SHMEM_ADDR_ACCESSIBLE(3)

💅 SHMEM_ADDR_ACCESSIBLE(3) — an Open MPI moment

okay bestie, so this one is from Open MPI and it's called shmem_addr_accessible — and no, it's not asking if you're accessible, it's asking if an address is 💀

🌸 NAME

shmem_addr_accessible — tells you whether an address is reachable through OpenSHMEM operations from whichever remote PE you point at. literally a vibe check for pointers ✨

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🎀 SYNOPSIS

C or C++:

#include <mpp/shmem.h>

int shmem_addr_accessible(const void *addr, int pe)

Fortran:

INCLUDE "mpp/shmem.fh"

LOGICAL LOG, SHMEM_ADDR_ACCESSIBLE
INTEGER pe

LOG = SHMEM_ADDR_ACCESSIBLE(addr, pe)

like, yes, Fortran is still here and she's thriving 🫶

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🦋 DESCRIPTION

So shmem_addr_accessible is a query function — a little gossip session, basically. You hand it a local address, and it tells you whether that address can be accessed via SHMEM operations from the remote PE you specified. 👑

What it's actually confirming, fr fr:

• that the remote PE is accessible from the local PE using SHMEM data transfer functions, and
• that the address you gave lives in a symmetric data segment with respect to that remote PE.

both boxes checked? iconic. one missing? she'll let you know. 💅

ngl this is the "are we actually besties or not" function and I respect it for that.

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⭐ RETURN VALUES

C: you get 1 back if addr is a symmetric data object and it's accessible via SHMEM operations from the specified remote PE — otherwise it's 0. no in-between, no "it's complicated". 💀

Fortran: same energy, different spelling — the return is .TRUE. if addr is a symmetric data object and accessible via SHMEM operations from the specified remote PE; otherwise it's .FALSE.. (yes there are two periods there at the end of the sentence, that's just how she types 😭)

👀 SEE ALSO

• intro_shmem(3)
• shmem_pe_accessible(3)

go read those too, iykyk 🌈

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🧚 COPYRIGHT

2003-2026, The Open MPI Community — the whole squad, holding it down since '03. 💜

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and that's the page, bestie!! 🍓 source & version: Open MPI, dated May 14, 2026 — catch you in the next man page, mwah 💖🎀✨