63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/*
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* example_spinlock.c
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/spinlock.h>
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static DEFINE_SPINLOCK(sl_static);
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static spinlock_t sl_dynamic;
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static void example_spinlock_static(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&sl_static, flags);
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pr_info("已锁定静态自旋锁\n");
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/* 执行一些安全的操作。由于这会占用 100% 的 CPU 时间，
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* 这段代码应该运行时间不超过几毫秒。
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*/
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spin_unlock_irqrestore(&sl_static, flags);
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pr_info("已解锁静态自旋锁\n");
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}
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static void example_spinlock_dynamic(void)
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{
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unsigned long flags;
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spin_lock_init(&sl_dynamic);
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spin_lock_irqsave(&sl_dynamic, flags);
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pr_info("已锁定动态自旋锁\n");
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/* 执行一些安全的操作。由于这会占用 100% 的 CPU 时间，
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* 这段代码应该运行时间不超过几毫秒。
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*/
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spin_unlock_irqrestore(&sl_dynamic, flags);
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pr_info("已解锁动态自旋锁\n");
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}
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static int __init example_spinlock_init(void)
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{
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pr_info("自旋锁示例启动\n");
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example_spinlock_static();
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example_spinlock_dynamic();
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return 0;
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}
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static void __exit example_spinlock_exit(void)
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{
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pr_info("自旋锁示例退出\n");
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}
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module_init(example_spinlock_init);
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module_exit(example_spinlock_exit);
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MODULE_DESCRIPTION("自旋锁示例");
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MODULE_LICENSE("GPL");
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