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Name	Size	Permission
algorithmfwd.h	23.97 KB	-rw-r--r--
align.h	3.62 KB	-rw-r--r--
alloc_traits.h	27.03 KB	-rw-r--r--
allocated_ptr.h	3.25 KB	-rw-r--r--
allocator.h	9.55 KB	-rw-r--r--
atomic_base.h	56.73 KB	-rw-r--r--
atomic_futex.h	12.08 KB	-rw-r--r--
atomic_lockfree_defines.h	2.3 KB	-rw-r--r--
atomic_timed_wait.h	13.18 KB	-rw-r--r--
atomic_wait.h	12.2 KB	-rw-r--r--
basic_ios.h	15.7 KB	-rw-r--r--
basic_ios.tcc	5.96 KB	-rw-r--r--
basic_string.h	149.19 KB	-rw-r--r--
basic_string.tcc	33.76 KB	-rw-r--r--
boost_concept_check.h	29.13 KB	-rw-r--r--
c++0x_warning.h	1.44 KB	-rw-r--r--
char_traits.h	28.54 KB	-rw-r--r--
charconv.h	3.35 KB	-rw-r--r--
chrono.h	41.53 KB	-rw-r--r--
codecvt.h	24.9 KB	-rw-r--r--
concept_check.h	3.34 KB	-rw-r--r--
cow_string.h	129.11 KB	-rw-r--r--
cpp_type_traits.h	13.72 KB	-rw-r--r--
cxxabi_forced.h	1.77 KB	-rw-r--r--
cxxabi_init_exception.h	2.17 KB	-rw-r--r--
deque.tcc	41.38 KB	-rw-r--r--
enable_special_members.h	12.16 KB	-rw-r--r--
erase_if.h	2.09 KB	-rw-r--r--
exception.h	2.45 KB	-rw-r--r--
exception_defines.h	1.61 KB	-rw-r--r--
exception_ptr.h	7.73 KB	-rw-r--r--
forward_list.h	49.87 KB	-rw-r--r--
forward_list.tcc	13.71 KB	-rw-r--r--
fs_dir.h	16.23 KB	-rw-r--r--
fs_fwd.h	10.66 KB	-rw-r--r--
fs_ops.h	10.49 KB	-rw-r--r--
fs_path.h	40.57 KB	-rw-r--r--
fstream.tcc	32.88 KB	-rw-r--r--
functexcept.h	3.43 KB	-rw-r--r--
functional_hash.h	8.51 KB	-rw-r--r--
gslice.h	5.39 KB	-rw-r--r--
gslice_array.h	7.67 KB	-rw-r--r--
hash_bytes.h	2.1 KB	-rw-r--r--
hashtable.h	87.83 KB	-rw-r--r--
hashtable_policy.h	63.21 KB	-rw-r--r--
indirect_array.h	7.68 KB	-rw-r--r--
invoke.h	5.92 KB	-rw-r--r--
ios_base.h	31.43 KB	-rw-r--r--
istream.tcc	31.38 KB	-rw-r--r--
iterator_concepts.h	32.61 KB	-rw-r--r--
list.tcc	17.62 KB	-rw-r--r--
locale_classes.h	24.46 KB	-rw-r--r--
locale_classes.tcc	8.18 KB	-rw-r--r--
locale_conv.h	18.74 KB	-rw-r--r--
locale_facets.h	91.72 KB	-rw-r--r--
locale_facets.tcc	39.51 KB	-rw-r--r--
locale_facets_nonio.h	69.1 KB	-rw-r--r--
locale_facets_nonio.tcc	53.76 KB	-rw-r--r--
localefwd.h	5.8 KB	-rw-r--r--
mask_array.h	7.5 KB	-rw-r--r--
max_size_type.h	21.96 KB	-rw-r--r--
memoryfwd.h	2.45 KB	-rw-r--r--
mofunc_impl.h	7.52 KB	-rw-r--r--
move.h	6.63 KB	-rw-r--r--
move_only_function.h	5.73 KB	-rw-r--r--
nested_exception.h	4.77 KB	-rw-r--r--
new_allocator.h	6.47 KB	-rw-r--r--
node_handle.h	10.67 KB	-rw-r--r--
ostream.tcc	11.69 KB	-rw-r--r--
ostream_insert.h	3.94 KB	-rw-r--r--
parse_numbers.h	7.8 KB	-rw-r--r--
postypes.h	7.33 KB	-rw-r--r--
predefined_ops.h	9.94 KB	-rw-r--r--
ptr_traits.h	8.88 KB	-rw-r--r--
quoted_string.h	4.93 KB	-rw-r--r--
