1 //===------------------------- thread.cpp----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
15 #include <sys/types.h>
17 #if !defined(__sun__) && !defined(__linux__)
18 #include <sys/sysctl.h>
21 #endif // !__sun__ && !__linux__
24 _LIBCPP_BEGIN_NAMESPACE_STD
35 int ec = pthread_join(__t_, 0);
36 #ifndef _LIBCPP_NO_EXCEPTIONS
38 throw system_error(error_code(ec, system_category()), "thread::join failed");
41 #endif // _LIBCPP_NO_EXCEPTIONS
51 ec = pthread_detach(__t_);
55 #ifndef _LIBCPP_NO_EXCEPTIONS
57 throw system_error(error_code(ec, system_category()), "thread::detach failed");
58 #endif // _LIBCPP_NO_EXCEPTIONS
62 thread::hardware_concurrency() _NOEXCEPT
64 #if defined(CTL_HW) && defined(HW_NCPU)
66 int mib[2] = {CTL_HW, HW_NCPU};
67 std::size_t s = sizeof(n);
68 sysctl(mib, 2, &n, &s, 0, 0);
70 #elif (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L) && defined(_SC_NPROCESSORS_ONLN)) || defined(EMSCRIPTEN)
71 long result = sysconf(_SC_NPROCESSORS_ONLN);
72 // sysconf returns -1 if the name is invalid, the option does not exist or
73 // does not have a definite limit.
74 // if sysconf returns some other negative number, we have no idea
75 // what is going on. Default to something safe.
78 return static_cast<unsigned>(result);
79 #else // defined(CTL_HW) && defined(HW_NCPU)
80 // TODO: grovel through /proc or check cpuid on x86 and similar
81 // instructions on other architectures.
82 return 0; // Means not computable [thread.thread.static]
83 #endif // defined(CTL_HW) && defined(HW_NCPU)
90 sleep_for(const chrono::nanoseconds& ns)
92 using namespace chrono;
93 if (ns > nanoseconds::zero())
95 seconds s = duration_cast<seconds>(ns);
97 typedef decltype(ts.tv_sec) ts_sec;
98 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
99 if (s.count() < ts_sec_max)
101 ts.tv_sec = static_cast<ts_sec>(s.count());
102 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
106 ts.tv_sec = ts_sec_max;
107 ts.tv_nsec = giga::num - 1;
115 __thread_specific_ptr<__thread_struct>&
116 __thread_local_data()
118 static __thread_specific_ptr<__thread_struct> __p;
122 // __thread_struct_imp
125 class _LIBCPP_HIDDEN __hidden_allocator
128 typedef T value_type;
130 T* allocate(size_t __n)
131 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
132 void deallocate(T* __p, size_t) {::operator delete((void*)__p);}
134 size_t max_size() const {return size_t(~0) / sizeof(T);}
137 class _LIBCPP_HIDDEN __thread_struct_imp
139 typedef vector<__assoc_sub_state*,
140 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
141 typedef vector<pair<condition_variable*, mutex*>,
142 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
144 _AsyncStates async_states_;
147 __thread_struct_imp(const __thread_struct_imp&);
148 __thread_struct_imp& operator=(const __thread_struct_imp&);
150 __thread_struct_imp() {}
151 ~__thread_struct_imp();
153 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
154 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
157 __thread_struct_imp::~__thread_struct_imp()
159 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
163 i->first->notify_all();
165 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
168 (*i)->__make_ready();
169 (*i)->__release_shared();
174 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
176 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
180 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
182 async_states_.push_back(__s);
188 __thread_struct::__thread_struct()
189 : __p_(new __thread_struct_imp)
193 __thread_struct::~__thread_struct()
199 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
201 __p_->notify_all_at_thread_exit(cv, m);
205 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
207 __p_->__make_ready_at_thread_exit(__s);
210 _LIBCPP_END_NAMESPACE_STD