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// thread_pool.cpp
#define WORKER_TASK_PROC(name) isize name(void *data)
typedef WORKER_TASK_PROC(WorkerTaskProc);
struct WorkerTask {
WorkerTask * next;
WorkerTaskProc *do_work;
void * data;
};
struct ThreadPool {
gbAllocator allocator;
BlockingMutex mutex;
Condition task_cond;
Slice<Thread> threads;
WorkerTask *task_queue;
std::atomic<isize> ready;
std::atomic<bool> stop;
};
gb_internal THREAD_PROC(thread_pool_thread_proc);
gb_internal void thread_pool_init(ThreadPool *pool, gbAllocator const &a, isize thread_count, char const *worker_name) {
pool->allocator = a;
pool->stop = false;
mutex_init(&pool->mutex);
condition_init(&pool->task_cond);
slice_init(&pool->threads, a, thread_count);
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_init(t);
}
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_start(t, thread_pool_thread_proc, pool);
}
}
gb_internal void thread_pool_destroy(ThreadPool *pool) {
mutex_lock(&pool->mutex);
pool->stop = true;
condition_broadcast(&pool->task_cond);
mutex_unlock(&pool->mutex);
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_join(t);
}
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_destroy(t);
}
gb_free(pool->allocator, pool->threads.data);
mutex_destroy(&pool->mutex);
condition_destroy(&pool->task_cond);
}
gb_internal bool thread_pool_queue_empty(ThreadPool *pool) {
return pool->task_queue == nullptr;
}
gb_internal WorkerTask *thread_pool_queue_pop(ThreadPool *pool) {
GB_ASSERT(pool->task_queue != nullptr);
WorkerTask *task = pool->task_queue;
pool->task_queue = task->next;
return task;
}
gb_internal void thread_pool_queue_push(ThreadPool *pool, WorkerTask *task) {
GB_ASSERT(task != nullptr);
task->next = pool->task_queue;
pool->task_queue = task;
}
gb_internal bool thread_pool_add_task(ThreadPool *pool, WorkerTaskProc *proc, void *data) {
GB_ASSERT(proc != nullptr);
mutex_lock(&pool->mutex);
WorkerTask *task = gb_alloc_item(permanent_allocator(), WorkerTask);
if (task == nullptr) {
mutex_unlock(&pool->mutex);
GB_PANIC("Out of memory");
return false;
}
task->do_work = proc;
task->data = data;
thread_pool_queue_push(pool, task);
GB_ASSERT(pool->ready >= 0);
pool->ready++;
condition_broadcast(&pool->task_cond);
mutex_unlock(&pool->mutex);
return true;
}
gb_internal void thread_pool_do_task(WorkerTask *task) {
task->do_work(task->data);
}
gb_internal void thread_pool_wait(ThreadPool *pool) {
if (pool->threads.count == 0) {
while (!thread_pool_queue_empty(pool)) {
thread_pool_do_task(thread_pool_queue_pop(pool));
--pool->ready;
}
GB_ASSERT(pool->ready == 0);
return;
}
for (;;) {
mutex_lock(&pool->mutex);
while (!pool->stop && pool->ready > 0 && thread_pool_queue_empty(pool)) {
condition_wait(&pool->task_cond, &pool->mutex);
}
if ((pool->stop || pool->ready == 0) && thread_pool_queue_empty(pool)) {
mutex_unlock(&pool->mutex);
return;
}
WorkerTask *task = thread_pool_queue_pop(pool);
mutex_unlock(&pool->mutex);
thread_pool_do_task(task);
if (--pool->ready == 0) {
mutex_lock(&pool->mutex);
condition_broadcast(&pool->task_cond);
mutex_unlock(&pool->mutex);
}
}
}
gb_internal THREAD_PROC(thread_pool_thread_proc) {
ThreadPool *pool = cast(ThreadPool *)thread->user_data;
for (;;) {
mutex_lock(&pool->mutex);
while (!pool->stop && thread_pool_queue_empty(pool)) {
condition_wait(&pool->task_cond, &pool->mutex);
}
if (pool->stop && thread_pool_queue_empty(pool)) {
mutex_unlock(&pool->mutex);
return 0;
}
WorkerTask *task = thread_pool_queue_pop(pool);
mutex_unlock(&pool->mutex);
thread_pool_do_task(task);
if (--pool->ready == 0) {
mutex_lock(&pool->mutex);
condition_broadcast(&pool->task_cond);
mutex_unlock(&pool->mutex);
}
}
}
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