------- Comment #70 from dominiq at lps dot ens dot fr 2010-06-03 18:23 -------
(In reply to comment #68)
> That makes sense, so all we need to do in config/tls.m4 is probably:
> 1) move a_in_main_thread variable to file scope, and neither a_in_main_thread
> nor a_in_other_thread should be static
> 2) move a_in_main_thread = &a; before pthread_create
> That should be IMHO all that is needed, the compiler can't then move
> a_in_main_thread assignment after pthread_create. Or to be really sure make
> a_in_main_thread and a_in_other_thread volatile too.
Does this code follow these instructions?
#include <pthread.h>
__thread int a;
int *a_in_main_thread;
int *a_in_other_thread;
static void *
thread_func (void *arg)
{
a_in_other_thread = &a;
return (void *)0;
}
int
main ()
{
pthread_t thread;
void *thread_retval;
a_in_main_thread = &a;
if (pthread_create (&thread, (pthread_attr_t *)0,
thread_func, (void *)0))
return 0;
if (pthread_join (thread, &thread_retval))
return 0;
return (a_in_other_thread == a_in_main_thread);
;
return 0;
}
I have compiled it with -O2 -g -pthread and ran it 10000 times on a loaded
system without failure.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43170
