summaryrefslogtreecommitdiff
path: root/libstdc++-v3/include/std/condition_variable
diff options
context:
space:
mode:
Diffstat (limited to 'libstdc++-v3/include/std/condition_variable')
-rw-r--r--libstdc++-v3/include/std/condition_variable289
1 files changed, 289 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/condition_variable b/libstdc++-v3/include/std/condition_variable
new file mode 100644
index 000000000..0f75d8e44
--- /dev/null
+++ b/libstdc++-v3/include/std/condition_variable
@@ -0,0 +1,289 @@
+// <condition_variable> -*- C++ -*-
+
+// Copyright (C) 2008, 2009, 2010, 2011, 2012 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 include/condition_variable
+ * This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_CONDITION_VARIABLE
+#define _GLIBCXX_CONDITION_VARIABLE 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <bits/c++0x_warning.h>
+#else
+
+#include <chrono>
+#include <mutex> // unique_lock
+
+#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @defgroup condition_variables Condition Variables
+ * @ingroup concurrency
+ *
+ * Classes for condition_variable support.
+ * @{
+ */
+
+ /// cv_status
+ enum class cv_status { no_timeout, timeout };
+
+ /// condition_variable
+ class condition_variable
+ {
+ typedef chrono::system_clock __clock_t;
+ typedef __gthread_cond_t __native_type;
+ __native_type _M_cond;
+
+ public:
+ typedef __native_type* native_handle_type;
+
+ condition_variable() throw ();
+ ~condition_variable() throw ();
+
+ condition_variable(const condition_variable&) = delete;
+ condition_variable& operator=(const condition_variable&) = delete;
+
+ void
+ notify_one();
+
+ void
+ notify_all();
+
+ void
+ wait(unique_lock<mutex>& __lock);
+
+ template<typename _Predicate>
+ void
+ wait(unique_lock<mutex>& __lock, _Predicate __p)
+ {
+ while (!__p())
+ wait(__lock);
+ }
+
+ template<typename _Duration>
+ cv_status
+ wait_until(unique_lock<mutex>& __lock,
+ const chrono::time_point<__clock_t, _Duration>& __atime)
+ { return __wait_until_impl(__lock, __atime); }
+
+ template<typename _Clock, typename _Duration>
+ cv_status
+ wait_until(unique_lock<mutex>& __lock,
+ const chrono::time_point<_Clock, _Duration>& __atime)
+ {
+ // DR 887 - Sync unknown clock to known clock.
+ const typename _Clock::time_point __c_entry = _Clock::now();
+ const __clock_t::time_point __s_entry = __clock_t::now();
+ const chrono::nanoseconds __delta = __atime - __c_entry;
+ const __clock_t::time_point __s_atime = __s_entry + __delta;
+
+ return __wait_until_impl(__lock, __s_atime);
+ }
+
+ template<typename _Clock, typename _Duration, typename _Predicate>
+ bool
+ wait_until(unique_lock<mutex>& __lock,
+ const chrono::time_point<_Clock, _Duration>& __atime,
+ _Predicate __p)
+ {
+ while (!__p())
+ if (wait_until(__lock, __atime) == cv_status::timeout)
+ return __p();
+ return true;
+ }
+
+ template<typename _Rep, typename _Period>
+ cv_status
+ wait_for(unique_lock<mutex>& __lock,
+ const chrono::duration<_Rep, _Period>& __rtime)
+ { return wait_until(__lock, __clock_t::now() + __rtime); }
+
+ template<typename _Rep, typename _Period, typename _Predicate>
+ bool
+ wait_for(unique_lock<mutex>& __lock,
+ const chrono::duration<_Rep, _Period>& __rtime,
+ _Predicate __p)
+ { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
+
+ native_handle_type
+ native_handle()
+ { return &_M_cond; }
+
+ private:
+ template<typename _Clock, typename _Duration>
+ cv_status
+ __wait_until_impl(unique_lock<mutex>& __lock,
+ const chrono::time_point<_Clock, _Duration>& __atime)
+ {
+ chrono::time_point<__clock_t, chrono::seconds> __s =
+ chrono::time_point_cast<chrono::seconds>(__atime);
+
+ chrono::nanoseconds __ns =
+ chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
+
+ __gthread_time_t __ts =
+ {
+ static_cast<std::time_t>(__s.time_since_epoch().count()),
+ static_cast<long>(__ns.count())
+ };
+
+ __gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(),
+ &__ts);
+
+ return (_Clock::now() < __atime
+ ? cv_status::no_timeout : cv_status::timeout);
+ }
+ };
+
+ /// condition_variable_any
+ // Like above, but mutex is not required to have try_lock.
