pwm_ops_check(chip->ops)) return -EINVAL; // 获取全局 pwm_lock 互斥锁 mutex_lock(&pwm_lock); // 为 chip 分配 PWM 设备索引号 ret = alloc_pwms(chip->base, chip->npwm); if (ret < 0) goto out; // 动态分配 chip->npwm 个 pwm_device 结构体 chip->pwms = kcalloc(chip->n...
mutex_lock(&dir->d_inode->i_mutex);// 更新路径的挂接点和dentry path.dentry = lookup_hash(nd); path.mnt = nd->mnt; __putname(nd->last.name); goto do_last;}4.2 path_lookup_open和path_lookup_create这两个函数找到路径名对应的挂接点和dentry结构, 赋值到nameidata结构中, create时如果文...
mutex_lock(&path->dentry->d_inode->i_mutex); if (cant_mount(path->dentry)) goto out_unlock; if (!d_unlinked(path->dentry)) err = attach_recursive_mnt(mnt, path, NULL); out_unlock: mutex_unlock(&path->dentry->d_inode->i_mutex); return err; } 该函数的处理也是首先检查挂载的有...
"88", "timer_wait": 0.06, "event_info": "sql/THD::LOCK_thd_queryn", "wait_info": "sql_class.cc:4320", "source": "sql_class.cc:4320", "event_type": "synch/mutex"}]} 1 row in set (0.00 sec) 9.ps_thread_trx_info 在performance_schema下的events_transactions_current、events_t...
WL#10314: InnoDB: Lock-sys optimization: sharded lock_sys mutex Affects: Server-8.0 —Status: Complete Description Requirements Dependent Tasks High Level Architecture Low Level Design The Lock-sys orchestrates access to tables and rows. Each table, and each row, can be thought of as a resource...
- void sys_mutex_unlock(sys_mutex_t *mutex) Releases the mutex previously locked through 'sys_mutex_lock()'. - void sys_mutex_valid(sys_mutex_t *mutex) Returns 1 if the mutes is valid, 0 if it is not valid. When using pointers, a simple way is to check the pointer for != NULL...
当然如果是非auto_commit的select还是老老实实的释放走加锁释放。这是通过MVCC::view_close函数的第二参数来判定的。 而在分配的时候情况A下,只需要将m_closed设置为false就可以了,继续用这个read view就可以了。而对于情况B还是需要持有trx_sys->mutex的,因为这种情况不能复用了,但是read view存在也就直接初始化...
__d_lookup函数只是简单地根据名字从目录项缓存哈希链表中查找所需的目录项。d_lookup函数是对__d_lookup函数的加锁(读端顺序锁rename_lock)封装。__d_lookup_rcu函数的功能与__d_lookup函数一致,只是其采用的加锁方式不一样,且只能用于rcu-walk查找模式。源代码如下: /* fs/dcache.c */ struct dentry ...
lock:锁实现名称 "semaphore":使用信号的锁 "mutex_cond":使用互斥和条件变量的锁 None:锁信息未知 version:线程库的名称和版本。如果为None表示信息未知 sys.tracebacklimit 发生未处理的异常时,打印的回溯信息的最大层级。默认为1000。当设置为0或负数时,所有的回溯信息受到打印抑制,而只打印type和value ...
*/if((cmd==LINUX_REBOOT_CMD_POWER_OFF)&&!pm_power_off)cmd=LINUX_REBOOT_CMD_HALT;mutex_lock(&reboot_mutex);switch(cmd){caseLINUX_REBOOT_CMD_RESTART:kernel_restart(NULL);break;caseLINUX_REBOOT_CMD_CAD_ON:C_A_D=1;break;caseLINUX_REBOOT_CMD_CAD_OFF:C_A_D=0;break;caseLINUX_REBOOT_CMD...