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 !__sun__ && !__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");
39 #endif // _LIBCPP_NO_EXCEPTIONS
49 ec = pthread_detach(__t_);
53 #ifndef _LIBCPP_NO_EXCEPTIONS
55 throw system_error(error_code(ec, system_category()), "thread::detach failed");
56 #endif // _LIBCPP_NO_EXCEPTIONS
60 thread::hardware_concurrency() _NOEXCEPT
62 #if defined(CTL_HW) && defined(HW_NCPU)
64 int mib[2] = {CTL_HW, HW_NCPU};
65 std::size_t s = sizeof(n);
66 sysctl(mib, 2, &n, &s, 0, 0);
68 #elif defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L) && defined(_SC_NPROCESSORS_ONLN)
69 long result = sysconf(_SC_NPROCESSORS_ONLN);
70 // sysconf returns -1 if the name is invalid, the option does not exist or
71 // does not have a definite limit.
75 #else // defined(CTL_HW) && defined(HW_NCPU)
76 // TODO: grovel through /proc or check cpuid on x86 and similar
77 // instructions on other architectures.
78 return 0; // Means not computable [thread.thread.static]
79 #endif // defined(CTL_HW) && defined(HW_NCPU)
86 sleep_for(const chrono::nanoseconds& ns)
88 using namespace chrono;
89 if (ns > nanoseconds::zero())
91 seconds s = duration_cast<seconds>(ns);
93 typedef decltype(ts.tv_sec) ts_sec;
94 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
95 if (s.count() < ts_sec_max)
97 ts.tv_sec = static_cast<ts_sec>(s.count());
98 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
102 ts.tv_sec = ts_sec_max;
103 ts.tv_nsec = giga::num - 1;
111 __thread_specific_ptr<__thread_struct>&
112 __thread_local_data()
114 static __thread_specific_ptr<__thread_struct> __p;
118 // __thread_struct_imp
121 class _LIBCPP_HIDDEN __hidden_allocator
124 typedef T value_type;
126 T* allocate(size_t __n)
127 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
128 void deallocate(T* __p, size_t) {::operator delete((void*)__p);}
130 size_t max_size() const {return size_t(~0) / sizeof(T);}
133 class _LIBCPP_HIDDEN __thread_struct_imp
135 typedef vector<__assoc_sub_state*,
136 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
137 typedef vector<pair<condition_variable*, mutex*>,
138 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
140 _AsyncStates async_states_;
143 __thread_struct_imp(const __thread_struct_imp&);
144 __thread_struct_imp& operator=(const __thread_struct_imp&);
146 __thread_struct_imp() {}
147 ~__thread_struct_imp();
149 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
150 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
153 __thread_struct_imp::~__thread_struct_imp()
155 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
159 i->first->notify_all();
161 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
164 (*i)->__make_ready();
165 (*i)->__release_shared();
170 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
172 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
176 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
178 async_states_.push_back(__s);
184 __thread_struct::__thread_struct()
185 : __p_(new __thread_struct_imp)
189 __thread_struct::~__thread_struct()
195 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
197 __p_->notify_all_at_thread_exit(cv, m);
201 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
203 __p_->__make_ready_at_thread_exit(__s);
206 _LIBCPP_END_NAMESPACE_STD