若使用wait queue功能,需要包含/linux/wait.h头文件。可基于动态和静态两种方式实现等待队列的初始化。 静态方式: DECLARE_WAIT_QUEUE_HEAD(wq); 其中,wq是要将任务置于睡眠状态的队列的名称。 动态方式: wait_queue_head_t wq; init_waitqueue_head (&wq); 除了创建等待队列的方式不同之外,其他操作对于静态和...
};module_platform_driver(test_driver);MODULE_DESCRIPTION("KERNEL Common API Test");MODULE_LICENSE("GPL"); 原子、信号量、等待队列 atomic_t 定义:这儿 典型使用场景:多进程中共享资源的计数加减。例如,硬件设备往往只有一个,usr space层可能同时存在多个进程在访问该设备,则用此来保存client数。 常用API: a...
* @wait: [in] Wait queue to be removed. * @cnt: [out] Pointer to the 64bit conter value. * * Returns zero if successful, or the following error codes: * * -EAGAIN : The operation would have blocked. * * This is used to atomically remove a wait queue entry from the eventfd wai...
In this case an AUTOFS_IOC_EXPIRE_MULTI ioctl is done, then a new waitqueue struct is allocated in autofs_wait(), its initial wait_ctr equals 2. After that wait_event_killable() is interrupted (it returns -ERESTARTSYS), so that 'wq->name.name == NULL' condition may be not satisfie...
The kernel hangs up after a flood of list_del corruption messages are logged where ep_unregister_pollwait() --> remove_wait_queue() --> list_del() are called.Raw [922934.870103] ---[ cut here ]--- [922934.871066] WARNING: CPU: 1 PID: 1090 at lib/list_debug.c:53 __list_del_en...
PG_THREAD_WAIT_STATUS allows you to test the block waiting status about the backend thread and auxiliary thread of the current instance.The waiting statuses in the wait_s
689 __wait_on_bit(page_waitqueue(page), &wait, sleep_on_page, 690 TASK_UNINTERRUPTIBLE); 691 } 692 EXPORT_SYMBOL(wait_on_page_bit); When calling wait_on_page_bit: Raw /usr/src/debug/kernel-3.10.0-327.36.3.el7/linux-3.10.0-327.36.3.el7.x86_64/include/linux/pagemap.h: 432 ...
queue id The ID of the OLTP queue for which this session is waiting. process# The process number of the process in which this session runs. wait time The intended wait time for this session. queue waitThe direct loader uses a queue of slots for managing buffers. These slots are ...
The request structure needs to be inserted to a request queue in serial mode. TwoPhaseStateLock Used to prevent concurrent access to or modification on two-phase information sharing arrays. TablespaceCreateLock Used to check whether a tablespace exists. BtreeVacuumLock Used to prevent VACUUM ...
DpRqQInit: keep protect_queue / slots_per_queue 0 / 2001 in sys_admrdisp/queue_size_check_value : -> on,50,30,40,500,50,500,80EmInit: MmSetImplementation( 2 ).MM global diagnostic options set: 0<ES> client 0 initializing ...<ES> InitFreeList<ES> block size is 4096 kByte.<ES...