/*
* Routine: lck_rw_sleep
*/
wait_result_t
lck_rw_sleep(
lck_rw_t *lck,
lck_sleep_action_t lck_sleep_action,
event_t event,
wait_interrupt_t interruptible)
{
wait_result_t res;
lck_rw_type_t lck_rw_type;
if ((lck_sleep_action & ~LCK_SLEEP_MASK) != 0)
panic("Invalid lock sleep action %x\n", lck_sleep_action);
res = assert_wait(event, interruptible);
if (res == THREAD_WAITING) {
lck_rw_type = lck_rw_done(lck);
res = thread_block(THREAD_CONTINUE_NULL);
if (!(lck_sleep_action & LCK_SLEEP_UNLOCK)) {
if (!(lck_sleep_action & (LCK_SLEEP_SHARED|LCK_SLEEP_EXCLUSIVE)))
lck_rw_lock(lck, lck_rw_type);
else if (lck_sleep_action & LCK_SLEEP_EXCLUSIVE)
lck_rw_lock_exclusive(lck);
else
lck_rw_lock_shared(lck);
}
}
else
if (lck_sleep_action & LCK_SLEEP_UNLOCK)
(void)lck_rw_done(lck);
return res;
}
/*
* Routine: lck_spin_sleep
*/
wait_result_t
lck_spin_sleep(
lck_spin_t *lck,
lck_sleep_action_t lck_sleep_action,
event_t event,
wait_interrupt_t interruptible)
{
wait_result_t res;
if ((lck_sleep_action & ~LCK_SLEEP_MASK) != 0)
panic("Invalid lock sleep action %x\n", lck_sleep_action);
res = assert_wait(event, interruptible);
if (res == THREAD_WAITING) {
lck_spin_unlock(lck);
res = thread_block(THREAD_CONTINUE_NULL);
if (!(lck_sleep_action & LCK_SLEEP_UNLOCK))
lck_spin_lock(lck);
}
else
if (lck_sleep_action & LCK_SLEEP_UNLOCK)
lck_spin_unlock(lck);
return res;
}
/*
* swapin_thread: [exported]
*
* This procedure executes as a kernel thread. Threads that need to
* be swapped in are swapped in by this thread.
*/
void __attribute__((noreturn)) swapin_thread_continue(void)
{
for (;;) {
thread_t thread;
spl_t s;
s = splsched();
swapper_lock();
while ((thread = (thread_t) dequeue_head(&swapin_queue))
!= THREAD_NULL) {
kern_return_t kr;
swapper_unlock();
(void) splx(s);
kr = thread_doswapin(thread); /* may block */
s = splsched();
swapper_lock();
if (kr != KERN_SUCCESS) {
enqueue_head(&swapin_queue,
(queue_entry_t) thread);
break;
}
}
assert_wait((event_t) &swapin_queue, FALSE);
swapper_unlock();
(void) splx(s);
counter(c_swapin_thread_block++);
thread_block(swapin_thread_continue);
}
}
/*
* Routine: lck_mtx_sleep
*/
wait_result_t
lck_mtx_sleep(
lck_mtx_t *lck,
lck_sleep_action_t lck_sleep_action,
event_t event,
wait_interrupt_t interruptible)
{
wait_result_t res;
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_MTX_SLEEP_CODE) | DBG_FUNC_START,
(int)lck, (int)lck_sleep_action, (int)event, (int)interruptible, 0);
if ((lck_sleep_action & ~LCK_SLEEP_MASK) != 0)
panic("Invalid lock sleep action %x\n", lck_sleep_action);
res = assert_wait(event, interruptible);
if (res == THREAD_WAITING) {
lck_mtx_unlock(lck);
res = thread_block(THREAD_CONTINUE_NULL);
if (!(lck_sleep_action & LCK_SLEEP_UNLOCK))
lck_mtx_lock(lck);
}
else
if (lck_sleep_action & LCK_SLEEP_UNLOCK)
lck_mtx_unlock(lck);
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_MTX_SLEEP_CODE) | DBG_FUNC_END, (int)res, 0, 0, 0, 0);
return res;
}
void
cyclic_remove(cyclic_id_t cyclic)
{
wrap_thread_call_t *wrapTC = (wrap_thread_call_t *)cyclic;
ASSERT(cyclic != CYCLIC_NONE);
while (!thread_call_cancel(wrapTC->TChdl)) {
int ret = assert_wait(wrapTC, THREAD_UNINT);
ASSERT(ret == THREAD_WAITING);
wrapTC->when.cyt_interval = WAKEUP_REAPER;
ret = thread_block(THREAD_CONTINUE_NULL);
ASSERT(ret == THREAD_AWAKENED);
}
if (thread_call_free(wrapTC->TChdl))
_FREE(wrapTC, M_TEMP);
else {
/* Gut this cyclic and move on ... */
wrapTC->hdlr.cyh_func = noop_cyh_func;
wrapTC->when.cyt_interval = NEARLY_FOREVER;
}
}
/*
* special_handler - handles suspension, termination. Called
* with nothing locked. Returns (if it returns) the same way.
