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Add buf_ring_full utility function, make sure dequeue/enqueue see the latest

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kmacy 2008-01-13 22:37:09 +00:00
parent 1c6521cfbb
commit 09452a19b0
1 changed files with 10 additions and 2 deletions
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12
sys/dev/cxgb/cxgb_osdep.h
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@ -203,6 +203,12 @@ buf_ring_empty(struct buf_ring *mr)
return (mr->br_cons == mr->br_prod); return (mr->br_cons == mr->br_prod);
} }
static __inline int
buf_ring_full(struct buf_ring *mr)
{
return (mr->br_cons == (mr->br_prod + 1));
}
/* /*
* The producer and consumer are independently locked * The producer and consumer are independently locked
* this relies on the consumer providing his own serialization * this relies on the consumer providing his own serialization
@ -217,6 +223,7 @@ buf_ring_dequeue(struct buf_ring *mr)
ring = (caddr_t *)mr->br_ring; ring = (caddr_t *)mr->br_ring;
mask = mr->br_size - 1; mask = mr->br_size - 1;
cons = mr->br_cons; cons = mr->br_cons;
mb();
prod = mr->br_prod; prod = mr->br_prod;
m = NULL; m = NULL;
if (cons != prod) { if (cons != prod) {
@ -234,9 +241,10 @@ __buf_ring_enqueue(struct buf_ring *mr, void *m)
int prod, cons, mask, err; int prod, cons, mask, err;
cons = mr->br_cons;
prod = mr->br_prod;
mask = mr->br_size - 1; mask = mr->br_size - 1;
prod = mr->br_prod;
mb();
cons = mr->br_cons;
if (((prod + 1) & mask) != cons) { if (((prod + 1) & mask) != cons) {
mr->br_ring[prod] = m; mr->br_ring[prod] = m;
mb(); mb();