--- /dev/null
+// Support for concurrent programing -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 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 concurrence.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _CONCURRENCE_H
+#define _CONCURRENCE_H 1
+
+#include <exception>
+#include <bits/gthr.h>
+#include <bits/functexcept.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+ // Available locking policies:
+ // _S_single single-threaded code that doesn't need to be locked.
+ // _S_mutex multi-threaded code that requires additional support
+ // from gthr.h or abstraction layers in concurrence.h.
+ // _S_atomic multi-threaded code using atomic operations.
+ enum _Lock_policy { _S_single, _S_mutex, _S_atomic };
+
+ // Compile time constant that indicates prefered locking policy in
+ // the current configuration.
+ static const _Lock_policy __default_lock_policy =
+#ifdef __GTHREADS
+#if (defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2) \
+ && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4))
+ _S_atomic;
+#else
+ _S_mutex;
+#endif
+#else
+ _S_single;
+#endif
+
+ // NB: As this is used in libsupc++, need to only depend on
+ // exception. No stdexception classes, no use of std::string.
+ class __concurrence_lock_error : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const throw()
+ { return "__gnu_cxx::__concurrence_lock_error"; }
+ };
+
+ class __concurrence_unlock_error : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const throw()
+ { return "__gnu_cxx::__concurrence_unlock_error"; }
+ };
+
+ class __concurrence_broadcast_error : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const throw()
+ { return "__gnu_cxx::__concurrence_broadcast_error"; }
+ };
+
+ class __concurrence_wait_error : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const throw()
+ { return "__gnu_cxx::__concurrence_wait_error"; }
+ };
+
+ // Substitute for concurrence_error object in the case of -fno-exceptions.
+ inline void
+ __throw_concurrence_lock_error()
+ {
+#if __EXCEPTIONS
+ throw __concurrence_lock_error();
+#else
+ __builtin_abort();
+#endif
+ }
+
+ inline void
+ __throw_concurrence_unlock_error()
+ {
+#if __EXCEPTIONS
+ throw __concurrence_unlock_error();
+#else
+ __builtin_abort();
+#endif
+ }
+
+#ifdef __GTHREAD_HAS_COND
+ inline void
+ __throw_concurrence_broadcast_error()
+ {
+#if __EXCEPTIONS
+ throw __concurrence_broadcast_error();
+#else
+ __builtin_abort();
+#endif
+ }
+
+ inline void
+ __throw_concurrence_wait_error()
+ {
+#if __EXCEPTIONS
+ throw __concurrence_wait_error();
+#else
+ __builtin_abort();
+#endif
+ }
+#endif
+
+ class __mutex
+ {
+ private:
+ __gthread_mutex_t _M_mutex;
+
+ __mutex(const __mutex&);
+ __mutex& operator=(const __mutex&);
+
+ public:
+ __mutex()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+#if defined __GTHREAD_MUTEX_INIT
+ __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
+ _M_mutex = __tmp;
+#else
+ __GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
+#endif
+ }
+#endif
+ }
+
+ void lock()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+ if (__gthread_mutex_lock(&_M_mutex) != 0)
+ __throw_concurrence_lock_error();
+ }
+#endif
+ }
+
+ void unlock()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+ if (__gthread_mutex_unlock(&_M_mutex) != 0)
+ __throw_concurrence_unlock_error();
+ }
+#endif
+ }
+
+ __gthread_mutex_t* gthread_mutex(void)
+ { return &_M_mutex; }
+ };
+
+ class __recursive_mutex
+ {
+ private:
+ __gthread_recursive_mutex_t _M_mutex;
+
+ __recursive_mutex(const __recursive_mutex&);
+ __recursive_mutex& operator=(const __recursive_mutex&);
+
+ public:
+ __recursive_mutex()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+#if defined __GTHREAD_RECURSIVE_MUTEX_INIT
+ __gthread_recursive_mutex_t __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
+ _M_mutex = __tmp;
+#else
+ __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
+#endif
+ }
+#endif
+ }
+
+ void lock()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+ if (__gthread_recursive_mutex_lock(&_M_mutex) != 0)
+ __throw_concurrence_lock_error();
+ }
+#endif
+ }
+
+ void unlock()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+ if (__gthread_recursive_mutex_unlock(&_M_mutex) != 0)
+ __throw_concurrence_unlock_error();
+ }
+#endif
+ }
+
+ __gthread_recursive_mutex_t* gthread_recursive_mutex(void)
+ { return &_M_mutex; }
+ };
+
+ /// Scoped lock idiom.
+ // Acquire the mutex here with a constructor call, then release with
+ // the destructor call in accordance with RAII style.
+ class __scoped_lock
+ {
+ public:
+ typedef __mutex __mutex_type;
+
+ private:
+ __mutex_type& _M_device;
+
+ __scoped_lock(const __scoped_lock&);
+ __scoped_lock& operator=(const __scoped_lock&);
+
+ public:
+ explicit __scoped_lock(__mutex_type& __name) : _M_device(__name)
+ { _M_device.lock(); }
+
+ ~__scoped_lock() throw()
+ { _M_device.unlock(); }
+ };
+
+#ifdef __GTHREAD_HAS_COND
+ class __cond
+ {
+ private:
+ __gthread_cond_t _M_cond;
+
+ __cond(const __cond&);
+ __cond& operator=(const __cond&);
+
+ public:
+ __cond()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+#if defined __GTHREAD_COND_INIT
+ __gthread_cond_t __tmp = __GTHREAD_COND_INIT;
+ _M_cond = __tmp;
+#else
+ __GTHREAD_COND_INIT_FUNCTION(&_M_cond);
+#endif
+ }
+#endif
+ }
+
+ void broadcast()
+ {
+#if __GTHREADS
+ if (__gthread_active_p())
+ {
+ if (__gthread_cond_broadcast(&_M_cond) != 0)
+ __throw_concurrence_broadcast_error();
+ }
+#endif
+ }
+
+ void wait(__mutex *mutex)
+ {
+#if __GTHREADS
+ {
+ if (__gthread_cond_wait(&_M_cond, mutex->gthread_mutex()) != 0)
+ __throw_concurrence_wait_error();
+ }
+#endif
+ }
+
+ void wait_recursive(__recursive_mutex *mutex)
+ {
+#if __GTHREADS
+ {
+ if (__gthread_cond_wait_recursive(&_M_cond,
+ mutex->gthread_recursive_mutex())
+ != 0)
+ __throw_concurrence_wait_error();
+ }
+#endif
+ }
+ };
+#endif
+
+_GLIBCXX_END_NAMESPACE
+
+#endif
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