*/
void
special_handler(
thread_t thread)
{
spl_t s;
thread_mtx_lock(thread);
s = splsched();
thread_lock(thread);
thread->sched_flags &= ~TH_SFLAG_ABORTED_MASK;
thread_unlock(thread);
splx(s);
/*
* If we're suspended, go to sleep and wait for someone to wake us up.
*/
if (thread->active) {
if (thread->suspend_count > 0) {
assert_wait(&thread->suspend_count, THREAD_ABORTSAFE);
thread_mtx_unlock(thread);
thread_block((thread_continue_t)special_handler_continue);
/*NOTREACHED*/
}
}
else {
thread_mtx_unlock(thread);
thread_terminate_self();
/*NOTREACHED*/
}
thread_mtx_unlock(thread);
}
nw_result mk_multicast_drop(nw_ep local_ep, nw_address_1 rem_addr_1,
nw_address_2 rem_addr_2, nw_ep remote_ep) {
nw_result rc;
nw_pv_t pv;
nw_lock();
if (local_ep >= MAX_EP || (pv = hect[local_ep].pv) == NULL) {
rc = NW_BAD_EP;
} else {
while (pv != NULL && pv->owner != current_task())
pv = pv->next;
if (pv == NULL) {
rc = NW_PROT_VIOLATION;
} else {
rc = (*(devct[NW_DEVICE(rem_addr_1)].entry->drop))
(local_ep, rem_addr_1, rem_addr_2, remote_ep);
if (rc == NW_SYNCH) {
hect[local_ep].sig_waiter = current_thread();
assert_wait(0, TRUE);
current_thread()->nw_ep_waited = NULL;
simple_unlock(&nw_simple_lock);
thread_block(mk_return);
}
}
}
nw_unlock();
return rc;
}
/*
* Wait for all requested invocations of a thread call prior to now
* to finish. Can only be invoked on thread calls whose storage we manage.
* Just waits for the finish count to catch up to the submit count we find
* at the beginning of our wait.
*/
static void
thread_call_wait_locked(thread_call_t call)
{
uint64_t submit_count;
wait_result_t res;
assert(call->tc_flags & THREAD_CALL_ALLOC);
submit_count = call->tc_submit_count;
while (call->tc_finish_count < submit_count) {
call->tc_flags |= THREAD_CALL_WAIT;
res = assert_wait(call, THREAD_UNINT);
if (res != THREAD_WAITING) {
panic("Unable to assert wait?");
}
thread_call_unlock();
(void) spllo();
res = thread_block(NULL);
if (res != THREAD_AWAKENED) {
panic("Awoken with %d?", res);
}
(void) splsched();
thread_call_lock_spin();
}
}
nw_result mk_connection_close(nw_ep ep) {
nw_result rc;
nw_pv_t pv;
nw_lock();
if (ep >= MAX_EP || (pv = hect[ep].pv) == NULL) {
rc = NW_BAD_EP;
} else {
while (pv != NULL && pv->owner != current_task())
pv = pv->next;
if (pv == NULL) {
rc = NW_PROT_VIOLATION;
} else {
rc = (*devct[NW_DEVICE(ect[ep].conn->peer.rem_addr_1)].entry->close)
(ep);
if (rc == NW_SYNCH) {
hect[ep].sig_waiter = current_thread();
assert_wait(0, TRUE);
current_thread()->nw_ep_waited = NULL;
simple_unlock(&nw_simple_lock);
thread_block(mk_return);
}
}
}
nw_unlock();
return rc;
}
/*
* thread_stack_daemon:
*
* Perform stack allocation as required due to
* invoke failures.
