大概的思路: 生成timer_list结构体并初始化,然后用add_timer注册刚才初始化的timer,等expire时间到后就调用callback回调函数!思路很简单,从这里能看到核心的函数时add_timer和mod_timer函数,而这两个函数最终都调用了__mod_timer函数;从函数的源码看,用的都是队列来组织timer的,传说中的红黑树了? 上面的这些定时...
__init_timer((timer), (callback), (flags)) #define timer_setup_on_stack(timer, callback, flags) \ __init_timer_on_stack((timer), (callback), (flags)) void add_timer(struct timer_list *timer); void add_timer_on(struct timer_list *timer, int cpu); int mod_timer(struct timer_...
drivers/rtc/rtc-dev.c 以及其调用的drivers/rtc/interface.c 等 RTC 核心层相当于把 file_operations 中的 open()、release()、读取和设置时间等,都间接 “转发” 给了底层的实例。如下摘取部分 RTC 核心层调用具体底层驱动 callback 的过程: 1)open: /* 文件 drivers/rtc/rtc-dev.c 中: */ static int...
register_chrdev_region(ap3216cdev.devid, AP3216C_CNT, AP3216C_NAME); } else { alloc_chrdev_region(&ap3216cdev.devid, 0, AP3216C_CNT, AP3216C_NAME); ap3216cdev.major = MAJOR(ap3216cdev.devid); } /* 2、注册设备 */ cdev_init(&ap3216cdev.cdev, &ap3216c_ops); cdev_add(&ap...
--- - name: Manage local storage hosts: managed-node-01.example.com tasks: -name: Create and mount a file system ansible.builtin.include_role: name: redhat.rhel_system_roles.storage vars: storage_volumes: - name: barefs type: disk disks: - sdb fs_type: ext4 fs_label: label-...
/* 进行音频采集,采集pcm数据并直接保存pcm数据 音频参数: 声道数: 1 采样位数: 16bit、LE格式 采样频率: 44100Hz 运行示例: $ gcc linux_pcm_save.c -lasound $ ./a.out hw:0 123.pcm */ #include <stdio.h> #include <stdlib.h> #include <alsa/asoundlib.h> #include <signal.h> #define Aud...
alarmtimer.h alcor_pci.h align.h alloc_tag.h altera_jtaguart.h altera_uart.h amd-iommu.h amd-pmf-io.h anon_inodes.h aperture.h apm-emulation.h apm_bios.h apple-gmux.h arch_topology.h args.h arm-cci.h arm-smccc.h arm_ffa.h arm_sdei.h armada-37xx-rwtm-mailbox.h array_...
Back up the configurations off the switch. Download the Cumulus Linux image. Install the Cumulus Linux image with the onie-install -a -i <image-location> command, which boots the switch into ONIE. The following example command installs the image from a web server, then reboots the switch....
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# uname -a Linux rt-server.example.com kernel-rt-5.14.0-70.13.1.rt21.83.el9_0 … 注意 当系统收到次要更新(例如从 8.3 到 8.4)时,默认内核可能会自动从 Real Time 内核改回标准内核。 2.3. 配置默认内核 您可以配置默认引导内核。 流程 列出已安...