static inline nc_thread_descriptor_t *nc_get_tdb(void) {
/*
* Fetch the thread-specific data pointer. This is usually just
* a wrapper around __libnacl_irt_tls.tls_get() but we don't use
* that here so that the IRT build can override the definition.
*/
return (void *) ((char *) __nacl_read_tp() + __nacl_tp_tdb_offset(TDB_SIZE));
}
static void nacl_irt_thread_exit(int32_t *stack_flag) {
struct nc_combined_tdb *tdb = get_irt_tdb(__nacl_read_tp());
__nc_tsd_exit();
/*
* Sanity check: Check that this function was not called on a thread
* created by the IRT's internal pthread_create(). For such
* threads, irt_thread_data == NULL.
*/
assert(tdb->tdb.irt_thread_data != NULL);
free(tdb->tdb.irt_thread_data);
NACL_SYSCALL(thread_exit)(stack_flag);
while (1) *(volatile int *) 0 = 0; /* Crash. */
}
/*
* This is the real first entry point for new threads.
*/
static void irt_start_thread(void) {
struct nc_combined_tdb *tdb = get_irt_tdb(__nacl_read_tp());
/*
* Fetch the user's start routine.
*/
void (*user_start)(void) = (void (*)(void)) tdb->tdb.start_func;
/*
* Now do per-thread initialization for the IRT-private C library state.
*/
__newlib_thread_init();
/*
* Finally, run the user code.
*/
(*user_start)();
/*
* That should never return. Crash hard if it does.
*/
while (1) *(volatile int *) 0 = 0; /* Crash. */
}
