Libutask a User-Level Threads Library

Libutask is a simple user-level threads library that is designed to be extensible for experimenting with scheduling algorithms in user space.The library has a simple API and provides two schedulers, a cooperative and a preemptive one that schedules tasks in a round robin fashion. This is an example of how to use the cooperative scheduler of the library:

#include "utask.h"
/* task callback function */
void task_func(void *arg)
{
    volatile int i,c,b;
    for (i=0; i<1000; i++) {
        /* do some work */
        for (c=0; c<1000; c++);
        /* yield */
        utask_yield();
    }
    utask_destroy();
}

int main(int argc, char **argv)
{    
    /* initialize the library using the 
       default cooperative scheduler*/
    utask_init(NULL);

    /* create two tasks */
    utask_create (
        task_func, /* task callback */
        NULL,      /* task arguments */
        16384      /* stack size 16k */
    );

    utask_create (
        task_func,/* task callback */
        NULL,     /* task arguments */
        16384     /* stack size 16k */
    );

    /* start the scheduler */
    utask_run();
    return 0;
}

Source code:

hg clone https://code.google.com/p/libutask