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//
// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
#include "nng/nng.h"
typedef struct nni_taskq_thr nni_taskq_thr;
struct nni_taskq_thr {
nni_taskq *tqt_tq;
nni_thr tqt_thread;
};
struct nni_taskq {
nni_list tq_tasks;
nni_mtx tq_mtx;
nni_cv tq_sched_cv;
nni_cv tq_wait_cv;
nni_taskq_thr *tq_threads;
int tq_nthreads;
bool tq_run;
};
static nni_taskq *nni_taskq_systq = NULL;
static void
nni_taskq_thread(void *self)
{
nni_taskq_thr *thr = self;
nni_taskq *tq = thr->tqt_tq;
nni_task *task;
nni_thr_set_name(NULL, "nng:task");
nni_mtx_lock(&tq->tq_mtx);
for (;;) {
if ((task = nni_list_first(&tq->tq_tasks)) != NULL) {
nni_list_remove(&tq->tq_tasks, task);
nni_mtx_unlock(&tq->tq_mtx);
task->task_cb(task->task_arg);
nni_mtx_lock(&task->task_mtx);
task->task_busy--;
if (task->task_busy == 0) {
nni_cv_wake(&task->task_cv);
}
nni_mtx_unlock(&task->task_mtx);
nni_mtx_lock(&tq->tq_mtx);
continue;
}
nni_cv_wake(&tq->tq_wait_cv);
if (!tq->tq_run) {
break;
}
nni_cv_wait(&tq->tq_sched_cv);
}
nni_mtx_unlock(&tq->tq_mtx);
}
int
nni_taskq_init(nni_taskq **tqp, int nthr)
{
nni_taskq *tq;
if ((tq = NNI_ALLOC_STRUCT(tq)) == NULL) {
return (NNG_ENOMEM);
}
if ((tq->tq_threads = NNI_ALLOC_STRUCTS(tq->tq_threads, nthr)) ==
NULL) {
NNI_FREE_STRUCT(tq);
return (NNG_ENOMEM);
}
tq->tq_nthreads = nthr;
NNI_LIST_INIT(&tq->tq_tasks, nni_task, task_node);
nni_mtx_init(&tq->tq_mtx);
nni_cv_init(&tq->tq_sched_cv, &tq->tq_mtx);
nni_cv_init(&tq->tq_wait_cv, &tq->tq_mtx);
for (int i = 0; i < nthr; i++) {
int rv;
tq->tq_threads[i].tqt_tq = tq;
rv = nni_thr_init(&tq->tq_threads[i].tqt_thread,
nni_taskq_thread, &tq->tq_threads[i]);
if (rv != 0) {
nni_taskq_fini(tq);
return (rv);
}
}
tq->tq_run = true;
for (int i = 0; i < tq->tq_nthreads; i++) {
nni_thr_run(&tq->tq_threads[i].tqt_thread);
}
*tqp = tq;
return (0);
}
void
nni_taskq_fini(nni_taskq *tq)
{
if (tq == NULL) {
return;
}
if (tq->tq_run) {
nni_mtx_lock(&tq->tq_mtx);
tq->tq_run = false;
nni_cv_wake(&tq->tq_sched_cv);
nni_mtx_unlock(&tq->tq_mtx);
}
for (int i = 0; i < tq->tq_nthreads; i++) {
nni_thr_fini(&tq->tq_threads[i].tqt_thread);
}
nni_cv_fini(&tq->tq_wait_cv);
nni_cv_fini(&tq->tq_sched_cv);
nni_mtx_fini(&tq->tq_mtx);
NNI_FREE_STRUCTS(tq->tq_threads, tq->tq_nthreads);
NNI_FREE_STRUCT(tq);
}
bool
nni_taskq_drain(nni_taskq *tq)
{
bool result = false;
nni_mtx_lock(&tq->tq_mtx);
while (!nni_list_empty(&tq->tq_tasks)) {
result = true;
nni_cv_wait(&tq->tq_wait_cv);
}
nni_mtx_unlock(&tq->tq_mtx);
return (result);
}
void
nni_task_exec(nni_task *task)
{
nni_mtx_lock(&task->task_mtx);
if (task->task_prep) {
task->task_prep = false;
} else {
task->task_busy++;
}
nni_mtx_unlock(&task->task_mtx);
if (task->task_cb != NULL) {
task->task_cb(task->task_arg);
}
nni_mtx_lock(&task->task_mtx);
task->task_busy--;
if (task->task_busy == 0) {
nni_cv_wake(&task->task_cv);
}
nni_mtx_unlock(&task->task_mtx);
}
void
nni_task_dispatch(nni_task *task)
{
nni_taskq *tq = task->task_tq;
// If there is no callback to perform, then do nothing!
