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33 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
34 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
37 #ifndef _SYS_SOCKETVAR2_H_
38 #define _SYS_SOCKETVAR2_H_
40 #ifndef _SYS_SOCKETVAR_H_
41 #include <sys/socketvar.h>
44 #include <sys/systm.h>
46 #ifndef _SYS_MALLOC_H_
47 #include <sys/malloc.h>
49 #include <machine/atomic.h>
52 * Acquire a lock on a signalsockbuf, sleep if the lock is already held.
53 * The sleep is interruptable unless SSB_NOINTR is set in the ssb.
55 * We also acquire the token on success. This token is used to interlock
56 * frontend/backend operations until the sockbuf itself can be made mpsafe.
58 * Returns 0 on success, non-zero if the lock could not be acquired.
61 ssb_lock(struct signalsockbuf *ssb, int wf)
66 flags = ssb->ssb_flags;
68 if (flags & SSB_LOCK) {
70 return _ssb_lock(ssb);
73 if (atomic_cmpset_int(&ssb->ssb_flags, flags, flags|SSB_LOCK)) {
74 lwkt_gettoken(&ssb->ssb_token);
81 * Release a previously acquired lock on a signalsockbuf.
83 * Interlocked wakeup if SSB_WANT was also set.
86 ssb_unlock(struct signalsockbuf *ssb)
90 KKASSERT(ssb->ssb_flags & SSB_LOCK);
91 lwkt_reltoken(&ssb->ssb_token);
93 flags = ssb->ssb_flags;
95 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
96 flags & ~(SSB_LOCK | SSB_WANT))) {
98 wakeup(&ssb->ssb_flags);
105 sosetstate(struct socket *so, short state)
107 atomic_set_short(&so->so_state, state);
111 soclrstate(struct socket *so, short state)
113 atomic_clear_short(&so->so_state, state);
117 soreference(struct socket *so)
119 atomic_add_int(&so->so_refs, 1);