MPI_Session_c2f(3)

💖 NAME 💖

MPI_Session_c2f — bestie, this one converts an MPI_Session into a Fortran INTEGER. That's it, that's the whole job. ✨

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🎀 SYNOPSIS 🎀

MPI_Fint MPI_Session_c2f(MPI_Session session)

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🌸 INPUT PARAMETERS 🌸

• session — the session handle you're handing over, iykyk 🫶

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👑 THREAD AND INTERRUPT SAFETY 👑

Okay so this routine is thread-safe, and that's not a vibe, that's a fact. It means multiple threads can just use it at the same time, no drama, and you do not need to bring your own thread locks. None. Zero. You're free 💅✨

BUT. It is not interrupt safe, and the way that it's not interrupt safe is lowkey a whole thing 😭 Typically this happens because of memory allocation routines like malloc, or other non-MPICH runtime routines that are themselves not interrupt-safe. So the interrupt-safety vibe check does not pass. Do not come for this routine from a signal handler and expect it to slay. Fr fr 💀

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and that's the entire page, no cap 🌈

This cutie is from the MPI manual, dated 4/10/2026, and it's page MPI_Session_c2f(3) if you ever need to find it again bestie 🎀🦋💜