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86 lines
3.9 KiB
C++
86 lines
3.9 KiB
C++
#ifndef RBIMPL_INTERN_SELECT_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_INTERN_SELECT_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Public APIs to provide ::rb_fd_select().
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* @note Functions and structs defined in this header file are not
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* necessarily ruby-specific. They don't need ::VALUE etc.
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*/
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#include "ruby/internal/config.h"
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h> /* for NFDBITS (BSD Net/2) */
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#endif
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#include "ruby/internal/dllexport.h"
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/* thread.c */
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#if defined(NFDBITS) && defined(HAVE_RB_FD_INIT)
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# include "ruby/internal/intern/select/largesize.h"
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#elif defined(_WIN32)
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# include "ruby/internal/intern/select/win32.h"
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# /** Does nothing (defined for compatibility). */
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# define rb_fd_resize(n, f) ((void)(f))
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#else
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# include "ruby/internal/intern/select/posix.h"
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# /** Does nothing (defined for compatibility). */
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# define rb_fd_resize(n, f) ((void)(f))
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#endif
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RBIMPL_SYMBOL_EXPORT_BEGIN()
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struct timeval;
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/**
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* Waits for multiple file descriptors at once. This is basically a wrapper of
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* system-provided select() with releasing GVL, to allow other Ruby threads run
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* in parallel.
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*
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* @param[in] nfds Max FD in everything passed, plus one.
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* @param[in,out] rfds Set of FDs to wait for reads.
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* @param[in,out] wfds Set of FDs to wait for writes.
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* @param[in,out] efds Set of FDs to wait for OOBs.
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* @param[in,out] timeout Max blocking duration.
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* @retval -1 Failed, errno set.
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* @retval 0 Timeout exceeded.
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* @retval otherwise Total number of file descriptors returned.
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* @post `rfds` contains readable FDs.
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* @post `wfds` contains writable FDs.
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* @post `efds` contains exceptional FDs.
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* @post `timeout` is the time left.
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* @note All pointers are allowed to be null pointers.
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*
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* Although backend threads can run in parallel of this function, touching a
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* file descriptor from multiple threads could be problematic. For instance
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* what happens when a thread closes a file descriptor that is selected by
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* someone else, vastly varies among operating systems. You would better avoid
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* touching an fd from more than one threads.
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*
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* @internal
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*
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* Although any file descriptors are possible here, it makes completely no
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* sense to pass a descriptor that is not `O_NONBLOCK`. If you want to know
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* the reason for this limitatuon in detail, you might find this thread super
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* interesting: https://lkml.org/lkml/2004/10/6/117
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*/
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int rb_thread_fd_select(int nfds, rb_fdset_t *rfds, rb_fdset_t *wfds, rb_fdset_t *efds, struct timeval *timeout);
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RBIMPL_SYMBOL_EXPORT_END()
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#endif /* RBIMPL_INTERN_SELECT_H */
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