head	1.1;
branch	1.1.1;
access;
symbols
	netbsd-11-0-RC5:1.1.1.1
	netbsd-11-0-RC4:1.1.1.1
	netbsd-11-0-RC3:1.1.1.1
	netbsd-11-0-RC2:1.1.1.1
	netbsd-11-0-RC1:1.1.1.1
	gcc-14-3-0:1.1.1.2
	perseant-exfatfs-base-20250801:1.1.1.1
	netbsd-11:1.1.1.1.0.4
	netbsd-11-base:1.1.1.1
	gcc-12-5-0:1.1.1.1
	perseant-exfatfs-base-20240630:1.1.1.1
	gcc-12-4-0:1.1.1.1
	perseant-exfatfs:1.1.1.1.0.2
	perseant-exfatfs-base:1.1.1.1
	gcc-12-3-0:1.1.1.1
	FSF:1.1.1;
locks; strict;
comment	@ * @;


1.1
date	2023.07.30.05.21.20;	author mrg;	state Exp;
branches
	1.1.1.1;
next	;
commitid	tk6nV4mbc9nVEMyE;

1.1.1.1
date	2023.07.30.05.21.20;	author mrg;	state Exp;
branches;
next	1.1.1.2;
commitid	tk6nV4mbc9nVEMyE;

1.1.1.2
date	2025.09.13.23.45.48;	author mrg;	state Exp;
branches;
next	;
commitid	KwhwN4krNWa6XBaG;


desc
@@


1.1
log
@Initial revision
@
text
@// std::thread declarations -*- C++ -*-

// Copyright (C) 2008-2022 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 bits/std_thread.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @@headername{thread}
 */

#ifndef _GLIBCXX_THREAD_H
#define _GLIBCXX_THREAD_H 1

#pragma GCC system_header

#if __cplusplus >= 201103L
#include <bits/c++config.h>

#include <iosfwd>		// std::basic_ostream
#include <tuple>		// std::tuple
#include <bits/functional_hash.h> // std::hash
#include <bits/invoke.h>	// std::__invoke
#include <bits/refwrap.h>       // not required, but helpful to users
#include <bits/unique_ptr.h>	// std::unique_ptr

#ifdef _GLIBCXX_HAS_GTHREADS
# include <bits/gthr.h>
#else
# include <errno.h>
# include <bits/functexcept.h>
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /** @@addtogroup threads
   *  @@{
   */

  /** A std::thread represents a new thread of execution.
   *
   * The default constructor creates an object that does not own a thread.
   * The `thread(F&&, Args&&...)` constructor invokes a callable in a new
   * thread, and owns that new thread. A `std::thread` that owns a thread
   * is *joinable*. Joining a thread waits for it to finish executing,
   * which happens when the callable running in that thread returns.
   *
   * A `std::thread` cannot be copied, but can be moved. Moving a joinable
   * object transfers ownership of its thread to another object.
   *
   * A joinable `std::thread` must be explicitly joined (or detached) before
   * it is destroyed or assigned to. Attempting to destroy a joinable thread
   * will terminate the whole process.
   *
   * @@headerfile thread
   * @@since C++11
   */
  class thread
  {
  public:
#ifdef _GLIBCXX_HAS_GTHREADS
    // Abstract base class for types that wrap arbitrary functors to be
    // invoked in the new thread of execution.
    struct _State
    {
      virtual ~_State();
      virtual void _M_run() = 0;
    };
    using _State_ptr = unique_ptr<_State>;

    using native_handle_type = __gthread_t;
#else
    using native_handle_type = int;
#endif

    /** A std::thread::id is a unique identifier for a thread.
     *
     * @@headerfile thread
     * @@since C++11
     */
    class id
    {
      native_handle_type	_M_thread;

    public:
      id() noexcept : _M_thread() { }

      explicit
      id(native_handle_type __id) : _M_thread(__id) { }

    private:
      friend class thread;
      friend struct hash<id>;

      friend bool
      operator==(id __x, id __y) noexcept;

#if __cpp_lib_three_way_comparison
      friend strong_ordering
      operator<=>(id __x, id __y) noexcept;
#else
      friend bool
      operator<(id __x, id __y) noexcept;
#endif

      template<class _CharT, class _Traits>
	friend basic_ostream<_CharT, _Traits>&
	operator<<(basic_ostream<_CharT, _Traits>& __out, id __id);
    };

  private:
    id				_M_id;

