1 //===------------------------- thread.cpp----------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "__config" 11 #ifndef _LIBCPP_HAS_NO_THREADS 12 13 #include "thread" 14 #include "exception" 15 #include "vector" 16 #include "future" 17 #include "limits" 18 #include <sys/types.h> 19 20 #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) 21 # include <sys/param.h> 22 # if defined(BSD) 23 # include <sys/sysctl.h> 24 # endif // defined(BSD) 25 #endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) 26 27 #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__CloudABI__) || defined(__Fuchsia__) 28 # include <unistd.h> 29 #endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__CloudABI__) || defined(__Fuchsia__) 30 31 #if defined(__NetBSD__) 32 #pragma weak pthread_create // Do not create libpthread dependency 33 #endif 34 35 #if defined(_LIBCPP_WIN32API) 36 #include <windows.h> 37 #endif 38 39 _LIBCPP_BEGIN_NAMESPACE_STD 40 41 thread::~thread() 42 { 43 if (!__libcpp_thread_isnull(&__t_)) 44 terminate(); 45 } 46 47 void 48 thread::join() 49 { 50 int ec = EINVAL; 51 if (!__libcpp_thread_isnull(&__t_)) 52 { 53 ec = __libcpp_thread_join(&__t_); 54 if (ec == 0) 55 __t_ = _LIBCPP_NULL_THREAD; 56 } 57 58 if (ec) 59 __throw_system_error(ec, "thread::join failed"); 60 } 61 62 void 63 thread::detach() 64 { 65 int ec = EINVAL; 66 if (!__libcpp_thread_isnull(&__t_)) 67 { 68 ec = __libcpp_thread_detach(&__t_); 69 if (ec == 0) 70 __t_ = _LIBCPP_NULL_THREAD; 71 } 72 73 if (ec) 74 __throw_system_error(ec, "thread::detach failed"); 75 } 76 77 unsigned 78 thread::hardware_concurrency() _NOEXCEPT 79 { 80 #if defined(CTL_HW) && defined(HW_NCPU) 81 unsigned n; 82 int mib[2] = {CTL_HW, HW_NCPU}; 83 std::size_t s = sizeof(n); 84 sysctl(mib, 2, &n, &s, 0, 0); 85 return n; 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. 92 if (result < 0) 93 return 0; 94 return static_cast<unsigned>(result); 95 #elif defined(_LIBCPP_WIN32API) 96 SYSTEM_INFO info; 97 GetSystemInfo(&info); 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") 104 # else 105 # warning hardware_concurrency not yet implemented 106 # endif 107 return 0; // Means not computable [thread.thread.static] 108 #endif // defined(CTL_HW) && defined(HW_NCPU) 109 } 110 111 namespace this_thread 112 { 113 114 void 115 sleep_for(const chrono::nanoseconds& ns) 116 { 117 if (ns > chrono::nanoseconds::zero()) 118 { 119 __libcpp_thread_sleep_for(ns); 120 } 121 } 122 123 } // this_thread 124 125 __thread_specific_ptr<__thread_struct>& 126 __thread_local_data() 127 { 128 static __thread_specific_ptr<__thread_struct> __p; 129 return __p; 130 } 131 132 // __thread_struct_imp 133 134 template <class T> 135 class _LIBCPP_HIDDEN __hidden_allocator 136 { 137 public: 138 typedef T value_type; 139 140 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));} 143 144 size_t max_size() const {return size_t(~0) / sizeof(T);} 145 }; 146 147 class _LIBCPP_HIDDEN __thread_struct_imp 148 { 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; 153 154 _AsyncStates async_states_; 155 _Notify notify_; 156 157 __thread_struct_imp(const __thread_struct_imp&); 158 __thread_struct_imp& operator=(const __thread_struct_imp&); 159 public: 160 __thread_struct_imp() {} 161 ~__thread_struct_imp(); 162 163 void notify_all_at_thread_exit(condition_variable* cv, mutex* m); 164 void __make_ready_at_thread_exit(__assoc_sub_state* __s); 165 }; 166 167 __thread_struct_imp::~__thread_struct_imp() 168 { 169 for (_Notify::iterator i = notify_.begin(), e = notify_.end(); 170 i != e; ++i) 171 { 172 i->second->unlock(); 173 i->first->notify_all(); 174 } 175 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end(); 176 i != e; ++i) 177 { 178 (*i)->__make_ready(); 179 (*i)->__release_shared(); 180 } 181 } 182 183 void 184 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m) 185 { 186 notify_.push_back(pair<condition_variable*, mutex*>(cv, m)); 187 } 188 189 void 190 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s) 191 { 192 async_states_.push_back(__s); 193 __s->__add_shared(); 194 } 195 196 // __thread_struct 197 198 __thread_struct::__thread_struct() 199 : __p_(new __thread_struct_imp) 200 { 201 } 202 203 __thread_struct::~__thread_struct() 204 { 205 delete __p_; 206 } 207 208 void 209 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m) 210 { 211 __p_->notify_all_at_thread_exit(cv, m); 212 } 213 214 void 215 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s) 216 { 217 __p_->__make_ready_at_thread_exit(__s); 218 } 219 220 _LIBCPP_END_NAMESPACE_STD 221 222 #endif // !_LIBCPP_HAS_NO_THREADS 223
