wait queue示例

wait queue示例展示
最新推荐文章于 2024-06-03 11:20:41 发布
原创 最新推荐文章于 2024-06-03 11:20:41 发布 · 273 阅读 · 0 ·
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博客主要围绕wait queue示例展开，但具体内容缺失。wait queue在信息技术领域有重要应用，可用于线程同步等场景。

定义
初始化

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Peter__Ge
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源码剖析之wait queue
哈哈
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wait queue在内核中，一般使用等待队列(wait queue)实现当发生特定事件时的异步通知 具体方法如下： 1. 为每个特定的事件（可读、可写等）维护一个等待队列，本质上是一个双向链表 2. 关心该事件的实体作为等待队列中一项加入该等待队列中 3. 每个等待队列项包含关注该事件的实体的信息（进程、线程），以及回调函数 4. 当关注的事件发生时，会遍历相应的等待队列，调用每个节点中
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core.c int default_wake_function(wait_queue_entry_t *curr, unsigned mode, int wake_flags, void *key) { return try_to_wake_up(curr->private, mode, wake_flags, 1); // wake up a thread } EXPORT_SYMBOL(default_wake_function); wait.h /* A single wait-queue
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<br />一、定义：<br />/include/linux/wait.h<br /> <br />struct __wait_queue_head { <br />spinlock_t lock; <br />struct list_head task_list; <br />}; <br />typedef struct __wait_queue_head wait_queue_head_t;<br />二、作用：<br />在内核里面，等待队列是有很多用处的，尤其是在中断处理、进程同步、定时等场合。
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在Linux驱动程序中，可以使用等待队列(waitqueue)来实现阻塞进程的唤醒。waitqueue很早就作为一种基本的功能单位出现在Linux内核里了，它以队列位基础数据结构，与进程调度机制紧密结合，能够用于实现内核中异步事件通知机制。等待队列可以用来同步对系统资源的访问。(信号量在内核中也依赖等待队列来实现)。     Linux-2.6提供如下关于等待队列的操作:     (1) 定义
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驱动中使用等待队列来实现阻塞进程的唤醒，它以队列为基础数据结构，与进程调度机制紧密结合。 定义等待队列头部 wait_queue_head_t my_queue; 初始化“等待队列头部” init_waiatqueue_head(&my_queue); （PS:下面的宏可以作为定义并初始化等待队列头部的快捷方式 DECLARE_WAIT_QUEUE_HEAD(n
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好的，用户想了解workqueue和waitqueue，这两个都是Linux内核中的机制。我需要先回忆它们各自的定义、用途和区别。 首先，workqueue，也就是工作队列。记得它是用来处理延后执行的任务，把工作推后到内核线程中执行...
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- `Queue.get_nowait(item)`：不等待，直接尝试从队列中取出元素。 - `Queue.task_done()`：标记一个任务已完成，用于配合`join()`方法，确保所有任务都执行完毕。 - `Queue.join()`：阻塞直到队列中的所有任务都被...
----- Waiting Channels: pid 18951 at 2025-09-02 18:52:37.394200649+0800 ----- Cmd line: com.eg.android.AlipayGphone sysTid=18951 state= ptrace_stop sysTid=22904 state= ptrace_stop sysTid=22907 state= ptrace_stop sysTid=22908 state= ptrace_stop sysTid=22910 state= ptrace_stop sysTid=22914 state= ptrace_stop sysTid=22919 state= ptrace_stop sysTid=22920 state= ptrace_stop sysTid=22922 state= ptrace_stop sysTid=22925 state= ptrace_stop sysTid=22934 state= ptrace_stop sysTid=22935 state= ptrace_stop sysTid=22938 state= ptrace_stop sysTid=22954 state= ptrace_stop sysTid=22960 state= ptrace_stop sysTid=22961 state= futex_wait_queue sysTid=22962 state= do_epoll_wait sysTid=22963 state= do_epoll_wait sysTid=22964 state= futex_wait_queue sysTid=22992 state= futex_wait_queue sysTid=22993 state= 0 sysTid=23008 state= 0 sysTid=23011 state= futex_wait_queue sysTid=23019 state= do_wait_intr_irq sysTid=23025 state= 0 sysTid=23031 state= 0 sysTid=23033 state= do_epoll_wait sysTid=23034 state= futex_wait_queue sysTid=23040 state= do_epoll_wait sysTid=23042 state= do_epoll_wait sysTid=23046 state= do_epoll_wait sysTid=23047 state= do_epoll_wait sysTid=23053 state= do_epoll_wait sysTid=23056 state= futex_wait_queue sysTid=23062 state= do_epoll_wait sysTid=23063 state= futex_wait_queue sysTid=23064 