= jb_finalize =

== Name ==

//jb_finalize// - terminates the JBRT environment.

== Synopsis ==

{{{
#include "jbcnl.h";

void jb_finalize( void);
}}}

Include with //-I/bgsys/local/bgas/jbrt/jbcn/include//, link with //-L/bgsys/local/bgas/jbrt/jbcn/lib -ljbcn//.

== Description ==

//jb_finalize()// deallocates the shared memory buffers used by the JBCNL and triggers termination of the JBRT's IO node infrastructure and reaping of any remaining IO node user processes. //jb_finalize()// shall be called at the end of the compute node application to ensure proper IO node cleanup.

No JBCNL functions must be called after //jb_finalize()//; doing so results in undefined behaviour.

//jb_finalize()// uses a global MPI barrier for synchronization before performing any cleanup operations; therefore, it is a globally blocking call and must furthermore be called before //MPI_Finalize()//. This is to ensure that the JBSD shutdown is not triggered while other MPI tasks are still communicating with the IO node.

As for //MPI_Finalize()//, //jb_finalize()// is not thread-safe and must be called by one thread only (though this thread does not necessarily have to be the one which called //jb_init()//).

== Return value ==

//jb_finalize()// does not return a value and does not set "errno".