random.h	174.24 KB	-rw-r--r--
random.tcc	103.38 KB	-rw-r--r--
range_access.h	10.97 KB	-rw-r--r--
ranges_algo.h	114.1 KB	-rw-r--r--
ranges_algobase.h	18.4 KB	-rw-r--r--
ranges_base.h	25.61 KB	-rw-r--r--
ranges_cmp.h	5.83 KB	-rw-r--r--
ranges_uninitialized.h	17.71 KB	-rw-r--r--
ranges_util.h	21.3 KB	-rw-r--r--
refwrap.h	13.21 KB	-rw-r--r--
regex.h	101.77 KB	-rw-r--r--
regex.tcc	16.13 KB	-rw-r--r--
regex_automaton.h	10.54 KB	-rw-r--r--
regex_automaton.tcc	7.58 KB	-rw-r--r--
regex_compiler.h	15.92 KB	-rw-r--r--
regex_compiler.tcc	18.38 KB	-rw-r--r--
regex_constants.h	14.51 KB	-rw-r--r--
regex_error.h	5.03 KB	-rw-r--r--
regex_executor.h	8.8 KB	-rw-r--r--
regex_executor.tcc	18.41 KB	-rw-r--r--
regex_scanner.h	6.88 KB	-rw-r--r--
regex_scanner.tcc	14.54 KB	-rw-r--r--
semaphore_base.h	7.7 KB	-rw-r--r--
shared_ptr.h	38.14 KB	-rw-r--r--
shared_ptr_atomic.h	20.7 KB	-rw-r--r--
shared_ptr_base.h	65.23 KB	-rw-r--r--
slice_array.h	9.35 KB	-rw-r--r--
specfun.h	46.13 KB	-rw-r--r--
sstream.tcc	9.91 KB	-rw-r--r--
std_abs.h	3.37 KB	-rw-r--r--
std_function.h	22.34 KB	-rw-r--r--
std_mutex.h	6.27 KB	-rw-r--r--
std_thread.h	8.24 KB	-rw-r--r--
stl_algo.h	210.67 KB	-rw-r--r--
stl_algobase.h	75.01 KB	-rw-r--r--
stl_bvector.h	40.27 KB	-rw-r--r--
stl_construct.h	8.46 KB	-rw-r--r--
stl_deque.h	76.34 KB	-rw-r--r--
stl_function.h	43.97 KB	-rw-r--r--
stl_heap.h	20.31 KB	-rw-r--r--
stl_iterator.h	79.65 KB	-rw-r--r--
stl_iterator_base_funcs.h	8.57 KB	-rw-r--r--
stl_iterator_base_types.h	9.46 KB	-rw-r--r--
stl_list.h	70.68 KB	-rw-r--r--
stl_map.h	54.8 KB	-rw-r--r--
stl_multimap.h	42.67 KB	-rw-r--r--
stl_multiset.h	36.84 KB	-rw-r--r--
stl_numeric.h	14.26 KB	-rw-r--r--
stl_pair.h	29.41 KB	-rw-r--r--
stl_queue.h	28.06 KB	-rw-r--r--
stl_raw_storage_iter.h	3.91 KB	-rw-r--r--
stl_relops.h	4.47 KB	-rw-r--r--
stl_set.h	37.09 KB	-rw-r--r--
stl_stack.h	13.71 KB	-rw-r--r--
stl_tempbuf.h	8.48 KB	-rw-r--r--
stl_tree.h	72.04 KB	-rw-r--r--
stl_uninitialized.h	35.32 KB	-rw-r--r--
stl_vector.h	68.73 KB	-rw-r--r--
stream_iterator.h	8.09 KB	-rw-r--r--
streambuf.tcc	4.58 KB	-rw-r--r--
streambuf_iterator.h	15.53 KB	-rw-r--r--
string_view.tcc	7 KB	-rw-r--r--
stringfwd.h	2.56 KB	-rw-r--r--
this_thread_sleep.h	3.21 KB	-rw-r--r--
uniform_int_dist.h	12.77 KB	-rw-r--r--
unique_lock.h	6.01 KB	-rw-r--r--
unique_ptr.h	35.54 KB	-rw-r--r--
unordered_map.h	74.87 KB	-rw-r--r--
unordered_set.h	61.46 KB	-rw-r--r--
uses_allocator.h	6.74 KB	-rw-r--r--
uses_allocator_args.h	6.96 KB	-rw-r--r--
utility.h	8.12 KB	-rw-r--r--
valarray_after.h	22.74 KB	-rw-r--r--
valarray_array.h	20.8 KB	-rw-r--r--
valarray_array.tcc	7.08 KB	-rw-r--r--
valarray_before.h	18.69 KB	-rw-r--r--
vector.tcc	30.82 KB	-rw-r--r--