state= 0 sysTid=23078 state= futex_wait_queue sysTid=23088 state= do_epoll_wait sysTid=23090 state= do_epoll_wait sysTid=23091 state= do_epoll_wait sysTid=23094 state= 0 sysTid=23122 state= binder_thread_read sysTid=23135 state= do_epoll_wait sysTid=23138 state= do_epoll_wait sysTid=23141 state= 0 sysTid=23147 state= futex_wait_queue sysTid=23167 state= futex_wait_queue sysTid=23171 state= do_epoll_wait sysTid=23178 state= futex_wait_queue sysTid=23189 state= do_epoll_wait sysTid=23190 state= futex_wait_queue sysTid=23195 state= futex_wait_queue sysTid=23201 state= futex_wait_queue sysTid=23218 state= futex_wait_queue sysTid=23219 state= futex_wait_queue sysTid=23221 state= do_epoll_wait sysTid=23226 state= do_epoll_wait sysTid=23229 state= futex_wait_queue sysTid=23231 state= futex_wait_queue sysTid=23250 state= futex_wait_queue sysTid=23257 state= do_epoll_wait sysTid=23260 state= 0 sysTid=23266 state= futex_wait_queue sysTid=23273 state= binder_thread_read sysTid=23288 state= futex_wait_queue sysTid=23289 state= futex_wait_queue sysTid=23291 state= futex_wait_queue sysTid=23292 state= futex_wait_queue sysTid=23293 state= futex_wait_queue sysTid=23294 state= futex_wait_queue sysTid=23295 state= do_epoll_wait sysTid=23306 state= futex_wait_queue sysTid=23345 state= futex_wait_queue sysTid=23398 state= futex_wait_queue sysTid=23413 state= 0 sysTid=23415 state= do_epoll_wait sysTid=23417 state= binder_thread_read sysTid=23426 state= do_epoll_wait sysTid=23432 state= futex_wait_queue sysTid=23433 state= futex_wait_queue sysTid=23440 state= binder_thread_read sysTid=23441 state= futex_wait_queue sysTid=23443 state= futex_wait_queue sysTid=23444 state= futex_wait_queue sysTid=23445 state= do_sys_poll sysTid=23448 state= futex_wait_queue sysTid=23449 state= futex_wait_queue sysTid=23450 state= futex_wait_queue sysTid=23452 state= do_epoll_wait sysTid=23454 state= futex_wait_queue sysTid=23476 state= futex_wait_queue sysTid=23478 state= futex_wait_queue sysTid=23479 state= futex_wait_queue sysTid=23482 state= futex_wait_queue sysTid=23483 state= futex_wait_queue sysTid=23484 state= futex_wait_queue sysTid=23486 state= futex_wait_queue sysTid=23487 state= futex_wait_queue sysTid=23510 state= binder_thread_read sysTid=23523 state= 0 sysTid=23525 state= do_sys_poll sysTid=23527 state= do_sys_poll sysTid=23529 state= do_sys_poll sysTid=23550 state= do_epoll_wait sysTid=23558 state= futex_wait_queue sysTid=23560 state= futex_wait_queue sysTid=23578 state= futex_wait_queue sysTid=23586 state= binder_thread_read sysTid=23587 state= futex_wait_queue sysTid=23634 state= unix_stream_read_generic sysTid=23636 state= do_epoll_wait sysTid=23642 state= futex_wait_queue sysTid=23661 state= futex_wait_queue sysTid=23662 state= futex_wait_queue sysTid=23663 state= futex_wait_queue sysTid=23664 state= futex_wait_queue sysTid=23665 state= futex_wait_queue sysTid=23667 state= futex_wait_queue sysTid=23668 state= futex_wait_queue sysTid=23671 state= futex_wait_queue sysTid=23672 state= do_epoll_wait sysTid=23677 state= futex_wait_queue sysTid=23681 state= futex_wait_queue sysTid=23684 state= futex_wait_queue sysTid=23688 state= futex_wait_queue sysTid=23693 state= futex_wait_queue sysTid=23695 state= 0 sysTid=23696 state= futex_wait_queue sysTid=23704 state= 0 sysTid=23706 state= futex_wait_queue sysTid=23709 state= futex_wait_queue sysTid=23711 