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(root)/kernel/trunk/test/synch/rwlock4/test.c @ 1780 – Rev 205 → 225



__u32 random(__u32 max)
{
    __u32 rc;
    pri_t pri;
 
 
    spinlock_lock(&lock);  
    rc = seed % max;
    seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
    spinlock_unlock(&lock);
 
    return rc;
}
 
 
void writer(void *arg)

Rev 205	Rev 225
Line 60...	Line 60...
60	__u32 random(__u32 max)	60	__u32 random(__u32 max)
61	{	61	{
62	__u32 rc;	62	__u32 rc;
63	pri_t pri;	63	pri_t pri;
64		64
65	pri = cpu_priority_high();	-
66	spinlock_lock(&lock);	65	spinlock_lock(&lock);
67	rc = seed % max;	66	rc = seed % max;
68	seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;	67	seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
69	spinlock_unlock(&lock);	68	spinlock_unlock(&lock);
70	cpu_priority_restore(pri);	-
71	return rc;	69	return rc;
72	}	70	}
73		71
74		72
75	void writer(void *arg)	73	void writer(void *arg)