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+// -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file parallel/compatibility.h
+ * @brief Compatibility layer, mostly concerned with atomic operations.
+ * This file is a GNU parallel extension to the Standard C++ Library.
+ */
+
+// Written by Felix Putze.
+
+#ifndef _GLIBCXX_PARALLEL_COMPATIBILITY_H
+#define _GLIBCXX_PARALLEL_COMPATIBILITY_H 1
+
+#include <parallel/types.h>
+#include <parallel/base.h>
+
+#if defined(__SUNPRO_CC) && defined(__sparc)
+#include <sys/atomic.h>
+#endif
+
+#if !defined(_WIN32) || defined (__CYGWIN__)
+#include <sched.h>
+#endif
+
+#if defined(_MSC_VER)
+#include <Windows.h>
+#include <intrin.h>
+#undef max
+#undef min
+#endif
+
+#ifdef __MINGW32__
+// Including <windows.h> will drag in all the windows32 names. Since
+// that can cause user code portability problems, we just declare the
+// one needed function here.
+extern "C"
+__attribute((dllimport)) void __attribute__((stdcall)) Sleep (unsigned long);
+#endif
+
+namespace __gnu_parallel
+{
+#if defined(__ICC)
+ template<typename must_be_int = int>
+ int32 faa32(int32* x, int32 inc)
+ {
+ asm volatile("lock xadd %0,%1"
+ : "=r" (inc), "=m" (*x)
+ : "0" (inc)
+ : "memory");
+ return inc;
+ }
+#if defined(__x86_64)
+ template<typename must_be_int = int>
+ int64 faa64(int64* x, int64 inc)
+ {
+ asm volatile("lock xadd %0,%1"
+ : "=r" (inc), "=m" (*x)
+ : "0" (inc)
+ : "memory");
+ return inc;
+ }
+#endif
+#endif
+
+ // atomic functions only work on integers
+
+ /** @brief Add a value to a variable, atomically.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to a 32-bit signed integer.
+ * @param addend Value to add.
+ */
+ inline int32
+ fetch_and_add_32(volatile int32* ptr, int32 addend)
+ {
+#if defined(__ICC) //x86 version
+ return _InterlockedExchangeAdd((void*)ptr, addend);
+#elif defined(__ECC) //IA-64 version
+ return _InterlockedExchangeAdd((void*)ptr, addend);
+#elif defined(__ICL) || defined(_MSC_VER)
+ return _InterlockedExchangeAdd(reinterpret_cast<volatile long*>(ptr),
+ addend);
+#elif defined(__GNUC__)
+ return __sync_fetch_and_add(ptr, addend);
+#elif defined(__SUNPRO_CC) && defined(__sparc)
+ volatile int32 before, after;
+ do
+ {
+ before = *ptr;
+ after = before + addend;
+ } while (atomic_cas_32((volatile unsigned int*)ptr, before,
+ after) != before);
+ return before;
+#else //fallback, slow
+#pragma message("slow fetch_and_add_32")
+ int32 res;
+#pragma omp critical
+ {
+ res = *ptr;
+ *(ptr) += addend;
+ }
+ return res;
+#endif
+ }
+
+ /** @brief Add a value to a variable, atomically.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to a 64-bit signed integer.
+ * @param addend Value to add.
+ */
+ inline int64
+ fetch_and_add_64(volatile int64* ptr, int64 addend)
+ {
+#if defined(__ICC) && defined(__x86_64) //x86 version
+ return faa64<int>((int64*)ptr, addend);
+#elif defined(__ECC) //IA-64 version
+ return _InterlockedExchangeAdd64((void*)ptr, addend);
+#elif defined(__ICL) || defined(_MSC_VER)
+#ifndef _WIN64
+ _GLIBCXX_PARALLEL_ASSERT(false); //not available in this case
+ return 0;
+#else
+ return _InterlockedExchangeAdd64(ptr, addend);
+#endif
+#elif defined(__GNUC__) && defined(__x86_64)
+ return __sync_fetch_and_add(ptr, addend);
+#elif defined(__GNUC__) && defined(__i386) && \
+ (defined(__i686) || defined(__pentium4) || defined(__athlon))
+ return __sync_fetch_and_add(ptr, addend);
+#elif defined(__SUNPRO_CC) && defined(__sparc)
+ volatile int64 before, after;
+ do
+ {
+ before = *ptr;
+ after = before + addend;
+ } while (atomic_cas_64((volatile unsigned long long*)ptr, before,
+ after) != before);
+ return before;
+#else //fallback, slow
+#if defined(__GNUC__) && defined(__i386)
+ // XXX doesn't work with -march=native
+ //#warning "please compile with -march=i686 or better"
+#endif
+#pragma message("slow fetch_and_add_64")
+ int64 res;
+#pragma omp critical
+ {
+ res = *ptr;
+ *(ptr) += addend;
+ }
+ return res;
+#endif
+ }
+
+ /** @brief Add a value to a variable, atomically.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to a signed integer.
+ * @param addend Value to add.
