mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-13 20:12:26 +00:00
fd55d694c0
Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it breaks bisects at several points. All bugs will not bisect to this humongous change. It all started with a conversion of the Bash scripts to Python, mainly because I couldn't stand not being able to properly use --options for run which has a million options. Then since that required a full testing, I decided to do all the refactorings that I had in mind at once, and so I did and it became v2-rc. This is the largest patch I have ever done! OMG a few weeks of extra time. I'm never writing a Bash script for anything that starts getting big again. Some of the features are: * separate build-qemu and build-gem5 commands * common: convert scripts to python. Add --option for everything * rename build to build-buildroot now that we are splitting all the build commands, Linux kernel to follow * move all git submodules to submodules/ and all buildroot packages to packages/ * refactor the out/ structure. Keep projects on toplevel, because guest projects separate archs and host ones don't, making a toplevel arch wrong * do-release: rename to just release https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it * run: add --terminal and explain gem5 pdb * just track the lvimrc * store CLI kernel config fragment inside buildlroot to avoid conflicts * gem5: document m5 initparam * readme: make a bunch of things awesomer * readme: fix broken refs * parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c Could not fetch otherwise. * gem5: M5_OVERRIDE_PY_SOURCE
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#wait-queues */
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#include <linux/delay.h> /* usleep_range */
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/wait.h> /* wait_queue_head_t, wait_event_interruptible, wake_up_interruptible */
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static struct task_struct *kthread_wake;
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static struct task_struct *kthread_sleep1;
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static struct task_struct *kthread_sleep2;
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static wait_queue_head_t queue;
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static atomic_t awake1 = ATOMIC_INIT(0);
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static atomic_t awake2 = ATOMIC_INIT(0);
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static int kthread_wake_func(void *data)
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{
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unsigned int i = 0;
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while (!kthread_should_stop()) {
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pr_info("0 %u\n", i);
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usleep_range(1000000, 1000001);
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atomic_set(&awake1, 1);
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atomic_set(&awake2, 1);
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wake_up(&queue);
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i++;
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}
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return 0;
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}
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static int kthread_sleep_func_1(void *data)
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{
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unsigned int i = 0;
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while (!kthread_should_stop()) {
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pr_info("1 %u\n", i);
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i++;
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wait_event(queue, atomic_read(&awake1));
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atomic_set(&awake1, 0);
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schedule();
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}
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return 0;
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}
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static int kthread_sleep_func_2(void *data)
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{
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unsigned int i = 0;
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while (!kthread_should_stop()) {
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pr_info("2 %u\n", i);
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i++;
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wait_event(queue, atomic_read(&awake2));
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atomic_set(&awake2, 0);
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schedule();
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}
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return 0;
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}
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int init_module(void)
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{
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init_waitqueue_head(&queue);
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kthread_wake = kthread_create(kthread_wake_func, NULL, "wake");
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kthread_sleep1 = kthread_create(kthread_sleep_func_1, NULL, "sleep1");
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kthread_sleep2 = kthread_create(kthread_sleep_func_2, NULL, "sleep2");
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wake_up_process(kthread_wake);
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wake_up_process(kthread_sleep1);
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wake_up_process(kthread_sleep2);
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return 0;
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}
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void cleanup_module(void)
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{
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kthread_stop(kthread_sleep2);
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kthread_stop(kthread_sleep1);
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kthread_stop(kthread_wake);
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}
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MODULE_LICENSE("GPL");
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