#include <ipc/ipc_pset.h>
#include <ipc/ipc_space.h>
-#include <ddb/tr.h>
+#ifdef __LP64__
+#include <vm/vm_map.h>
+#endif
#if CONFIG_MACF_MACH
#include <security/mac_mach_internal.h>
int ipc_mqueue_full; /* address is event for queue space */
int ipc_mqueue_rcv; /* address is event for message arrival */
-#define TR_ENABLE 0
-
/* forward declarations */
void ipc_mqueue_receive_results(wait_result_t result);
boolean_t is_set)
{
if (is_set) {
- wait_queue_set_init(&mqueue->imq_set_queue, SYNC_POLICY_FIFO);
+ wait_queue_set_init(&mqueue->imq_set_queue, SYNC_POLICY_FIFO|SYNC_POLICY_PREPOST);
} else {
wait_queue_init(&mqueue->imq_wait_queue, SYNC_POLICY_FIFO);
ipc_kmsg_queue_init(&mqueue->imq_messages);
for (;;) {
thread_t th;
+ mach_msg_size_t msize;
th = wait_queue_wakeup64_identity_locked(
port_waitq,
if (th == THREAD_NULL)
goto leave;
+ /*
+ * If the receiver waited with a facility not directly
+ * related to Mach messaging, then it isn't prepared to get
+ * handed the message directly. Just set it running, and
+ * go look for another thread that can.
+ */
+ if (th->ith_state != MACH_RCV_IN_PROGRESS) {
+ thread_unlock(th);
+ continue;
+ }
+
/*
* Found a receiver. see if they can handle the message
* correctly (the message is not too large for them, or
* the list and let them go back and figure it out and
* just move onto the next.
*/
+ msize = ipc_kmsg_copyout_size(kmsg, th->map);
if (th->ith_msize <
- kmsg->ikm_header->msgh_size +
- REQUESTED_TRAILER_SIZE(th->ith_option)) {
+ (msize + REQUESTED_TRAILER_SIZE(th->ith_option))) {
th->ith_state = MACH_RCV_TOO_LARGE;
- th->ith_msize = kmsg->ikm_header->msgh_size;
+ th->ith_msize = msize;
if (th->ith_option & MACH_RCV_LARGE) {
/*
* let him go without message
*/
+ th->ith_receiver_name = port_mqueue->imq_receiver_name;
th->ith_kmsg = IKM_NULL;
th->ith_seqno = 0;
thread_unlock(th);
mach_msg_return_t
ipc_mqueue_send(
ipc_mqueue_t mqueue,
- ipc_kmsg_t kmsg,
+ ipc_kmsg_t kmsg,
mach_msg_option_t option,
- mach_msg_timeout_t send_timeout)
+ mach_msg_timeout_t send_timeout,
+ spl_t s)
{
int wresult;
- spl_t s;
/*
* Don't block if:
* 2) Caller used the MACH_SEND_ALWAYS internal option.
* 3) Message is sent to a send-once right.
*/
- s = splsched();
- imq_lock(mqueue);
-
if (!imq_full(mqueue) ||
(!imq_full_kernel(mqueue) &&
((option & MACH_SEND_ALWAYS) ||
return MACH_SEND_INTERRUPTED;
case THREAD_RESTART:
+ /* mqueue is being destroyed */
+ return MACH_SEND_INVALID_DEST;
default:
panic("ipc_mqueue_send");
}
register ipc_mqueue_t mqueue,
register ipc_kmsg_t kmsg)
{
-
spl_t s;
/*
for (;;) {
wait_queue_t waitq = &mqueue->imq_wait_queue;
thread_t receiver;
+ mach_msg_size_t msize;
receiver = wait_queue_wakeup64_identity_locked(
waitq,
ipc_kmsg_enqueue_macro(&mqueue->imq_messages, kmsg);
break;
}
-
+
+ /*
+ * If the receiver waited with a facility not directly
+ * related to Mach messaging, then it isn't prepared to get
+ * handed the message directly. Just set it running, and
+ * go look for another thread that can.
+ */
+ if (receiver->ith_state != MACH_RCV_IN_PROGRESS) {
+ thread_unlock(receiver);
+ continue;
+ }
+
+
/*
* We found a waiting thread.
* If the message is too large or the scatter list is too small
* the thread we wake up will get that as its status.
