qt_connect(3)

💫 qt_connect(3) — the libqthread era 💫

okay bestie, welcome to libqthread's little corner of the manual, where qt_connect(3) lives and it is literally here to make your sockets not block your whole vibe. 🦋

✨ NAME ✨

qt_connect — initiate a connection on a socket 👑

🌸 SYNOPSIS 🌸

#include <qthread/qt_syscalls.h>

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

that's the whole thing. three args, one int back. clean, crisp, no notes. 🎀

💖 DESCRIPTION 💖

so, plot twist: this is a wrapper around the standard connect() system call function. it's giving "same energy, different delivery" 💅

instead of executing this blocking system call directly, the operation is enqueued in the internal system call queue to be handled. yes, queued. like when you send a text and it says delivered but you know it's sitting in the queue first. 🫶

the system call queue provides a way to perform blocking system calls without impeding parallel computation. iconic behavior, honestly.

operations are enqueued in an internal queue which is serviced by a dynamic number of dedicated system call threads. so the worker count isn't fixed — it flexes. 💪

this set of threads is capped at a user-configurable limit, specified with the QT_MAX_IO_WORKERS environment variable at initialization time. so if you want more workers, that's where you ask. no cap... well, actually, yes cap, that's the whole point 😭

when there are no more operations in the system call queue, these workers are persistent for a configurable amount of time, specified with the QT_IO_TIMEOUT environment variable at initialization time, before they exit.

and why do they linger like that? because it reduces the overhead involved in scaling up the number of worker threads to respond to newly enqueued system calls. they're not being clingy, they're being efficient ✨

also both of those env vars are read at initialization time, so setting them later is not it, bestie. 🙈

👀 SEE ALSO 👀

• connect(2)
• qt_accept(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)

go read those too, they're all part of the same friend group 💜

okay that's the page!! brought to you by libqthread, dated AUGUST 2012 — yeah, vintage, but she still ate. 🌈⭐ byeee, go connect some sockets responsibly 🧚🍓💖