kentr(2) - Linux man page

Name

kenter - Enter process into LAM session.

C Synopsis

int kenter (char *name, int priority);

Fortran Synopsis

subroutine KENTR (name, priority, ierr)
character name*(*)
integer priority, ierr

Description

kenter() is the first function a LAM process must call to subsequently use LAM services. By calling underlying functions, kenter() accomplishes three important tasks. It initializes all relevant LAM data structures, particularly those for communication with the LAM daemon (see kinit(2)). It registers with the local LAM daemon and sets the message synchronizing priority (see kattach(2)). It also establishes a readable name by which the process can be remotely monitored and controlled (see lpattach(2)).

The name argument should be the name of the program (argv[0] is recommended) and becomes a convenient recognition string in the output of the state(1) command. It is not used for any type of synchronization.

Process Scheduling

LAM processes are scheduled by the host operating system. The priority argument determines which process will be synchronized first when many are blocked on the same message event and type (see ksend(2)). The highest priority process is always favoured.

The LAM daemon works like a server. By not replying to a message passing request, it can effectively block a process from running. The daemon will also attempt to preempt a running process when delivering a LAM signal (see kdoom(2)).

Errors

ENOKERNEL: LAM is not running on the local node.
ENOKDESCRIPTORS: The LAM daemon ran out of process descriptors.