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Simplify use of custom data-flow signal handlers 

This is analogue to the changes done in packet_stream_tx in commit:
cb9b2724de
This commit is contained in:
Stefan Kalkowski 2013-05-27 14:41:32 +02:00 committed by Norman Feske
parent 8fae7131c8
commit 153429268e
1 changed files with 52 additions and 16 deletions
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68
os/include/packet_stream_rx/rpc_object.h
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@ -28,21 +28,11 @@ namespace Packet_stream_rx {
Genode::Capability<CHANNEL> _cap;
typename CHANNEL::Source _source;
Genode::Signal_context_capability _sigh_ready_to_submit;
Genode::Signal_context_capability _sigh_ack_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_submit() {
return _source.sigh_ready_to_submit(); }
virtual Genode::Signal_context_capability sigh_ack_avail() {
return _source.sigh_ack_avail(); }
/**
* Constructor
*
@ -56,13 +46,56 @@ namespace Packet_stream_rx {
Rpc_object(Genode::Dataspace_capability ds,
Genode::Range_allocator *buffer_alloc,
Genode::Rpc_entrypoint &ep)
: _ep(ep), _cap(_ep.manage(this)), _source(buffer_alloc, ds) { }
: _ep(ep), _cap(_ep.manage(this)), _source(buffer_alloc, ds),
/* init signal handlers with default handlers of source */
_sigh_ready_to_submit(_source.sigh_ready_to_submit()),
_sigh_ack_avail(_source.sigh_ack_avail()) { }
/**
* Destructor
*/
~Rpc_object() { _ep.dissolve(this); }
/*
* The 'sigh_ack_avail()' and 'sigh_ready_to_submit()' functions
* may be called at session-creation time to override the default
* data-flow signal handlers as provided by the packet-stream source.
* 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-submit signals
*
* Must be called at constuction time only.
*/
void sigh_ready_to_submit(Genode::Signal_context_capability sigh) {
_sigh_ready_to_submit = sigh; }
/**
* Override default handler for server-side ack-avail signals
*
* Must be called at constuction time only.
*/
void sigh_ack_avail(Genode::Signal_context_capability sigh) {
_sigh_ack_avail = sigh; }
typename CHANNEL::Source *source() { return &_source; }
Genode::Capability<CHANNEL> cap() const { return _cap; }
/*******************
** RPC functions **
*******************/
Genode::Dataspace_capability dataspace() { return _source.dataspace(); }
void sigh_ready_to_ack(Genode::Signal_context_capability sigh) {
@ -71,9 +104,12 @@ namespace Packet_stream_rx {
void sigh_packet_avail(Genode::Signal_context_capability sigh) {
_source.register_sigh_packet_avail(sigh); }
typename CHANNEL::Source *source() { return &_source; }
virtual Genode::Signal_context_capability sigh_ready_to_submit() {
return _sigh_ready_to_submit; }
virtual Genode::Signal_context_capability sigh_ack_avail() {
return _sigh_ack_avail; }
Genode::Capability<CHANNEL> cap() const { return _cap; }
};
}