MPI_WIN_SET_NAME(3)

🌸 MPI_WIN_SET_NAME 🌸

okay bestie, so we're in the Open MPI manual today — this is the MPI_WIN_SET_NAME page, section 3, and it's all about giving your window a cute little name. yes, windows can have names. they're that girl. 💅

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🎀 NAME 🎀

MPI_Win_set_name — sets the name of a window ✨

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📜 SYNTAX 📜

💻 C Syntax 💻

#include <mpi.h>

int MPI_Win_set_name(MPI_Win win, const char *win_name)

🔮 Fortran Syntax 🔮

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_WIN_SET_NAME(WIN, WIN_NAME, IERROR)
     INTEGER WIN, IERROR
     CHARACTER*(*) WIN_NAME

🦋 Fortran 2008 Syntax 🦋

USE mpi_f08
MPI_Win_set_name(win, win_name, ierror)
     TYPE(MPI_Win), INTENT(IN) :: win
     CHARACTER(LEN=*), INTENT(IN) :: win_name
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

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🔁 INPUT/OUTPUT PARAMETER 🔁

• win — the window whose identifier is getting set, and it's a handle. it's giving both directions energy, hence the input/output thing, periodt ✨

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📥 INPUT PARAMETER 📥

• win_name — the character string that's gonna be used as the name, and yes it's a string</> 🎀

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📤 OUTPUT PARAMETER 📤

• ierror — Fortran only: the error status, an integer. C girlies get their error back as the return value instead, iykyk 😌

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📝 DESCRIPTION 📝

okay so real talk bestie, the source page has literally nothing written in this section. the heading is there and then it just… ends. no cap. i'm not gonna invent anything for you because that would be lying to your face and i love you too much for that 🙈 so: this section is empty in the original, and that's the whole tea 💀

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💀 ERRORS 💀

so basically almost every MPI routine hands you back an error value — C routines give it to you as the return result of the function, and Fortran routines put it in that last argument. okurrr.

and before that error value even gets returned, the current MPI error handler that's associated with the communication object (think communicator, window, file) gets called. if there's no communication object associated with the MPI call, then the call counts as attached to MPI_COMM_SELF and it'll call the associated MPI error handler. and when MPI_COMM_SELF is not initialized — like before MPI_Init/MPI_Init_thread, after MPI_Finalize, or when you're using the Sessions Model exclusively — the error raises the initial error handler. that initial error handler can be changed by calling MPI_Comm_set_errhandler on MPI_COMM_SELF when you're using the World model, or by the mpi_initial_errhandler CLI argument to mpiexec, or the info key to MPI_Comm_spawn/MPI_Comm_spawn_multiple. and if no other appropriate error handler has been set? then MPI_ERRORS_RETURN gets called for MPI I/O functions, and MPI_ERRORS_ABORT gets called for all other MPI functions. slay.

Open MPI ships three predefined error handlers you can use, and they are:

• MPI_ERRORS_ARE_FATAL — causes the program to abort all connected MPI processes. not a vibe check you want to fail fr fr 💀
• MPI_ERRORS_ABORT — an error handler that can be invoked on a communicator, window, file, or session. when it's called on a communicator, it acts as if MPI_Abort was called on that communicator. if it's called on a window or file, it acts as if MPI_Abort was called on a communicator containing the group of processes in the corresponding window or file. if it's called on a session, it aborts only the local process. main character energy, honestly 👑
• MPI_ERRORS_RETURN — returns an error code to the application. the chill one. the "we can talk about this" one 🫶

MPI applications can also implement their own error handlers by calling:

• MPI_Comm_create_errhandler then MPI_Comm_set_errhandler
• MPI_File_create_errhandler then MPI_File_set_errhandler
• MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init
• MPI_Win_create_errhandler then MPI_Win_set_errhandler

⚠️ note that MPI does not guarantee that an MPI program can continue past an error. like, at all. no promises, bestie 😭

see the MPI man page for a full list of MPI error codes. 📚

see the Error Handling section of the MPI-3.1 standard for more information. 🧚

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👑 COPYRIGHT 👑

2003-2026, The Open MPI Community

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and that's the whole page, bestie!! 🎀✨ source is the Open MPI manual, dated Sep 10, 2026, filed under MPI_WIN_SET_NAME(3) — go name a window, you absolute icon, mwah 💖🦋🌸