linuxrwlocks/main.c

   1 #include <stdio.h>
   2 #include <threads.h>
   3 #include <stdatomic.h>
   4
   5 #include "librace.h"
   6 #include "linuxrwlocks.h"
   7
   8 rwlock_t mylock;
   9 int shareddata;
  10
  11 atomic_int x, y;
  12
  13 static void a(void *obj)
  14 {
  15         int i;
  16         for(i = 0; i < 2; i++) {
  17                 if ((i % 2) == 0) {
  18                         read_lock(&mylock);
  19                         load_32(&shareddata);
  20                         read_unlock(&mylock);
  21                 } else {
  22                         write_lock(&mylock);
  23                         store_32(&shareddata,(unsigned int)i);
  24                         write_unlock(&mylock);
  25                 }
  26         }
  27 }
  28
  29
  30 int user_main(int argc, char **argv)
  31 {
  32         thrd_t t1, t2;
  33         atomic_init(&mylock.lock, RW_LOCK_BIAS);
  34         atomic_init(&x, 0);
  35         atomic_init(&y, 0);
  36
  37         /** @Entry */
  38         thrd_create(&t1, (thrd_start_t)&a, NULL);
  39         thrd_create(&t2, (thrd_start_t)&a, NULL);
  40
  41         thrd_join(t1);
  42         thrd_join(t2);
  43
  44         return 0;
  45 }