79 lines
1.6 KiB
C++
79 lines
1.6 KiB
C++
|
#ifndef THREAD_WORK_POOL_H
|
||
|
|
#define THREAD_WORK_POOL_H
|
||
|
|
|
||
|
|
#include "core/os/memory.h"
|
||
|
|
#include "core/os/semaphore.h"
|
||
|
|
#include <atomic>
|
||
|
|
#include <thread>
|
||
|
|
class ThreadWorkPool {
|
||
|
|
|
||
|
|
std::atomic<uint32_t> index;
|
||
|
|
|
||
|
|
struct BaseWork {
|
||
|
|
std::atomic<uint32_t> *index;
|
||
|
|
uint32_t max_elements;
|
||
|
|
virtual void work() = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class C, class M, class U>
|
||
|
|
struct Work : public BaseWork {
|
||
|
|
C *instance;
|
||
|
|
M method;
|
||
|
|
U userdata;
|
||
|
|
virtual void work() {
|
||
|
|
|
||
|
|
while (true) {
|
||
|
|
uint32_t work_index = index->fetch_add(1, std::memory_order_relaxed);
|
||
|
|
if (work_index >= max_elements) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
(instance->*method)(work_index, userdata);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
struct ThreadData {
|
||
|
|
std::thread *thread;
|
||
|
|
Semaphore start;
|
||
|
|
Semaphore completed;
|
||
|
|
std::atomic<bool> exit;
|
||
|
|
BaseWork *work;
|
||
|
|
};
|
||
|
|
|
||
|
|
ThreadData *threads = nullptr;
|
||
|
|
uint32_t thread_count = 0;
|
||
|
|
|
||
|
|
static void _thread_function(ThreadData *p_thread);
|
||
|
|
|
||
|
|
public:
|
||
|
|
template <class C, class M, class U>
|
||
|
|
void do_work(uint32_t p_elements, C *p_instance, M p_method, U p_userdata) {
|
||
|
|
|
||
|
|
ERR_FAIL_COND(!threads); //never initialized
|
||
|
|
|
||
|
|
index.store(0);
|
||
|
|
|
||
|
|
Work<C, M, U> *w = memnew((Work<C, M, U>));
|
||
|
|
w->instance = p_instance;
|
||
|
|
w->userdata = p_userdata;
|
||
|
|
w->method = p_method;
|
||
|
|
w->index = &index;
|
||
|
|
w->max_elements = p_elements;
|
||
|
|
|
||
|
|
for (uint32_t i = 0; i < thread_count; i++) {
|
||
|
|
threads[i].work = w;
|
||
|
|
threads[i].start.post();
|
||
|
|
}
|
||
|
|
for (uint32_t i = 0; i < thread_count; i++) {
|
||
|
|
threads[i].completed.wait();
|
||
|
|
threads[i].work = nullptr;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void init(int p_thread_count = -1);
|
||
|
|
void finish();
|
||
|
|
~ThreadWorkPool();
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // THREAD_POOL_H
|