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