state= futex_wait_queue sysTid=23719 state= wait_woken sysTid=23720 state= wait_woken sysTid=23724 state= futex_wait_queue sysTid=23728 state= futex_wait_queue sysTid=23731 state= 0 sysTid=23735 state= futex_wait_queue sysTid=23737 state= futex_wait_queue sysTid=23742 state= futex_wait_queue sysTid=23744 state= futex_wait_queue sysTid=23747 state= wait_woken sysTid=23768 state= futex_wait_queue sysTid=23777 state= 0 sysTid=23783 state= futex_wait_queue sysTid=23784 state= futex_wait_queue sysTid=23792 state= futex_wait_queue sysTid=23821 state= binder_thread_read sysTid=23822 state= futex_wait_queue sysTid=23825 state= futex_wait_queue sysTid=23838 state= futex_wait_queue sysTid=23840 state= futex_wait_queue sysTid=23841 state= futex_wait_queue sysTid=23843 state= futex_wait_queue sysTid=23857 state= futex_wait_queue sysTid=23861 state= futex_wait_queue sysTid=23862 state= do_sys_poll sysTid=23886 state= do_epoll_wait sysTid=23891 state= futex_wait_queue sysTid=23920 state= futex_wait_queue sysTid=23921 state= 0 sysTid=23929 state= futex_wait_queue sysTid=23939 state= do_sys_poll sysTid=23948 state= futex_wait_queue sysTid=23957 state= futex_wait_queue sysTid=23975 state= 0 sysTid=23993 state= futex_wait_queue sysTid=23996 state= futex_wait_queue sysTid=23997 state= futex_wait_queue sysTid=23999 state= 0 sysTid=24001 state= do_sys_poll sysTid=24002 state= futex_wait_queue sysTid=24004 state= futex_wait_queue sysTid=24013 state= do_epoll_wait sysTid=24018 state= do_epoll_wait sysTid=24019 state= do_epoll_wait sysTid=24021 state= futex_wait_queue sysTid=24034 state= futex_wait_queue sysTid=24039 state= futex_wait_queue sysTid=24056 state= do_epoll_wait sysTid=24061 state= do_epoll_wait sysTid=24063 state= do_epoll_wait sysTid=24065 state= do_epoll_wait sysTid=24070 state= futex_wait_queue sysTid=24078 state= futex_wait_queue sysTid=24081 state= futex_wait_queue sysTid=24084 state= futex_wait_queue sysTid=24087 state= futex_wait_queue sysTid=24089 state= futex_wait_queue sysTid=24095 state= do_epoll_wait sysTid=24106 state= futex_wait_queue sysTid=24107 state= futex_wait_queue sysTid=24111 state= futex_wait_queue sysTid=24135 state= futex_wait_queue sysTid=24140 state= futex_wait_queue sysTid=24142 state= futex_wait_queue sysTid=24144 state= __skb_wait_for_more_packets sysTid=24145 state= futex_wait_queue sysTid=24171 state= futex_wait_queue sysTid=24172 state= futex_wait_queue sysTid=24173 state= futex_wait_queue sysTid=24174 state= __skb_wait_for_more_packets sysTid=24175 state= futex_wait_queue sysTid=24179 state= futex_wait_queue sysTid=24177 state= futex_wait_queue sysTid=24186 state= futex_wait_queue sysTid=24189 state= do_epoll_wait sysTid=24201 state= __skb_wait_for_more_packets sysTid=24252 state= do_epoll_wait sysTid=24254 state= do_epoll_wait sysTid=24256 state= do_epoll_wait sysTid=24274 state= futex_wait_queue sysTid=24281 state= binder_thread_read sysTid=24282 state= binder_thread_read sysTid=24283 state= binder_thread_read sysTid=24284 state= 0 sysTid=24288 state= futex_wait_queue sysTid=24289 state= futex_wait_queue sysTid=24290 state= futex_wait_queue sysTid=24350 state= futex_wait_queue sysTid=24351 state= futex_wait_queue sysTid=24352 state= futex_wait_queue sysTid=24358 state= futex_wait_queue sysTid=24410 state= futex_wait_queue sysTid=24431 state= futex_wait_queue sysTid=24436 state= futex_wait_queue sysTid=24447 