llvm-project/libcxx/include/__mutex_base

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
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//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MUTEX_BASE
#define _LIBCPP___MUTEX_BASE
#include <__config>
#include <chrono>
#include <system_error>
#include <pthread.h>
#pragma GCC system_header
_LIBCPP_BEGIN_NAMESPACE_STD
class _LIBCPP_VISIBLE mutex
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{
pthread_mutex_t __m_;
public:
_LIBCPP_INLINE_VISIBILITY
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mutex() {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;}
~mutex();
private:
mutex(const mutex&);// = delete;
mutex& operator=(const mutex&);// = delete;
public:
void lock();
bool try_lock();
void unlock();
typedef pthread_mutex_t* native_handle_type;
_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
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};
struct _LIBCPP_VISIBLE defer_lock_t {};
struct _LIBCPP_VISIBLE try_to_lock_t {};
struct _LIBCPP_VISIBLE adopt_lock_t {};
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//constexpr
extern const
defer_lock_t defer_lock;
//constexpr
extern const
try_to_lock_t try_to_lock;
//constexpr
extern const
adopt_lock_t adopt_lock;
template <class _Mutex>
class _LIBCPP_VISIBLE lock_guard
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{
public:
typedef _Mutex mutex_type;
private:
mutex_type& __m_;
public:
_LIBCPP_INLINE_VISIBILITY
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explicit lock_guard(mutex_type& __m)
: __m_(__m) {__m_.lock();}
_LIBCPP_INLINE_VISIBILITY
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lock_guard(mutex_type& __m, adopt_lock_t)
: __m_(__m) {}
_LIBCPP_INLINE_VISIBILITY
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~lock_guard() {__m_.unlock();}
private:
lock_guard(lock_guard const&);// = delete;
lock_guard& operator=(lock_guard const&);// = delete;
};
template <class _Mutex>
class _LIBCPP_VISIBLE unique_lock
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{
public:
typedef _Mutex mutex_type;
private:
mutex_type* __m_;
bool __owns_;
public:
_LIBCPP_INLINE_VISIBILITY
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unique_lock() : __m_(nullptr), __owns_(false) {}
_LIBCPP_INLINE_VISIBILITY
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explicit unique_lock(mutex_type& __m)
: __m_(&__m), __owns_(true) {__m_->lock();}
_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, defer_lock_t)
: __m_(&__m), __owns_(false) {}
_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, try_to_lock_t)
: __m_(&__m), __owns_(__m.try_lock()) {}
_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, adopt_lock_t)
: __m_(&__m), __owns_(true) {}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
: __m_(&__m), __owns_(__m.try_lock_until(__t)) {}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
: __m_(&__m), __owns_(__m.try_lock_for(__d)) {}
_LIBCPP_INLINE_VISIBILITY
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~unique_lock()
{
if (__owns_)
__m_->unlock();
}
private:
unique_lock(unique_lock const&); // = delete;
unique_lock& operator=(unique_lock const&); // = delete;
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
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unique_lock(unique_lock&& __u)
: __m_(__u.__m_), __owns_(__u.__owns_)
{__u.__m_ = nullptr; __u.__owns_ = false;}
_LIBCPP_INLINE_VISIBILITY
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unique_lock& operator=(unique_lock&& __u)
{
if (__owns_)
__m_->unlock();
__m_ = __u.__m_;
__owns_ = __u.__owns_;
__u.__m_ = nullptr;
__u.__owns_ = false;
return *this;
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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void lock();
bool try_lock();
template <class _Rep, class _Period>
bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
template <class _Clock, class _Duration>
bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
void unlock();
_LIBCPP_INLINE_VISIBILITY
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void swap(unique_lock& __u)
{
_STD::swap(__m_, __u.__m_);
_STD::swap(__owns_, __u.__owns_);
}
_LIBCPP_INLINE_VISIBILITY
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mutex_type* release()
{
mutex_type* __m = __m_;
__m_ = nullptr;
__owns_ = false;
return __m;
}
_LIBCPP_INLINE_VISIBILITY
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bool owns_lock() const {return __owns_;}
_LIBCPP_INLINE_VISIBILITY
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// explicit
operator bool () const {return __owns_;}
_LIBCPP_INLINE_VISIBILITY
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mutex_type* mutex() const {return __m_;}
};
template <class _Mutex>
void
unique_lock<_Mutex>::lock()
{
if (__m_ == nullptr)
__throw_system_error(EPERM, "unique_lock::lock: references null mutex");
if (__owns_)
__throw_system_error(EDEADLK, "unique_lock::lock: already locked");
__m_->lock();
__owns_ = true;
}
template <class _Mutex>
bool
unique_lock<_Mutex>::try_lock()
{
if (__m_ == nullptr)
__throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
if (__owns_)
__throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
__owns_ = __m_->try_lock();
return __owns_;
}
template <class _Mutex>
