MPI_Op_toint(3)

💖 MPI_Op_toint 💖

okay bestie, welcome to the MPI_Op_toint page, straight outta the MPI manual (section 3, iykyk) ✨

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🌸 NAME 🌸

MPI_Op_toint — converts MPI_Op to an integer handle 🪄

like. it takes your fancy little op object and hands you back a plain int. that's the whole gig. iconic behavior honestly 💅

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🎀 SYNOPSIS 🎀

int MPI_Op_toint(MPI_Op op)

there she is. one function, one argument, one int coming back to you 🫶

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🦋 INPUT PARAMETERS 🦋

• op — the op, as a handle. that's it, that's the input 🍓

ngl this section is short but we love her anyway.

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✨ THREAD AND INTERRUPT SAFETY ✨

okay so this is the part where we get serious for a sec, because it's lowkey important 👑

This routine is thread-safe. which means: multiple threads can call it at the same time and nobody needs to bring their own thread locks, no user-provided locking required, we're chilling 😌✨

BUT. and this is the big BUT bestie. the routine is not interrupt safe. 😭

and why? typically because of memory allocation routines — think malloc, or other non-MPICH runtime routines — that are themselves not interrupt-safe. so the interrupt-safety vibe check is a fail, no cap. 💀

so: threads? slay. interrupts? absolutely not. 🙈

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this has been the MPI_Op_toint page, brought to you by MPI, dated 4/10/2026, and yeah the footer says MPI_Op_toint(3) again because the manpage said so and I respect the manpage 💜

go forth and convert those handles, bestie 🧚🌈⭐