    // _GLIBCXX_RESOLVE_LIB_DEFECTS
    // 2097.  packaged_task constructors should be constrained
    // 3039. Unnecessary decay in thread and packaged_task
    template<typename _Tp>
      using __not_same = __not_<is_same<__remove_cvref_t<_Tp>, thread>>;

  public:
    thread() noexcept = default;

#ifdef _GLIBCXX_HAS_GTHREADS
    template<typename _Callable, typename... _Args,
	     typename = _Require<__not_same<_Callable>>>
      explicit
      thread(_Callable&& __f, _Args&&... __args)
      {
	static_assert( __is_invocable<typename decay<_Callable>::type,
				      typename decay<_Args>::type...>::value,
	  "std::thread arguments must be invocable after conversion to rvalues"
	  );

#ifdef GTHR_ACTIVE_PROXY
	// Create a reference to pthread_create, not just the gthr weak symbol.
	auto __depend = reinterpret_cast<void(*)()>(&pthread_create);
#else
	auto __depend = nullptr;
#endif
	using _Wrapper = _Call_wrapper<_Callable, _Args...>;
	// Create a call wrapper with DECAY_COPY(__f) as its target object
	// and DECAY_COPY(__args)... as its bound argument entities.
	_M_start_thread(_State_ptr(new _State_impl<_Wrapper>(
	      std::forward<_Callable>(__f), std::forward<_Args>(__args)...)),
	    __depend);
      }
#endif // _GLIBCXX_HAS_GTHREADS

    ~thread()
    {
      if (joinable())
	std::__terminate();
    }

    thread(const thread&) = delete;

    thread(thread&& __t) noexcept
    { swap(__t); }

    thread& operator=(const thread&) = delete;

    thread& operator=(thread&& __t) noexcept
    {
      if (joinable())
	std::__terminate();
      swap(__t);
      return *this;
    }

    void
    swap(thread& __t) noexcept
    { std::swap(_M_id, __t._M_id); }

    bool
    joinable() const noexcept
    { return !(_M_id == id()); }

    void
    join();

    void
    detach();

    id
    get_id() const noexcept
    { return _M_id; }

    /** @@pre thread is joinable
     */
    native_handle_type
    native_handle()
    { return _M_id._M_thread; }

    // Returns a value that hints at the number of hardware thread contexts.
    static unsigned int
    hardware_concurrency() noexcept;

#ifdef _GLIBCXX_HAS_GTHREADS
  private:
    template<typename _Callable>
      struct _State_impl : public _State
      {
	_Callable		_M_func;

	template<typename... _Args>
	  _State_impl(_Args&&... __args)
	  : _M_func(std::forward<_Args>(__args)...)
	  { }

	void
	_M_run() { _M_func(); }
      };

    void
    _M_start_thread(_State_ptr, void (*)());

#if _GLIBCXX_THREAD_ABI_COMPAT
  public:
    struct _Impl_base;
    typedef shared_ptr<_Impl_base>	__shared_base_type;
    struct _Impl_base
    {
      __shared_base_type	_M_this_ptr;
      virtual ~_Impl_base() = default;
      virtual void _M_run() = 0;
    };

  private:
    void
    _M_start_thread(__shared_base_type, void (*)());

    void
    _M_start_thread(__shared_base_type);
#endif

  private:
    // A call wrapper that does INVOKE(forwarded tuple elements...)
    template<typename _Tuple>
      struct _Invoker
      {
	template<typename... _Args>
	  explicit
	  _Invoker(_Args&&... __args)
	  : _M_t(std::forward<_Args>(__args)...)
	  { }

	_Tuple _M_t;

	template<typename>
	  struct __result;
	template<typename _Fn, typename... _Args>
	  struct __result<tuple<_Fn, _Args...>>
	  : __invoke_result<_Fn, _Args...>
	  { };

	template<size_t... _Ind>
	  typename __result<_Tuple>::type
	  _M_invoke(_Index_tuple<_Ind...>)
	  { return std::__invoke(std::get<_Ind>(std::move(_M_t))...); }

	typename __result<_Tuple>::type
	operator()()
	{
	  using _Indices
	    = typename _Build_index_tuple<tuple_size<_Tuple>::value>::__type;
	  return _M_invoke(_Indices());
	}
      };

  public:
    /// @@cond undocumented
    template<typename... _Tp>
      using _Call_wrapper = _Invoker<tuple<typename decay<_Tp>::type...>>;
    /// @@endcond
#endif // _GLIBCXX_HAS_GTHREADS
  };

