Add mutex and shared_mutex headers back

include/bits/error_constants.h

@@ -0,0 +1,180 @@
+// Specific definitions for generic platforms  -*- C++ -*-
+
+// 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 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/error_constants.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{system_error}
+ */
+
+#ifndef _GLIBCXX_ERROR_CONSTANTS
+#define _GLIBCXX_ERROR_CONSTANTS 1
+
+#include <bits/c++config.h>
+#include <cerrno>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  enum class errc
+    {
+      address_family_not_supported = 		EAFNOSUPPORT,
+      address_in_use = 				EADDRINUSE,
+      address_not_available = 			EADDRNOTAVAIL,
+      already_connected = 			EISCONN,
+      argument_list_too_long = 			E2BIG,
+      argument_out_of_domain = 			EDOM,
+      bad_address = 				EFAULT,
+      bad_file_descriptor = 			EBADF,
+
+#ifdef EBADMSG
+      bad_message = 				EBADMSG,
+#endif
+
+      broken_pipe = 				EPIPE,
+      connection_aborted = 			ECONNABORTED,
+      connection_already_in_progress = 		EALREADY,
+      connection_refused = 			ECONNREFUSED,
+      connection_reset = 			ECONNRESET,
+      cross_device_link = 			EXDEV,
+      destination_address_required = 		EDESTADDRREQ,
+      device_or_resource_busy = 		EBUSY,
+      directory_not_empty = 			ENOTEMPTY,
+      executable_format_error = 		ENOEXEC,
+      file_exists = 	       			EEXIST,
+      file_too_large = 				EFBIG,
+      filename_too_long = 			ENAMETOOLONG,
+      function_not_supported = 			ENOSYS,
+      host_unreachable = 			EHOSTUNREACH,
+
+#ifdef EIDRM
+      identifier_removed = 			EIDRM,
+#endif
+
+      illegal_byte_sequence = 			EILSEQ,
+      inappropriate_io_control_operation = 	ENOTTY,
+      interrupted = 				EINTR,
+      invalid_argument = 			EINVAL,
+      invalid_seek = 				ESPIPE,
+      io_error = 				EIO,
+      is_a_directory = 				EISDIR,
+      message_size = 				EMSGSIZE,
+      network_down = 				ENETDOWN,
+      network_reset = 				ENETRESET,
+      network_unreachable = 			ENETUNREACH,
+      no_buffer_space = 			ENOBUFS,
+      no_child_process = 			ECHILD,
+
+#ifdef ENOLINK
+      no_link = 				ENOLINK,
+#endif
+
+      no_lock_available = 			ENOLCK,
+
+#ifdef ENODATA
+      no_message_available = 			ENODATA,
+#endif
+
+      no_message = 				ENOMSG,
+      no_protocol_option = 			ENOPROTOOPT,
+      no_space_on_device = 			ENOSPC,
+
+#ifdef ENOSR
+      no_stream_resources = 			ENOSR,
+#endif
+
+      no_such_device_or_address = 		ENXIO,
+      no_such_device = 				ENODEV,
+      no_such_file_or_directory = 		ENOENT,
+      no_such_process = 			ESRCH,
+      not_a_directory = 			ENOTDIR,
+      not_a_socket = 				ENOTSOCK,
+
+#ifdef ENOSTR
+      not_a_stream = 				ENOSTR,
+#endif
+
+      not_connected = 				ENOTCONN,
+      not_enough_memory = 			ENOMEM,
+
+#ifdef ENOTSUP
+      not_supported = 				ENOTSUP,
+#endif
+
+#ifdef ECANCELED
+      operation_canceled = 			ECANCELED,
+#endif
+
+      operation_in_progress = 			EINPROGRESS,
+      operation_not_permitted = 		EPERM,
+      operation_not_supported = 		EOPNOTSUPP,
+      operation_would_block = 			EWOULDBLOCK,
+
+#ifdef EOWNERDEAD
+      owner_dead = 				EOWNERDEAD,
+#endif
+
+      permission_denied = 			EACCES,
+
+#ifdef EPROTO
+      protocol_error = 				EPROTO,
+#endif
+
+      protocol_not_supported = 			EPROTONOSUPPORT,
+      read_only_file_system = 			EROFS,
+      resource_deadlock_would_occur = 		EDEADLK,
+      resource_unavailable_try_again = 		EAGAIN,
+      result_out_of_range = 			ERANGE,
+
+#ifdef ENOTRECOVERABLE
+      state_not_recoverable = 			ENOTRECOVERABLE,
+#endif
+
+#ifdef ETIME
+      stream_timeout = 				ETIME,
+#endif
+
+#ifdef ETXTBSY
+      text_file_busy = 				ETXTBSY,
+#endif
+
+      timed_out = 				ETIMEDOUT,
+      too_many_files_open_in_system = 		ENFILE,
+      too_many_files_open = 			EMFILE,
+      too_many_links = 				EMLINK,
+      too_many_symbolic_link_levels = 		ELOOP,
+
+#ifdef EOVERFLOW
+      value_too_large = 			EOVERFLOW,
+#elif defined __AVR__
+      value_too_large = 			999,
+#endif
+
+      wrong_protocol_type = 			EPROTOTYPE
+    };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif

include/bits/functexcept.h

@@ -38,6 +38,7 @@
 
 #include <bits/c++config.h>
 #include <bits/exception_defines.h>
+#include <bits/error_constants.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
@@ -90,6 +91,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   void
   __throw_underflow_error(const char* __s = "") __attribute__((__noreturn__));
 
