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This commit is contained in:
Mark Johnston 2018-08-04 20:16:36 +00:00
parent d11ef379f0
commit e62ca80bde
1 changed files with 18 additions and 19 deletions
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37
sys/kern/uipc_usrreq.c
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@ -357,33 +357,32 @@ unp_pcb_lock2(struct unpcb *unp, struct unpcb *unp2)
}
static __noinline void
unp_pcb_owned_lock2_slowpath(struct unpcb *unp, struct unpcb **unp2p, int *freed)
unp_pcb_owned_lock2_slowpath(struct unpcb *unp, struct unpcb **unp2p,
int *freed)
{
struct unpcb *unp2;
unp2 = *unp2p;
unp_pcb_hold((unp2));
UNP_PCB_UNLOCK((unp));
UNP_PCB_LOCK((unp2));
UNP_PCB_LOCK((unp));
*freed = unp_pcb_rele((unp2));
unp_pcb_hold(unp2);
UNP_PCB_UNLOCK(unp);
UNP_PCB_LOCK(unp2);
UNP_PCB_LOCK(unp);
*freed = unp_pcb_rele(unp2);
if (*freed)
*unp2p = NULL;
}
#define unp_pcb_owned_lock2(unp, unp2, freed) do { \
freed = 0; \
UNP_PCB_LOCK_ASSERT((unp)); \
UNP_PCB_UNLOCK_ASSERT((unp2)); \
MPASS(unp != unp2); \
if (__predict_true(UNP_PCB_TRYLOCK((unp2)))) \
break; \
else if ((uintptr_t)(unp2) > (uintptr_t)(unp)) \
UNP_PCB_LOCK((unp2)); \
else { \
unp_pcb_owned_lock2_slowpath((unp), &(unp2), &freed); \
} \
#define unp_pcb_owned_lock2(unp, unp2, freed) do { \
freed = 0; \
UNP_PCB_LOCK_ASSERT(unp); \
UNP_PCB_UNLOCK_ASSERT(unp2); \
MPASS((unp) != (unp2)); \
if (__predict_true(UNP_PCB_TRYLOCK(unp2))) \
break; \
else if ((uintptr_t)(unp2) > (uintptr_t)(unp)) \
UNP_PCB_LOCK(unp2); \
else \
unp_pcb_owned_lock2_slowpath((unp), &(unp2), &freed); \
} while (0)