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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
74 lines
2 KiB
C
74 lines
2 KiB
C
#ifndef RUBY_THREAD_PTHREAD_H
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#define RUBY_THREAD_PTHREAD_H
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/**********************************************************************
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thread_pthread.h -
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$Author$
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Copyright (C) 2004-2007 Koichi Sasada
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**********************************************************************/
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#ifdef HAVE_PTHREAD_NP_H
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#include <pthread_np.h>
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#endif
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#define RB_NATIVETHREAD_LOCK_INIT PTHREAD_MUTEX_INITIALIZER
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#define RB_NATIVETHREAD_COND_INIT PTHREAD_COND_INITIALIZER
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typedef pthread_cond_t rb_nativethread_cond_t;
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typedef struct native_thread_data_struct {
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union {
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struct list_node ubf;
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struct list_node gvl;
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} node;
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#if defined(__GLIBC__) || defined(__FreeBSD__)
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union
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#else
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/*
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* assume the platform condvars are badly implemented and have a
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* "memory" of which mutex they're associated with
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*/
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struct
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#endif
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{
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rb_nativethread_cond_t intr; /* th->interrupt_lock */
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rb_nativethread_cond_t gvlq; /* vm->gvl.lock */
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} cond;
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} native_thread_data_t;
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#undef except
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#undef try
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#undef leave
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#undef finally
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typedef struct rb_global_vm_lock_struct {
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/* fast path */
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const struct rb_thread_struct *owner;
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rb_nativethread_lock_t lock; /* AKA vm->gvl.lock */
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/*
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* slow path, protected by vm->gvl.lock
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* - @waitq - FIFO queue of threads waiting for GVL
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* - @timer - it handles timeslices for @owner. It is any one thread
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* in @waitq, there is no @timer if @waitq is empty, but always
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* a @timer if @waitq has entries
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* - @timer_err tracks timeslice limit, the timeslice only resets
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* when pthread_cond_timedwait returns ETIMEDOUT, so frequent
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* switching between contended/uncontended GVL won't reset the
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* timer.
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*/
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struct list_head waitq; /* <=> native_thread_data_t.node.ubf */
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const struct rb_thread_struct *timer;
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int timer_err;
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/* yield */
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rb_nativethread_cond_t switch_cond;
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rb_nativethread_cond_t switch_wait_cond;
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int need_yield;
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int wait_yield;
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} rb_global_vm_lock_t;
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#endif /* RUBY_THREAD_PTHREAD_H */
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