// The user will be none the wiser.
if (task->task_cb == NULL) {
nni_task_exec(task);
return;
}
nni_mtx_lock(&task->task_mtx);
if (task->task_prep) {
task->task_prep = false;
} else {
task->task_busy++;
}
nni_mtx_unlock(&task->task_mtx);
nni_mtx_lock(&tq->tq_mtx);
nni_list_append(&tq->tq_tasks, task);
nni_cv_wake1(&tq->tq_sched_cv); // waking just one waiter is adequate
nni_mtx_unlock(&tq->tq_mtx);
}
void
nni_task_prep(nni_task *task)
{
nni_mtx_lock(&task->task_mtx);
task->task_busy++;
task->task_prep = true;
nni_mtx_unlock(&task->task_mtx);
}
void
nni_task_abort(nni_task *task)
{
// This is called when unscheduling the task.
nni_mtx_lock(&task->task_mtx);
if (task->task_prep) {
task->task_prep = false;
task->task_busy--;
if (task->task_busy == 0) {
nni_cv_wake(&task->task_cv);
}
}
nni_mtx_unlock(&task->task_mtx);
}
void
nni_task_wait(nni_task *task)
{
nni_mtx_lock(&task->task_mtx);
while (task->task_busy) {
nni_cv_wait(&task->task_cv);
}
nni_mtx_unlock(&task->task_mtx);
}
bool
nni_task_busy(nni_task *task)
{
bool busy;
nni_mtx_lock(&task->task_mtx);
busy = task->task_busy;
nni_mtx_unlock(&task->task_mtx);
return (busy);
}
void
nni_task_init(nni_task *task, nni_taskq *tq, nni_cb cb, void *arg)
{
NNI_LIST_NODE_INIT(&task->task_node);
nni_mtx_init(&task->task_mtx);
nni_cv_init(&task->task_cv, &task->task_mtx);
task->task_prep = false;
task->task_busy = 0;
task->task_cb = cb;
task->task_arg = arg;
task->task_tq = tq != NULL ? tq : nni_taskq_systq;
}
void
nni_task_fini(nni_task *task)
{
nni_mtx_lock(&task->task_mtx);
while (task->task_busy) {
nni_cv_wait(&task->task_cv);
}
nni_mtx_unlock(&task->task_mtx);
nni_cv_fini(&task->task_cv);
nni_mtx_fini(&task->task_mtx);
}
int
nni_taskq_sys_init(nng_init_params *params)
{
int16_t num_thr;
int16_t max_thr;
max_thr = params->max_task_threads;
num_thr = params->num_task_threads;
if ((max_thr > 0) && (num_thr > max_thr)) {
num_thr = max_thr;
}
if (num_thr < 2) {
num_thr = 2;
}
params->num_task_threads = num_thr;
return (nni_taskq_init(&nni_taskq_systq, (int) num_thr));
}
bool
nni_taskq_sys_drain(void)
{
return (nni_taskq_drain(nni_taskq_systq));
}
void
nni_taskq_sys_fini(void)
{
nni_taskq_fini(nni_taskq_systq);
nni_taskq_systq = NULL;
}
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