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Expose sx_xholder() as a public macro. It returns a pointer to the thread

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that holds the current exclusive lock, or NULL if no thread holds an
exclusive lock.

Requested by:	pjd
This commit is contained in:
John Baldwin 2007-05-19 20:18:12 +00:00
parent 7229ab21b7
commit 71a95881d4
2 changed files with 8 additions and 8 deletions
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8
sys/kern/kern_sx.c
View File

@ -101,14 +101,6 @@ __FBSDID("$FreeBSD$");
*/
#define sx_recursed(sx) ((sx)->sx_recurse != 0)
/*
* Return a pointer to the owning thread if the lock is exclusively
* locked.
*/
#define sx_xholder(sx) \
((sx)->sx_lock & SX_LOCK_SHARED ? NULL : \
(struct thread *)SX_OWNER((sx)->sx_lock))
#ifdef DDB
static void db_show_sx(struct lock_object *lock);
#endif

8
sys/sys/sx.h
View File

@ -213,6 +213,14 @@ struct sx_args {
#define sx_try_upgrade(sx) _sx_try_upgrade((sx), LOCK_FILE, LOCK_LINE)
#define sx_downgrade(sx) _sx_downgrade((sx), LOCK_FILE, LOCK_LINE)
/*
* Return a pointer to the owning thread if the lock is exclusively
* locked.
*/
#define sx_xholder(sx) \
((sx)->sx_lock & SX_LOCK_SHARED ? NULL : \
(struct thread *)SX_OWNER((sx)->sx_lock))
#define sx_xlocked(sx) \
(((sx)->sx_lock & ~(SX_LOCK_FLAGMASK & ~SX_LOCK_SHARED)) == \
(uintptr_t)curthread)