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Add a sx_xlocked() macro which returns true if the current thread holds an

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exclusive lock on the specified sx lock.
This commit is contained in:
jhb 2006-06-21 20:38:29 +00:00
parent acb5f7e773
commit 23612f4028
1 changed files with 2 additions and 1 deletions
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3
sys/sys/sx.h
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@ -76,6 +76,7 @@ struct sx_args {
SYSUNINIT(name##_sx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
sx_destroy, (sxa))
#define sx_xlocked(sx) ((sx)->sx_cnt < 0 && (sx)->sx_xholder == curthread)
#define sx_slock(sx) _sx_slock((sx), LOCK_FILE, LOCK_LINE)
#define sx_xlock(sx) _sx_xlock((sx), LOCK_FILE, LOCK_LINE)
#define sx_try_slock(sx) _sx_try_slock((sx), LOCK_FILE, LOCK_LINE)
@ -85,7 +86,7 @@ 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)
#define sx_unlock(sx) do { \
if ((sx)->sx_cnt < 0) \
if (sx_xlocked(sx)) \
sx_xunlock(sx); \
else \
sx_sunlock(sx); \