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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
#ifndef RUBY3_INTERN_SELECT_WIN32_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY3_INTERN_SELECT_WIN32_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 `RUBY3` or `ruby3` 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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*/
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#include "ruby/3/dosish.h" /* for rb_w32_select */
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#include "ruby/3/attr/nonnull.h"
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#include "ruby/3/attr/pure.h"
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#include "ruby/3/attr/noalias.h"
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#include "ruby/3/dllexport.h"
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#include "ruby/assert.h"
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/**@cond INTERNAL_MACRO */
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#define rb_fd_zero rb_fd_zero
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#define rb_fd_clr rb_fd_clr
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#define rb_fd_isset rb_fd_isset
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#define rb_fd_copy rb_fd_copy
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#define rb_fd_dup rb_fd_dup
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#define rb_fd_ptr rb_fd_ptr
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#define rb_fd_max rb_fd_max
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/** @endcond */
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RUBY3_SYMBOL_EXPORT_BEGIN()
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struct timeval;
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typedef struct {
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int capa;
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fd_set *fdset;
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} rb_fdset_t;
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void rb_fd_init(rb_fdset_t *);
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void rb_fd_term(rb_fdset_t *);
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void rb_fd_set(int, rb_fdset_t *);
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void rb_w32_fd_copy(rb_fdset_t *, const fd_set *, int);
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void rb_w32_fd_dup(rb_fdset_t *dst, const rb_fdset_t *src);
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RUBY3_SYMBOL_EXPORT_END()
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RUBY3_ATTR_NONNULL(())
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RUBY3_ATTR_NOALIAS()
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static inline void
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rb_fd_zero(rb_fdset_t *f)
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{
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f->fdset->fd_count = 0;
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}
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RUBY3_ATTR_NONNULL(())
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static inline void
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rb_fd_clr(int n, rb_fdset_t *f)
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{
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rb_w32_fdclr(n, f->fdset);
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}
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RUBY3_ATTR_NONNULL(())
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static inline int
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rb_fd_isset(int n, rb_fdset_t *f)
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{
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return rb_w32_fdisset(n, f->fdset);
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}
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RUBY3_ATTR_NONNULL(())
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static inline void
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rb_fd_copy(rb_fdset_t *dst, const fd_set *src, int n)
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{
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rb_w32_fd_copy(dst, src, n);
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}
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RUBY3_ATTR_NONNULL(())
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static inline void
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rb_fd_dup(rb_fdset_t *dst, const rb_fdset_t *src)
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{
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rb_w32_fd_dup(dst, src);
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}
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static inline int
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rb_fd_select(int n, rb_fdset_t *rfds, rb_fdset_t *wfds, rb_fdset_t *efds, struct timeval *timeout)
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{
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return rb_w32_select(
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n,
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rfds ? rfds->fdset : NULL,
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wfds ? wfds->fdset : NULL,
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efds ? efds->fdset : NULL,
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timeout);
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}
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RUBY3_ATTR_NONNULL(())
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RUBY3_ATTR_PURE()
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/* :TODO: can this function be __attribute__((returns_nonnull)) or not? */
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static inline fd_set *
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rb_fd_ptr(const rb_fdset_t *f)
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{
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return f->fdset;
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}
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RUBY3_ATTR_NONNULL(())
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RUBY3_ATTR_PURE()
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static inline int
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rb_fd_max(const rb_fdset_t *f)
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{
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const fd_set *p = f->fdset;
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RUBY3_ASSERT_OR_ASSUME(p);
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return p->fd_count;
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}
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#endif /* RUBY3_INTERN_SELECT_WIN32_H */
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