MPI_T_event_handle_set_info(3)

💖 MPI_T_event_handle_set_info — bestie edition 💖

okay so this page is MPI_T_event_handle_set_info(3) from the MPI manual, and it's literally about updating your event-registration handle's hints. that's it, that's the whole vibe. let's get into it 🫶

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✨ NAME ✨

MPI_T_event_handle_set_info — updates the hints of the event-registration handle associated with event_registration

like, you have an event registration, it has hints, and you're updating them. no drama, no cap. 💅

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✨ SYNOPSIS ✨

int MPI_T_event_handle_set_info(MPI_T_event_registration event_registration,
                                MPI_Info info)

she's compact, she's clean, she's serving function signature realness 🌸

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✨ INPUT PARAMETERS ✨

• event_registration — the event registration (handle) you're working with 🎀
• info — an info object (handle) 🦋

both of these are handles, okay? handles. don't come for me. 💜

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✨ THREAD AND INTERRUPT SAFETY ✨

good news first: this routine is thread-safe ✨ which means multiple threads can use it safely without you having to bring your own user-provided thread locks. she's low-maintenance like that 😌

bad news: she is NOT interrupt safe 💀 typically this is because of memory allocation routines like malloc, or other non-MPICH runtime routines, that are themselves not interrupt-safe. so like, respect the boundary. 🙈

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✨ ERRORS ✨

okay bestie, error-handling lore time. all MPI routines (except MPI_Wtime and MPI_Wtick) return an error value — C routines give it back as the value of the function, and Fortran routines put it in the last argument. before that value comes back, the current MPI error handler gets called. by default, that error handler aborts the MPI job. 😭

you can swap the error handler with:

• MPI_Comm_set_errhandler (for communicators)
• MPI_File_set_errhandler (for files)
• MPI_Win_set_errhandler (for RMA windows)

the MPI-1 routine MPI_Errhandler_set may also be used, but its use is deprecated — so like, she's retired, respect the retirement. 💅

the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned instead.

note that MPI does not guarantee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible. so she might survive it. no promises though 👑

here are the error codes, one by one, no skipping:

• MPI_SUCCESS — no error, the routine completed successfully 🎉
• MPI_ERR_INFO — invalid Info 🚫
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid 💀
• MPI_T_ERR_NOT_INITIALIZED — the MPI tool information interface is not initialized 😴
• MPI_ERR_OTHER — other error; use MPI_Error_string to get more information about this error code 🔍

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and that's the whole page, cover to cover, nothing skipped, nothing skipped bestie i checked twice 💖

this little dispatch came from the MPI manual and it's dated 4/10/2026, filed under MPI_T_event_handle_set_info(3) 🎀 stay safe out there, set those hints, and remember: thread-safe yes, interrupt-safe no. periodt. 💅✨🌈