MPIX_Async_get_state(3)

💖 MPIX_Async_get_state(3) 💖

okay bestie, welcome to the MPI corner of the man pages, this one's about MPIX_Async_get_state and no cap it's a short one but we're gonna make it cute anyway ✨

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🌸 NAME 🌸

MPIX_Async_get_state — [short description]

(yes literally, that's what the page says, the short description slot is a whole mood of its own rn 😭)

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🎀 SYNOPSIS 🎀

void * MPIX_Async_get_state(MPIX_Async_thing async_thing)

okay so it hands you back a void *. that's it, that's the whole thing 💅

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✨ INPUT PARAMETERS ✨

• async_thing — the opaque pointer for the async thing (default: None). opaque means don't go peeking inside it, bestie, it's not for you 🙈

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🔥 THREAD AND INTERRUPT SAFETY 🔥

good news: this routine is thread-safe 👑 which means multiple threads can call it at the same time with zero user-provided thread locks needed. go off, threads. no gatekeeping here.

but not interrupt safe. and why? typically it's the memory allocation situation — stuff like malloc or other non-MPICH runtime routines that are themselves not interrupt-safe. so like, thread-safe yes, interrupt-safe no, don't mix those two vibes up 🫶

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🦋 NOTES FOR FORTRAN 🦋

every MPI routine in Fortran (except for MPI_WTIME and MPI_WTICK) gets a bonus extra argument called ierr tacked on at the end of the argument list. ierr is an integer and it means the exact same thing as the return value of the routine in C. in Fortran land, MPI routines are subroutines, and you invoke them with the call statement. iconic, honestly.

also, all MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran. remember that for the quiz 🍓

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💀 ERRORS 💀

all MPI routines (except MPI_Wtime and MPI_Wtick) return an error value — C routines as the value of the function, Fortran routines in that last argument we just talked about.

before the value comes back to you, the current MPI error handler gets called. and by default? this error handler aborts the MPI job. like, full stop, whole job, gone. so if you're wondering why your program dipped, it might be this 😭

the error handler can be changed 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 be used but its use is deprecated (respectfully, don't, it's giving legacy).

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

⚠️ heads up: MPI does not guarantee that an MPI program can continue past an error. however, MPI implementations will attempt to continue whenever possible. so like... they'll try. but there's no promise. vibe check accordingly.

here are the error codes:

• MPI_SUCCESS — no error; the MPI routine completed successfully. slay ✨
• MPI_ERR_OTHER — other error; use MPI_Error_string to get more information about this error code. when in doubt, ask MPI_Error_string, it always knows 💜

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and that's the whole page, bestie! no SEE ALSO section here, it's a solo act 💅

later, legend — this was MPIX_Async_get_state(3) from the MPI manual, dated 4/10/2026. go get that state, main character 🌈💖