Asynchronous callback driven messaging request completion notification

A computer-readable non-transitory storage medium configured with data and with instructions that when executed cause processor(s) to perform a process for asynchronous callback driven messaging request completion notification, the process comprising the steps of:

• a user-mode thread making a non-blocking request to a message passing interface library;
• associating a callback routine with the request as an asynchronous callback to the thread;
• and
• queueing the callback routine for execution by the thread which made the non-blocking request.

A computer system comprising:

• at least one logical processor, each logical processor in operable communication with a memory;
• at least two threads residing in the memory;
• an MPI messaging request residing in the memory and having a requesting thread identifier which identifies one of the threads, the messaging request also having a completion indicator configured to indicate whether the messaging request has completed;
• and
• an asynchronous callback residing in the memory and having a deterministic thread callback context which associates the callback with the thread identified in the messaging request, thereby determining the thread in which the callback will execute.