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jeremybenn |
// -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file parallel/compatibility.h
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* @brief Compatibility layer, mostly concerned with atomic operations.
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* This file is a GNU parallel extension to the Standard C++ Library.
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*/
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// Written by Felix Putze.
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#ifndef _GLIBCXX_PARALLEL_COMPATIBILITY_H
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#define _GLIBCXX_PARALLEL_COMPATIBILITY_H 1
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#include <parallel/types.h>
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#include <parallel/base.h>
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#if defined(__SUNPRO_CC) && defined(__sparc)
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#include <sys/atomic.h>
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#endif
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#if !defined(_WIN32) || defined (__CYGWIN__)
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#include <sched.h>
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#endif
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#if defined(_MSC_VER)
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#include <Windows.h>
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#include <intrin.h>
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#undef max
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#undef min
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#endif
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#ifdef __MINGW32__
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// Including <windows.h> will drag in all the windows32 names. Since
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// that can cause user code portability problems, we just declare the
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// one needed function here.
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extern "C"
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__attribute((dllimport)) void __attribute__((stdcall)) Sleep (unsigned long);
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#endif
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namespace __gnu_parallel
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{
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#if defined(__ICC)
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template<typename _MustBeInt = int>
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int32_t __faa32(int32_t* __x, int32_t __inc)
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{
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asm volatile("lock xadd %0,%1"
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: "=__r" (__inc), "=__m" (*__x)
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: "0" (__inc)
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: "memory");
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return __inc;
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}
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#if defined(__x86_64)
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template<typename _MustBeInt = int>
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int64_t __faa64(int64_t* __x, int64_t __inc)
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{
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asm volatile("lock xadd %0,%1"
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: "=__r" (__inc), "=__m" (*__x)
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: "0" (__inc)
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: "memory");
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return __inc;
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}
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#endif
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#endif
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// atomic functions only work on integers
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/** @brief Add a value to a variable, atomically.
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*
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* Implementation is heavily platform-dependent.
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* @param __ptr Pointer to a 32-bit signed integer.
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* @param __addend Value to add.
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*/
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inline int32_t
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__fetch_and_add_32(volatile int32_t* __ptr, int32_t __addend)
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{
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#if defined(__ICC) //x86 version
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return _InterlockedExchangeAdd((void*)__ptr, __addend);
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#elif defined(__ECC) //IA-64 version
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return _InterlockedExchangeAdd((void*)__ptr, __addend);
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#elif defined(__ICL) || defined(_MSC_VER)
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return _InterlockedExchangeAdd(reinterpret_cast<volatile long*>(__ptr),
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__addend);
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#elif defined(__GNUC__)
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return __sync_fetch_and_add(__ptr, __addend);
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#elif defined(__SUNPRO_CC) && defined(__sparc)
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volatile int32_t __before, __after;
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do
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{
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__before = *__ptr;
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__after = __before + __addend;
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} while (atomic_cas_32((volatile unsigned int*)__ptr, __before,
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__after) != __before);
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return __before;
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#else //fallback, slow
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#pragma message("slow __fetch_and_add_32")
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int32_t __res;
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#pragma omp critical
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{
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__res = *__ptr;
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*(__ptr) += __addend;
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}
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return __res;
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#endif
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}
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/** @brief Add a value to a variable, atomically.
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*
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* Implementation is heavily platform-dependent.
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* @param __ptr Pointer to a 64-bit signed integer.
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* @param __addend Value to add.
