| Allegro CL version 10.1 This page is new in 10.1. | ||||||||||
Arguments: sharable-lock &optional modifier whostate
This page was inadvertantly left out of the original sharable lock documentation.
The method defined when the first argument is a sharable-lock instance examines the state of the
lock and returns t if the lock is idle, or
nil if it is not. The optional arguments add
some additional behavior.
| modifier | whostate | Behavior |
nil |
[ignored] | Test the lock and return immediately. |
n <= 0 |
[ignored] | Test the lock and return immediately. |
n > 0 |
A string, will be the whostate while waiting. Default is "sharable-lock-idle-p" in modern Lisps and "SHARABLE-LOCK-IDLE-P" in ANSI Lisps. | Test the lock, and if not idle, wait
at most n seconds. n may be
any real number. |
:show |
[ignored] | Print messages detailing the lock
state, and return t or
nil. |
:show-if-not |
[ignored] | Like :show but
print details only if the lock is
not idle. |
:wait |
A string, will be the whostate while waiting. Default is "sharable-lock-idle-p" in modern Lisps and "SHARABLE-LOCK-IDLE-P" in ANSI Lisps. | Test the lock and, if not idle, wait indefinitely until it is idle. |
Other
non-nil |
[ignored] | Test the lock and return immediately. |
As in all cases where objects may be modified by multiple threads, the returned value is obsolete the moment it is returned.
See Sharable locks in smp.htm.
See multiprocessing.htm for general information on multiprocessing in Allegro CL.
Copyright (c) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.
This page is new in the 10.1 release.
Created 2019.8.20.
| Allegro CL version 10.1 This page is new in 10.1. | ||||||||||