shmlkinit


>>-shmlkinit--address--locktokenvar--+----------------------------------------------------+-><
                                     '-exclusive--+-------------------------------------+-'   
                                                  '-shared--+-------------------------+-'     
                                                            '-deadlock--+-----------+-'       
                                                                        '-recursive-'

Function

shmlkinit initializes a shared memory lock.

Parameters

address

The address of a lock word in a shared memory segment. The lock word must be in 4-byte hexadecimal format.

locktokvar

The variable where a lock token is returned.

exclusive

0: The lock cannot be obtained with the shared attribute. A lock that is obtained with the shared attribute can be obtained concurrently by other callers requesting a shared lock obtain.
1: Can be obtained with the shared attribute. This is the default.

deadlock

0: Deadlocks are not detected.
1: Deadlocks are detected. This is the default.

recursive

0: Recursive obtains are not allowed. This is the default.
1: Recursive obtains are allowed.

Example

'shmlkinit shmaddr lk'