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*/
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inline int64_t
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__fetch_and_add_64(volatile int64_t* __ptr, int64_t __addend)
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{
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#if defined(__ICC) && defined(__x86_64) //x86 version
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return __faa64<int>((int64_t*)__ptr, __addend);
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#elif defined(__ECC) //IA-64 version
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return _InterlockedExchangeAdd64((void*)__ptr, __addend);
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#elif defined(__ICL) || defined(_MSC_VER)
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#ifndef _WIN64
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_GLIBCXX_PARALLEL_ASSERT(false); //not available in this case
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return 0;
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#else
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return _InterlockedExchangeAdd64(__ptr, __addend);
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#endif
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#elif defined(__GNUC__) && defined(__x86_64)
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return __sync_fetch_and_add(__ptr, __addend);
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#elif defined(__GNUC__) && defined(__i386) && \
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(defined(__i686) || defined(__pentium4) || defined(__athlon) \
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|| defined(__k8) || defined(__core2))
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return __sync_fetch_and_add(__ptr, __addend);
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#elif defined(__SUNPRO_CC) && defined(__sparc)
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volatile int64_t __before, __after;
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do
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{
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__before = *__ptr;
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__after = __before + __addend;
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} while (atomic_cas_64((volatile unsigned long long*)__ptr, __before,
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__after) != __before);
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return __before;
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#else //fallback, slow
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#if defined(__GNUC__) && defined(__i386)
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// XXX doesn'__t work with -march=native
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//#warning "please compile with -march=i686 or better"
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#endif
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#pragma message("slow __fetch_and_add_64")
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int64_t __res;
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#pragma omp critical
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{
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__res = *__ptr;
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*(__ptr) += __addend;
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}
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return __res;
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#endif
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}
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/** @brief Add a value to a variable, atomically.
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*
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* Implementation is heavily platform-dependent.
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* @param __ptr Pointer to a signed integer.
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* @param __addend Value to add.
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*/
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template<typename _Tp>
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inline _Tp
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__fetch_and_add(volatile _Tp* __ptr, _Tp __addend)
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{
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if (sizeof(_Tp) == sizeof(int32_t))
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return
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(_Tp)__fetch_and_add_32((volatile int32_t*) __ptr, (int32_t)__addend);
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else if (sizeof(_Tp) == sizeof(int64_t))
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return
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(_Tp)__fetch_and_add_64((volatile int64_t*) __ptr, (int64_t)__addend);
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else
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_GLIBCXX_PARALLEL_ASSERT(false);
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}
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#if defined(__ICC)
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template<typename _MustBeInt = int>
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inline int32_t
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__cas32(volatile int32_t* __ptr, int32_t __old, int32_t __nw)
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{
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int32_t __before;
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__asm__ __volatile__("lock; cmpxchgl %1,%2"
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: "=a"(__before)
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: "q"(__nw), "__m"(*(volatile long long*)(__ptr)),
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"0"(__old)
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: "memory");
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return __before;
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}
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#if defined(__x86_64)
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template<typename _MustBeInt = int>
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inline int64_t
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__cas64(volatile int64_t *__ptr, int64_t __old, int64_t __nw)
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{
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int64_t __before;
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__asm__ __volatile__("lock; cmpxchgq %1,%2"
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: "=a"(__before)
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: "q"(__nw), "__m"(*(volatile long long*)(__ptr)),
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"0"(__old)
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: "memory");
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return __before;
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}
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#endif
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#endif
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/** @brief Compare @c *__ptr and @c __comparand. If equal, let @c
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* *__ptr=__replacement and return @c true, return @c false otherwise.
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*
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* Implementation is heavily platform-dependent.
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* @param __ptr Pointer to 32-bit signed integer.
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* @param __comparand Compare value.
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* @param __replacement Replacement value.
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*/
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inline bool
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__compare_and_swap_32(volatile int32_t* __ptr, int32_t __comparand,
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int32_t __replacement)
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{
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#if defined(__ICC) //x86 version
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return _InterlockedCompareExchange((void*)__ptr, __replacement,
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__comparand) == __comparand;
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#elif defined(__ECC) //IA-64 version
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return _InterlockedCompareExchange((void*)__ptr, __replacement,
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__comparand) == __comparand;
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#elif defined(__ICL) || defined(_MSC_VER)
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return _InterlockedCompareExchange(
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reinterpret_cast<volatile long*>(__ptr),
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__replacement, __comparand)
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== __comparand;
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#elif defined(__GNUC__)
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return __sync_bool_compare_and_swap(__ptr, __comparand, __replacement);
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#elif defined(__SUNPRO_CC) && defined(__sparc)
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return atomic_cas_32((volatile unsigned int*)__ptr, __comparand,
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__replacement) == __comparand;
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#else
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#pragma message("slow __compare_and_swap_32")
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bool __res = false;
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#pragma omp critical
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{
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if (*__ptr == __comparand)
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{
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*__ptr = __replacement;
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__res = true;
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}
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}
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return __res;
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#endif
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}
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/** @brief Compare @c *__ptr and @c __comparand. If equal, let @c
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* *__ptr=__replacement and return @c true, return @c false otherwise.
