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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 |
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This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.