state= futex_wait_queue sysTid=24450 state= futex_wait_queue sysTid=24457 state= futex_wait_queue sysTid=24464 state= futex_wait_queue sysTid=24474 state= futex_wait_queue sysTid=24473 state= futex_wait_queue sysTid=24476 state= do_epoll_wait sysTid=24477 state= futex_wait_queue sysTid=24510 state= futex_wait_queue sysTid=24523 state= futex_wait_queue sysTid=24619 state= binder_thread_read sysTid=24622 state= futex_wait_queue sysTid=24630 state= futex_wait_queue sysTid=24640 state= do_sys_poll sysTid=24645 state= futex_wait_queue sysTid=24664 state= futex_wait_queue sysTid=24669 state= futex_wait_queue sysTid=24670 state= futex_wait_queue sysTid=24683 state= 0 sysTid=24686 state= 0 sysTid=24687 state= futex_wait_queue sysTid=24688 state= futex_wait_queue sysTid=24691 state= futex_wait_queue sysTid=24693 state= futex_wait_queue sysTid=24714 state= futex_wait_queue sysTid=24723 state= futex_wait_queue sysTid=24749 state= vm_mmap_pgoff sysTid=24750 state= futex_wait_queue sysTid=24751 state= futex_wait_queue sysTid=24754 state= futex_wait_queue sysTid=24755 state= futex_wait_queue sysTid=24756 state= futex_wait_queue sysTid=24762 state= futex_wait_queue sysTid=24767 state= futex_wait_queue sysTid=24768 state= futex_wait_queue sysTid=24772 state= futex_wait_queue sysTid=24788 state= futex_wait_queue sysTid=24793 state= futex_wait_queue sysTid=24797 state= futex_wait_queue sysTid=24801 state= futex_wait_queue sysTid=24802 state= futex_wait_queue sysTid=24807 state= futex_wait_queue sysTid=24812 state= futex_wait_queue sysTid=24813 state= mmap_read_lock_killable sysTid=24814 state= futex_wait_queue sysTid=24815 state= futex_wait_queue sysTid=24816 state= futex_wait_queue sysTid=24817 state= futex_wait_queue sysTid=24820 state= futex_wait_queue sysTid=24821 state= futex_wait_queue sysTid=24825 state= futex_wait_queue sysTid=24827 state= futex_wait_queue sysTid=24829 state= futex_wait_queue sysTid=24832 state= futex_wait_queue sysTid=24833 state= futex_wait_queue sysTid=24834 state= futex_wait_queue sysTid=24835 state= futex_wait_queue sysTid=24840 state= futex_wait_queue sysTid=24841 state= do_madvise sysTid=24843 state= futex_wait_queue sysTid=24844 state= futex_wait_queue sysTid=24845 state= futex_wait_queue sysTid=24846 state= futex_wait_queue sysTid=24870 state= futex_wait_queue sysTid=24875 state= futex_wait_queue sysTid=24879 state= futex_wait_queue sysTid=24880 state= futex_wait_queue sysTid=24881 state= do_madvise sysTid=24883 state= 0 sysTid=24887 state= 0 sysTid=24889 state= futex_wait_queue sysTid=24890 state= pipe_read sysTid=24899 state= futex_wait_queue sysTid=24900 state= futex_wait_queue sysTid=24901 state= futex_wait_queue sysTid=24902 state= futex_wait_queue sysTid=24903 state= futex_wait_queue sysTid=24904 state= futex_wait_queue sysTid=24905 state= futex_wait_queue sysTid=24906 state= futex_wait_queue sysTid=24907 state= futex_wait_queue sysTid=24908 state= futex_wait_queue sysTid=24909 state= futex_wait_queue sysTid=24911 state= 0 sysTid=24912 state= futex_wait_queue sysTid=24913 state= futex_wait_queue sysTid=24915 state= futex_wait_queue sysTid=24916 state= futex_wait_queue sysTid=24918 state= futex_wait_queue sysTid=24927 state= futex_wait_queue sysTid=24928 state= futex_wait_queue sysTid=24940 state= futex_wait_queue ----- end 18951 -----，能够看出来应用为什么会发生anr吗？
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