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// testing that "__thread" specifier works
#undef NDEBUG
#include <assert.h>
#include <pthread.h>
#include <stdio.h>
static pthread_barrier_t b1, b2;
static pthread_t t;
static __thread int v;
static int *vaddr1;
static int *vaddr2;
static
void *
thread_func(void *param)
{
vaddr2 = &v;
v = 2; // setting this shouldn't change "v" value in main thread
pthread_barrier_wait(&b1);
pthread_barrier_wait(&b2);
return NULL;
}
int
main(void)
{
int ret;
ret = pthread_barrier_init(&b1, NULL, 2);
assert(ret == 0);
ret = pthread_barrier_init(&b2, NULL, 2);
assert(ret == 0);
vaddr1 = &v;
v = 1; // assign thread local variable a value
ret = pthread_create(&t, NULL, thread_func, NULL);
assert(ret == 0);
// wait for thread to set "v"
ret = pthread_barrier_wait(&b1);
assert(ret == 0);
// ensure this "v" is not affected by other thread
assert(v == 1);
// allow other thread to continue
pthread_barrier_wait(&b2);
pthread_join(t, NULL);
ret = pthread_barrier_destroy(&b1);
assert(ret == 0);
ret = pthread_barrier_destroy(&b2);
assert(ret == 0);
printf("vaddr1 = %p\n", vaddr1);
printf("vaddr2 = %p\n", vaddr2);
printf("pass\n");
return 0;
}
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