MPI_T_CVAR_HANDLE_FREE(3)

💅 MPI_T_CVAR_HANDLE_FREE(3) 💅

okay so this is an Open MPI manpage, bestie — MPI_T_cvar_handle_alloc, MPI_T_cvar_handle_free, the whole handle situation. sit down, we're doing this 🫶

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✨ NAME ✨

MPI_T_cvar_handle_alloc, MPI_T_cvar_handle_free — allocate/free control variable handles, literally that's the whole gig 💅

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🌸 SYNTAX 🌸

🎀 C Syntax 🎀

#include <mpi.h>

int MPI_T_cvar_handle_alloc(int cvar_index, void *obj_handle,
                            MPI_T_cvar_handle *handle, int *count)

int MPI_T_cvar_handle_free(MPI_T_cvar_handle *handle)

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🦋 DESCRIPTION 🦋

so MPI_T_cvar_handle_alloc does the cute little matchmaking thing: it binds the control variable you named in cvar_index to the MPI object you passed in obj_handle ✨

and like — plot twist — if MPI_T_cvar_get_info hands back MPI_T_BIND_NO_OBJECT as the binding of the variable, then the obj_handle argument is just ignored. not ghosted, ignored. different thing 💀

the number of values this control variable represents comes back to you in the count parameter. and if the control variable is a string? then count is the maximum length of the string. no cap, that's the rule 🎀

then MPI_T_cvar_handle_free — as the name so kindly suggests — frees a handle that MPI_T_cvar_handle_alloc gave you, and sets the handle argument to MPI_T_CVAR_HANDLE_NULL. clean up after yourself, main character energy 👑

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💜 NOTES 💜

lowkey important: Open MPI does not currently support binding MPI objects to control variables, so the obj_handle argument is always ignored. every time. periodt 🙈

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🔥 ERRORS 🔥

MPI_T_cvar_handle_alloc will fail if:

• MPI_T_ERR_NOT_INITIALIZED — The MPI Tools interface not initialized 😭
• MPI_T_ERR_INVALID_INDEX — The control variable index is invalid 💀
• MPI_T_ERR_OUT_OF_HANDLES — No more handles available 🌸

MPI_T_cvar_handle_free will fail if:

• MPI_T_ERR_NOT_INITIALIZED — The MPI Tools interface not initialized 😭
• MPI_T_ERR_INVALID_HANDLE — The handle is invalid 💀

👀 SEE ALSO: 👀

• MPI_T_cvar_get_info — go read that one next, bestie, iykyk 🦋

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👑 COPYRIGHT 👑

2003-2026, The Open MPI Community

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and that's the page!! mwah 💖 shoutout to Open MPI and the whole Open MPI Community for this iconic Sep 11, 2026 edition of MPI_T_CVAR_HANDLE_FREE(3) — go forth and free your handles responsibly, bestie 🎀✨🫶