*/
static void
thread_stack_daemon(void)
{
thread_t thread;
simple_lock(&thread_stack_lock);
while ((thread = (thread_t)dequeue_head(&thread_stack_queue)) != THREAD_NULL) {
simple_unlock(&thread_stack_lock);
stack_alloc(thread);
(void)splsched();
thread_lock(thread);
thread_setrun(thread, SCHED_PREEMPT | SCHED_TAILQ);
thread_unlock(thread);
(void)spllo();
simple_lock(&thread_stack_lock);
}
assert_wait((event_t)&thread_stack_queue, THREAD_UNINT);
simple_unlock(&thread_stack_lock);
thread_block((thread_continue_t)thread_stack_daemon);
/*NOTREACHED*/
}
bool DldIODataQueue::waitForData()
{
assert( preemption_enabled() );
bool wait;
IOLockLock( this->lock );
{// start of the lock
//
// wait if the queue is empty
//
wait = ( this->dataQueue->head == this->dataQueue->tail );
if( wait && THREAD_WAITING != assert_wait( this->dataQueue, THREAD_UNINT ) )
wait = false;
}// end of the lock
IOLockUnlock( this->lock );
if( wait )
thread_block( THREAD_CONTINUE_NULL );
return true;
}
/* virtual */ void IOWorkLoop::threadMain()
{
restartThread:
do {
if ( !runEventSources() )
goto exitThread;
IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
if ( !ISSETP(&fFlags, kLoopTerminate) && !workToDo) {
assert_wait((void *) &workToDo, false);
IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
thread_continue_t cptr = NULL;
if (!reserved || !(kPreciousStack & reserved->options))
cptr = OSMemberFunctionCast(
thread_continue_t, this, &IOWorkLoop::threadMain);
thread_block_parameter(cptr, this);
goto restartThread;
/* NOTREACHED */
}
// At this point we either have work to do or we need
// to commit suicide. But no matter
// Clear the simple lock and retore the interrupt state
IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
} while(workToDo);
exitThread:
thread_t thread = workThread;
workThread = 0; // Say we don't have a loop and free ourselves
free();
thread_deallocate(thread);
(void) thread_terminate(thread);
}
void
action_thread(void)
{
register processor_t processor;
spl_t s;
thread_swappable(current_act(), FALSE);
while (TRUE) {
s = splsched();
simple_lock(&action_lock);
while ( !queue_empty(&action_queue)) {
processor = (processor_t) queue_first(&action_queue);
queue_remove(&action_queue, processor, processor_t,
processor_queue);
simple_unlock(&action_lock);
splx(s);
processor_doaction(processor);
s = splsched();
simple_lock(&action_lock);
}
assert_wait((event_t) &action_queue, FALSE);
simple_unlock(&action_lock);
splx(s);
counter(c_action_thread_block++);
thread_block((void (*)(void)) 0);
}
}
/*
* Routine: lck_rw_sleep
*/
wait_result_t
lck_rw_sleep(
lck_rw_t *lck,
lck_sleep_action_t lck_sleep_action,
event_t event,
wait_interrupt_t interruptible)
{
wait_result_t res;
lck_rw_type_t lck_rw_type;
thread_t thread = current_thread();
if ((lck_sleep_action & ~LCK_SLEEP_MASK) != 0)
panic("Invalid lock sleep action %x\n", lck_sleep_action);
if (lck_sleep_action & LCK_SLEEP_PROMOTED_PRI) {
/*
* Although we are dropping the RW lock, the intent in most cases
* is that this thread remains as an observer, since it may hold
* some secondary resource, but must yield to avoid deadlock. In
* this situation, make sure that the thread is boosted to the
* RW lock ceiling while blocked, so that it can re-acquire the
* RW lock at that priority.
