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#include "threadpool.h"
#include "arena_list.h"
#include "array.h"
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdatomic.h>
#define MAX_FUTURES 2048
typedef struct Thread {
pthread_t pthread;
size_t index;
} Thread;
typedef struct ThreadPool {
/* TODO: benötigte Attribute hinzufügen */
size_t size;
Thread *threads;
Node arena [MAX_FUTURES];
ArenaList al;
} ThreadPool;
ThreadPool threadPool;
/* TODO: interne Hilfsfunktionen hinzufügen */
void * poolWorkerFunc(void * v_index) {
size_t index = * (size_t *) v_index;
printf("Thread %zu started \n", index);
return NULL;
}
int tpInit(size_t size) {
threadPool.size = size;
arrayInit(threadPool.threads);
alInit(threadPool.arena, MAX_FUTURES);
for (size_t i = 0; i < size; ++i) {
arrayPush(threadPool.threads);
int status;
threadPool.threads[i].index = i;
if ((status = pthread_create(&threadPool.threads[i].pthread, NULL,
poolWorkerFunc, &threadPool.threads[i].index)) < 0) {
return status;
}
}
return 0;
}
void tpRelease(void) {
for (size_t i = 0; i < threadPool.size; ++i) {
if (pthread_cancel(threadPool.threads[i].pthread) != 0) {
fprintf(stderr, "The thread %zu had already exited. \n", threadPool.threads[i].index);
}
}
for (size_t i = 0; i < threadPool.size; ++i) {
int status;
if ((status = pthread_join(threadPool.threads[i].pthread, NULL)) != 0) {
perror("An error occured while joining the threads");
exit(status);
}
}
}
void tpAsync(Future *future) {
alPush(&threadPool.al, (void *) future);
char expected = FUT_WAITING;
if(!atomic_compare_exchange_strong(&future->status, &expected, FUT_IN_PROGRESS )) {
perror("The future has been scheduled before");
exit(-1);
}
future->fn(future);
expected = FUT_IN_PROGRESS;
if(!atomic_compare_exchange_strong(&future->status, &expected, FUT_IN_PROGRESS)) {
perror("The future got marked as done by another thread");
exit(-1);
}
}
void tpAwait(Future *future) {
if(atomic_load(&future->status) == FUT_DONE) {
alRemoveElem(&threadPool.al, (void *) future);
return;
}
}
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