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hw: destruct IPC end-nodes

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ref #589
This commit is contained in:
Martin Stein 2013-09-16 17:01:52 +02:00 committed by Norman Feske
parent de87fa1b5c
commit 611cd95eb3
2 changed files with 166 additions and 39 deletions
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146
base-hw/src/core/kernel/ipc_node.h
View File

@ -54,12 +54,13 @@ class Kernel::Ipc_node
void * base;
size_t size;
Ipc_node * origin;
Ipc_node * src;
};
Message_fifo _request_queue;
Message_buf _inbuf;
Message_buf _outbuf;
Ipc_node * _outbuf_dst;
State _state;
/**
@ -75,7 +76,7 @@ class Kernel::Ipc_node
/* fetch message */
Genode::memcpy(_inbuf.base, r->base, r->size);
_inbuf.size = r->size;
_inbuf.origin = r->origin;
_inbuf.src = r->src;
/* update state */
_state = PREPARE_REPLY;
@ -101,7 +102,7 @@ class Kernel::Ipc_node
/* update state */
if (_state != PREPARE_AND_AWAIT_REPLY) { _state = INACTIVE; }
else { _state = PREPARE_REPLY; }
_has_received(_inbuf.size);
_await_ipc_succeeded(_inbuf.size);
}
/**
@ -112,7 +113,7 @@ class Kernel::Ipc_node
/* directly receive request if we've awaited it */
if (_state == AWAIT_REQUEST) {
_receive_request(r);
_has_received(_inbuf.size);
_await_ipc_succeeded(_inbuf.size);
return;
}
/* cannot receive yet, so queue request */
@ -120,33 +121,97 @@ class Kernel::Ipc_node
}
/**
* IPC node waits for a message to receive to its inbuffer
* Cancel all requests in request queue
*/
virtual void _awaits_receipt() = 0;
void _cancel_request_queue()
{
while (1) {
Message_buf * const r = _request_queue.dequeue();
if (!r) { return; }
r->src->_outbuf_request_cancelled();
}
}
/**
* IPC node has received a message in its inbuffer
*
* \param s size of the message
* Cancel request in outgoing buffer
*/
virtual void _has_received(size_t const s) = 0;
void _cancel_outbuf_request()
{
if (_outbuf_dst) {
_outbuf_dst->_announced_request_cancelled(&_outbuf);
_outbuf_dst = 0;
}
}
/**
* Cancel request in incoming buffer
*/
void _cancel_inbuf_request()
{
if (_inbuf.src) {
_inbuf.src->_outbuf_request_cancelled();
_inbuf.src = 0;
}
}
/**
* A request 'r' in inbuf or request queue was cancelled by sender
*/
void _announced_request_cancelled(Message_buf * const r)
{
if (_inbuf.src == r->src) {
_inbuf.src = 0;
return;
}
_request_queue.remove(r);
}
/**
* The request in the outbuf was cancelled by receiver
*/
void _outbuf_request_cancelled()
{
if (_outbuf_dst) {
_outbuf_dst = 0;
if (!_inbuf.src) { _state = INACTIVE; }
else { _state = PREPARE_REPLY; }
_await_ipc_failed();
}
}
/**
* IPC node received a request without waiting
*/
virtual void _received_ipc_request(size_t const s) = 0;
/**
* IPC node started waiting for message receipt
*/
virtual void _await_ipc() = 0;
/**
* IPC node returned from waiting due to message receipt
*
* \param s size of incoming message
*/
virtual void _await_ipc_succeeded(size_t const s) = 0;
/**
* IPC node returned from waiting due to cancellation
*/
virtual void _await_ipc_failed() = 0;
public:
/**
* Construct an initially inactive IPC node
* Constructor
*/
Ipc_node() : _state(INACTIVE)
{
_inbuf.size = 0;
_outbuf.size = 0;
_inbuf.src = 0;
_outbuf_dst = 0;
}
/**
* Destructor
*/
virtual ~Ipc_node() { }
/**
* Send a request and wait for the according reply
*
@ -156,7 +221,7 @@ class Kernel::Ipc_node
* \param inbuf_base base of the reply buffer
* \param inbuf_size size of the reply buffer
*/
void send_request_await_reply(Ipc_node * const dest,
void send_request_await_reply(Ipc_node * const dst,
void * const req_base,
size_t const req_size,
void * const inbuf_base,
@ -168,19 +233,21 @@ class Kernel::Ipc_node
/* prepare transmission of request message */
_outbuf.base = req_base;
_outbuf.size = req_size;
_outbuf.origin = this;
_outbuf.src = this;
_outbuf_dst = dst;
/* prepare reception of reply message */
_inbuf.base = inbuf_base;
_inbuf.size = inbuf_size;
/* don't clear '_inbuf.origin' because we might prepare a reply */
/* update state */
if (_state != PREPARE_REPLY) { _state = AWAIT_REPLY; }
else { _state = PREPARE_AND_AWAIT_REPLY; }
_awaits_receipt();
_await_ipc();
/* announce request */
dest->_announce_request(&_outbuf);
dst->_announce_request(&_outbuf);
}
/**
@ -198,16 +265,17 @@ class Kernel::Ipc_node
/* prepare receipt of request */
_inbuf.base = inbuf_base;
_inbuf.size = inbuf_size;
_inbuf.src = 0;
/* if anybody already announced a request receive it */
if (!_request_queue.empty()) {
_receive_request(_request_queue.dequeue());
_has_received(_inbuf.size);
_received_ipc_request(_inbuf.size);
return;
}
/* no request announced, so wait */
_state = AWAIT_REQUEST;
_awaits_receipt();
_await_ipc();
}
/**
@ -221,19 +289,41 @@ class Kernel::Ipc_node
{
/* reply to the last request if we have to */
if (_state == PREPARE_REPLY) {
_inbuf.origin->_receive_reply(reply_base, reply_size);
if (_inbuf.src) {
_inbuf.src->_receive_reply(reply_base, reply_size);
_inbuf.src = 0;
}
_state = INACTIVE;
}
}
/**
* Stop waiting for a receipt if in a waiting state
* Destructor
*/
~Ipc_node()
{
_cancel_request_queue();
_cancel_inbuf_request();
_cancel_outbuf_request();
}
/**
* If IPC node waits, cancel '_outbuf' to stop waiting
*/
void cancel_waiting()
{
if (_state == PREPARE_AND_AWAIT_REPLY) { _state = PREPARE_REPLY; }
if (_state == AWAIT_REPLY || _state == AWAIT_REQUEST) {
switch (_state) {
case AWAIT_REPLY:
_cancel_outbuf_request();
_state = INACTIVE;
_await_ipc_failed();
return;
case PREPARE_AND_AWAIT_REPLY:
_cancel_outbuf_request();
_state = PREPARE_REPLY;
_await_ipc_failed();
return;
default: return;
}
}
};

