// -*- C++ -*-
-// Copyright (C) 2007 Free Software Foundation, Inc.
+// Copyright (C) 2007-2024 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 2, or (at your option) any later
+// Foundation; either version 3, or (at your option) any later
// version.
// This library is distributed in the hope that it will be useful, but
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
-// You should have received a copy of the GNU General Public License
-// along with this library; see the file COPYING. If not, write to
-// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
-// MA 02111-1307, USA.
-
-// As a special exception, you may use this file as part of a free
-// software library without restriction. Specifically, if other files
-// instantiate templates or use macros or inline functions from this
-// file, or you compile this file and link it with other files to
-// produce an executable, this file does not by itself cause the
-// resulting executable to be covered by the GNU General Public
-// License. This exception does not however invalidate any other
-// reasons why the executable file might be covered by the GNU General
-// Public License.
+// 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/base.h
* @brief Sequential helper functions.
#ifndef _GLIBCXX_PARALLEL_BASE_H
#define _GLIBCXX_PARALLEL_BASE_H 1
+#include <bits/c++config.h>
+#include <bits/stl_function.h>
+#include <omp.h>
#include <parallel/features.h>
-#include <functional>
#include <parallel/basic_iterator.h>
#include <parallel/parallel.h>
-#include <cstdio>
+
+// Parallel mode namespaces.
+
+/**
+ * @namespace std::__parallel
+ * @brief GNU parallel code, replaces standard behavior with parallel behavior.
+ */
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+ namespace __parallel { }
+}
+
+/**
+ * @namespace __gnu_parallel
+ * @brief GNU parallel code for public use.
+ */
+namespace __gnu_parallel
+{
+ // Import all the parallel versions of components in namespace std.
+ using namespace std::__parallel;
+}
+
+/**
+ * @namespace __gnu_sequential
+ * @brief GNU sequential classes for public use.
+ */
+namespace __gnu_sequential
+{
+ // Import whatever is the serial version.
+#ifdef _GLIBCXX_PARALLEL
+ using namespace std::_GLIBCXX_STD_A;
+#else
+ using namespace std;
+#endif
+}
+
namespace __gnu_parallel
{
- // XXX remove std::duplicates from here if possible,
- // XXX but keep minimal dependencies.
+ // NB: Including this file cannot produce (unresolved) symbols from
+ // the OpenMP runtime unless the parallel mode is actually invoked
+ // and active, which imples that the OpenMP runtime is actually
+ // going to be linked in.
+ inline _ThreadIndex
+ __get_max_threads()
+ {
+ _ThreadIndex __i = omp_get_max_threads();
+ return __i > 1 ? __i : 1;
+ }
+
+
+ inline bool
+ __is_parallel(const _Parallelism __p) { return __p != sequential; }
- /** @brief Calculates the rounded-down logrithm of @c n for base 2.
- * @param n Argument.
- * @return Returns 0 for argument 0.
+
+ /** @brief Calculates the rounded-down logarithm of @c __n for base 2.
+ * @param __n Argument.
+ * @return Returns 0 for any argument <1.
*/
- template<typename Size>
- inline Size
- log2(Size n)
+ template<typename _Size>
+ inline _Size
+ __rd_log2(_Size __n)
{
- Size k;
- for (k = 0; n != 1; n >>= 1)
- ++k;
- return k;
+ _Size __k;
+ for (__k = 0; __n > 1; __n >>= 1)
+ ++__k;
+ return __k;
}
- /** @brief Encode two integers into one __gnu_parallel::lcas_t.
- * @param a First integer, to be encoded in the most-significant @c
- * lcas_t_bits/2 bits.
- * @param b Second integer, to be encoded in the least-significant
- * @c lcas_t_bits/2 bits.
- * @return __gnu_parallel::lcas_t value encoding @c a and @c b.
- * @see decode2
+ /** @brief Encode two integers into one gnu_parallel::_CASable.
+ * @param __a First integer, to be encoded in the most-significant @c
+ * _CASable_bits/2 bits.
+ * @param __b Second integer, to be encoded in the least-significant
+ * @c _CASable_bits/2 bits.
+ * @return value encoding @c __a and @c __b.
