linuxrwlocks/linuxrwlocks.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 static void a(void *obj)
  12 {
  13         int i;
  14         for(i = 0; i < 2; i++) {
  15                 if ((i % 2) == 0) {
  16                         read_lock(&mylock);
  17                         load_32(&shareddata);
  18                         read_unlock(&mylock);
  19                 } else {
  20                         write_lock(&mylock);
  21                         store_32(&shareddata,(unsigned int)i);
  22                         write_unlock(&mylock);
  23                 }
  24         }
  25 }
  26
  27 int user_main(int argc, char **argv)
  28 {
  29         thrd_t t1, t2;
  30         atomic_init(&mylock.lock, RW_LOCK_BIAS);
  31
  32         thrd_create(&t1, (thrd_start_t)&a, NULL);
  33         thrd_create(&t2, (thrd_start_t)&a, NULL);
  34
  35         thrd_join(t1);
  36         thrd_join(t2);
  37
  38         return 0;
  39 }