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Lesson 10 homework #115

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Lesson 10 homework #115

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2a23c68
kthread example: add example that creates and stops thread
vad32m Dec 19, 2018
32bd4a6
kthread example: implement multiple logger threads
vad32m Dec 19, 2018
221bb0a
kthread example: add spinlock and critical section into logger thread
vad32m Dec 19, 2018
c9191a7
kthread example: replace spinlock with rt-mutex
vad32m Dec 19, 2018
5379dd1
kthread example: moved files to correct solution folder
vad32m Dec 21, 2018
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13 changes: 7 additions & 6 deletions kthread_example/kthread_module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,21 +6,22 @@
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/rtmutex.h>

#define N_THR 4

static struct task_struct *threads[N_THR];

DEFINE_SPINLOCK(critical_section);
DEFINE_RT_MUTEX(critical_section);

static int thread_fn(void *ptr)
{

while (!kthread_should_stop()) {
pr_info("Kthread example: in thread %d\n", (int)ptr);
spin_lock(&critical_section);
msleep_interruptible(200);
spin_unlock(&critical_section);
rt_mutex_lock(&critical_section);
msleep_interruptible(200);
rt_mutex_unlock(&critical_section);
msleep_interruptible(800);
}

Expand All @@ -35,8 +36,8 @@ int thread_init(void)
pr_info("Kthread example: in init\n");

for (i = 0; i < N_THR; i++)
threads[i] = kthread_run(thread_fn,
(void *)i, thread_format, i);
threads[i] = kthread_run(thread_fn,
(void *)i, thread_format, i);
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Insignificant changes


return 0;
}
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