void GC_suspend_handler(int sig)
{
int dummy;
GC_thread me;
sigset_t all_sigs;
sigset_t old_sigs;
int i;
if (sig != SIG_SUSPEND) ABORT("Bad signal in suspend_handler");
me = GC_lookup_thread(pthread_self());
/* The lookup here is safe, since I'm doing this on behalf */
/* of a thread which holds the allocation lock in order */
/* to stop the world. Thus concurrent modification of the */
/* data structure is impossible. */
if (PLEASE_STOP != me -> stop) {
/* Misdirected signal. */
pthread_mutex_unlock(&GC_suspend_lock);
return;
}
pthread_mutex_lock(&GC_suspend_lock);
me -> stack_hot = (ptr_t)(&dummy);
me -> stop = STOPPED;
pthread_cond_signal(&GC_suspend_ack_cv);
pthread_cond_wait(&GC_continue_cv, &GC_suspend_lock);
pthread_mutex_unlock(&GC_suspend_lock);
/* GC_printf1("Continuing 0x%x\n", pthread_self()); */
}
GC_API int GC_register_my_thread(struct GC_stack_base *sb) {
DWORD t = GetCurrentThreadId();
if (0 == GC_lookup_thread(t)) {
/* We lock here, since we want to wait for an ongoing GC. */
LOCK();
GC_register_my_thread_inner(sb, t);
UNLOCK();
return GC_SUCCESS;
} else {
return GC_DUPLICATE;
}
}
int GC_pthread_detach(pthread_t thread)
{
GC_thread t;
LOCK();
t=GC_lookup_thread(thread);
UNLOCK();
if (t) {
LOCK();
t->flags |= DETACHED;
UNLOCK();
return 0;
}
else
return pthread_detach(thread);
}
GC_PTR GC_local_malloc(size_t bytes)
{
if (EXPECT(!SMALL_ENOUGH(bytes),0)) {
return(GC_malloc(bytes));
} else {
int index = INDEX_FROM_BYTES(bytes);
ptr_t * my_fl;
ptr_t my_entry;
# if defined(REDIRECT_MALLOC) && !defined(USE_PTHREAD_SPECIFIC)
GC_key_t k = GC_thread_key;
# endif
void * tsd;
# if defined(REDIRECT_MALLOC) && !defined(USE_PTHREAD_SPECIFIC)
if (EXPECT(0 == k, 0)) {
/* This can happen if we get called when the world is */
/* being initialized. Whether we can actually complete */
/* the initialization then is unclear. */
GC_init_parallel();
k = GC_thread_key;
}
# endif
tsd = GC_getspecific(GC_thread_key);
# ifdef GC_ASSERTIONS
LOCK();
GC_ASSERT(tsd == (void *)GC_lookup_thread(pthread_self()));
UNLOCK();
# endif
my_fl = ((GC_thread)tsd) -> normal_freelists + index;
my_entry = *my_fl;
if (EXPECT((word)my_entry >= HBLKSIZE, 1)) {
ptr_t next = obj_link(my_entry);
GC_PTR result = (GC_PTR)my_entry;
*my_fl = next;
obj_link(my_entry) = 0;
PREFETCH_FOR_WRITE(next);
return result;
} else if ((word)my_entry - 1 < DIRECT_GRANULES) {
*my_fl = my_entry + index + 1;
return GC_malloc(bytes);
} else {
GC_generic_malloc_many(BYTES_FROM_INDEX(index), NORMAL, my_fl);
if (*my_fl == 0) return GC_oom_fn(bytes);
return GC_local_malloc(bytes);
}
}
}
/* Must be called before a second thread is created. */
void GC_init_parallel(void)
{
if (parallel_initialized) return;
parallel_initialized = TRUE;
/* GC_init() calls us back, so set flag first. */
if (!GC_is_initialized) GC_init();
if (GC_win32_dll_threads) {
GC_need_to_lock = TRUE;
/* Cannot intercept thread creation. Hence we don't know if */
/* other threads exist. However, client is not allowed to */
/* create other threads before collector initialization. */
/* Thus it's OK not to lock before this. */
}
/* Initialize thread local free lists if used. */
# if defined(THREAD_LOCAL_ALLOC)
LOCK();
GC_init_thread_local(&(GC_lookup_thread(GetCurrentThreadId())->tlfs));
UNLOCK();
# endif
}