#ifndef _GLIBCXX_HAS_GTHREADS
  inline void thread::join() { std::__throw_system_error(EINVAL); }
  inline void thread::detach() { std::__throw_system_error(EINVAL); }
  inline unsigned int thread::hardware_concurrency() noexcept { return 0; }
#endif

  /// @@relates std::thread
  inline void
  swap(thread& __x, thread& __y) noexcept
  { __x.swap(__y); }

  /// @@relates std::thread::id
  inline bool
  operator==(thread::id __x, thread::id __y) noexcept
  {
    // pthread_equal is undefined if either thread ID is not valid, so we
    // can't safely use __gthread_equal on default-constructed values (nor
    // the non-zero value returned by this_thread::get_id() for
    // single-threaded programs using GNU libc). Assume EqualityComparable.
    return __x._M_thread == __y._M_thread;
  }

  // N.B. other comparison operators are defined in <thread>

  // DR 889.
  /// std::hash specialization for thread::id.
  template<>
    struct hash<thread::id>
    : public __hash_base<size_t, thread::id>
    {
      size_t
      operator()(const thread::id& __id) const noexcept
      { return std::_Hash_impl::hash(__id._M_thread); }
    };

  namespace this_thread
  {
    /// The unique identifier of the current thread.
    inline thread::id
    get_id() noexcept
    {
#ifndef _GLIBCXX_HAS_GTHREADS
      return thread::id(1);
#elif defined _GLIBCXX_NATIVE_THREAD_ID
      return thread::id(_GLIBCXX_NATIVE_THREAD_ID);
#else
      return thread::id(__gthread_self());
#endif
    }

    /// Allow the implementation to schedule a different thread.
    inline void
    yield() noexcept
    {
#if defined _GLIBCXX_HAS_GTHREADS && defined _GLIBCXX_USE_SCHED_YIELD
      __gthread_yield();
#endif
    }

  } // namespace this_thread

  /// @@}

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // C++11

#endif // _GLIBCXX_THREAD_H
@


1.1.1.1
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@@


1.1.1.2
log
@initial import of GCC 14.3.0.

major changes in GCC 13:
- improved sanitizer
- zstd debug info compression
- LTO improvements
- SARIF based diagnostic support
- new warnings: -Wxor-used-as-pow, -Wenum-int-mismatch, -Wself-move,
  -Wdangling-reference
- many new -Wanalyzer* specific warnings
- enhanced warnings: -Wpessimizing-move, -Wredundant-move
- new attributes to mark file descriptors, c++23 "assume"
- several C23 features added
- several C++23 features added
- many new features for Arm, x86, RISC-V

major changes in GCC 14:
- more strict C99 or newer support
- ia64* marked deprecated (but seemingly still in GCC 15.)
- several new hardening features
- support for "hardbool", which can have user supplied values of true/false
- explicit support for stack scrubbing upon function exit
- better auto-vectorisation support
- added clang-compatible __has_feature and __has_extension
- more C23, including -std=c23
- several C++26 features added
- better diagnostics in C++ templates
- new warnings: -Wnrvo, Welaborated-enum-base
- many new features for Arm, x86, RISC-V
- possible ABI breaking change for SPARC64 and small structures with arrays
  of floats.
@
text
@d3 1
a3 1
// Copyright (C) 2008-2024 Free Software Foundation, Inc.
a55 4
#if __glibcxx_formatters
  template<typename, typename> class formatter;
#endif

d82 9
a128 5

#if __glibcxx_formatters
      friend formatter<id, char>;
      friend formatter<id, wchar_t>;
#endif
d135 1
a135 1
    // 2097. packaged_task constructors should be constrained
a143 16
  private:
    // This adds to user code that creates std:thread objects (because
    // it is called by the template ctor below) strong references to
    // pthread_create and pthread_join, which ensures they are both
    // linked in even during static linking.  We can't depend on
    // gthread calls to bring them in, because those may use weak
    // references.
    static void
    _M_thread_deps_never_run() {
#ifdef GTHR_ACTIVE_PROXY
      reinterpret_cast<void (*)(void)>(&pthread_create)();
      reinterpret_cast<void (*)(void)>(&pthread_join)();
#endif
    }

  public:
d154 6
d165 1
a165 1
	    _M_thread_deps_never_run);
a218 12
#ifndef _GLIBCXX_THREAD_IMPL
  private:
#endif
    // Abstract base class for types that wrap arbitrary functors to be
    // invoked in the new thread of execution.
    struct _State
    {
      virtual ~_State();
      virtual void _M_run() = 0;
    };
    using _State_ptr = unique_ptr<_State>;

@