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package thread
import "core:intrinsics"
import "core:sync"
import "core:mem"
Task_Status :: enum i32 {
Ready,
Busy,
Waiting,
Term,
}
Task_Proc :: #type proc(task: ^Task)
Task :: struct {
procedure: Task_Proc,
data: rawptr,
user_index: int,
}
Task_Id :: distinct i32
INVALID_TASK_ID :: Task_Id(-1)
Pool :: struct {
allocator: mem.Allocator,
mutex: sync.Mutex,
sem_available: sync.Semaphore,
processing_task_count: int, // atomic
is_running: bool,
threads: []^Thread,
tasks: [dynamic]Task,
}
pool_init :: proc(pool: ^Pool, thread_count: int, allocator := context.allocator) {
worker_thread_internal :: proc(t: ^Thread) {
pool := (^Pool)(t.data)
for pool.is_running {
sync.semaphore_wait_for(&pool.sem_available)
if task, ok := pool_try_and_pop_task(pool); ok {
pool_do_work(pool, &task)
}
}
sync.semaphore_post(&pool.sem_available, 1)
}
context.allocator = allocator
pool.allocator = allocator
pool.tasks = make([dynamic]Task)
pool.threads = make([]^Thread, thread_count)
sync.mutex_init(&pool.mutex)
sync.semaphore_init(&pool.sem_available)
pool.is_running = true
for _, i in pool.threads {
t := create(worker_thread_internal)
t.user_index = i
t.data = pool
pool.threads[i] = t
}
}
pool_destroy :: proc(pool: ^Pool) {
delete(pool.tasks)
for thread in &pool.threads {
destroy(thread)
}
delete(pool.threads, pool.allocator)
sync.mutex_destroy(&pool.mutex)
sync.semaphore_destroy(&pool.sem_available)
}
pool_start :: proc(pool: ^Pool) {
for t in pool.threads {
start(t)
}
}
pool_join :: proc(pool: ^Pool) {
pool.is_running = false
sync.semaphore_post(&pool.sem_available, len(pool.threads))
yield()
for t in pool.threads {
join(t)
}
}
pool_add_task :: proc(pool: ^Pool, procedure: Task_Proc, data: rawptr, user_index: int = 0) {
sync.mutex_lock(&pool.mutex)
defer sync.mutex_unlock(&pool.mutex)
task: Task
task.procedure = procedure
task.data = data
task.user_index = user_index
append(&pool.tasks, task)
sync.semaphore_post(&pool.sem_available, 1)
}
pool_try_and_pop_task :: proc(pool: ^Pool) -> (task: Task, got_task: bool = false) {
if sync.mutex_try_lock(&pool.mutex) {
if len(pool.tasks) != 0 {
intrinsics.atomic_add(&pool.processing_task_count, 1)
task = pop_front(&pool.tasks)
got_task = true
}
sync.mutex_unlock(&pool.mutex)
}
return
}
pool_do_work :: proc(pool: ^Pool, task: ^Task) {
task.procedure(task)
intrinsics.atomic_sub(&pool.processing_task_count, 1)
}
pool_wait_and_process :: proc(pool: ^Pool) {
for len(pool.tasks) != 0 || intrinsics.atomic_load(&pool.processing_task_count) != 0 {
if task, ok := pool_try_and_pop_task(pool); ok {
pool_do_work(pool, &task)
}
// Safety kick
if len(pool.tasks) != 0 && intrinsics.atomic_load(&pool.processing_task_count) == 0 {
sync.mutex_lock(&pool.mutex)
sync.semaphore_post(&pool.sem_available, len(pool.tasks))
sync.mutex_unlock(&pool.mutex)
}
yield()
}
pool_join(pool)
}
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