static void
ngx_thread_pool_destroy(ngx_thread_pool_t *tp)
{
ngx_uint_t n;
ngx_thread_task_t task;
volatile ngx_uint_t lock;
ngx_memzero(&task, sizeof(ngx_thread_task_t));
task.handler = ngx_thread_pool_exit_handler;
task.ctx = (void *) &lock;
for (n = 0; n < tp->threads; n++)
{
lock = 1;
if (ngx_thread_task_post(tp, &task) != NGX_OK)
{
return;
}
while (lock)
{
ngx_sched_yield();
}
task.event.active = 0;
}
(void) ngx_thread_cond_destroy(&tp->cond, tp->log);
(void) ngx_thread_mutex_destroy(&tp->mtx, tp->log);
}
static void
ngx_thread_pool_destroy(ngx_thread_pool_t *tp)
{
ngx_uint_t n;
ngx_thread_task_t task;
volatile ngx_uint_t lock;
ngx_memzero(&task, sizeof(ngx_thread_task_t));
task.handler = ngx_thread_pool_exit_handler;//任务退出执行函数
task.ctx = (void *) &lock;//指向传入的参数
// 没有赋值task->event.handler task->event.data (void) ngx_notify(ngx_thread_pool_handler); 中会不会段错误??? /
for (n = 0; n < tp->threads; n++) { //tp中所有的线程池添加该任务
lock = 1;
if (ngx_thread_task_post(tp, &task) != NGX_OK) {
return;
}
while (lock) { //主进程判断如果lock没有改变，就让CPU给其他线程执行，以此等待，相当于pthread_join
ngx_sched_yield();
}
//只有线程池中的一个线程执行了exit_handler后才能会继续for循环
task.event.active = 0;
}
//此时到这边，所有的线程都已经退出 //条件变量销毁 互斥锁
(void) ngx_thread_cond_destroy(&tp->cond, tp->log);
(void) ngx_thread_mutex_destroy(&tp->mtx, tp->log);
}
//根据thread_pool name threads=number [max_queue=number];中的number来创建这么多个线程
static ngx_int_t
ngx_thread_pool_init(ngx_thread_pool_t *tp, ngx_log_t *log, ngx_pool_t *pool)
{
int err;
pthread_t tid;
ngx_uint_t n;
pthread_attr_t attr;
if (ngx_notify == NULL) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"the configured event method cannot be used with thread pools");
return NGX_ERROR;
}
ngx_thread_pool_queue_init(&tp->queue);
if (ngx_thread_mutex_create(&tp->mtx, log) != NGX_OK) {
return NGX_ERROR;
}
if (ngx_thread_cond_create(&tp->cond, log) != NGX_OK) {
(void) ngx_thread_mutex_destroy(&tp->mtx, log);
return NGX_ERROR;
}
tp->log = log;
err = pthread_attr_init(&attr);
if (err) {
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_attr_init() failed");
return NGX_ERROR;
}
#if 0
err = pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN);
if (err) {
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_attr_setstacksize() failed");
return NGX_ERROR;
}
#endif
for (n = 0; n < tp->threads; n++) {
/*
线程原语：pthread_create()，pthread_self()，pthread_exit(),pthread_join(),pthread_cancel(),pthread_detach( .
好的线程理解大全参考(有图解例子，很好):http://blog.csdn.net/tototuzuoquan/article/details/39553427
*/
err = pthread_create(&tid, &attr, ngx_thread_pool_cycle, tp);
if (err) {
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_create() failed");
return NGX_ERROR;
}
}
(void) pthread_attr_destroy(&attr);
return NGX_OK;
}
static ngx_int_t
ngx_thread_pool_init(ngx_thread_pool_t *tp, ngx_log_t *log, ngx_pool_t *pool)
{
int err;
pthread_t tid;
ngx_uint_t n;
pthread_attr_t attr;
if (ngx_notify == NULL)
{
ngx_log_error(NGX_LOG_ALERT, log, 0,
"the configured event method cannot be used with thread pools");
return NGX_ERROR;
}
ngx_thread_pool_queue_init(&tp->queue);
if (ngx_thread_mutex_create(&tp->mtx, log) != NGX_OK)
{
return NGX_ERROR;
}
if (ngx_thread_cond_create(&tp->cond, log) != NGX_OK)
{
(void) ngx_thread_mutex_destroy(&tp->mtx, log);
return NGX_ERROR;
}
tp->log = log;
err = pthread_attr_init(&attr);
if (err)
{
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_attr_init() failed");
return NGX_ERROR;
}
#if 0
err = pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN);
if (err)
{
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_attr_setstacksize() failed");
return NGX_ERROR;
}
#endif
for (n = 0; n < tp->threads; n++)
{
err = pthread_create(&tid, &attr, ngx_thread_pool_cycle, tp);
if (err)
{
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_create() failed");
return NGX_ERROR;
}
}
(void) pthread_attr_destroy(&attr);
return NGX_OK;
}