+ * @see __decode2
*/
- inline lcas_t
- encode2(int a, int b) //must all be non-negative, actually
+ inline _CASable
+ __encode2(int __a, int __b) //must all be non-negative, actually
{
- return (((lcas_t)a) << (lcas_t_bits / 2)) | (((lcas_t)b) << 0);
+ return (((_CASable)__a) << (_CASable_bits / 2)) | (((_CASable)__b) << 0);
}
- /** @brief Decode two integers from one __gnu_parallel::lcas_t.
- * @param x __gnu_parallel::lcas_t to decode integers from.
- * @param a First integer, to be decoded from the most-significant
- * @c lcas_t_bits/2 bits of @c x.
- * @param b Second integer, to be encoded in the least-significant
- * @c lcas_t_bits/2 bits of @c x.
- * @see encode2
+ /** @brief Decode two integers from one gnu_parallel::_CASable.
+ * @param __x __gnu_parallel::_CASable to decode integers from.
+ * @param __a First integer, to be decoded from the most-significant
+ * @c _CASable_bits/2 bits of @c __x.
+ * @param __b Second integer, to be encoded in the least-significant
+ * @c _CASable_bits/2 bits of @c __x.
+ * @see __encode2
*/
inline void
- decode2(lcas_t x, int& a, int& b)
+ __decode2(_CASable __x, int& __a, int& __b)
{
- a = (int)((x >> (lcas_t_bits / 2)) & lcas_t_mask);
- b = (int)((x >> 0 ) & lcas_t_mask);
+ __a = (int)((__x >> (_CASable_bits / 2)) & _CASable_mask);
+ __b = (int)((__x >> 0 ) & _CASable_mask);
}
+ //needed for parallel "numeric", even if "algorithm" not included
+
+ /** @brief Equivalent to std::min. */
+ template<typename _Tp>
+ inline const _Tp&
+ min(const _Tp& __a, const _Tp& __b)
+ { return (__a < __b) ? __a : __b; }
+
+ /** @brief Equivalent to std::max. */
+ template<typename _Tp>
+ inline const _Tp&
+ max(const _Tp& __a, const _Tp& __b)
+ { return (__a > __b) ? __a : __b; }
+
/** @brief Constructs predicate for equality from strict weak
* ordering predicate
*/
- // XXX comparator at the end, as per others
- template<typename Comparator, typename T1, typename T2>
- class equal_from_less : public std::binary_function<T1, T2, bool>
- {
- private:
- Comparator& comp;
-
- public:
- equal_from_less(Comparator& _comp) : comp(_comp) { }
-
- bool operator()(const T1& a, const T2& b)
+ template<typename _T1, typename _T2, typename _Compare>
+ class _EqualFromLess : public std::binary_function<_T1, _T2, bool>
{
- // FIXME: wrong in general (T1 != T2)
- return !comp(a, b) && !comp(b, a);
- }
- };
+ private:
+ _Compare& _M_comp;
+ public:
+ _EqualFromLess(_Compare& __comp) : _M_comp(__comp) { }
- /** @brief Similar to std::equal_to, but allows two different types. */
- template<typename T1, typename T2>
- struct equal_to : std::binary_function<T1, T2, bool>
- {
- bool operator()(const T1& t1, const T2& t2) const
- { return t1 == t2; }
- };
+ bool operator()(const _T1& __a, const _T2& __b)
+ { return !_M_comp(__a, __b) && !_M_comp(__b, __a); }
+ };
- /** @brief Similar to std::binder1st, but giving the argument types explicitly. */
+
+ /** @brief Similar to std::unary_negate,
+ * but giving the argument types explicitly. */
template<typename _Predicate, typename argument_type>
- class unary_negate
+ class __unary_negate
: public std::unary_function<argument_type, bool>
{
protected:
public:
explicit
- unary_negate(const _Predicate& __x) : _M_pred(__x) { }
+ __unary_negate(const _Predicate& __x) : _M_pred(__x) { }
bool
operator()(const argument_type& __x)
{ return !_M_pred(__x); }
};
- /** @brief Similar to std::binder1st, but giving the argument types explicitly. */
- template<typename _Operation, typename first_argument_type, typename second_argument_type, typename result_type>
- class binder1st
- : public std::unary_function<second_argument_type, result_type>
