ") running job" << endl;
}
job->callback();
delete job;
if (verbose) {
cout << "SCHED(" << this_thread::get_id() << ") finished job" << endl;
}
} else if (finishFlag) {
if (verbose) {
cout << "SCHED(" << this_thread::get_id() << ") spotted finishFlag" << endl;
}
break;
} else {
if (verbose) {
cout << "SCHED(" << this_thread::get_id() << ") no job, waiting" << endl;
}
this_thread::sleep_for(chrono::milliseconds(100));
}
}
}
Scheduler::Scheduler(bool verbose, int nthreads)
: verbose(verbose), nthreads(nthreads) {
assert(nthreads > 0);
workers.reserve(nthreads);
for (int i = 0; i < nthreads; i++) {
workers.emplace_back([this]() { workerEntry(this->verbose); });
}
if (verbose) {
cout << "SCHED " << nthreads << " workers spawned" << endl;
}
}
Scheduler::~Scheduler() {
finish();
}
void Scheduler::submit(const function<void()> &func) {
Job *job = new Job(func);
lock_guard commMutGuard(commMut);
jobs.push(job);
}
void Scheduler::finish() {
if (hasJoined) return;
if (verbose) {
cout << "SCHED finish()" << endl;
}
{
lock_guard commMutGuard(commMut);
finishFlag = true;
}
for (int i = 0; i < nthreads; i++) {
if (verbose) {
cout << "SCHED Joining worker " << i << "..." << endl;
}
workers[i].join();
}
if (verbose) {
cout << "SCHED All workers joined" << endl;
}
hasJoined = true;
}
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