3rd-party/linux-kernel-module-cheat
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waitqueue example works, kthread_uniterruptible completely wrong and renamed to schedule, params added

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This commit is contained in:
Ciro Santilli
2017-06-05 14:53:00 +01:00
parent 0d9fd5b2ca
commit 709d01e513
5 changed files with 125 additions and 55 deletions
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30
kernel_module/wait_queue.c
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@@ -1,5 +1,8 @@
/*
TODO get working. Thread 2 only wakes up once! Wake thread 2 up every 2 seconds from thread 1.
"wait_event" works a bit like:
if (!cond)
sleep_until_event
*/
#include <linux/delay.h> /* usleep_range */
@@ -12,20 +15,17 @@ MODULE_LICENSE("GPL");
static struct task_struct *kthread1, *kthread2;
static wait_queue_head_t queue;
static int awake = 0;
static atomic_t awake = ATOMIC_INIT(0);
static int kthread_func1(void *data)
{
int i = 0;
unsigned int i = 0;
while (!kthread_should_stop()) {
awake = !awake;
pr_info("1 %d\n", i);
wake_up_interruptible(&queue);
schedule();
pr_info("1 %u\n", i);
usleep_range(1000000, 1000001);
atomic_set(&awake, 1);
wake_up(&queue);
i++;
if (i == 10)
i = 0;
}
i = !i;
wake_up_interruptible(&queue);
@@ -35,15 +35,13 @@ static int kthread_func1(void *data)
static int kthread_func2(void *data)
{
set_current_state(TASK_INTERRUPTIBLE);
int i = 0;
unsigned int i = 0;
while (!kthread_should_stop()) {
wait_event(queue, awake);
pr_info("2 %d\n", i);
set_current_state(TASK_INTERRUPTIBLE);
schedule();
pr_info("2 %u\n", i);
i++;
if (i == 10)
i = 0;
wait_event(queue, atomic_read(&awake));
atomic_set(&awake, 0);
schedule();
}
return 0;
}