+ /** @brief Similar to std::binder1st,
+ * but giving the argument types explicitly. */
+ template<typename _Operation, typename _FirstArgumentType,
+ typename _SecondArgumentType, typename _ResultType>
+ class __binder1st
+ : public std::unary_function<_SecondArgumentType, _ResultType>
{
protected:
- _Operation op;
- first_argument_type value;
+ _Operation _M_op;
+ _FirstArgumentType _M_value;
public:
- binder1st(const _Operation& __x,
- const first_argument_type& __y)
- : op(__x), value(__y) { }
+ __binder1st(const _Operation& __x, const _FirstArgumentType& __y)
+ : _M_op(__x), _M_value(__y) { }
- result_type
- operator()(const second_argument_type& __x)
- { return op(value, __x); }
+ _ResultType
+ operator()(const _SecondArgumentType& __x)
+ { return _M_op(_M_value, __x); }
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 109. Missing binders for non-const sequence elements
- result_type
- operator()(second_argument_type& __x) const
- { return op(value, __x); }
+ _ResultType
+ operator()(_SecondArgumentType& __x) const
+ { return _M_op(_M_value, __x); }
};
- /** @brief Similar to std::binder2nd, but giving the argument types explicitly. */
- template<typename _Operation, typename first_argument_type, typename second_argument_type, typename result_type>
- class binder2nd
- : public std::unary_function<first_argument_type, result_type>
+ /**
+ * @brief Similar to std::binder2nd, but giving the argument types
+ * explicitly.
+ */
+ template<typename _Operation, typename _FirstArgumentType,
+ typename _SecondArgumentType, typename _ResultType>
+ class __binder2nd
+ : public std::unary_function<_FirstArgumentType, _ResultType>
{
protected:
- _Operation op;
- second_argument_type value;
+ _Operation _M_op;
+ _SecondArgumentType _M_value;
public:
- binder2nd(const _Operation& __x,
- const second_argument_type& __y)
- : op(__x), value(__y) { }
+ __binder2nd(const _Operation& __x, const _SecondArgumentType& __y)
+ : _M_op(__x), _M_value(__y) { }
- result_type
- operator()(const first_argument_type& __x) const
- { return op(__x, value); }
+ _ResultType
+ operator()(const _FirstArgumentType& __x) const
+ { return _M_op(__x, _M_value); }
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 109. Missing binders for non-const sequence elements
- result_type
- operator()(first_argument_type& __x)
- { return op(__x, value); }
+ _ResultType
+ operator()(_FirstArgumentType& __x)
+ { return _M_op(__x, _M_value); }
+ };
+
+ /** @brief Similar to std::equal_to, but allows two different types. */
+ template<typename _T1, typename _T2>
+ struct _EqualTo : std::binary_function<_T1, _T2, bool>
+ {
+ bool operator()(const _T1& __t1, const _T2& __t2) const
+ { return __t1 == __t2; }
};
/** @brief Similar to std::less, but allows two different types. */
- template<typename T1, typename T2>
- struct less : std::binary_function<T1, T2, bool>
- {
- bool operator()(const T1& t1, const T2& t2) const
- { return t1 < t2; }
- };
+ template<typename _T1, typename _T2>
+ struct _Less : std::binary_function<_T1, _T2, bool>
+ {
+ bool
+ operator()(const _T1& __t1, const _T2& __t2) const
+ { return __t1 < __t2; }
+ bool
+ operator()(const _T2& __t2, const _T1& __t1) const
+ { return __t2 < __t1; }
+ };
- template<typename T, typename _DifferenceTp>
- class pseudo_sequence;
+ // Partial specialization for one type. Same as std::less.
+ template<typename _Tp>
+ struct _Less<_Tp, _Tp>
+ : public std::less<_Tp> { };
- /** @brief Iterator associated with __gnu_parallel::pseudo_sequence.
- * If features the usual random-access iterator functionality.
- * @param T Sequence value type.
- * @param difference_type Sequence difference type.
