Linux Kernel调度管理之唤醒指定进程

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于 2017-03-12 12:17:37 发布

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分类专栏： Linux Kernel 调度管理

本文链接：https://blog.youkuaiyun.com/sunlei0625/article/details/61450182

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本文介绍了一个用于唤醒指定进程并将其移至可运行进程集合的函数wake_up_process。该函数接收一个待唤醒进程作为参数，并尝试将该进程从睡眠状态唤醒。函数返回1表示成功唤醒，返回0则表示进程已经在运行中。此函数隐含了写内存屏障，在更改任务状态时确保内存可见性。

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/**
 * wake_up_process - Wake up a specific process
 * @p: The process to be woken up.
 *
 * Attempt to wake up the nominated process and move it to the set of runnable
 * processes.
 *
 * Return: 1 if the process was woken up, 0 if it was already running.
 *
 * It may be assumed that this function implies a write memory barrier before
 * changing the task state if and only if any tasks are woken up.
 */
int wake_up_process(struct task_struct *p)
{
	return try_to_wake_up(p, TASK_NORMAL, 0);
}
EXPORT_SYMBOL(wake_up_process);