*/
thread->rwlock_count++;
}
res = assert_wait(event, interruptible);
if (res == THREAD_WAITING) {
lck_rw_type = lck_rw_done(lck);
res = thread_block(THREAD_CONTINUE_NULL);
if (!(lck_sleep_action & LCK_SLEEP_UNLOCK)) {
if (!(lck_sleep_action & (LCK_SLEEP_SHARED|LCK_SLEEP_EXCLUSIVE)))
lck_rw_lock(lck, lck_rw_type);
else if (lck_sleep_action & LCK_SLEEP_EXCLUSIVE)
lck_rw_lock_exclusive(lck);
else
lck_rw_lock_shared(lck);
}
}
else
if (lck_sleep_action & LCK_SLEEP_UNLOCK)
(void)lck_rw_done(lck);
if (lck_sleep_action & LCK_SLEEP_PROMOTED_PRI) {
if ((thread->rwlock_count-- == 1 /* field now 0 */) && (thread->sched_flags & TH_SFLAG_RW_PROMOTED)) {
/* sched_flags checked without lock, but will be rechecked while clearing */
/* Only if the caller wanted the lck_rw_t returned unlocked should we drop to 0 */
assert(lck_sleep_action & LCK_SLEEP_UNLOCK);
lck_rw_clear_promotion(thread);
}
}
return res;
}
/*
* Routine: lck_mtx_sleep
*/
wait_result_t
lck_mtx_sleep(
lck_mtx_t *lck,
lck_sleep_action_t lck_sleep_action,
event_t event,
wait_interrupt_t interruptible)
{
wait_result_t res;
thread_t thread = current_thread();
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_MTX_SLEEP_CODE) | DBG_FUNC_START,
VM_KERNEL_UNSLIDE_OR_PERM(lck), (int)lck_sleep_action, VM_KERNEL_UNSLIDE_OR_PERM(event), (int)interruptible, 0);
if ((lck_sleep_action & ~LCK_SLEEP_MASK) != 0)
panic("Invalid lock sleep action %x\n", lck_sleep_action);
if (lck_sleep_action & LCK_SLEEP_PROMOTED_PRI) {
/*
* We overload the RW lock promotion to give us a priority ceiling
* during the time that this thread is asleep, so that when it
* is re-awakened (and not yet contending on the mutex), it is
* runnable at a reasonably high priority.
*/
thread->rwlock_count++;
}
res = assert_wait(event, interruptible);
if (res == THREAD_WAITING) {
lck_mtx_unlock(lck);
res = thread_block(THREAD_CONTINUE_NULL);
if (!(lck_sleep_action & LCK_SLEEP_UNLOCK)) {
if ((lck_sleep_action & LCK_SLEEP_SPIN))
lck_mtx_lock_spin(lck);
else if ((lck_sleep_action & LCK_SLEEP_SPIN_ALWAYS))
lck_mtx_lock_spin_always(lck);
else
lck_mtx_lock(lck);
}
}
else
if (lck_sleep_action & LCK_SLEEP_UNLOCK)
lck_mtx_unlock(lck);
if (lck_sleep_action & LCK_SLEEP_PROMOTED_PRI) {
if ((thread->rwlock_count-- == 1 /* field now 0 */) && (thread->sched_flags & TH_SFLAG_RW_PROMOTED)) {
/* sched_flags checked without lock, but will be rechecked while clearing */
lck_rw_clear_promotion(thread);
}
}
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_MTX_SLEEP_CODE) | DBG_FUNC_END, (int)res, 0, 0, 0, 0);
return res;
}
/*
* thread_terminate_daemon:
*
* Perform final clean up for terminating threads.
