MPI_Type_toint(3)

💅 MPI_Type_toint(3) — the MPI girlies' guide

okay bestie, welcome to the MPI manual, section 3, and today's main character is MPI_Type_toint(3) 🩷 she's a lil function with one job and she does it flawlessly.

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✨ NAME ✨

MPI_Type_toint — converts MPI_Type to an integer handle 🎀

like. that's it. that's the whole vibe. no cap.

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🌸 SYNOPSIS 🌸

int MPI_Type_toint(MPI_Datatype datatype)

look at her. one parameter. zero drama. iconic behavior fr fr 💅

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🦋 INPUT PARAMETERS 🦋

• datatype — the datatype (handle) 💖 hand it over, she'll take it from here.

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👑 THREAD AND INTERRUPT SAFETY 👑

okay so this part is important and I need you to actually read it, bestie 🫶

This routine is thread-safe. Which means — literally, no cap — multiple threads can use it at the same time, all safe and sound, and you do not need to bring your own user-provided thread locks. no mutexes, no gatekeeping, she handles it herself ✨

BUT. and this is the part where I grab you by the shoulders 😭 — the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe 💀 so like... thread-safe = yes, interrupt-safe = absolutely not, and that's just how it is.

⚠️ real talk: not interrupt safe. malloc and friends, plus other non-MPICH runtime routines, are the usual suspects — and those are not interrupt-safe either. respect the caveat or get got.

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🌈 that's the whole page 🌈

no hidden options, no secret flags, no plot twists. she's a small, honest, hardworking little function and we love her for it 🍓

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sign-off time 💜 this lil cutie lives in the MPI manual pages (section 3, obviously, iykyk), and the page was stamped 4/10/2026 — so if you're reading this, hey, hi, you're doing amazing, now go convert that type handle 🧚✨💖