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// worker_queue.cpp
#define WORKER_TASK_PROC(name) isize name(void *data)
typedef WORKER_TASK_PROC(WorkerTaskProc);
struct WorkerTask {
WorkerTaskProc *do_work;
void *data;
};
struct ThreadPool {
gbMutex task_mutex;
gbMutex mutex;
gbSemaphore semaphore;
gbAtomic32 processing_work_count;
bool is_running;
Array<WorkerTask> tasks;
Array<gbThread> threads;
gbAllocator original_allocator;
char worker_prefix[10];
i32 worker_prefix_len;
};
GB_ALLOCATOR_PROC(thread_pool_allocator_proc) {
ThreadPool *pool = cast(ThreadPool *)allocator_data;
return pool->original_allocator.proc(pool->original_allocator.data, type, size, 256, old_memory, old_size, flags);
}
gbAllocator thread_pool_allocator(ThreadPool *pool) {
gbAllocator a = {thread_pool_allocator_proc, pool};
return a;
}
void thread_pool_init(ThreadPool *pool, gbAllocator const &a, isize thread_count, char const *worker_prefix = nullptr);
void thread_pool_destroy(ThreadPool *pool);
void thread_pool_start(ThreadPool *pool);
void thread_pool_join(ThreadPool *pool);
void thread_pool_add_task(ThreadPool *pool, WorkerTaskProc *proc, void *data);
void thread_pool_kick(ThreadPool *pool);
void thread_pool_kick_and_wait(ThreadPool *pool);
GB_THREAD_PROC(worker_thread_internal);
void thread_pool_init(ThreadPool *pool, gbAllocator const &a, isize thread_count, char const *worker_prefix) {
pool->original_allocator = a;
gbAllocator tpa = thread_pool_allocator(pool);
pool->tasks = array_make<WorkerTask>(tpa, 0, 1024);
pool->threads = array_make<gbThread>(tpa, thread_count);
gb_mutex_init(&pool->task_mutex);
gb_mutex_init(&pool->mutex);
gb_semaphore_init(&pool->semaphore);
pool->is_running = true;
pool->worker_prefix_len = 0;
if (worker_prefix) {
i32 worker_prefix_len = cast(i32)gb_strlen(worker_prefix);
worker_prefix_len = gb_min(worker_prefix_len, 10);
gb_memmove(pool->worker_prefix, worker_prefix, worker_prefix_len);
pool->worker_prefix_len = worker_prefix_len;
}
for_array(i, pool->threads) {
gbThread *t = &pool->threads[i];
gb_thread_init(t);
t->user_index = i;
if (pool->worker_prefix_len > 0) {
char worker_name[16] = {};
gb_snprintf(worker_name, gb_size_of(worker_name), "%.*s%u", pool->worker_prefix_len, pool->worker_prefix, cast(u16)i);
gb_thread_set_name(t, worker_name);
}
}
}
void thread_pool_start(ThreadPool *pool) {
for_array(i, pool->threads) {
gbThread *t = &pool->threads[i];
gb_thread_start(t, worker_thread_internal, pool);
}
}
void thread_pool_join(ThreadPool *pool) {
pool->is_running = false;
for_array(i, pool->threads) {
gb_semaphore_release(&pool->semaphore);
}
for_array(i, pool->threads) {
gbThread *t = &pool->threads[i];
gb_thread_join(t);
}
}
void thread_pool_destroy(ThreadPool *pool) {
thread_pool_join(pool);
gb_semaphore_destroy(&pool->semaphore);
gb_mutex_destroy(&pool->mutex);
gb_mutex_destroy(&pool->task_mutex);
array_free(&pool->threads);
array_free(&pool->tasks);
}
void thread_pool_add_task(ThreadPool *pool, WorkerTaskProc *proc, void *data) {
gb_mutex_lock(&pool->task_mutex);
WorkerTask task = {};
task.do_work = proc;
task.data = data;
array_add(&pool->tasks, task);
gb_mutex_unlock(&pool->task_mutex);
gb_semaphore_post(&pool->semaphore, 1);
}
void thread_pool_kick(ThreadPool *pool) {
if (pool->tasks.count > 0) {
isize count = gb_min(pool->tasks.count, pool->threads.count);
for (isize i = 0; i < count; i++) {
gb_semaphore_post(&pool->semaphore, 1);
}
}
}
void thread_pool_kick_and_wait(ThreadPool *pool) {
thread_pool_kick(pool);
isize return_value = 0;
while (pool->tasks.count > 0 || gb_atomic32_load(&pool->processing_work_count) != 0) {
gb_yield();
}
thread_pool_join(pool);
}
GB_THREAD_PROC(worker_thread_internal) {
ThreadPool *pool = cast(ThreadPool *)thread->user_data;
thread->return_value = 0;
while (pool->is_running) {
gb_semaphore_wait(&pool->semaphore);
WorkerTask task = {};
bool got_task = false;
if (gb_mutex_try_lock(&pool->task_mutex)) {
if (pool->tasks.count > 0) {
gb_atomic32_fetch_add(&pool->processing_work_count, +1);
task = array_pop(&pool->tasks);
got_task = true;
}
gb_mutex_unlock(&pool->task_mutex);
}
if (got_task) {
thread->return_value = task.do_work(task.data);
gb_atomic32_fetch_add(&pool->processing_work_count, -1);
}
}
return thread->return_value;
}
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