release a basic lock
void UNLOCK(lock_t *lockp, pl_t pl);
UNLOCK releases the basic lock specified by lockp and then
sets the interrupt priority level in accordance with the value
specified by pl (if required by the implementation).
Pointer to the basic lock to be released.
The interrupt priority level to be set after releasing the lock.
See the description of the min_pl argument on the
for a list of the valid values for pl.
If lock calls are not being nested or if the caller is unlocking in the
reverse order that locks were acquired, the pl argument will typically
be the value that was returned from the corresponding call to acquire the lock.
The caller may need to specify a different value for pl if nested locks
are released in some order other than the reverse order of acquisition, so as
to ensure that the interrupt priority level is kept sufficiently high to
block interrupt code that might attempt to acquire locks which are still held.
Although portable drivers must always specify an appropriate pl argument,
implementations which do not require that the interrupt priority level be
raised during lock acquisition may choose to ignore this argument.
Context and synchronization
Non-blockable, interrupt, user, or blockable
5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp
``Spin locks (DDI)'' in HDK Technical Reference
19 June 2005
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005