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//===------------------------- thread.cpp----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "__config"
#ifndef _LIBCPP_HAS_NO_THREADS
#include "thread"
#include "exception"
#include "vector"
#include "future"
#include "limits"
#include <sys/types.h>
#if !defined(_WIN32)
# if !defined(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__)
# include <sys/sysctl.h>
# endif // !defined(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__)
# include <unistd.h>
#endif // !_WIN32
#if defined(__NetBSD__)
#pragma weak pthread_create // Do not create libpthread dependency
#endif
#if defined(_WIN32)
#include <windows.h>
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
thread::~thread()
{
if (__t_ != 0)
terminate();
}
void
thread::join()
{
int ec = pthread_join(__t_, 0);
#ifndef _LIBCPP_NO_EXCEPTIONS
if (ec)
throw system_error(error_code(ec, system_category()), "thread::join failed");
#else
(void)ec;
#endif // _LIBCPP_NO_EXCEPTIONS
__t_ = 0;
}
void
thread::detach()
{
int ec = EINVAL;
if (__t_ != 0)
{
ec = pthread_detach(__t_);
if (ec == 0)
__t_ = 0;
}
#ifndef _LIBCPP_NO_EXCEPTIONS
if (ec)
throw system_error(error_code(ec, system_category()), "thread::detach failed");
#endif // _LIBCPP_NO_EXCEPTIONS
}
unsigned
thread::hardware_concurrency() _NOEXCEPT
{
#if defined(CTL_HW) && defined(HW_NCPU)
unsigned n;
int mib[2] = {CTL_HW, HW_NCPU};
std::size_t s = sizeof(n);
sysctl(mib, 2, &n, &s, 0, 0);
return n;
#elif defined(_SC_NPROCESSORS_ONLN)
long result = sysconf(_SC_NPROCESSORS_ONLN);
// sysconf returns -1 if the name is invalid, the option does not exist or
// does not have a definite limit.
// if sysconf returns some other negative number, we have no idea
// what is going on. Default to something safe.
if (result < 0)
return 0;
return static_cast<unsigned>(result);
#elif defined(_WIN32)
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwNumberOfProcessors;
#else // defined(CTL_HW) && defined(HW_NCPU)
// TODO: grovel through /proc or check cpuid on x86 and similar
// instructions on other architectures.
# if defined(_MSC_VER) && ! defined(__clang__)
_LIBCPP_WARNING("hardware_concurrency not yet implemented")
# else
# warning hardware_concurrency not yet implemented
# endif
return 0; // Means not computable [thread.thread.static]
#endif // defined(CTL_HW) && defined(HW_NCPU)
}
namespace this_thread
{
void
sleep_for(const chrono::nanoseconds& ns)
{
using namespace chrono;
if (ns > nanoseconds::zero())
{
seconds s = duration_cast<seconds>(ns);
timespec ts;
typedef decltype(ts.tv_sec) ts_sec;
_LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
if (s.count() < ts_sec_max)
{
ts.tv_sec = static_cast<ts_sec>(s.count());
ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
}
else
{
ts.tv_sec = ts_sec_max;
ts.tv_nsec = giga::num - 1;
}
while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
;
}
}
} // this_thread
__thread_specific_ptr<__thread_struct>&
__thread_local_data()
{
static __thread_specific_ptr<__thread_struct> __p;
return __p;
}
// __thread_struct_imp
template <class T>
class _LIBCPP_HIDDEN __hidden_allocator
{
public:
typedef T value_type;
T* allocate(size_t __n)
{return static_cast<T*>(::operator new(__n * sizeof(T)));}
void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));}
size_t max_size() const {return size_t(~0) / sizeof(T);}
};
class _LIBCPP_HIDDEN __thread_struct_imp
{
typedef vector<__assoc_sub_state*,
__hidden_allocator<__assoc_sub_state*> > _AsyncStates;
typedef vector<pair<condition_variable*, mutex*>,
__hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
_AsyncStates async_states_;
_Notify notify_;
__thread_struct_imp(const __thread_struct_imp&);
__thread_struct_imp& operator=(const __thread_struct_imp&);
public:
__thread_struct_imp() {}
~__thread_struct_imp();
void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
void __make_ready_at_thread_exit(__assoc_sub_state* __s);
};
__thread_struct_imp::~__thread_struct_imp()
{
for (_Notify::iterator i = notify_.begin(), e = notify_.end();
i != e; ++i)
{
i->second->unlock();
i->first->notify_all();
}
for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
i != e; ++i)
{
(*i)->__make_ready();
(*i)->__release_shared();
}
}
void
__thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
{
notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
}
void
__thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
{
async_states_.push_back(__s);
__s->__add_shared();
}
// __thread_struct
__thread_struct::__thread_struct()
: __p_(new __thread_struct_imp)
{
}
__thread_struct::~__thread_struct()
{
delete __p_;
}
void
__thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
{
__p_->notify_all_at_thread_exit(cv, m);
}
void
__thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
{
__p_->__make_ready_at_thread_exit(__s);
}
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
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