- */
- template<typename T, typename _DifferenceTp>
- class pseudo_sequence_iterator
- {
- public:
- typedef _DifferenceTp difference_type;
+ /** @brief Similar to std::plus, but allows two different types. */
+ template<typename _Tp1, typename _Tp2, typename _Result
+ = __typeof__(*static_cast<_Tp1*>(0)
+ + *static_cast<_Tp2*>(0))>
+ struct _Plus : public std::binary_function<_Tp1, _Tp2, _Result>
+ {
+ _Result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x + __y; }
+ };
- private:
- typedef pseudo_sequence_iterator<T, _DifferenceTp> type;
+ // Partial specialization for one type. Same as std::plus.
+ template<typename _Tp>
+ struct _Plus<_Tp, _Tp, _Tp>
+ : public std::plus<_Tp> { };
- const T& val;
- difference_type pos;
+ /** @brief Similar to std::multiplies, but allows two different types. */
+ template<typename _Tp1, typename _Tp2, typename _Result
+ = __typeof__(*static_cast<_Tp1*>(0)
+ * *static_cast<_Tp2*>(0))>
+ struct _Multiplies : public std::binary_function<_Tp1, _Tp2, _Result>
+ {
+ _Result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x * __y; }
+ };
- public:
- pseudo_sequence_iterator(const T& val, difference_type pos)
- : val(val), pos(pos) { }
+ // Partial specialization for one type. Same as std::multiplies.
+ template<typename _Tp>
+ struct _Multiplies<_Tp, _Tp, _Tp>
+ : public std::multiplies<_Tp> { };
- // Pre-increment operator.
- type&
- operator++()
+ /** @brief _Iterator associated with __gnu_parallel::_PseudoSequence.
+ * If features the usual random-access iterator functionality.
+ * @param _Tp Sequence _M_value type.
+ * @param _DifferenceTp Sequence difference type.
+ */
+ template<typename _Tp, typename _DifferenceTp>
+ class _PseudoSequenceIterator
{
- ++pos;
- return *this;
- }
+ public:
+ typedef _DifferenceTp _DifferenceType;
+
+ _PseudoSequenceIterator(const _Tp& __val, _DifferenceType __pos)
+ : _M_val(__val), _M_pos(__pos) { }
+
+ // Pre-increment operator.
+ _PseudoSequenceIterator&
+ operator++()
+ {
+ ++_M_pos;
+ return *this;
+ }
- // Post-increment operator.
- const type
- operator++(int)
- { return type(pos++); }
+ // Post-increment operator.
+ _PseudoSequenceIterator
+ operator++(int)
+ { return _PseudoSequenceIterator(_M_pos++); }
- const T&
- operator*() const
- { return val; }
+ const _Tp&
+ operator*() const
+ { return _M_val; }
- const T&
- operator[](difference_type) const
- { return val; }
+ const _Tp&
+ operator[](_DifferenceType) const
+ { return _M_val; }
- bool
- operator==(const type& i2)
- { return pos == i2.pos; }
+ bool
+ operator==(const _PseudoSequenceIterator& __i2)
+ { return _M_pos == __i2._M_pos; }
- difference_type
- operator!=(const type& i2)
- { return pos != i2.pos; }
+ bool
+ operator!=(const _PseudoSequenceIterator& __i2)
+ { return _M_pos != __i2._M_pos; }
- difference_type
- operator-(const type& i2)
- { return pos - i2.pos; }
- };
+ _DifferenceType
+ operator-(const _PseudoSequenceIterator& __i2)
+ { return _M_pos - __i2._M_pos; }
+
+ private:
+ const _Tp& _M_val;
+ _DifferenceType _M_pos;
+ };
/** @brief Sequence that conceptually consists of multiple copies of
the same element.
- * The copies are not stored explicitly, of course.
- * @param T Sequence value type.
- * @param difference_type Sequence difference type.
- */
- template<typename T, typename _DifferenceTp>
- class pseudo_sequence
- {
- typedef pseudo_sequence<T, _DifferenceTp> type;
-
- public:
- typedef _DifferenceTp difference_type;
- typedef pseudo_sequence_iterator<T, uint64> iterator; //better case down to uint64, than up to _DifferenceTp
-
- /** @brief Constructor.
- * @param val Element of the sequence.
- * @param count Number of (virtual) copies.
