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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
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#ifndef RUBY_THREAD_NATIVE_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_THREAD_NATIVE_H 1
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/**
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* @file
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* @author $Author: ko1 $
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* @date Wed May 14 19:37:31 2014
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* @copyright Copyright (C) 2014 Yukihiro Matsumoto
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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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*/
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/*
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* This file contains wrapper APIs for native thread primitives
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* which Ruby interpreter uses.
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*
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* Now, we only support pthread and Windows threads.
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*
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* If you want to use Ruby's Mutex and so on to synchronize Ruby Threads,
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* please use Mutex directly.
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*/
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#if defined(_WIN32)
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#include <windows.h>
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typedef HANDLE rb_nativethread_id_t;
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typedef union rb_thread_lock_union {
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HANDLE mutex;
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CRITICAL_SECTION crit;
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} rb_nativethread_lock_t;
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#elif defined(HAVE_PTHREAD_H)
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#include <pthread.h>
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typedef pthread_t rb_nativethread_id_t;
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typedef pthread_mutex_t rb_nativethread_lock_t;
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#else
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#error "unsupported thread type"
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#endif
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RUBY_SYMBOL_EXPORT_BEGIN
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rb_nativethread_id_t rb_nativethread_self();
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void rb_nativethread_lock_initialize(rb_nativethread_lock_t *lock);
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void rb_nativethread_lock_destroy(rb_nativethread_lock_t *lock);
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void rb_nativethread_lock_lock(rb_nativethread_lock_t *lock);
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void rb_nativethread_lock_unlock(rb_nativethread_lock_t *lock);
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RUBY_SYMBOL_EXPORT_END
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#endif
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