*/
static void
thread_terminate_daemon(void)
{
thread_t thread;
task_t task;
(void)splsched();
simple_lock(&thread_terminate_lock);
while ((thread = (thread_t)dequeue_head(&thread_terminate_queue)) != THREAD_NULL) {
simple_unlock(&thread_terminate_lock);
(void)spllo();
task = thread->task;
task_lock(task);
task->total_user_time += timer_grab(&thread->user_timer);
task->total_system_time += timer_grab(&thread->system_timer);
task->c_switch += thread->c_switch;
task->p_switch += thread->p_switch;
task->ps_switch += thread->ps_switch;
queue_remove(&task->threads, thread, thread_t, task_threads);
task->thread_count--;
/*
* If the task is being halted, and there is only one thread
* left in the task after this one, then wakeup that thread.
*/
if (task->thread_count == 1 && task->halting)
thread_wakeup((event_t)&task->halting);
task_unlock(task);
lck_mtx_lock(&tasks_threads_lock);
queue_remove(&threads, thread, thread_t, threads);
threads_count--;
lck_mtx_unlock(&tasks_threads_lock);
thread_deallocate(thread);
(void)splsched();
simple_lock(&thread_terminate_lock);
}
assert_wait((event_t)&thread_terminate_queue, THREAD_UNINT);
simple_unlock(&thread_terminate_lock);
/* splsched */
thread_block((thread_continue_t)thread_terminate_daemon);
/*NOTREACHED*/
}
/*
* If a copy is currently being created, wait for it.
*/
xmm_obj_t
svm_get_stable_copy(
xmm_obj_t mobj)
{
assert(xmm_obj_lock_held(mobj));
while (MOBJ->copy_in_progress) {
MOBJ->copy_wanted = TRUE;
assert_wait(svm_copy_event(mobj), FALSE);
xmm_obj_unlock(mobj);
thread_block((void (*)(void)) 0);
xmm_obj_lock(mobj);
}
return MOBJ->copy;
}
/*
* thread_stop_freeze
* Block the thread in the kernel and freeze the processor set.
* return value:
* TRUE - the thread has blocked interruptibly, is stopped, and
* the processor set assignment is frozen
* FALSE - the thread is no longer in the processor set, so it
* isn't stopped, and the processor set assignment
* is released.
*/
int
thread_stop_freeze( thread_t thread, processor_set_t pset )
{
thread_act_t thr_act;
spl_t s;
/*
* hold it, and wait for it to stop.
*/
thr_act = thread_lock_act(thread);
thread_hold(thr_act);
act_unlock_thread(thr_act);
thread_stop(thread);
s = splsched();
wake_lock(thread);
while( thread->state & (TH_RUN|TH_UNINT) ) {
thread->wake_active = TRUE;
assert_wait((event_t)&thread->wake_active, FALSE);
wake_unlock(thread);
splx(s);
thread_block( (void (*)(void)) 0 );
(void) splsched();
wake_lock(thread);
}
/*
* Now, the thread has blocked uninterruptibly; freeze the
* assignment and make sure it's still part of the processor set.
*/
wake_unlock(thread);
thread_freeze(thread);
thread_lock(thread);
/*
* if the processor set has changed, release the freeze and
* then unstop it.