template <class _Rep, class _Period>
bool
unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
{
if (__m_ == nullptr)
__throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
if (__owns_)
__throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
__owns_ = __m_->try_lock_for(__d);
return __owns_;
}
template <class _Mutex>
template <class _Clock, class _Duration>
bool
unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
{
if (__m_ == nullptr)
__throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
if (__owns_)
__throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
__owns_ = __m_->try_lock_until(__t);
return __owns_;
}
template <class _Mutex>
void
unique_lock<_Mutex>::unlock()
{
if (!__owns_)
__throw_system_error(EPERM, "unique_lock::unlock: not locked");
__m_->unlock();
__owns_ = false;
}
template <class _Mutex>
inline _LIBCPP_INLINE_VISIBILITY
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void
swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) {__x.swap(__y);}
struct _LIBCPP_VISIBLE cv_status
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{
enum _ {
no_timeout,
timeout
};
_ __v_;
_LIBCPP_INLINE_VISIBILITY cv_status(_ __v) : __v_(__v) {}
_LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;}
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};
class _LIBCPP_VISIBLE condition_variable
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{
pthread_cond_t __cv_;
public:
_LIBCPP_INLINE_VISIBILITY
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condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;}
~condition_variable();
private:
condition_variable(const condition_variable&); // = delete;
condition_variable& operator=(const condition_variable&); // = delete;
public:
void notify_one();
void notify_all();
void wait(unique_lock<mutex>& __lk);
template <class _Predicate>
void wait(unique_lock<mutex>& __lk, _Predicate __pred);
template <class _Duration>
cv_status
wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<chrono::system_clock, _Duration>& __t);
template <class _Clock, class _Duration>
cv_status
wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<_Clock, _Duration>& __t);
template <class _Clock, class _Duration, class _Predicate>
bool
wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<_Clock, _Duration>& __t,
_Predicate __pred);
template <class _Rep, class _Period>
cv_status
wait_for(unique_lock<mutex>& __lk,
const chrono::duration<_Rep, _Period>& __d);
template <class _Rep, class _Period, class _Predicate>
bool
wait_for(unique_lock<mutex>& __lk,
const chrono::duration<_Rep, _Period>& __d,
_Predicate __pred);
typedef pthread_cond_t* native_handle_type;
_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
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private:
void __do_timed_wait(unique_lock<mutex>& __lk,
chrono::time_point<chrono::system_clock, chrono::nanoseconds>);
};
template <class _To, class _Rep, class _Period>
inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
<
chrono::__is_duration<_To>::value,
_To
>::type
__ceil(chrono::duration<_Rep, _Period> __d)
{
using namespace chrono;
_To __r = duration_cast<_To>(__d);
if (__r < __d)
++__r;
return __r;
}
template <class _Predicate>
void
condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
{
while (!__pred())
wait(__lk);
}
template <class _Duration>
cv_status
condition_variable::wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<chrono::system_clock, _Duration>& __t)
{
using namespace chrono;
typedef time_point<system_clock, nanoseconds> __nano_sys_tmpt;
__do_timed_wait(__lk,
__nano_sys_tmpt(__ceil<nanoseconds>(__t.time_since_epoch())));
return system_clock::now() < __t ? cv_status::no_timeout :
cv_status::timeout;
}
template <class _Clock, class _Duration>
cv_status
condition_variable::wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<_Clock, _Duration>& __t)
{
using namespace chrono;
system_clock::time_point __s_now = system_clock::now();
typename _Clock::time_point __c_now = _Clock::now();
__do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__t - __c_now));
return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
}
template <class _Clock, class _Duration, class _Predicate>
bool
condition_variable::wait_until(unique_lock<mutex>& __lk,
const chrono::time_point<_Clock, _Duration>& __t,
_Predicate __pred)
{
while (!__pred())
{
if (wait_until(__lk, __t) == cv_status::timeout)
return __pred();
}
return true;
}
template <class _Rep, class _Period>
cv_status
condition_variable::wait_for(unique_lock<mutex>& __lk,
const chrono::duration<_Rep, _Period>& __d)
{
using namespace chrono;
system_clock::time_point __s_now = system_clock::now();
monotonic_clock::time_point __c_now = monotonic_clock::now();
__do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d));
return monotonic_clock::now() - __c_now < __d ? cv_status::no_timeout :
cv_status::timeout;
}
template <class _Rep, class _Period, class _Predicate>
inline _LIBCPP_INLINE_VISIBILITY
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bool
condition_variable::wait_for(unique_lock<mutex>& __lk,
const chrono::duration<_Rep, _Period>& __d,
_Predicate __pred)
{
return wait_until(__lk, chrono::monotonic_clock::now() + __d,
_STD::move(__pred));
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___MUTEX_BASE