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/* BeginSourceFile tls.c
This file creates and deletes threads. It uses thread local storage
variables too. */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <pthread.h>
#include <semaphore.h>
#include <errno.h>
#define N_THREADS 3
/* Uncomment to turn on debugging output */
/*#define START_DEBUG*/
/* Thread-local storage. */
__thread int a_thread_local;
class K {
public:
static __thread int another_thread_local;
};
__thread int K::another_thread_local;
/* psymtabs->symtabs resolving check. */
extern __thread int file2_thread_local;
/* Global variable just for info addr in gdb. */
int a_global;
/* Print the results of thread-local storage. */
int thread_local_val[ N_THREADS ];
int another_thread_local_val[ N_THREADS ];
/* Semaphores to make sure the threads are alive when we print the TLS
variables from gdb. */
sem_t tell_main, tell_thread;
void print_error ()
{
switch (errno)
{
case EAGAIN:
fprintf (stderr, "EAGAIN\n");
break;
case EINTR:
fprintf (stderr, "EINTR\n");
break;
case EINVAL:
fprintf (stderr, "EINVAL\n");
break;
case ENOSYS:
fprintf (stderr, "ENOSYS\n");
break;
case ENOENT:
fprintf (stderr, "ENOENT\n");
break;
case EDEADLK:
fprintf (stderr, "EDEADLK\n");
break;
default:
fprintf (stderr, "Unknown error\n");
break;
}
}
/* Routine for each thread to run, does nothing. */
void *spin( void *vp )
{
int me = (long) vp;
int i;
/* Use a_global. */
a_global++;
a_thread_local = 0;
K::another_thread_local = me;
for( i = 0; i <= me; i++ ) {
a_thread_local += i;
}
another_thread_local_val[me] = K::another_thread_local;
thread_local_val[ me ] = a_thread_local; /* here we know tls value */
if (sem_post (&tell_main) == -1)
{
fprintf (stderr, "th %d post on sem tell_main failed\n", me);
print_error ();
return NULL;
}
#ifdef START_DEBUG
fprintf (stderr, "th %d post on tell main\n", me);
#endif
while (1)
{
#ifdef START_DEBUG
fprintf (stderr, "th %d start wait on tell_thread\n", me);
#endif
if (sem_wait (&tell_thread) == 0)
break;
if (errno == EINTR)
{
#ifdef START_DEBUG
fprintf (stderr, "th %d wait tell_thread got EINTR, rewaiting\n", me);
#endif
continue;
}
else
{
fprintf (stderr, "th %d wait on sem tell_thread failed\n", me);
print_error ();
return NULL;
}
}
#ifdef START_DEBUG
fprintf (stderr, "th %d Wait on tell_thread\n", me);
#endif
return NULL;
}
void
function_referencing_file2_thread_local (void)
{
file2_thread_local = file2_thread_local;
}
void
do_pass()
{
int i;
pthread_t t[ N_THREADS ];
int err;
for( i = 0; i < N_THREADS; i++)
{
thread_local_val[i] = 0;
another_thread_local_val[i] = 0;
}
if (sem_init (&tell_main, 0, 0) == -1)
{
fprintf (stderr, "tell_main semaphore init failed\n");
return;
}
if (sem_init (&tell_thread, 0, 0) == -1)
{
fprintf (stderr, "tell_thread semaphore init failed\n");
return;
}
/* Start N_THREADS threads, then join them so that they are terminated. */
for( i = 0; i < N_THREADS; i++ )
{
err = pthread_create( &t[i], NULL, spin, (void *) (long) i );
if( err != 0 ) {
fprintf(stderr, "Error in thread %d create\n", i );
}
}
for( i = 0; i < N_THREADS; i++ )
{
while (1)
{
#ifdef START_DEBUG
fprintf (stderr, "main %d start wait on tell_main\n", i);
#endif
if (sem_wait (&tell_main) == 0)
break;
if (errno == EINTR)
{
#ifdef START_DEBUG
fprintf (stderr, "main %d wait tell_main got EINTR, rewaiting\n", i);
#endif
continue;
}
else
{
fprintf (stderr, "main %d wait on sem tell_main failed\n", i);
print_error ();
return;
}
}
}
#ifdef START_DEBUG
fprintf (stderr, "main done waiting on tell_main\n");
#endif
i = 10; /* Here all threads should be still alive. */
for( i = 0; i < N_THREADS; i++ )
{
if (sem_post (&tell_thread) == -1)
{
fprintf (stderr, "main %d post on sem tell_thread failed\n", i);
print_error ();
return;
}
#ifdef START_DEBUG
fprintf (stderr, "main %d post on tell_thread\n", i);
#endif
}
for( i = 0; i < N_THREADS; i++ )
{
err = pthread_join(t[i], NULL );
if( err != 0 )
{
fprintf (stderr, "error in thread %d join\n", i );
}
}
i = 10; /* Null line for setting bpts on. */
}
int
main()
{
do_pass ();
return 0; /* Set breakpoint here before exit. */
}
/* EndSourceFile */
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