*/
if( thread->processor_set != pset ) {
thread_unlock(thread);
splx(s);
thread_unfreeze(thread);
thread_unstop(thread);
return FALSE;
}
thread_unlock(thread);
splx(s);
return TRUE;
}
nw_result mk_connection_open_internal(nw_ep local_ep, nw_address_1 rem_addr_1,
nw_address_2 rem_addr_2, nw_ep remote_ep) {
nw_result rc;
rc = (*devct[NW_DEVICE(rem_addr_1)].entry->open) (local_ep,
rem_addr_1, rem_addr_2,
remote_ep);
if (rc == NW_SYNCH) {
hect[local_ep].sig_waiter = current_thread();
assert_wait(0, TRUE);
simple_unlock(&nw_simple_lock);
thread_block((void (*)()) 0);
}
return rc;
}
static void
timer_call_remove_cyclic(cyclic_id_t cyclic)
{
wrap_timer_call_t *wrapTC = (wrap_timer_call_t *)cyclic;
while (!timer_call_cancel(&(wrapTC->call))) {
int ret = assert_wait(wrapTC, THREAD_UNINT);
ASSERT(ret == THREAD_WAITING);
wrapTC->when.cyt_interval = WAKEUP_REAPER;
ret = thread_block(THREAD_CONTINUE_NULL);
ASSERT(ret == THREAD_AWAKENED);
}
}
/* thread for calling back to a compressor's memory allocator
* Needed for Digital UNIX since it's VM can't handle requests
* for large amounts of memory without blocking. The thread
* provides a context in which we can call a memory allocator
* that may block.
*/
static void
ppp_comp_alloc(comp_state_t *cp)
{
int len, cmd;
unsigned char *compressor_options;
thread_t thread;
void *(*comp_allocator)();
#if defined(MAJOR_VERSION) && (MAJOR_VERSION <= 2)
/* In 2.x and earlier the argument gets passed
* in the thread structure itself. Yuck.
*/
thread = current_thread();
cp = thread->reply_port;
thread->reply_port = PORT_NULL;
#endif
for (;;) {
assert_wait((vm_offset_t)&cp->memreq.thread_status, TRUE);
thread_block();
if (thread_should_halt(current_thread()))
thread_halt_self();
cmd = cp->memreq.cmd;
compressor_options = &cp->memreq.comp_opts[0];
len = compressor_options[1];
if (cmd == PPPIO_XCOMP) {
cp->memreq.returned_mem = cp->xcomp->comp_alloc(compressor_options, len);
if (!cp->memreq.returned_mem) {
cp->memreq.thread_status = ENOSR;
} else {
cp->memreq.thread_status = 0;
}
} else {
cp->memreq.returned_mem = cp->rcomp->decomp_alloc(compressor_options, len);
if (!cp->memreq.returned_mem) {
cp->memreq.thread_status = ENOSR;
} else {
cp->memreq.thread_status = 0;
}
}
}
}
void
afs_osi_Sleep(void *event)
{
struct afs_event *evp;
int seq;
evp = afs_getevent(event);
seq = evp->seq;
while (seq == evp->seq) {
AFS_ASSERT_GLOCK();
assert_wait((vm_offset_t) (&evp->cond), 0);
AFS_GUNLOCK();
thread_block();
AFS_GLOCK();
}
relevent(evp);
}
/*
* thread_terminate_daemon:
*
* Perform final clean up for terminating threads.
*/
static void
thread_terminate_daemon(void)
{
thread_t thread;
task_t task;
(void)splsched();
simple_lock(&thread_terminate_lock);
while ((thread = (thread_t)dequeue_head(&thread_terminate_queue)) != THREAD_NULL) {
simple_unlock(&thread_terminate_lock);
(void)spllo();
task = thread->task;
task_lock(task);
task->total_user_time += timer_grab(&thread->user_timer);
task->total_system_time += timer_grab(&thread->system_timer);
task->c_switch += thread->c_switch;
task->p_switch += thread->p_switch;
task->ps_switch += thread->ps_switch;
queue_remove(&task->threads, thread, thread_t, task_threads);
task->thread_count--;
task_unlock(task);
mutex_lock(&tasks_threads_lock);
queue_remove(&threads, thread, thread_t, threads);
threads_count--;
mutex_unlock(&tasks_threads_lock);
thread_deallocate(thread);
(void)splsched();
simple_lock(&thread_terminate_lock);
}
assert_wait((event_t)&thread_terminate_queue, THREAD_UNINT);
simple_unlock(&thread_terminate_lock);
/* splsched */
thread_block((thread_continue_t)thread_terminate_daemon);
/*NOTREACHED*/
}
/*
* User-trappable
*/
kern_return_t evc_wait(natural_t ev_id)
{
spl_t s;
kern_return_t ret;
evc_t ev;
if ((ev_id >= MAX_EVCS) ||
((ev = all_eventcounters[ev_id]) == 0) ||
(ev->ev_id != ev_id) || (ev->sanity != ev))
return KERN_INVALID_ARGUMENT;
s = splsched();
simple_lock(&ev->lock);
/*
* The values assumed by the "count" field are
* as follows:
* 0 At initialization time, and with no
* waiting thread means no events pending;
* with waiting thread means the event
* was signalled and the thread not yet resumed
* -1 no events, there must be a waiting thread
* N>0 no waiting thread means N pending,
* with waiting thread N-1 pending.