*/
+ msize = ipc_kmsg_copyout_size(kmsg, receiver->map);
if (receiver->ith_msize <
- (kmsg->ikm_header->msgh_size) +
- REQUESTED_TRAILER_SIZE(receiver->ith_option)) {
- receiver->ith_msize = kmsg->ikm_header->msgh_size;
+ (msize + REQUESTED_TRAILER_SIZE(receiver->ith_option))) {
+ receiver->ith_msize = msize;
receiver->ith_state = MACH_RCV_TOO_LARGE;
} else {
receiver->ith_state = MACH_MSG_SUCCESS;
void
ipc_mqueue_receive(
- ipc_mqueue_t mqueue,
- mach_msg_option_t option,
- mach_msg_size_t max_size,
- mach_msg_timeout_t rcv_timeout,
- int interruptible)
+ ipc_mqueue_t mqueue,
+ mach_msg_option_t option,
+ mach_msg_size_t max_size,
+ mach_msg_timeout_t rcv_timeout,
+ int interruptible)
+{
+ wait_result_t wresult;
+ thread_t self = current_thread();
+
+ wresult = ipc_mqueue_receive_on_thread(mqueue, option, max_size,
+ rcv_timeout, interruptible,
+ self);
+ if (wresult == THREAD_NOT_WAITING)
+ return;
+
+ if (wresult == THREAD_WAITING) {
+ counter((interruptible == THREAD_ABORTSAFE) ?
+ c_ipc_mqueue_receive_block_user++ :
+ c_ipc_mqueue_receive_block_kernel++);
+
+ if (self->ith_continuation)
+ thread_block(ipc_mqueue_receive_continue);
+ /* NOTREACHED */
+
+ wresult = thread_block(THREAD_CONTINUE_NULL);
+ }
+ ipc_mqueue_receive_results(wresult);
+}
+
+wait_result_t
+ipc_mqueue_receive_on_thread(
+ ipc_mqueue_t mqueue,
+ mach_msg_option_t option,
+ mach_msg_size_t max_size,
+ mach_msg_timeout_t rcv_timeout,
+ int interruptible,
+ thread_t thread)
{
ipc_kmsg_queue_t kmsgs;
wait_result_t wresult;
- thread_t self;
- uint64_t deadline;
+ uint64_t deadline;
spl_t s;
#if CONFIG_MACF_MACH
ipc_labelh_t lh;
s = splsched();
imq_lock(mqueue);
- self = current_thread();
if (imq_is_set(mqueue)) {
- wait_queue_link_t wql;
- ipc_mqueue_t port_mq;
queue_t q;
- q = &mqueue->imq_setlinks;
+ q = &mqueue->imq_preposts;
/*
* If we are waiting on a portset mqueue, we need to see if
- * any of the member ports have work for us. If so, try to
- * deliver one of those messages. By holding the portset's
+ * any of the member ports have work for us. Ports that
+ * have (or recently had) messages will be linked in the
+ * prepost queue for the portset. By holding the portset's
* mqueue lock during the search, we tie up any attempts by
* mqueue_deliver or portset membership changes that may
- * cross our path. But this is a lock order violation, so we
- * have to do it "softly." If we don't find a message waiting
- * for us, we will assert our intention to wait while still
- * holding that lock. When we release the lock, the deliver/
- * change will succeed and find us.
+ * cross our path.
*/
search_set:
- queue_iterate(q, wql, wait_queue_link_t, wql_setlinks) {
+ while(!queue_empty(q)) {
+ wait_queue_link_t wql;
+ ipc_mqueue_t port_mq;
+
+ queue_remove_first(q, wql, wait_queue_link_t, wql_preposts);
+ assert(!wql_is_preposted(wql));
+
+ /*
+ * This is a lock order violation, so we have to do it
+ * "softly," putting the link back on the prepost list
+ * if it fails (at the tail is fine since the order of
+ * handling messages from different sources in a set is
+ * not guaranteed and we'd like to skip to the next source
+ * if one is available).
+ */
port_mq = (ipc_mqueue_t)wql->wql_queue;
- kmsgs = &port_mq->imq_messages;
-
if (!imq_lock_try(port_mq)) {
+ queue_enter(q, wql, wait_queue_link_t, wql_preposts);
imq_unlock(mqueue);
splx(s);
mutex_pause(0);
}
/*
- * If there is still a message to be had, we will
- * try to select it (may not succeed because of size
- * and options). In any case, we deliver those
- * results back to the user.
- *
- * We also move the port's linkage to the tail of the
- * list for this set (fairness). Future versions will
- * sort by timestamp or priority.
+ * If there are no messages on this queue, just skip it
+ * (we already removed the link from the set's prepost queue).
*/
+ kmsgs = &port_mq->imq_messages;
if (ipc_kmsg_queue_first(kmsgs) == IKM_NULL) {
imq_unlock(port_mq);
continue;
}
- queue_remove(q, wql, wait_queue_link_t, wql_setlinks);
- queue_enter(q, wql, wait_queue_link_t, wql_setlinks);
+
+ /*
+ * There are messages, so reinsert the link back
+ * at the tail of the preposted queue (for fairness)
+ * while we still have the portset mqueue locked.
