unpv13e/threads/example01.lc

#include    "unpthread.h"##  1 ##src/threads/example01.c##

#define NLOOP 5000##  2 ##src/threads/example01.c##

int     counter;                /* this is incremented by the threads */##  3 ##src/threads/example01.c##

void   *doit(void *);##  4 ##src/threads/example01.c##

int##  5 ##src/threads/example01.c##
main(int argc, char **argv)##  6 ##src/threads/example01.c##
{##  7 ##src/threads/example01.c##
    pthread_t tidA, tidB;##  8 ##src/threads/example01.c##

    Pthread_create(&tidA, NULL, &doit, NULL);##  9 ##src/threads/example01.c##
    Pthread_create(&tidB, NULL, &doit, NULL);## 10 ##src/threads/example01.c##

    /* 4wait for both threads to terminate */## 11 ##src/threads/example01.c##
    Pthread_join(tidA, NULL);## 12 ##src/threads/example01.c##
    Pthread_join(tidB, NULL);## 13 ##src/threads/example01.c##

    exit(0);## 14 ##src/threads/example01.c##
}## 15 ##src/threads/example01.c##

void   *## 16 ##src/threads/example01.c##
doit(void *vptr)## 17 ##src/threads/example01.c##
{## 18 ##src/threads/example01.c##
    int     i, val;## 19 ##src/threads/example01.c##

    /* ## 20 ##src/threads/example01.c##
     * Each thread fetches, prints, and increments the counter NLOOP times.## 21 ##src/threads/example01.c##
     * The value of the counter should increase monotonically.## 22 ##src/threads/example01.c##
     */## 23 ##src/threads/example01.c##

    for (i = 0; i < NLOOP; i++) {## 24 ##src/threads/example01.c##
        val = counter;## 25 ##src/threads/example01.c##
        printf("%d: %d\n", pthread_self(), val + 1);## 26 ##src/threads/example01.c##
        counter = val + 1;## 27 ##src/threads/example01.c##
    }## 28 ##src/threads/example01.c##

    return (NULL);## 29 ##src/threads/example01.c##
}## 30 ##src/threads/example01.c##