mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 06:07:59 +00:00
8a9974b6f9
This patch fosters the batching of network packets transferred by the lwIP stack over the NIC connection. It replaces the eager submission of the packet-stream's data-flow signals by explicit wakeup notifications. The commit also increases the NIC session's buffer size from 128 to 1024 packets. Issue #4697
141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/*
|
|
* \brief Hook functions for bootstrapping a libc-using Genode component
|
|
* \author Norman Feske
|
|
* \date 2016-12-23
|
|
*
|
|
* This interface is implemented by components that use both Genode's API and
|
|
* the libc. For such components, the libc provides the 'Component::construct'
|
|
* function that takes the precautions needed for letting the application use
|
|
* blocking I/O via POSIX functions like 'read' or 'select'. The libc's
|
|
* 'Component::construct' function finally passes control to the application by
|
|
* calling the application-provided 'Libc::Component::construct' function.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2016-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__LIBC__COMPONENT_H_
|
|
#define _INCLUDE__LIBC__COMPONENT_H_
|
|
|
|
#include <util/meta.h>
|
|
#include <base/env.h>
|
|
#include <base/stdint.h>
|
|
#include <util/xml_node.h>
|
|
|
|
namespace Libc { class Env; }
|
|
|
|
namespace Vfs { struct Env; }
|
|
|
|
/**
|
|
* Interface to be provided by the component implementation
|
|
*/
|
|
class Libc::Env : public Genode::Env
|
|
{
|
|
private:
|
|
|
|
virtual Genode::Xml_node _config_xml() const = 0;
|
|
|
|
public:
|
|
|
|
/**
|
|
* Component configuration
|
|
*/
|
|
template <typename FUNC>
|
|
void config(FUNC const &func) const {
|
|
func(_config_xml()); }
|
|
|
|
/**
|
|
* Virtual file system configured for this component
|
|
*/
|
|
virtual Vfs::Env &vfs_env() = 0;
|
|
|
|
/**
|
|
* Libc configuration for this component
|
|
*/
|
|
virtual Genode::Xml_node libc_config() = 0;
|
|
};
|
|
|
|
|
|
namespace Libc { namespace Component {
|
|
|
|
/**
|
|
* Return stack size of the component's initial entrypoint
|
|
*/
|
|
Genode::size_t stack_size();
|
|
|
|
/**
|
|
* Construct component
|
|
*
|
|
* \param env extended interface to the component's execution environment
|
|
*/
|
|
void construct(Libc::Env &env);
|
|
} }
|
|
|
|
|
|
namespace Libc {
|
|
|
|
class Application_code : Genode::Interface
|
|
{
|
|
protected:
|
|
|
|
/*
|
|
* Helper to distinguish void from non-void return type
|
|
*/
|
|
template <typename FUNC, typename RET>
|
|
void _execute(RET &ret_out, FUNC const &func) { ret_out = func(); }
|
|
|
|
template <typename FUNC>
|
|
void _execute(Genode::Meta::Empty &, FUNC const &func) { func(); }
|
|
|
|
public:
|
|
|
|
virtual void execute() = 0;
|
|
};
|
|
|
|
void execute_in_application_context(Application_code &);
|
|
|
|
/**
|
|
* Execute 'FUNC' lambda in the libc application context
|
|
*
|
|
* In order to invoke the libc's I/O functions (in particular 'select',
|
|
* 'read', 'write', or other functions like 'socket' that indirectly call
|
|
* them), the libc-calling application code must be executed under the
|
|
* supervision of the libc runtime. This is not the case for signal
|
|
* handlers or RPC functions that are executed in the context of the
|
|
* 'Genode::Entrypoint'. The 'with_libc' function allows such handlers to
|
|
* interact with the libc by deliberately subjecting the specified function
|
|
* ('func') to the libc runtime.
|
|
*/
|
|
template <typename FUNC>
|
|
auto with_libc(FUNC const &func)
|
|
-> typename Genode::Trait::Call_return
|
|
<typename Genode::Trait::Functor
|
|
<decltype(&FUNC::operator())>::Return_type>::Type
|
|
{
|
|
using Functor = Genode::Trait::Functor<decltype(&FUNC::operator())>;
|
|
using Return_type = typename Genode::Trait::Call_return<typename Functor::Return_type>::Type;
|
|
|
|
/*
|
|
* Implementation of the 'Application_code' interface that executes
|
|
* the code in the 'func' lambda.
|
|
*/
|
|
struct Application_code_func : Application_code
|
|
{
|
|
FUNC const &func;
|
|
Return_type retval { };
|
|
void execute() override { _execute(retval, func); }
|
|
Application_code_func(FUNC const &func) : func(func) { }
|
|
} application_code_func { func };
|
|
|
|
execute_in_application_context(application_code_func);
|
|
|
|
return application_code_func.retval;
|
|
}
|
|
}
|
|
|
|
#endif /* _INCLUDE__LIBC__COMPONENT_H_ */
|