+ */
+ queue_enter(q, wql, wait_queue_link_t, wql_preposts);
imq_unlock(mqueue);
- ipc_mqueue_select(port_mq, option, max_size);
+ /*
+ * Continue on to handling the message with just
+ * the port mqueue locked.
+ */
+ ipc_mqueue_select_on_thread(port_mq, option, max_size, thread);
imq_unlock(port_mq);
#if CONFIG_MACF_MACH
- if (self->ith_kmsg != NULL &&
- self->ith_kmsg->ikm_sender != NULL) {
- lh = self->ith_kmsg->ikm_sender->label;
- task = current_task();
- tasklabel_lock(task);
+ if (thread->task != TASK_NULL &&
+ thread->ith_kmsg != NULL &&
+ thread->ith_kmsg->ikm_sender != NULL) {
+ lh = thread->ith_kmsg->ikm_sender->label;
+ tasklabel_lock(thread->task);
ip_lock(lh->lh_port);
- rc = mac_port_check_receive(&task->maclabel,
- &lh->lh_label);
+ rc = mac_port_check_receive(&thread->task->maclabel,
+ &lh->lh_label);
ip_unlock(lh->lh_port);
- tasklabel_unlock(task);
+ tasklabel_unlock(thread->task);
if (rc)
- self->ith_state = MACH_RCV_INVALID_DATA;
+ thread->ith_state = MACH_RCV_INVALID_DATA;
}
#endif
splx(s);
- return;
+ return THREAD_NOT_WAITING;
}
*/
kmsgs = &mqueue->imq_messages;
if (ipc_kmsg_queue_first(kmsgs) != IKM_NULL) {
- ipc_mqueue_select(mqueue, option, max_size);
+ ipc_mqueue_select_on_thread(mqueue, option, max_size, thread);
imq_unlock(mqueue);
#if CONFIG_MACF_MACH
- if (self->ith_kmsg != NULL &&
- self->ith_kmsg->ikm_sender != NULL) {
- lh = self->ith_kmsg->ikm_sender->label;
- task = current_task();
- tasklabel_lock(task);
+ if (thread->task != TASK_NULL &&
+ thread->ith_kmsg != NULL &&
+ thread->ith_kmsg->ikm_sender != NULL) {
+ lh = thread->ith_kmsg->ikm_sender->label;
+ tasklabel_lock(thread->task);
ip_lock(lh->lh_port);
- rc = mac_port_check_receive(&task->maclabel,
- &lh->lh_label);
+ rc = mac_port_check_receive(&thread->task->maclabel,
+ &lh->lh_label);
ip_unlock(lh->lh_port);
- tasklabel_unlock(task);
+ tasklabel_unlock(thread->task);
if (rc)
- self->ith_state = MACH_RCV_INVALID_DATA;
+ thread->ith_state = MACH_RCV_INVALID_DATA;
}
#endif
splx(s);
- return;
+ return THREAD_NOT_WAITING;
}
}
-
+
/*
* Looks like we'll have to block. The mqueue we will
* block on (whether the set's or the local port's) is
if (rcv_timeout == 0) {
imq_unlock(mqueue);
splx(s);
- self->ith_state = MACH_RCV_TIMED_OUT;
- return;
+ thread->ith_state = MACH_RCV_TIMED_OUT;
+ return THREAD_NOT_WAITING;
}
}
- thread_lock(self);
- self->ith_state = MACH_RCV_IN_PROGRESS;
- self->ith_option = option;
- self->ith_msize = max_size;
+ thread_lock(thread);
+ thread->ith_state = MACH_RCV_IN_PROGRESS;
+ thread->ith_option = option;
+ thread->ith_msize = max_size;
if (option & MACH_RCV_TIMEOUT)
clock_interval_to_deadline(rcv_timeout, 1000*NSEC_PER_USEC, &deadline);
deadline = 0;
wresult = wait_queue_assert_wait64_locked(&mqueue->imq_wait_queue,
- IPC_MQUEUE_RECEIVE,
- interruptible, deadline,
- self);
- thread_unlock(self);
+ IPC_MQUEUE_RECEIVE,
+ interruptible, deadline,
+ thread);
+ /* preposts should be detected above, not here */
+ if (wresult == THREAD_AWAKENED)
+ panic("ipc_mqueue_receive_on_thread: sleep walking");
+
+ thread_unlock(thread);
imq_unlock(mqueue);
splx(s);
-
- if (wresult == THREAD_WAITING) {
- counter((interruptible == THREAD_ABORTSAFE) ?
