Mirrors_BOOKS/LDD-LinuxDeviceDrivers
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内核同步机制...

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gatieme committed 2017-05-10 12:44:46 +08:00
1 parent 2daf9de82c
commit dc4ee150b1
1 file changed
+13 -12
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study/kernel/07-sync/00-code/01-atomic/hello.c
+13 -12
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@@ -1,8 +1,9 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/atomic.h>
#include <asm/atomic.h>
//#include <linux/list.h>
//#include <linux/mm.h>
//#include <linux/mm_types.h>
@@ -18,23 +19,23 @@ atomic_t count = ATOMIC_INIT(1);
static int hello_init(void)
{
printk("init : %d\n", atomic_read(count));
printk("init : %d\n", atomic_read(&count));
atomic_set(count, 2);
printk("set2 : %d\n", atomic_read(count));
atomic_set(&count, 2);
printk("set2 : %d\n", atomic_read(&count));
atomic_add(count, 3);
printk("add3 : %d\n", atomic_read(count));
atomic_add(3, &count);
printk("add3 : %d\n", atomic_read(&count));
atomic_sub(count);
printk("sub3 : %d\n", atomic_read(count));
atomic_sub(3, &count);
printk("sub3 : %d\n", atomic_read(&count));
atomic_inc(count);
printk("inc : %d\n", atomic_read(count));
atomic_inc(&count);
printk("inc : %d\n", atomic_read(&count));
atomic_dec(count);
printk("dev : %d\n", atomic_read(count));
atomic_dec(&count);
printk("dev : %d\n", atomic_read(&count));
return 0;
}