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tpool.cc
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tpool.cc
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#include "tpool.hh"
#include <chrono>
//#include <iostream>
#define POLLTIME 1000
//one millisec to start
tpool::tpool() {
queue = std::list<std::function<void(void)>>();
continueWork = true;
currentThreads = 0;
midTask = 0;
}
tpool::~tpool() {
continueWork = false;
while (currentThreads) {
if (!inProgress.try_acquire()) {
//there are threads working or waiting, but no more work to do
queue.push_front((std::function<void(void)>)([](){return;}));
//push empty func to prompt worker thread to check continueWork (will be popped)
inProgress.release();
} else {
//there is still work to do (empty or real)
inProgress.release(); //don't want to actually take anything
}
usleep(POLLTIME); //TODO rework this to use blocking threads instead of polling
}
}
//cycles, blocking if there is not work to do, and on the completion of a job, check if it should terminate
void tpool::poolWork() {
currentThreads++;
while (continueWork) {
inProgress.acquire(); //will block until there is work to do
// std::cerr << midTask << std::endl;
midTask++;
listAccess.lock(); //ensure no two threads pop the same thing (not sure if pop is threadsafe)
std::function<void(void)> func = queue.front();
queue.pop_front();
listAccess.unlock();
func(); //do the work
midTask--;
}
currentThreads--;
}
void tpool::enqueue(std::function<void(void)> toAdd) {
listAccess.lock();
queue.push_front(toAdd); //add the work
listAccess.unlock();
inProgress.release(); //tell the threads there is work to do
}
//TODO very gross, rework with blocking instead of polling (certainly avoid 2 polling cycles)
void tpool::waitUntilEmpty() {
while (inProgress.try_acquire()) {
//there was something there
inProgress.release();
usleep(POLLTIME);
}
//now there is are no tasks left to do, wait until the current tasks are finished
while (midTask)
usleep(POLLTIME);
}