SETSBUF(3PVM)

✨ SETSBUF(3PVM) ✨

okay bestie, welcome to the 3PVM corner of the manual — this is PVM Version 3.4, and today we're talking about pvm_setsbuf 💖

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🌸 NAME 🌸

pvm_setsbuf — switches the active send buffer. that's it, that's the whole job, and she does it flawlessly 💅

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🦋 SYNOPSIS 🦋

C:

int oldbuf = pvm_setsbuf( int bufid )

Fortran:

call pvmfsetsbuf( bufid, oldbuf )

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🎀 PARAMETERS 🎀

• bufid — Integer, and it's the message buffer identifier for the new active send buffer. plot twist: if you set it to 0, that means the default receive buffer. 🙈
• oldbuf — Integer that gets returned to you, holding the message buffer identifier for the previous active send buffer. she's the receipts, basically. 🧾

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💜 DESCRIPTION 💜

so here's the tea: pvm_setsbuf switches the active send buffer over to bufid, and it saves the previous active send buffer into oldbuf on the way out. no data lost, no drama. 🌈

and if bufid is set to 0? then the present active send buffer gets saved, and no active send buffer exists. literally zero. gone. iconic behaviour tbh. 💀

when do you actually need this? when you're managing multiple message buffers, bestie. like, switching back and forth between two buffers. for example: one buffer could be used to send information to a graphical interface, while a second buffer could be used to send data to other tasks in the application. two buffers, two vibes, one function keeping it all in check. 🫶

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🔥 EXAMPLES 🔥

C:

sbuf1 = pvm_setsbuf( sbuf2 );

Fortran:

CALL PVMFSETSBUF( NEWBUF, OLDBUF )

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💀 ERRORS 💀

these error conditions can be returned by pvm_setsbuf — and yes, she will absolutely let you know:

• PvmBadParam — you gave an invalid bufid. not the vibe. 😭
• PvmNoSuchBuf — you tried switching to a non-existent message buffer. girl. it's not there. 🕳️

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👑 SEE ALSO 👑

• pvm_setrbuf(3PVM)

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and that's the whole page, no cap 💖 this was SETSBUF(3PVM), PVM Version 3.4, dated 30 August, 1993 — yes, she's vintage, and she still slays. mwah, go switch some buffers bestie ✨🎀🦋