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non-trivial functions
This commit is contained in:
kmacy 2009-05-07 19:57:14 +00:00
parent fa0fd85038
commit 35d0919f73
1 changed files with 13 additions and 4 deletions
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17
sys/sys/buf_ring.h
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@ -1,6 +1,6 @@
/**************************************************************************
*
* Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
* Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -69,7 +69,10 @@ struct buf_ring {
void *br_ring[0];
};
/*
* multi-producer safe lock-free ring buffer enqueue
*
*/
static __inline int
buf_ring_enqueue(struct buf_ring *br, void *buf)
{
@ -169,8 +172,9 @@ buf_ring_dequeue_mc(struct buf_ring *br)
}
/*
* Single-Consumer dequeue for uses where dequeue
* is protected by a lock
* single-consumer dequeue
* use where dequeue is protected by a lock
* e.g. a network driver's tx queue lock
*/
static __inline void *
buf_ring_dequeue_sc(struct buf_ring *br)
@ -208,6 +212,11 @@ buf_ring_dequeue_sc(struct buf_ring *br)
return (buf);
}
/*
* return a pointer to the first entry in the ring
* without modifying it, or NULL if the ring is empty
* race-prone if not protected by a lock
*/
static __inline void *
buf_ring_peek(struct buf_ring *br)
{