59
base-hw/src/core/kernel/thread.h
View File

@ -172,21 +172,12 @@ class Kernel::Thread
** Ipc_node **
**************/
void _has_received(size_t const s)
void _received_ipc_request(size_t const s)
{
switch (_state) {
case AWAIT_IPC:
_schedule();
case SCHEDULED:
user_arg_0(s);
return;
case AWAIT_PAGER_IPC:
_schedule();
return;
case AWAIT_PAGER:
/* pager replied before pagefault has been resolved */
_state = AWAIT_RESUME;
return;
default:
PERR("wrong thread state to receive IPC");
crash();
@ -194,7 +185,7 @@ class Kernel::Thread
}
}
void _awaits_receipt()
void _await_ipc()
{
switch (_state) {
case SCHEDULED:
@ -209,6 +200,52 @@ class Kernel::Thread
}
}
void _await_ipc_succeeded(size_t const s)
{
switch (_state) {
case AWAIT_IPC:
_schedule();
user_arg_0(s);
return;
case AWAIT_PAGER_IPC:
_schedule();
return;
case AWAIT_PAGER:
_state = AWAIT_RESUME;
return;
default:
PERR("wrong thread state to receive IPC");
crash();
return;
}
}
void _await_ipc_failed()
{
switch (_state) {
case AWAIT_IPC:
PERR("failed to receive IPC");
crash();
return;
case SCHEDULED:
PERR("failed to receive IPC");
crash();
return;
case AWAIT_PAGER_IPC:
PERR("failed to get pagefault resolved");
crash();
return;
case AWAIT_PAGER:
PERR("failed to get pagefault resolved");
crash();
return;
default:
PERR("wrong thread state to cancel IPC");
crash();
return;
}
}
/***************
** Irq_owner **