我想迭代内核中的所有任务(线程和进程)并使用for_each_process宏打印tid / pid和name：
#define for_each_process(p) \
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
如何区分线程和进程？
所以我会像那样打印出来：
if (p->real_parent->pid == NULL)
printk("PROCESS: name: %s pid: %d \n",p->comm,p->pid);
else
printk("THREAD: name: %s tid: %d \n",p->pid);
解决方法
您需要以下宏：
/*
* Careful: do_each_thread/while_each_thread is a double loop so
* 'break' will not work as expected - use goto instead.
*/
#define do_each_thread(g,t) \
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
#define while_each_thread(g,t) \
while ((t = next_thread(t)) != g)
像这样使用它们：
rcu_read_lock();
do_each_thread(g,t) {
//...
} while_each_thread(g,t);
rcu_read_unlock();