Code Editor : semaphore_base.h

// -*- C++ -*- header.

// Copyright (C) 2020-2022 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/semaphore_base.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{semaphore}
 */

#ifndef _GLIBCXX_SEMAPHORE_BASE_H
#define _GLIBCXX_SEMAPHORE_BASE_H 1

#pragma GCC system_header

#include <bits/atomic_base.h>
#include <bits/chrono.h>
#if __cpp_lib_atomic_wait
#include <bits/atomic_timed_wait.h>
#include <ext/numeric_traits.h>
#endif // __cpp_lib_atomic_wait

#ifdef _GLIBCXX_HAVE_POSIX_SEMAPHORE
# include <cerrno>	// errno, EINTR, EAGAIN etc.
# include <limits.h>	// SEM_VALUE_MAX
# include <semaphore.h>	// sem_t, sem_init, sem_wait, sem_post etc.
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

#ifdef _GLIBCXX_HAVE_POSIX_SEMAPHORE
  struct __platform_semaphore
  {
    using __clock_t = chrono::system_clock;
#ifdef SEM_VALUE_MAX
    static constexpr ptrdiff_t _S_max = SEM_VALUE_MAX;
#else
    static constexpr ptrdiff_t _S_max = _POSIX_SEM_VALUE_MAX;
#endif

explicit __platform_semaphore(ptrdiff_t __count) noexcept
    {
      sem_init(&_M_semaphore, 0, __count);
    }

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

~__platform_semaphore()
    { sem_destroy(&_M_semaphore); }

_GLIBCXX_ALWAYS_INLINE void
    _M_acquire() noexcept
    {
      for (;;)
	{
	  auto __err = sem_wait(&_M_semaphore);
	  if (__err && (errno == EINTR))
	    continue;
	  else if (__err)
	    std::__terminate();
	  else
	    break;
	}
    }

_GLIBCXX_ALWAYS_INLINE bool
    _M_try_acquire() noexcept
    {
      for (;;)
	{
	  auto __err = sem_trywait(&_M_semaphore);
	  if (__err && (errno == EINTR))
	    continue;
	  else if (__err && (errno == EAGAIN))
	    return false;
	  else if (__err)
	    std::__terminate();
	  else
	    break;
	}
      return true;
    }

_GLIBCXX_ALWAYS_INLINE void
    _M_release(std::ptrdiff_t __update) noexcept
    {
      for(; __update != 0; --__update)
	{
	   auto __err = sem_post(&_M_semaphore);
	   if (__err)
	     std::__terminate();
	}
    }

bool
    _M_try_acquire_until_impl(const chrono::time_point<__clock_t>& __atime)
      noexcept
    {

auto __s = chrono::time_point_cast<chrono::seconds>(__atime);
      auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);

struct timespec __ts =
      {
	static_cast<std::time_t>(__s.time_since_epoch().count()),
	static_cast<long>(__ns.count())
      };

for (;;)
	{
	  if (auto __err = sem_timedwait(&_M_semaphore, &__ts))
	    {
	      if (errno == EINTR)
		continue;
	      else if (errno == ETIMEDOUT || errno == EINVAL)
		return false;
	      else
		std::__terminate();
	    }
	  else
	    break;
	}
      return true;
    }

template<typename _Clock, typename _Duration>
      bool
      _M_try_acquire_until(const chrono::time_point<_Clock,
			   _Duration>& __atime) noexcept
      {
	if constexpr (std::is_same_v<__clock_t, _Clock>)
	  {
	    return _M_try_acquire_until_impl(__atime);
	  }
	else
	  {
	    const typename _Clock::time_point __c_entry = _Clock::now();
	    const auto __s_entry = __clock_t::now();
	    const auto __delta = __atime - __c_entry;
	    const auto __s_atime = __s_entry + __delta;
	    if (_M_try_acquire_until_impl(__s_atime))
	      return true;