*
*/
if (ev->count > 0) {
ev->count--;
ret = KERN_SUCCESS;
} else {
if (ev->waiting_thread == THREAD_NULL) {
ev->count--;
ev->waiting_thread = current_thread();
assert_wait((event_t) 0, TRUE); /* ifnot race */
simple_unlock(&ev->lock);
thread_block(evc_continue);
return KERN_SUCCESS;
}
ret = KERN_NO_SPACE; /* XX */
}
simple_unlock(&ev->lock);
splx(s);
return ret;
}
IOReturn IOFWSyncer::wait(bool autoRelease)
{
IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
if (threadMustStop) {
assert_wait((void *) &threadMustStop, false);
IOSimpleLockUnlockEnableInterrupt(guardLock, is);
thread_block(THREAD_CONTINUE_NULL);
}
else
IOSimpleLockUnlockEnableInterrupt(guardLock, is);
IOReturn result = fResult; // Pick up before auto deleting!
if(autoRelease)
release();
return result;
}
/*
* If xmm_object is being terminated, wait for it.
*/
void
xmm_object_wait(
ipc_port_t memory_object)
{
while (! IP_WAS_REMOTE(memory_object) &&
((int)memory_object->ip_norma_xmm_object | 1) ==
((int)memory_object | 1)) {
/*
* Use the low bit to flag someone is waiting
*/
memory_object->ip_norma_xmm_object = (ipc_port_t)
((int)memory_object->ip_norma_xmm_object | 1);
assert_wait((event_t) &memory_object->ip_norma_xmm_object, FALSE);
ip_unlock(memory_object);
thread_block((void (*)(void)) 0);
ip_lock(memory_object);
}
}
void
lck_rw_lock_shared_gen(lck_rw_t *lck)
{
int i;
wait_result_t res;
lck_rw_ilk_lock(lck);
while ((lck->lck_rw_want_excl || lck->lck_rw_want_upgrade) &&
((lck->lck_rw_shared_count == 0) || (lck->lck_rw_priv_excl))) {
i = lock_wait_time[1];
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_RW_LCK_SHARED_CODE) | DBG_FUNC_START,
(int)lck, lck->lck_rw_want_excl, lck->lck_rw_want_upgrade, i, 0);
if (i != 0) {
lck_rw_ilk_unlock(lck);
while (--i != 0 &&
(lck->lck_rw_want_excl || lck->lck_rw_want_upgrade) &&
((lck->lck_rw_shared_count == 0) || (lck->lck_rw_priv_excl)))
continue;
lck_rw_ilk_lock(lck);
}
if ((lck->lck_rw_want_excl || lck->lck_rw_want_upgrade) &&
((lck->lck_rw_shared_count == 0) || (lck->lck_rw_priv_excl))) {
lck->lck_rw_waiting = TRUE;
res = assert_wait((event_t)(((unsigned int*)lck)+((sizeof(lck_rw_t)-1)/sizeof(unsigned int))), THREAD_UNINT);
if (res == THREAD_WAITING) {
lck_rw_ilk_unlock(lck);
res = thread_block(THREAD_CONTINUE_NULL);
lck_rw_ilk_lock(lck);
}
}
KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_LOCKS, LCK_RW_LCK_SHARED_CODE) | DBG_FUNC_END,
(int)lck, lck->lck_rw_want_excl, lck->lck_rw_want_upgrade, res, 0);
}
lck->lck_rw_shared_count++;
lck_rw_ilk_unlock(lck);
}
static boolean_t
proc_init_wqptr_or_wait(struct proc *p) {
proc_lock(p);
if (p->p_wqptr == NULL){
p->p_wqptr = WQPTR_IS_INITING_VALUE;
proc_unlock(p);
return TRUE;
} else if (p->p_wqptr == WQPTR_IS_INITING_VALUE){
assert_wait(&p->p_wqptr, THREAD_UNINT);
proc_unlock(p);
thread_block(THREAD_CONTINUE_NULL);
return FALSE;
} else {
proc_unlock(p);
return FALSE;
}
}
/*
* Finds a virtual address in the reserved range to map the vm_page.
