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ff2176a586
By adding a 'write_ready' interface following the lines of the existing 'read_ready', VFS plugins become able to propagate the (de-)saturation of I/O buffers to the VFS user. This information is important when using a non-blocking file descriptor for writing into a TCP socket. Once the application observes EAGAIN, it expects a subsequent 'select' call to return as soon as new I/O buffer space becomes available. Before this patch, the select call would always return under this condition, causing an unnecessarily busy write loop. Issue #4697
92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
/*
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* \brief Cross-plugin VFS environment
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* \author Emery Hemingway
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* \author Norman Feske
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* \date 2018-04-04
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*/
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/*
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* Copyright (C) 2018 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__VFS__SIMPLE_ENV_H_
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#define _INCLUDE__VFS__SIMPLE_ENV_H_
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#include <vfs/file_system_factory.h>
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#include <vfs/dir_file_system.h>
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#include <vfs/env.h>
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namespace Vfs { struct Simple_env; }
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class Vfs::Simple_env : public Vfs::Env, private Vfs::Env::Io, private Vfs::Env::User
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{
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private:
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Genode::Env &_env;
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Genode::Allocator &_alloc;
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Vfs::Env::User &_user;
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using Deferred_wakeups = Remote_io::Deferred_wakeups;
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Deferred_wakeups _deferred_wakeups { };
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Global_file_system_factory _fs_factory { _alloc };
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Dir_file_system _root_dir;
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public:
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Simple_env(Genode::Env &env,
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Genode::Allocator &alloc,
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Genode::Xml_node config,
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Vfs::Env::User &user)
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:
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_env(env), _alloc(alloc), _user(user), _root_dir(*this, config, _fs_factory)
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{ }
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Simple_env(Genode::Env &env, Genode::Allocator &alloc, Genode::Xml_node config)
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:
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Simple_env(env, alloc, config, *this)
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{ }
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void apply_config(Genode::Xml_node const &config)
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{
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_root_dir.apply_config(config);
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}
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Genode::Env &env() override { return _env; }
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Genode::Allocator &alloc() override { return _alloc; }
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Vfs::File_system &root_dir() override { return _root_dir; }
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Deferred_wakeups &deferred_wakeups() override { return _deferred_wakeups; }
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Vfs::Env::Io &io() override { return *this; }
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Vfs::Env::User &user() override { return _user; }
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/**
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* Vfs::Env::Io interface
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*/
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void commit() override { _deferred_wakeups.trigger(); }
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/**
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* Vfs::Env::Io interface
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*/
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void commit_and_wait() override
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{
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_deferred_wakeups.trigger();
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_env.ep().wait_and_dispatch_one_io_signal();
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}
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/**
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* Vfs::Env::User interface
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*
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* Fallback implementation used if no 'user' is specified at
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* construction time.
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*/
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void wakeup_vfs_user() override { };
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};
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#endif /* _INCLUDE__VFS__SIMPLE_ENV_H_ */
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