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...
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...
KVM needs a wait to atomically remove themselves from the eventfd ->poll() wait queue head, in order to handle correctly their IRQfd deassign operation. This patch introduces such API, plus a way to read an eventfd from its context. Signed-off-by: Davide Libenzi <davidel@xmailserver.org>...
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...
Definition Namespace: Microsoft.Windows.EventTracing.Cpu Assembly: Microsoft.Windows.EventTracing.Cpu.dll C# 複製 public enum KernelWaitReason Inheritance Enum KernelWaitReason Fields 展開資料表 NameValueDescription Executive 0 FreePage 1 PageIn 2 PoolAllocation 3 DelayExecution 4 Suspended ...
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 ...
Here's the definition of "wake_up_all". Set the state of all tasks in the wait queue to TASK_RUNNABLE to wake them up. Understanding the working of these functions and their combination is proving to be difficult for me. I am unsure about the timing of the CONDITION check. Does it ...
(q); goto error; } @@ -2109,7 +2181,7 @@ static int futex_fd(u32 __user *uaddr, i filp->private_data = q; queue_me(q, ret, filp); - up_read(¤t->mm->mmap_sem); + up_read(shared); /* Now we map fd to filp, so userspace can access it */ fd_install(ret...
A GPU pipeline is synchronized by sending a fence command from a first module to an addressed synchronization register pair. Fence command associated data may be stored in a fence r