void
_dispatch_introspection_thread_add(void)
{
if (_dispatch_thread_getspecific(dispatch_introspection_key)) {
return;
}
uintptr_t thread = _dispatch_thread_self();
dispatch_introspection_thread_t dit = (void*)_dispatch_continuation_alloc();
dit->dit_isa = (void*)0x41;
dit->thread = (void*)thread;
dit->queue = !_dispatch_introspection_thread_queue_offset ? NULL :
(void*)thread + _dispatch_introspection_thread_queue_offset;
_dispatch_thread_setspecific(dispatch_introspection_key, dit);
OSSpinLockLock(&_dispatch_introspection_threads_lock);
TAILQ_INSERT_TAIL(&_dispatch_introspection_threads, dit, dit_list);
OSSpinLockUnlock(&_dispatch_introspection_threads_lock);
}
DISPATCH_NOINLINE
void
dispatch_apply_f(size_t iterations, dispatch_queue_t dq, void *ctxt,
void (*func)(void *, size_t))
{
if (slowpath(iterations == 0)) {
return;
}
dispatch_apply_t da = (typeof(da))_dispatch_continuation_alloc();
da->da_func = func;
da->da_ctxt = ctxt;
da->da_iterations = iterations;
da->da_index = 0;
da->da_thr_cnt = _dispatch_hw_config.cc_max_active;
da->da_done = 0;
da->da_queue = NULL;
if (da->da_thr_cnt > DISPATCH_APPLY_MAX_CPUS) {
da->da_thr_cnt = DISPATCH_APPLY_MAX_CPUS;
}
if (iterations < da->da_thr_cnt) {
da->da_thr_cnt = (uint32_t)iterations;
}
if (slowpath(dq->dq_width <= 2) || slowpath(da->da_thr_cnt <= 1) ||
slowpath(_dispatch_thread_getspecific(dispatch_apply_key))) {
return dispatch_sync_f(dq, da, _dispatch_apply_serial);
}
dispatch_queue_t old_dq = (dispatch_queue_t)
_dispatch_thread_getspecific(dispatch_queue_key);
if (slowpath(dq->do_targetq)) {
if (slowpath(dq == old_dq)) {
return dispatch_sync_f(dq, da, _dispatch_apply_serial);
} else {
da->da_queue = dq;
return dispatch_sync_f(dq, da, _dispatch_apply_redirect);
}
}
dispatch_atomic_acquire_barrier();
_dispatch_thread_setspecific(dispatch_queue_key, dq);
_dispatch_apply_f2(dq, da, _dispatch_apply2);
_dispatch_thread_setspecific(dispatch_queue_key, old_dq);
}
DISPATCH_ALWAYS_INLINE
static inline void
_dispatch_apply_f2(dispatch_queue_t dq, dispatch_apply_t da,
dispatch_function_t func)
{
uint32_t i = 0;
dispatch_continuation_t head = NULL, tail = NULL;
// The current thread does not need a continuation
uint32_t continuation_cnt = da->da_thr_cnt - 1;
dispatch_assert(continuation_cnt);
for (i = 0; i < continuation_cnt; i++) {
dispatch_continuation_t next = _dispatch_continuation_alloc();
next->do_vtable = (void *)DISPATCH_OBJ_ASYNC_BIT;
next->dc_func = func;
next->dc_ctxt = da;
next->do_next = head;
head = next;
if (!tail) {
tail = next;
}
}
_dispatch_thread_semaphore_t sema = _dispatch_get_thread_semaphore();
da->da_sema = sema;
_dispatch_queue_push_list(dq, head, tail, continuation_cnt);
// Call the first element directly
_dispatch_apply2(da);
_dispatch_workitem_inc();
_dispatch_thread_semaphore_wait(sema);
_dispatch_put_thread_semaphore(sema);
}
