// Java程序演示// LinkedBlockingQueue的poll(long timeout, TimeUnit unit)方法importjava.util.concurrent.LinkedBlockingQueue;importjava.util.concurrent.BlockingQueue;importjava.util.concurrent.TimeUnit;publicclassGFG{publicstaticvoidmain(String[]args)throwsInterruptedException{// 定义BlockingQueue的容量intcapaci...
q = parallel.pool.PollableDataQueue; The helper functionmagicWithSenddefined at the end of this example sends the sum of a magic square to aDataQueueorPollableDataQueueobject, then returns that magic square. UseparfevalandbackgroundPoolto run the functionmagicWithSendin the background. ...
(); pwq->triggered = 1;// 标记为已触发 // 唤醒调用进程 return default_wake_function(&dummy_wait, mode, sync, key); } // 默认的唤醒函数,poll/select 设置的回调函数会调用此函数唤醒 // 直接唤醒等待队列上的线程,即将线程移到运行队列(rq) int default_wake_function(wait_queue_t *curr, ...
In that time the data and function for parfeval have been serialized, sent over to the workers, deserialized and set running. When you start the code, the worker sends some data, which is serialized, sent over the network back to the client and put on a data queue. poll notes this ...
A Queue that addtionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become avialable in the queue when storing an element. 阻塞队列中提供了2个操作: 队列为空时,获取元素的线程会阻塞队列一直至队列非空。
("%s %s line %d\n",__FILE__,__FUNCTION__,__LINE__);poll_wait(fp,&queue_wait,wait);if(atomic_read(&dev->releasekey)){/* 按键按下 */ret=POLLIN|POLLRDNORM;/* 返回 PLLIN */}returnret;}……/* 定义自己的file_operations结构体 */staticstruct file_operations gpio_key_drv={.owner=...
{ int res = 0, eavail, timed_out = 0; unsigned long flags; long slack = 0; wait_queue_t wait; ktime_t expires, *to = NULL; if (timeout > 0) { // 转换为内核时间 struct timespec end_time = ep_set_mstimeout(timeout); slack = select_estimate_accuracy(&end_time); to = ...
int default_wake_function(wait_queue_entry_t *curr, unsigned mode, int wake_flags, void *key) { //curr->private就是 pwq->polling_task return try_to_wake_up(curr->private, mode, wake_flags); } 对于epoll的curr->func是ep_poll_callback ,而对于select是pollwake,这俩回调是有差异的: ...
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{unsignedintflags;void*private;// 这里的func就是上述休眠的时候在init_wait_entry传递autoremove_wake_functionwait_queue_func_tfunc;structlist_headentry;};// 唤醒函数intautoremove_wake_function(structwait_queue_entry*wq_entry,unsignedmode,intsync,void*key){// 公用的唤醒函数逻辑// 内部执行try_to_...