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Simplify use of custom data-flow signal handlers

This commit is contained in:
Norman Feske 2012-04-14 02:07:37 +02:00
parent 8b96f44003
commit cb9b2724de
1 changed files with 52 additions and 16 deletions
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68
os/include/packet_stream_tx/rpc_object.h
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@ -28,21 +28,11 @@ namespace Packet_stream_tx {
Genode::Capability<CHANNEL> _cap;
typename CHANNEL::Sink _sink;
Genode::Signal_context_capability _sigh_ready_to_ack;
Genode::Signal_context_capability _sigh_packet_avail;
public:
/*
* Accessors for server-side signal handlers
*
* The functions are virtual to enable derived classes to supply
* custom handlers for data-flow signals.
*/
virtual Genode::Signal_context_capability sigh_ready_to_ack() {
return _sink.sigh_ready_to_ack(); }
virtual Genode::Signal_context_capability sigh_packet_avail() {
return _sink.sigh_packet_avail(); }
/**
* Constructor
*
@ -53,13 +43,56 @@ namespace Packet_stream_tx {
*/
Rpc_object(Genode::Dataspace_capability ds,
Genode::Rpc_entrypoint &ep)
: _ep(ep), _cap(_ep.manage(this)), _sink(ds) { }
:
_ep(ep), _cap(_ep.manage(this)), _sink(ds),
/* init signal handlers with default handlers of sink */
_sigh_ready_to_ack(_sink.sigh_ready_to_ack()),
_sigh_packet_avail(_sink.sigh_packet_avail())
{ }
/**
* Destructor
*/
~Rpc_object() { _ep.dissolve(this); }
/*
* The 'sigh_packet_avail()' and 'sigh_ready_to_ack()' functions
* may be called at session-creation time to override the default
* data-flow signal handlers as provided by the packet-stream sink.
* The default handlers let the server block in the event of data
* congestion. By installing custom signal handlers, a server
* implementation is able to avoid blocking for a single event by
* facilitating the use of a select-like mode of operation.
*
* Note that calling these functions after the finished creation of
* the session has no effect because the client queries the signal
* handlers only once at session-creation time.
*/
/**
* Override default handler for server-side ready-to-ack signals
*/
void sigh_ready_to_ack(Genode::Signal_context_capability sigh) {
_sigh_ready_to_ack = sigh; }
/**
* Override default handler for server-side packet-avail signals
*
* Must be called at constuction time only.
*/
void sigh_packet_avail(Genode::Signal_context_capability sigh) {
_sigh_packet_avail = sigh; }
typename CHANNEL::Sink *sink() { return &_sink; }
Genode::Capability<CHANNEL> cap() const { return _cap; }
/*******************
** RPC functions **
*******************/
Genode::Dataspace_capability dataspace() { return _sink.dataspace(); }
void sigh_ready_to_submit(Genode::Signal_context_capability sigh) {
@ -68,9 +101,12 @@ namespace Packet_stream_tx {
void sigh_ack_avail(Genode::Signal_context_capability sigh) {
_sink.register_sigh_ack_avail(sigh); }
typename CHANNEL::Sink *sink() { return &_sink; }
virtual Genode::Signal_context_capability sigh_ready_to_ack() {
return _sigh_ready_to_ack; }
virtual Genode::Signal_context_capability sigh_packet_avail() {
return _sigh_packet_avail; }
Genode::Capability<CHANNEL> cap() const { return _cap; }
};
}