* It may block waiting for free entries in the reserved range only
* if can_block is TRUE.
*/
vm_offset_t kkt_find_mapping(vm_page_t m, vm_offset_t offset, boolean_t can_block)
{
unsigned int ind_range;
vm_offset_t virt_addr;
if (kkt_virt_free_index == 0) {
if (can_block) {
simple_lock(&kkt_virt_lock);
while (kkt_virt_free_index == 0) {
simple_unlock(&kkt_virt_lock);
assert_wait((event_t) kkt_virt_status, FALSE);
thread_block((void (*)(void)) 0);
simple_lock(&kkt_virt_lock);
}
simple_unlock(&kkt_virt_lock);
}
else {
/* XXX we cannot block because of locks held */
panic("kkt_find_mapping: virtual range full and cannot block\n");
}
}
virt_addr = (vm_offset_t) 0;
simple_lock(&kkt_virt_lock);
for (ind_range = 0; ind_range < KKT_VIRT_SIZE; ind_range++) {
if (kkt_virt_status[ind_range] == FREE_VADDR) {
kkt_virt_status[ind_range] = MAP_VADDR;
kkt_virt_vmp[ind_range] = m;
kkt_virt_free_index--;
virt_addr = kkt_virt_start_vaddr + (ind_range * PAGE_SIZE);
break;
}
}
simple_unlock(&kkt_virt_lock);
assert(virt_addr);
return(virt_addr + offset);
}
nw_result mk_connection_accept(nw_ep ep, nw_buffer_t msg,
nw_ep_t new_epp) {
nw_result rc;
nw_pv_t pv;
nw_lock();
if (ep >= MAX_EP || (pv = hect[ep].pv) == NULL) {
rc = NW_BAD_EP;
} else {
while (pv != NULL && pv->owner != current_task())
pv = pv->next;
if (pv == NULL) {
rc = NW_PROT_VIOLATION;
} else if ((char *) msg < pv->buf_start ||
(char *) msg + sizeof(nw_buffer_s) > pv->buf_end ||
!msg->buf_used ||
(char *) msg + msg->buf_length > pv->buf_end) {
rc = NW_BAD_BUFFER;
} else if (new_epp != NULL &&
(invalid_user_access(current_task()->map, (vm_offset_t) new_epp,
(vm_offset_t) new_epp + sizeof(nw_ep) - 1,
VM_PROT_READ | VM_PROT_WRITE) ||
(*new_epp != 0 && *new_epp != ep))) {
rc = NW_INVALID_ARGUMENT;
} else {
rc = (*(devct[NW_DEVICE(ect[ep].conn->peer.rem_addr_1)].entry->accept))
(ep, msg, new_epp);
if (rc == NW_SYNCH) {
hect[ep].sig_waiter = current_thread();
assert_wait(0, TRUE);
current_thread()->nw_ep_waited = NULL;
simple_unlock(&nw_simple_lock);
thread_block(mk_return);
}
}
}
nw_unlock();
return rc;
}