+ */
+ template<typename T>
+ inline T
+ fetch_and_add(volatile T* ptr, T addend)
+ {
+ if (sizeof(T) == sizeof(int32))
+ return (T)fetch_and_add_32((volatile int32*) ptr, (int32)addend);
+ else if (sizeof(T) == sizeof(int64))
+ return (T)fetch_and_add_64((volatile int64*) ptr, (int64)addend);
+ else
+ _GLIBCXX_PARALLEL_ASSERT(false);
+ }
+
+
+#if defined(__ICC)
+
+ template<typename must_be_int = int>
+ inline int32
+ cas32(volatile int32* ptr, int32 old, int32 nw)
+ {
+ int32 before;
+ __asm__ __volatile__("lock; cmpxchgl %1,%2"
+ : "=a"(before)
+ : "q"(nw), "m"(*(volatile long long*)(ptr)), "0"(old)
+ : "memory");
+ return before;
+ }
+
+#if defined(__x86_64)
+ template<typename must_be_int = int>
+ inline int64
+ cas64(volatile int64 *ptr, int64 old, int64 nw)
+ {
+ int64 before;
+ __asm__ __volatile__("lock; cmpxchgq %1,%2"
+ : "=a"(before)
+ : "q"(nw), "m"(*(volatile long long*)(ptr)), "0"(old)
+ : "memory");
+ return before;
+ }
+#endif
+
+#endif
+
+ /** @brief Compare @c *ptr and @c comparand. If equal, let @c
+ * *ptr=replacement and return @c true, return @c false otherwise.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to 32-bit signed integer.
+ * @param comparand Compare value.
+ * @param replacement Replacement value.
+ */
+ inline bool
+ compare_and_swap_32(volatile int32* ptr, int32 comparand, int32 replacement)
+ {
+#if defined(__ICC) //x86 version
+ return _InterlockedCompareExchange((void*)ptr, replacement,
+ comparand) == comparand;
+#elif defined(__ECC) //IA-64 version
+ return _InterlockedCompareExchange((void*)ptr, replacement,
+ comparand) == comparand;
+#elif defined(__ICL) || defined(_MSC_VER)
+ return _InterlockedCompareExchange(reinterpret_cast<volatile long*>(ptr),
+ replacement, comparand) == comparand;
+#elif defined(__GNUC__)
+ return __sync_bool_compare_and_swap(ptr, comparand, replacement);
+#elif defined(__SUNPRO_CC) && defined(__sparc)
+ return atomic_cas_32((volatile unsigned int*)ptr, comparand,
+ replacement) == comparand;
+#else
+#pragma message("slow compare_and_swap_32")
+ bool res = false;
+#pragma omp critical
+ {
+ if (*ptr == comparand)
+ {
+ *ptr = replacement;
+ res = true;
+ }
+ }
+ return res;
+#endif
+ }
+
+ /** @brief Compare @c *ptr and @c comparand. If equal, let @c
+ * *ptr=replacement and return @c true, return @c false otherwise.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to 64-bit signed integer.
+ * @param comparand Compare value.
+ * @param replacement Replacement value.
+ */
+ inline bool
+ compare_and_swap_64(volatile int64* ptr, int64 comparand, int64 replacement)
+ {
+#if defined(__ICC) && defined(__x86_64) //x86 version
+ return cas64<int>(ptr, comparand, replacement) == comparand;
+#elif defined(__ECC) //IA-64 version
+ return _InterlockedCompareExchange64((void*)ptr, replacement,
+ comparand) == comparand;
+#elif defined(__ICL) || defined(_MSC_VER)
+#ifndef _WIN64
+ _GLIBCXX_PARALLEL_ASSERT(false); //not available in this case
+ return 0;
+#else
+ return _InterlockedCompareExchange64(ptr, replacement,
+ comparand) == comparand;
+#endif
+
+#elif defined(__GNUC__) && defined(__x86_64)
+ return __sync_bool_compare_and_swap(ptr, comparand, replacement);
+#elif defined(__GNUC__) && defined(__i386) && \
+ (defined(__i686) || defined(__pentium4) || defined(__athlon))
+ return __sync_bool_compare_and_swap(ptr, comparand, replacement);
+#elif defined(__SUNPRO_CC) && defined(__sparc)
+ return atomic_cas_64((volatile unsigned long long*)ptr,
+ comparand, replacement) == comparand;
+#else
+#if defined(__GNUC__) && defined(__i386)
+ // XXX -march=native
+ //#warning "please compile with -march=i686 or better"
+#endif
+#pragma message("slow compare_and_swap_64")
+ bool res = false;
+#pragma omp critical
+ {
+ if (*ptr == comparand)
+ {
+ *ptr = replacement;
+ res = true;
+ }
+ }
+ return res;
+#endif
+ }
+
+ /** @brief Compare @c *ptr and @c comparand. If equal, let @c
+ * *ptr=replacement and return @c true, return @c false otherwise.
+ *
+ * Implementation is heavily platform-dependent.
+ * @param ptr Pointer to signed integer.
+ * @param comparand Compare value.
+ * @param replacement Replacement value. */
+ template<typename T>
+ inline bool
+ compare_and_swap(volatile T* ptr, T comparand, T replacement)
+ {
+ if (sizeof(T) == sizeof(int32))
+ return compare_and_swap_32((volatile int32*) ptr, (int32)comparand, (int32)replacement);
+ else if (sizeof(T) == sizeof(int64))
+ return compare_and_swap_64((volatile int64*) ptr, (int64)comparand, (int64)replacement);
+ else
+ _GLIBCXX_PARALLEL_ASSERT(false);
+ }
+
+ /** @brief Yield the control to another thread, without waiting for
+ the end to the time slice. */
+ inline void
+ yield()
+ {
+#if defined (_WIN32) && !defined (__CYGWIN__)
+ Sleep(0);
+#else
+ sched_yield();
+#endif
+ }
+} // end namespace
+
+#endif /* _GLIBCXX_PARALLEL_COMPATIBILITY_H */
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