renelindsay / forthreads

Parallel for loops in C++, using multi-threading.

ForThreads

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A tiny single-header-file library for running parallel for loops, using multi-threading.
At startup, ForThreads queries the current CPU for its optimal thread count.
Loop iterations are divided evenly between available threads.

• Double the cores, boosts speed by 1.6x.
• Hypertheading boosts speed by 1.3x.

WARNING: Iterations run concurrently, so avoid causing race conditions.

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USAGE:

#include "for_threads.h"

Single-threaded loop (for reference):

for(int i=0; i<100; ++i) {  // Loop from 0 to 99
    printf("i=%d\n", i);    // Print i value
}                           // No Semi-colon needed

Equivalent Multi-threaded loop :

for_threads(100) {          // Loop from 0 to 99, using i as loop counter.
    printf("i=%d\n", i);    // Warning: May run out of order: Don't write to shared vars!
};                          // Semi-colon is required :(