qt_double_prod(3)

💖 qt_double_prod — libqthread's parallel product page 💖

okay bestie, welcome to the libqthread manual, section 3. today's main character is qt_double_prod(3), and she brought her two besties qt_uint_prod and qt_int_prod along for the ride. they multiply arrays. in parallel. no cap. 🧮✨

✨ NAME ✨

qt_double_prod, qt_uint_prod, qt_int_prod — multiplies an array in parallel 🫶

🌸 SYNOPSIS 🌸

#include <qthread/qloop.h>

double
qt_double_prod (double *array, size_t length, int checkfeb);

unsigned int
qt_uint_prod (unsigned int *array, size_t length, int checkfeb);

int
qt_int_prod (int *array, size_t length, int checkfeb);

like, literally just include qthread/qloop.h and you're in. 💅

🦋 DESCRIPTION 🦋

so here's the vibe: these functions take an array of length numbers and hand you back the product of those numbers. that's it, that's the whole personality. but the way she does it? iconic. the product gets computed in parallel by splitting the iterations evenly among the shepherds. teamwork makes the dream work, fr fr. 🌈

now, about checkfeb — this is the part where you actually have to pay attention, bestie. if checkfeb is non-zero, these functions will wait for the entries in the array to be full before multiplying them. they're patient like that. 💅

⚠️ BUT — and this is the big one — they DO NOT check whether the array entries are properly aligned. not a vibe check, not an alignment check, nothing. she is simply not doing that for you. you have been warned, and that warning is in ALL CAPS in the original for a reason. 😭

⭐ RETURN VALUE ⭐

the product of the first length entries of array. that's the tea. 🍓

🎀 SEE ALSO 🎀

• qt_double_sum(3)
• qt_double_max(3)
• qt_double_min(3)
• qt_uint_sum(3)
• qt_uint_max(3)
• qt_uint_min(3)
• qt_int_sum(3)
• qt_int_max(3)
• qt_int_min(3)
• qt_loop(3)
• qt_loop_balance(3)
• qt_loopaccum_balance(3)

the whole friend group, together at last. squad goals honestly. 👑

and that's the page!! this one's from libqthread, dated APRIL 2011, and it's the qt_double_prod(3) entry — go forth and multiply (arrays, in parallel, with proper alignment because she will NOT be checking for you) 💖✨🎀🦋