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 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_HAS_NO_THREADS
18 #include <sys/types.h>
20 #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
21 # include <sys/param.h>
23 # include <sys/sysctl.h>
24 # endif // defined(BSD)
25 #endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
27 #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__CloudABI__) || defined(__Fuchsia__)
29 #endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__CloudABI__) || defined(__Fuchsia__)
31 #if defined(__NetBSD__)
32 #pragma weak pthread_create // Do not create libpthread dependency
35 #if defined(_LIBCPP_WIN32API)
39 _LIBCPP_BEGIN_NAMESPACE_STD
43 if (!__libcpp_thread_isnull(&__t_))
51 if (!__libcpp_thread_isnull(&__t_))
53 ec = __libcpp_thread_join(&__t_);
55 __t_ = _LIBCPP_NULL_THREAD;
59 __throw_system_error(ec, "thread::join failed");
66 if (!__libcpp_thread_isnull(&__t_))
68 ec = __libcpp_thread_detach(&__t_);
70 __t_ = _LIBCPP_NULL_THREAD;
74 __throw_system_error(ec, "thread::detach failed");
78 thread::hardware_concurrency() _NOEXCEPT
80 #if defined(CTL_HW) && defined(HW_NCPU)
82 int mib[2] = {CTL_HW, HW_NCPU};
83 std::size_t s = sizeof(n);
84 sysctl(mib, 2, &n, &s, 0, 0);
86 #elif defined(_SC_NPROCESSORS_ONLN)
87 long result = sysconf(_SC_NPROCESSORS_ONLN);
88 // sysconf returns -1 if the name is invalid, the option does not exist or
89 // does not have a definite limit.
90 // if sysconf returns some other negative number, we have no idea
91 // what is going on. Default to something safe.
94 return static_cast<unsigned>(result);
95 #elif defined(_LIBCPP_WIN32API)
98 return info.dwNumberOfProcessors;
99 #else // defined(CTL_HW) && defined(HW_NCPU)
100 // TODO: grovel through /proc or check cpuid on x86 and similar
101 // instructions on other architectures.
102 # if defined(_LIBCPP_WARNING)
103 _LIBCPP_WARNING("hardware_concurrency not yet implemented")
105 # warning hardware_concurrency not yet implemented
107 return 0; // Means not computable [thread.thread.static]
108 #endif // defined(CTL_HW) && defined(HW_NCPU)
111 namespace this_thread
115 sleep_for(const chrono::nanoseconds& ns)
117 if (ns > chrono::nanoseconds::zero())
119 __libcpp_thread_sleep_for(ns);
125 __thread_specific_ptr<__thread_struct>&
126 __thread_local_data()
128 static __thread_specific_ptr<__thread_struct> __p;
132 // __thread_struct_imp
135 class _LIBCPP_HIDDEN __hidden_allocator
138 typedef T value_type;
140 T* allocate(size_t __n)
141 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
142 void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));}
144 size_t max_size() const {return size_t(~0) / sizeof(T);}
147 class _LIBCPP_HIDDEN __thread_struct_imp
149 typedef vector<__assoc_sub_state*,
150 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
151 typedef vector<pair<condition_variable*, mutex*>,
152 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
154 _AsyncStates async_states_;
157 __thread_struct_imp(const __thread_struct_imp&);
158 __thread_struct_imp& operator=(const __thread_struct_imp&);
160 __thread_struct_imp() {}
161 ~__thread_struct_imp();
163 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
164 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
167 __thread_struct_imp::~__thread_struct_imp()
169 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
173 i->first->notify_all();
175 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
178 (*i)->__make_ready();
179 (*i)->__release_shared();
184 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
186 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
190 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
192 async_states_.push_back(__s);
198 __thread_struct::__thread_struct()
199 : __p_(new __thread_struct_imp)
203 __thread_struct::~__thread_struct()
209 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
211 __p_->notify_all_at_thread_exit(cv, m);
215 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
217 __p_->__make_ready_at_thread_exit(__s);
220 _LIBCPP_END_NAMESPACE_STD
222 #endif // !_LIBCPP_HAS_NO_THREADS