SLEEP_LOCKAVAIL(D3)SLEEP_LOCKAVAIL(D3)NAMESLEEP_LOCKAVAIL - query whether a sleep lock is available
SYNOPSIS
#include <sys/types.h>
#include <sys/ksynch.h>
#include <sys/ddi.h>
boolean_t SLEEP_LOCKAVAIL(sleep_t *lockp);
Arguments
lockp Pointer to the sleep lock to be queried.
DESCRIPTIONSLEEP_LOCKAVAIL returns an indication of whether the sleep lock specified
by lockp is currently available.
Return Values
SLEEP_LOCKAVAIL returns TRUE (a non-zero value) if the lock was available
or FALSE (zero) if the lock was not available.
USAGE
The state of the lock may change and the value returned may no longer be
valid by the time the caller sees it. The caller is expected to
understand that this is ``stale data'' and is either using it as a
heuristic or has arranged for the return value to be meaningful by other
means.
Level
Base or Interrupt.
Synchronization Constraints
Does not sleep.
Driver-defined basic locks, read/write locks, and sleep locks may be held
across calls to this function.
REFERENCESSLEEP_ALLOC(D3), SLEEP_DEALLOC(D3), SLEEP_LOCK(D3), SLEEP_LOCK_SIG(D3),
SLEEP_TRYLOCK(D3), SLEEP_UNLOCK(D3)
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