- c_ipc_mqueue_receive_block_user++ :
- c_ipc_mqueue_receive_block_kernel++);
-
- if (self->ith_continuation)
- thread_block(ipc_mqueue_receive_continue);
- /* NOTREACHED */
-
- wresult = thread_block(THREAD_CONTINUE_NULL);
- }
- ipc_mqueue_receive_results(wresult);
+ return wresult;
}
/*
- * Routine: ipc_mqueue_select
+ * Routine: ipc_mqueue_select_on_thread
* Purpose:
* A receiver discovered that there was a message on the queue
* before he had to block. Pick the message off the queue and
- * "post" it to himself.
+ * "post" it to thread.
* Conditions:
* mqueue locked.
+ * thread not locked.
* There is a message.
* Returns:
* MACH_MSG_SUCCESS Actually selected a message for ourselves.
* MACH_RCV_TOO_LARGE May or may not have pull it, but it is large
*/
void
-ipc_mqueue_select(
+ipc_mqueue_select_on_thread(
ipc_mqueue_t mqueue,
mach_msg_option_t option,
- mach_msg_size_t max_size)
+ mach_msg_size_t max_size,
+ thread_t thread)
{
- thread_t self = current_thread();
ipc_kmsg_t kmsg;
- mach_msg_return_t mr;
+ mach_msg_return_t mr = MACH_MSG_SUCCESS;
mach_msg_size_t rcv_size;
- mr = MACH_MSG_SUCCESS;
-
-
/*
* Do some sanity checking of our ability to receive
* before pulling the message off the queue.
* the queue, instead return the appropriate error
* (and size needed).
*/
- rcv_size = ipc_kmsg_copyout_size(kmsg, self->map);
+ rcv_size = ipc_kmsg_copyout_size(kmsg, thread->map);
if (rcv_size + REQUESTED_TRAILER_SIZE(option) > max_size) {
mr = MACH_RCV_TOO_LARGE;
if (option & MACH_RCV_LARGE) {
- self->ith_kmsg = IKM_NULL;
- self->ith_msize = rcv_size;
- self->ith_seqno = 0;
- self->ith_state = mr;
+ thread->ith_receiver_name = mqueue->imq_receiver_name;
+ thread->ith_kmsg = IKM_NULL;
+ thread->ith_msize = rcv_size;
+ thread->ith_seqno = 0;
+ thread->ith_state = mr;
return;
}
}
ipc_kmsg_rmqueue_first_macro(&mqueue->imq_messages, kmsg);
ipc_mqueue_release_msgcount(mqueue);
- self->ith_seqno = mqueue->imq_seqno++;
- self->ith_kmsg = kmsg;
- self->ith_state = mr;
+ thread->ith_seqno = mqueue->imq_seqno++;
+ thread->ith_kmsg = kmsg;
+ thread->ith_state = mr;
current_task()->messages_received++;
return;
}
+/*
+ * Routine: ipc_mqueue_peek
+ * Purpose:
+ * Peek at a message queue to see if it has any messages
+ * (in it or contained message queues for a set).
+ *
+ * Conditions:
+ * Locks may be held by callers, so this routine cannot block.
+ * Caller holds reference on the message queue.
+ */
+int
+ipc_mqueue_peek(ipc_mqueue_t mq)
+{
+ wait_queue_link_t wql;
+ queue_t q;
+ spl_t s;
+
+ if (!imq_is_set(mq))
+ return (ipc_kmsg_queue_first(&mq->imq_messages) != IKM_NULL);
+
+ /*
+ * Don't block trying to get the lock.
+ */
+ s = splsched();
+ if (!imq_lock_try(mq)) {
+ splx(s);
+ return -1;
+ }
+
+ /*
+ * peek at the contained port message queues, return as soon as
+ * we spot a message on one of the message queues linked on the
+ * prepost list.
+ */
+ q = &mq->imq_preposts;
+ queue_iterate(q, wql, wait_queue_link_t, wql_preposts) {
+ ipc_mqueue_t port_mq = (ipc_mqueue_t)wql->wql_queue;
+ ipc_kmsg_queue_t kmsgs = &port_mq->imq_messages;
+
+ if (ipc_kmsg_queue_first(kmsgs) != IKM_NULL) {
+ imq_unlock(mq);
+ splx(s);
+ return 1;
+ }
+ }
+ imq_unlock(mq);
+ splx(s);
+ return 0;
+}
+
/*
* Routine: ipc_mqueue_destroy
* Purpose:
wait_queue_wakeup64_all_locked(
&mqueue->imq_wait_queue,
IPC_MQUEUE_FULL,
- THREAD_AWAKENED,
+ THREAD_RESTART,
FALSE);
kmqueue = &mqueue->imq_messages;
projects / apple / xnu.git / blobdiff