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*
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* Implementation is heavily platform-dependent.
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* @param __ptr Pointer to 64-bit signed integer.
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* @param __comparand Compare value.
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* @param __replacement Replacement value.
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*/
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inline bool
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__compare_and_swap_64(volatile int64_t* __ptr, int64_t __comparand,
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int64_t __replacement)
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{
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#if defined(__ICC) && defined(__x86_64) //x86 version
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return __cas64<int>(__ptr, __comparand, __replacement) == __comparand;
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#elif defined(__ECC) //IA-64 version
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return _InterlockedCompareExchange64((void*)__ptr, __replacement,
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__comparand) == __comparand;
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#elif defined(__ICL) || defined(_MSC_VER)
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#ifndef _WIN64
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_GLIBCXX_PARALLEL_ASSERT(false); //not available in this case
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return 0;
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#else
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return _InterlockedCompareExchange64(__ptr, __replacement,
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__comparand) == __comparand;
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#endif
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299 |
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#elif defined(__GNUC__) && defined(__x86_64)
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return __sync_bool_compare_and_swap(__ptr, __comparand, __replacement);
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#elif defined(__GNUC__) && defined(__i386) && \
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|
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(defined(__i686) || defined(__pentium4) || defined(__athlon) \
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304 |
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|| defined(__k8) || defined(__core2))
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return __sync_bool_compare_and_swap(__ptr, __comparand, __replacement);
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#elif defined(__SUNPRO_CC) && defined(__sparc)
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return atomic_cas_64((volatile unsigned long long*)__ptr,
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__comparand, __replacement) == __comparand;
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#else
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310 |
|
|
#if defined(__GNUC__) && defined(__i386)
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311 |
|
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// XXX -march=native
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312 |
|
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//#warning "please compile with -march=i686 or better"
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#endif
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314 |
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#pragma message("slow __compare_and_swap_64")
|
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|
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bool __res = false;
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#pragma omp critical
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317 |
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{
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if (*__ptr == __comparand)
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{
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*__ptr = __replacement;
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__res = true;
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}
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}
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return __res;
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#endif
|
326 |
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}
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328 |
|
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/** @brief Compare @c *__ptr and @c __comparand. If equal, let @c
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329 |
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* *__ptr=__replacement and return @c true, return @c false otherwise.
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330 |
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*
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331 |
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* Implementation is heavily platform-dependent.
|
332 |
|
|
* @param __ptr Pointer to signed integer.
|
333 |
|
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* @param __comparand Compare value.
|
334 |
|
|
* @param __replacement Replacement value. */
|
335 |
|
|
template<typename _Tp>
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336 |
|
|
inline bool
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337 |
|
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__compare_and_swap(volatile _Tp* __ptr, _Tp __comparand, _Tp __replacement)
|
338 |
|
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{
|
339 |
|
|
if (sizeof(_Tp) == sizeof(int32_t))
|
340 |
|
|
return __compare_and_swap_32((volatile int32_t*) __ptr,
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341 |
|
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(int32_t)__comparand,
|
342 |
|
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(int32_t)__replacement);
|
343 |
|
|
else if (sizeof(_Tp) == sizeof(int64_t))
|
344 |
|
|
return __compare_and_swap_64((volatile int64_t*) __ptr,
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345 |
|
|
(int64_t)__comparand,
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346 |
|
|
(int64_t)__replacement);
|
347 |
|
|
else
|
348 |
|
|
_GLIBCXX_PARALLEL_ASSERT(false);
|
349 |
|
|
}
|
350 |
|
|
|
351 |
|
|
/** @brief Yield the control to another thread, without waiting for
|
352 |
|
|
the end to the time slice. */
|
353 |
|
|
inline void
|
354 |
|
|
__yield()
|
355 |
|
|
{
|
356 |
|
|
#if defined (_WIN32) && !defined (__CYGWIN__)
|
357 |
|
|
Sleep(0);
|
358 |
|
|
#else
|
359 |
|
|
sched_yield();
|
360 |
|
|
#endif
|
361 |
|
|
}
|
362 |
|
|
} // end namespace
|
363 |
|
|
|
364 |
|
|
#endif /* _GLIBCXX_PARALLEL_COMPATIBILITY_H */
|