百度试题 结果1 题目 If the initial value of semaphore S is 2 in a wait() and signal() operation, its current value is -ljhat means there are ( ) A. O B. l C. 2 D. 3 相关知识点: 试题来源: 解析 B 反馈 收藏
procedure signal(s:semaphore); begins.value : = s.value + 1; if ( 2 ) then wakeup(s.L)end; 问题:wait操作相当于 资源,(1)处应为 ,block(s.L)代表将当前进程插入到信号量s的等待队列中。signal操作相当于 资源,(2)处应为 ,wakeup(s.L)代表唤醒s等待队列的第一个进程。
SignalAndWait(WaitHandle, WaitHandle, Int32, Boolean) ПередаетсигналодномуобъектуWaitHandleи ожидаетсигнализациидругого, задаваявремяожиданияввиде 32-разрядногоцелогочисл...
wait原语执行后，B进程会进入阻塞队列，此时wait已经执行完毕，以后的进程调度就不会再调度B了。因为B并...
这次是独占的 signal_wait_time_ms。 max_wait_time_ms bigint 该等待类型的最长等待时间。 signal_wait_time_ms bigint 正在等待的线程从收到信号通知到其开始运行之间的时差。 pdw_node_id int 此分发所在节点的标识符。适用于:Azure Synapse Analytics、Analytics ...
Semaphore wait has lasted 600 seconds 解决方案:set global innodb_adaptive_hash_index=0;
sem_post atomically increases the count of the semaphore pointed to by sem. This function never blocks and can safely be used in asynchronous signal handlers.//解除信号量等待限制。让信号量计数加1.该函数会⽴即返回不等待。sem_getvalue stores in the location pointed to by sval the current ...
sem_post atomically increases the count of the semaphore pointed to by sem. This function never blocks and can safely be used in asynchronous signal handlers. //解除信号量等待限制。让信号量计数加1.该函数会立即返回不等待。 sem_getvalue stores in the location pointed to by sval the current cou...
sem_post atomically increases the count of the semaphore pointed to by sem. This function never blocks and can safely be used in asynchronous signal handlers. //解除信号量等待限制。让信号量计数加1.该函数会立即返回不等待。 sem_getvalue stores in the location pointed to by sval the current cou...
sem_post atomically increases the count of the semaphore pointed to by sem. This function never blocks and can safely be used in asynchronous signal handlers. //解除信号量等待限制。让信号量计数加1.该函数会立即返回不等待。 sem_getvalue stores in the location pointed to by sval the current cou...