- */
- pseudo_sequence(const T& val, difference_type count)
- : val(val), count(count) { }
-
- /** @brief Begin iterator. */
- iterator
- begin() const
- { return iterator(val, 0); }
-
- /** @brief End iterator. */
- iterator
- end() const
- { return iterator(val, count); }
-
- private:
- const T& val;
- difference_type count;
- };
-
- /** @brief Functor that does nothing */
- template<typename _ValueTp>
- class void_functor
- {
- inline void
- operator()(const _ValueTp& v) const { }
- };
+ * The copies are not stored explicitly, of course.
+ * @param _Tp Sequence _M_value type.
+ * @param _DifferenceTp Sequence difference type.
+ */
+ template<typename _Tp, typename _DifferenceTp>
+ class _PseudoSequence
+ {
+ public:
+ typedef _DifferenceTp _DifferenceType;
+
+ // Better cast down to uint64_t, than up to _DifferenceTp.
+ typedef _PseudoSequenceIterator<_Tp, uint64_t> iterator;
+
+ /** @brief Constructor.
+ * @param __val Element of the sequence.
+ * @param __count Number of (virtual) copies.
+ */
+ _PseudoSequence(const _Tp& __val, _DifferenceType __count)
+ : _M_val(__val), _M_count(__count) { }
+
+ /** @brief Begin iterator. */
+ iterator
+ begin() const
+ { return iterator(_M_val, 0); }
+
+ /** @brief End iterator. */
+ iterator
+ end() const
+ { return iterator(_M_val, _M_count); }
+
+ private:
+ const _Tp& _M_val;
+ _DifferenceType _M_count;
+ };
/** @brief Compute the median of three referenced elements,
- according to @c comp.
- * @param a First iterator.
- * @param b Second iterator.
- * @param c Third iterator.
- * @param comp Comparator.
- */
- template<typename RandomAccessIterator, typename Comparator>
- RandomAccessIterator
- median_of_three_iterators(RandomAccessIterator a, RandomAccessIterator b,
- RandomAccessIterator c, Comparator& comp)
- {
- if (comp(*a, *b))
- if (comp(*b, *c))
- return b;
- else
- if (comp(*a, *c))
- return c;
- else
- return a;
- else
- {
- // Just swap a and b.
- if (comp(*a, *c))
- return a;
+ according to @c __comp.
+ * @param __a First iterator.
+ * @param __b Second iterator.
+ * @param __c Third iterator.
+ * @param __comp Comparator.
+ */
+ template<typename _RAIter, typename _Compare>
+ _RAIter
+ __median_of_three_iterators(_RAIter __a, _RAIter __b,
+ _RAIter __c, _Compare __comp)
+ {
+ if (__comp(*__a, *__b))
+ if (__comp(*__b, *__c))
+ return __b;
else
- if (comp(*b, *c))
- return c;
+ if (__comp(*__a, *__c))
+ return __c;
else
- return b;
- }
- }
-
- // Avoid the use of assert, because we're trying to keep the <cassert>
- // include out of the mix. (Same as debug mode).
- inline void
- __replacement_assert(const char* __file, int __line,
- const char* __function, const char* __condition)
- {
- std::printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
- __function, __condition);
- __builtin_abort();
- }
-
-#define _GLIBCXX_PARALLEL_ASSERT(_Condition) \
- do \
- { \
- if (!(_Condition)) \
- __gnu_parallel::__replacement_assert(__FILE__, __LINE__, \
- __PRETTY_FUNCTION__, #_Condition); \
- } while (false)
-
-} //namespace __gnu_parallel
+ return __a;
+ else
+ {
+ // Just swap __a and __b.
+ if (__comp(*__a, *__c))
+ return __a;
+ else
+ if (__comp(*__b, *__c))
+ return __c;
+ else
+ return __b;
+ }
+ }
+#if _GLIBCXX_PARALLEL_ASSERTIONS && defined(__glibcxx_assert_impl)
+# define _GLIBCXX_PARALLEL_ASSERT(_Condition) \
+ do { __glibcxx_assert_impl(_Condition); } while (false)
+#else
+# define _GLIBCXX_PARALLEL_ASSERT(_Condition) do { } while (false)
#endif
+} //namespace __gnu_parallel
+
+#endif /* _GLIBCXX_PARALLEL_BASE_H */
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