+  // Helpers for exception objects in <system_error>
+  void
+  __throw_system_error(int) __attribute__((__noreturn__));
+
   // Helpers for exception objects in <functional>
   void
   __throw_bad_function_call() __attribute__((__noreturn__));

include/bits/std_mutex.h

@@ -0,0 +1,176 @@
+// std::mutex implementation -*- C++ -*-
+
+// Copyright (C) 2003-2020 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_mutex.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{mutex}
+ */
+
+#ifndef _GLIBCXX_MUTEX_H
+#define _GLIBCXX_MUTEX_H 1
+
+#pragma GCC system_header
+
+#if __cplusplus < 201103L
+# include <bits/c++0x_warning.h>
+#else
+
+#include <bits/functexcept.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * @defgroup mutexes Mutexes
+   * @ingroup concurrency
+   *
+   * Classes for mutex support.
+   * @{
+   */
+
+#ifdef _GLIBCXX_HAS_GTHREADS
+  // Common base class for std::mutex and std::timed_mutex
+  class __mutex_base
+  {
+  protected:
+    typedef __gthread_mutex_t			__native_type;
+
+#ifdef __GTHREAD_MUTEX_INIT
+    __native_type  _M_mutex = __GTHREAD_MUTEX_INIT;
+
+    constexpr __mutex_base() noexcept = default;
+#else
+    __native_type  _M_mutex;
+
+    __mutex_base() noexcept
+    {
+      // XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
+      __GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
+    }
+
+    ~__mutex_base() noexcept { __gthread_mutex_destroy(&_M_mutex); }
+#endif
+
+    __mutex_base(const __mutex_base&) = delete;
+    __mutex_base& operator=(const __mutex_base&) = delete;
+  };
+
+  /// The standard mutex type.
+  class mutex : private __mutex_base
+  {
+  public:
+    typedef __native_type* 			native_handle_type;
+
+#ifdef __GTHREAD_MUTEX_INIT
+    constexpr
+#endif
+    mutex() noexcept = default;
+    ~mutex() = default;
+
+    mutex(const mutex&) = delete;
+    mutex& operator=(const mutex&) = delete;
+
+    void
+    lock()
+    {
+      int __e = __gthread_mutex_lock(&_M_mutex);
+
+      // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
+      if (__e)
+	__throw_system_error(__e);
+    }
+
+    bool
+    try_lock() noexcept
+    {
+      // XXX EINVAL, EAGAIN, EBUSY
+      return !__gthread_mutex_trylock(&_M_mutex);
+    }
+
+    void
+    unlock()
+    {
+      // XXX EINVAL, EAGAIN, EPERM
+      __gthread_mutex_unlock(&_M_mutex);
+    }
+
+    native_handle_type
+    native_handle() noexcept
+    { return &_M_mutex; }
+  };
+
+#endif // _GLIBCXX_HAS_GTHREADS
+
+  /// Do not acquire ownership of the mutex.
+  struct defer_lock_t { explicit defer_lock_t() = default; };
+
+  /// Try to acquire ownership of the mutex without blocking.
+  struct try_to_lock_t { explicit try_to_lock_t() = default; };
+
+  /// Assume the calling thread has already obtained mutex ownership
+  /// and manage it.
+  struct adopt_lock_t { explicit adopt_lock_t() = default; };
+
+  /// Tag used to prevent a scoped lock from acquiring ownership of a mutex.
+  _GLIBCXX17_INLINE constexpr defer_lock_t	defer_lock { };
+
+  /// Tag used to prevent a scoped lock from blocking if a mutex is locked.
+  _GLIBCXX17_INLINE constexpr try_to_lock_t	try_to_lock { };
+
+  /// Tag used to make a scoped lock take ownership of a locked mutex.
+  _GLIBCXX17_INLINE constexpr adopt_lock_t	adopt_lock { };
+
+  /** @brief A simple scoped lock type.
+   *
+   * A lock_guard controls mutex ownership within a scope, releasing
+   * ownership in the destructor.
+   */
+  template<typename _Mutex>
+    class lock_guard
+    {
+    public:
+      typedef _Mutex mutex_type;
+
+      explicit lock_guard(mutex_type& __m) : _M_device(__m)
+      { _M_device.lock(); }
+
+      lock_guard(mutex_type& __m, adopt_lock_t) noexcept : _M_device(__m)
+      { } // calling thread owns mutex
+
+      ~lock_guard()
+      { _M_device.unlock(); }
+
+      lock_guard(const lock_guard&) = delete;
+      lock_guard& operator=(const lock_guard&) = delete;
+
+    private:
+      mutex_type&  _M_device;
+    };
+
+  // @} group mutexes
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+#endif // C++11
+#endif // _GLIBCXX_MUTEX_H