qt_accept(3)

💖 qt_accept — the manual page, but make it cute 💖

okay bestie, welcome to qt_accept(3), a page from the libqthread manual. yes it's a syscall wrapper, no it's not boring, sit down, hydrate, let's go 🫶

✨ NAME ✨

qt_accept — accept a connection on a socket 🌸

✨ SYNOPSIS ✨

#include <qthread/qt_syscalls.h>

int
qt_accept (int socket,
           struct sockaddr *restrict address,
           socklen_t *restrict address_len);

like. look at that signature. the restrict qualifiers are doing their little main character thing, we love to see it 💅

✨ DESCRIPTION ✨

so here's the tea ☕ this function is a wrapper around the standard accept() system call function. but — and this is the whole point, iykyk — instead of just executing that blocking system call directly, the operation gets enqueued into the internal system call queue to be handled. not me, not you, the queue handles it. iconic behaviour honestly 👑

the system call queue is literally the whole vibe of this library: it's a way to perform blocking system calls without impeding parallel computation. the way that it works is that operations get enqueued in an internal queue, and that queue is serviced by a dynamic number of dedicated system call threads ✨ dynamic! it scales! it grows! it's giving elastic 🦋

but there's a cap, bestie, there's always a cap. that set of threads is capped at a user-configurable limit, and you specify it with the QT_MAX_IO_WORKERS environment variable at initialization time. so like, set it before things spin up, not after. timing matters, fr fr ⏰

and when there are no more operations left in the system call queue? the workers don't just dip instantly 😭 they stay persistent for a configurable amount of time — specified with the QT_IO_TIMEOUT environment variable, again at initialization time — before they exit. why? because spawning up a whole bunch of worker threads every time a new syscall shows up is so much overhead, and this is the anti-overhead situation. they hang around, waiting, ready, in case you need them again. main character energy tbh 💖

🌈 SEE ALSO 🌈

go read these next, they're all part of the same friend group:

• accept(2)
• qt_connect(3)
• qt_poll(3)
• qt_pread(3)
• qt_pwrite(3)
• qt_read(3)
• qt_select(3)
• qt_system(3)
• qt_wait4(3)
• qt_write(3)

okay that's the whole page, you ate it, no crumbs 🎀 this has been qt_accept(3) from libqthread, dated AUGUST 2012 — yes she's an elder, yes she still serves 💜 bye bestie, go enqueue something 💅✨