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This patch facilitates the batching of I/O operations in the VFS library by replacing the implicit wakeup of remote peer (via the traditional packet-stream interface like 'submit_packet') by explicit wakeup signalling. The wakeup signalling is triggered not before the VFS user settles down. E.g., for libc-based applications, this is the case if the libc goes idle, waiting for external I/O. In the case of a busy writer to a non-blocking file descriptor or socket (e.g., lighttpd), the remote peers are woken up once a write operation yields an out-count of 0. The deferring of wakeup signals is accommodated by the new 'Remote_io' mechanism (vfs/remote_io.h) that is designated to be used by all VFS plugins that interact with asynchronous Genode services for I/O. Issue #4697
56 lines
1.1 KiB
C++
56 lines
1.1 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 2018-04-02
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*/
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/*
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* Copyright (C) 2018-2019 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__ENV_H_
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#define _INCLUDE__VFS__ENV_H_
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#include <vfs/file_system.h>
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#include <vfs/remote_io.h>
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#include <base/allocator.h>
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#include <base/env.h>
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namespace Vfs { struct Env; }
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struct Vfs::Env : Interface
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{
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virtual Genode::Env &env() = 0;
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/**
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* Allocator for creating stuctures shared across open VFS handles
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*/
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virtual Genode::Allocator &alloc() = 0;
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/**
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* VFS root file system
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*/
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virtual File_system &root_dir() = 0;
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/**
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* Registry of deferred wakeups for plugins interacting with remote peers
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*/
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virtual Remote_io::Deferred_wakeups &deferred_wakeups() = 0;
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/**
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* Interface tailored for triggering and waiting for I/O
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*/
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struct Io : Interface, Genode::Noncopyable
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{
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virtual void progress() = 0;
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};
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virtual Io &io() = 0;
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};
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#endif /* _INCLUDE__VFS__ENV_H_ */
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