MPI_Session_toint(3)

💖 MPI_Session_toint(3) 💖

okay bestie, welcome to the MPI corner of the man pages 🌸 this one's a lil baby page but it's IMPORTANT so let's get into it, no cap.

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✨ NAME ✨

MPI_Session_toint — converts an MPI_Session to an integer handle 🎀

like. it takes your fancy session object and turns it into a plain ol' integer so you can yeet it around your own code. it's giving translator. it's giving glow-up-from-handle-to-int 💅

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✨ SYNOPSIS ✨

int MPI_Session_toint(MPI_Session session)

that's it. that's the whole function signature. one argument, returns an int. iconic behaviour honestly ✨

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✨ INPUT PARAMETERS ✨

• session — the session (it's a handle 🫶)

bestie it's a handle. you pass it in. that's the vibe.

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✨ THREAD AND INTERRUPT SAFETY ✨

okay this part matters so listen up 🧚

• This routine is thread-safe 💖✨ which means it can be safely used by multiple threads at the same time, and you do not need any user-provided thread locks. no mutexes, no semaphores, no stress. slay.
• But this routine is NOT interrupt safe 😭💀 keep that in mind!! Typically this is because it uses memory allocation routines like malloc, or other non-MPICH runtime routines, that are themselves not interrupt-safe. so like, the interrupt-safety is inherited from the allocation squad and they are not interrupt-safe, periodt.

so: multiple threads? fine, go off 👑. interrupts? do not. that's the vibe check.

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and that's the whole page!! short and sweet, just like a good group chat message 💜

later bestie, stay safe out there and remember: thread-safe ✅, interrupt-safe ❌ 🦋

MPI · page dated 4/10/2026 · MPI_Session_toint(3) 💖 bye bye!! 🎀✨