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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 1

lock_islocked Kernel Service


Tests whether a complex lock is locked.


#include <sys/lock_def.h>
int lock_islocked (lock_addr)
complex_lock_t lock_addr;


lock_addr Specifies the address of the lock word to test.


The lock_islocked kernel service determines whether the specified complex lock is free, or is locked in either shared-read or exclusive-write mode.

Execution Environment

The lock_islocked kernel service can be called from the process environment only.

Return Values

TRUE Indicates that the lock was locked.
FALSE Indicates that the lock was free.

Implementation Specifics

The lock_islocked kernel service is part of the Base Operating System (BOS) Runtime.

Related Information

The lock_init kernel service.

Understanding Locking and Locking Kernel Services in AIX Kernel Extensions and Device Support Programming Concepts

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