+ class condition_variable_any
+ {
+ typedef chrono::system_clock __clock_t;
+ condition_variable _M_cond;
+ mutex _M_mutex;
+
+ // scoped unlock - unlocks in ctor, re-locks in dtor
+ template<typename _Lock>
+ struct _Unlock
+ {
+ explicit _Unlock(_Lock& __lk) : _M_lock(__lk) { __lk.unlock(); }
+
+ ~_Unlock() noexcept(false)
+ {
+ if (uncaught_exception())
+ __try { _M_lock.lock(); } __catch(...) { }
+ else
+ _M_lock.lock();
+ }
+
+ _Unlock(const _Unlock&) = delete;
+ _Unlock& operator=(const _Unlock&) = delete;
+
+ _Lock& _M_lock;
+ };
+
+ public:
+ typedef condition_variable::native_handle_type native_handle_type;
+
+ condition_variable_any() throw ();
+ ~condition_variable_any() throw ();
+
+ condition_variable_any(const condition_variable_any&) = delete;
+ condition_variable_any& operator=(const condition_variable_any&) = delete;
+
+ void
+ notify_one()
+ {
+ lock_guard<mutex> __lock(_M_mutex);
+ _M_cond.notify_one();
+ }
+
+ void
+ notify_all()
+ {
+ lock_guard<mutex> __lock(_M_mutex);
+ _M_cond.notify_all();
+ }
+
+ template<typename _Lock>
+ void
+ wait(_Lock& __lock)
+ {
+ unique_lock<mutex> __my_lock(_M_mutex);
+ _Unlock<_Lock> __unlock(__lock);
+ // _M_mutex must be unlocked before re-locking __lock so move
+ // ownership of _M_mutex lock to an object with shorter lifetime.
+ unique_lock<mutex> __my_lock2(std::move(__my_lock));
+ _M_cond.wait(__my_lock2);
+ }
+
+
+ template<typename _Lock, typename _Predicate>
+ void
+ wait(_Lock& __lock, _Predicate __p)
+ {
+ while (!__p())
+ wait(__lock);
+ }
+
+ template<typename _Lock, typename _Clock, typename _Duration>
+ cv_status
+ wait_until(_Lock& __lock,
+ const chrono::time_point<_Clock, _Duration>& __atime)
+ {
+ unique_lock<mutex> __my_lock(_M_mutex);
+ _Unlock<_Lock> __unlock(__lock);
+ // _M_mutex must be unlocked before re-locking __lock so move
+ // ownership of _M_mutex lock to an object with shorter lifetime.
+ unique_lock<mutex> __my_lock2(std::move(__my_lock));
+ return _M_cond.wait_until(__my_lock2, __atime);
+ }
+
+ template<typename _Lock, typename _Clock,
+ typename _Duration, typename _Predicate>
+ bool
+ wait_until(_Lock& __lock,
+ const chrono::time_point<_Clock, _Duration>& __atime,
+ _Predicate __p)
+ {
+ while (!__p())
+ if (wait_until(__lock, __atime) == cv_status::timeout)
+ return __p();
+ return true;
+ }
+
+ template<typename _Lock, typename _Rep, typename _Period>
+ cv_status
+ wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime)
+ { return wait_until(__lock, __clock_t::now() + __rtime); }
+
+ template<typename _Lock, typename _Rep,
+ typename _Period, typename _Predicate>
+ bool
+ wait_for(_Lock& __lock,
+ const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p)
+ { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
+
+ native_handle_type
+ native_handle()
+ { return _M_cond.native_handle(); }
+ };
+
+ // @} group condition_variables
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif // _GLIBCXX_CONDITION_VARIABLE
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 07:01:18 +0000