// We got a timeout when measured against __clock_t but
	    // we need to check against the caller-supplied clock
	    // to tell whether we should return a timeout.
	    return (_Clock::now() < __atime);
	  }
      }

template<typename _Rep, typename _Period>
      _GLIBCXX_ALWAYS_INLINE bool
      _M_try_acquire_for(const chrono::duration<_Rep, _Period>& __rtime)
	noexcept
      { return _M_try_acquire_until(__clock_t::now() + __rtime); }

private:
    sem_t _M_semaphore;
  };
#endif // _GLIBCXX_HAVE_POSIX_SEMAPHORE

#if __cpp_lib_atomic_wait
  struct __atomic_semaphore
  {
    static constexpr ptrdiff_t _S_max = __gnu_cxx::__int_traits<int>::__max;
    explicit __atomic_semaphore(__detail::__platform_wait_t __count) noexcept
      : _M_counter(__count)
    {
      __glibcxx_assert(__count >= 0 && __count <= _S_max);
    }

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

static _GLIBCXX_ALWAYS_INLINE bool
    _S_do_try_acquire(__detail::__platform_wait_t* __counter) noexcept
    {
      auto __old = __atomic_impl::load(__counter, memory_order::acquire);
      if (__old == 0)
	return false;

return __atomic_impl::compare_exchange_strong(__counter,
						    __old, __old - 1,
						    memory_order::acquire,
						    memory_order::relaxed);
    }

_GLIBCXX_ALWAYS_INLINE void
    _M_acquire() noexcept
    {
      auto const __pred =
	[this] { return _S_do_try_acquire(&this->_M_counter); };
      std::__atomic_wait_address_bare(&_M_counter, __pred);
    }

bool
    _M_try_acquire() noexcept
    {
      auto const __pred =
	[this] { return _S_do_try_acquire(&this->_M_counter); };
      return std::__detail::__atomic_spin(__pred);
    }

template<typename _Clock, typename _Duration>
      _GLIBCXX_ALWAYS_INLINE bool
      _M_try_acquire_until(const chrono::time_point<_Clock,
			   _Duration>& __atime) noexcept
      {
	auto const __pred =
	  [this] { return _S_do_try_acquire(&this->_M_counter); };

return __atomic_wait_address_until_bare(&_M_counter, __pred, __atime);
      }

template<typename _Rep, typename _Period>
      _GLIBCXX_ALWAYS_INLINE bool
      _M_try_acquire_for(const chrono::duration<_Rep, _Period>& __rtime)
	noexcept
      {
	auto const __pred =
	  [this] { return _S_do_try_acquire(&this->_M_counter); };

return __atomic_wait_address_for_bare(&_M_counter, __pred, __rtime);
      }

_GLIBCXX_ALWAYS_INLINE void
    _M_release(ptrdiff_t __update) noexcept
    {
      if (0 < __atomic_impl::fetch_add(&_M_counter, __update, memory_order_release))
	return;
      if (__update > 1)
	__atomic_notify_address_bare(&_M_counter, true);
      else
	__atomic_notify_address_bare(&_M_counter, true);
// FIXME - Figure out why this does not wake a waiting thread
//	__atomic_notify_address_bare(&_M_counter, false);
    }

private:
    alignas(__detail::__platform_wait_alignment)
    __detail::__platform_wait_t _M_counter;
  };
#endif // __cpp_lib_atomic_wait

// Note: the _GLIBCXX_USE_POSIX_SEMAPHORE macro can be used to force the
// use of Posix semaphores (sem_t). Doing so however, alters the ABI.
#if defined __cpp_lib_atomic_wait && !_GLIBCXX_USE_POSIX_SEMAPHORE
  using __semaphore_impl = __atomic_semaphore;
#elif _GLIBCXX_HAVE_POSIX_SEMAPHORE
  using __semaphore_impl = __platform_semaphore;
#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // _GLIBCXX_SEMAPHORE_BASE_H

${this.title}

Code Editor : semaphore_base.h