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#include <stdio.h>
#include <pthread.h>
#include <assert.h>
_Thread_local unsigned int counter = 9999;
_Thread_local unsigned int uninitialized;
void *check_counter(void *arg)
{
(void)arg;
fprintf(stderr, "counter for worker thread: %d, at %p\n", counter, &counter);
fflush(stderr);
assert(counter == 9999);
fprintf(stderr, "uninitialized data for worker thread: %d, at %p\n", uninitialized, &uninitialized);
fflush(stderr);
assert(uninitialized == 0);
++counter;
++uninitialized;
fprintf(stderr, "counter for worker thread: %d\n", counter);
fflush(stderr);
assert(counter == 10000);
assert(uninitialized == 1);
return NULL;
}
int main()
{
fprintf(stderr, "counter for main thread: %d, at %p\n", counter, &counter);
fflush(stderr);
assert(counter == 9999);
fprintf(stderr, "uninitialized data for main thread: %d, at %p\n", uninitialized, &uninitialized);
fflush(stderr);
assert(uninitialized == 0);
++counter;
++uninitialized;
fprintf(stderr, "counter for main: %d\n", counter);
fflush(stderr);
assert(counter == 10000);
assert(uninitialized == 1);
pthread_t thd;
pthread_create(&thd, NULL, check_counter, NULL);
pthread_join(thd, NULL);
fprintf(stderr, "counter for main: %d\n", counter);
fflush(stderr);
assert(counter == 10000);
assert(uninitialized == 1);
}
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