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__))
31 #if defined(__NetBSD__)
32 #pragma weak pthread_create // Do not create libpthread dependency
38 _LIBCPP_BEGIN_NAMESPACE_STD
52 ec = __libcpp_thread_join(&__t_);
56 #ifndef _LIBCPP_NO_EXCEPTIONS
58 throw system_error(error_code(ec, system_category()), "thread::join failed");
59 #endif // _LIBCPP_NO_EXCEPTIONS
68 ec = __libcpp_thread_detach(&__t_);
72 #ifndef _LIBCPP_NO_EXCEPTIONS
74 throw system_error(error_code(ec, system_category()), "thread::detach failed");
75 #endif // _LIBCPP_NO_EXCEPTIONS
79 thread::hardware_concurrency() _NOEXCEPT
81 #if defined(CTL_HW) && defined(HW_NCPU)
83 int mib[2] = {CTL_HW, HW_NCPU};
84 std::size_t s = sizeof(n);
85 sysctl(mib, 2, &n, &s, 0, 0);
87 #elif defined(_SC_NPROCESSORS_ONLN)
88 long result = sysconf(_SC_NPROCESSORS_ONLN);
89 // sysconf returns -1 if the name is invalid, the option does not exist or
90 // does not have a definite limit.
91 // if sysconf returns some other negative number, we have no idea
92 // what is going on. Default to something safe.
95 return static_cast<unsigned>(result);
99 return info.dwNumberOfProcessors;
100 #else // defined(CTL_HW) && defined(HW_NCPU)
101 // TODO: grovel through /proc or check cpuid on x86 and similar
102 // instructions on other architectures.
103 # if defined(_MSC_VER) && ! defined(__clang__)
104 _LIBCPP_WARNING("hardware_concurrency not yet implemented")
106 # warning hardware_concurrency not yet implemented
108 return 0; // Means not computable [thread.thread.static]
109 #endif // defined(CTL_HW) && defined(HW_NCPU)
112 namespace this_thread
116 sleep_for(const chrono::nanoseconds& ns)
118 using namespace chrono;
119 if (ns > nanoseconds::zero())
121 seconds s = duration_cast<seconds>(ns);
123 typedef decltype(ts.tv_sec) ts_sec;
124 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
125 if (s.count() < ts_sec_max)
127 ts.tv_sec = static_cast<ts_sec>(s.count());
128 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
132 ts.tv_sec = ts_sec_max;
133 ts.tv_nsec = giga::num - 1;
136 while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
143 __thread_specific_ptr<__thread_struct>&
144 __thread_local_data()
146 static __thread_specific_ptr<__thread_struct> __p;
150 // __thread_struct_imp
153 class _LIBCPP_HIDDEN __hidden_allocator
156 typedef T value_type;
158 T* allocate(size_t __n)
159 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
160 void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));}
162 size_t max_size() const {return size_t(~0) / sizeof(T);}
165 class _LIBCPP_HIDDEN __thread_struct_imp
167 typedef vector<__assoc_sub_state*,
168 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
169 typedef vector<pair<condition_variable*, mutex*>,
170 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
172 _AsyncStates async_states_;
175 __thread_struct_imp(const __thread_struct_imp&);
176 __thread_struct_imp& operator=(const __thread_struct_imp&);
178 __thread_struct_imp() {}
179 ~__thread_struct_imp();
181 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
182 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
185 __thread_struct_imp::~__thread_struct_imp()
187 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
191 i->first->notify_all();
193 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
196 (*i)->__make_ready();
197 (*i)->__release_shared();
202 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
204 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
208 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
210 async_states_.push_back(__s);
216 __thread_struct::__thread_struct()
217 : __p_(new __thread_struct_imp)
221 __thread_struct::~__thread_struct()
227 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
229 __p_->notify_all_at_thread_exit(cv, m);
233 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
235 __p_->__make_ready_at_thread_exit(__s);
238 _LIBCPP_END_NAMESPACE_STD
240 #endif // !_LIBCPP_HAS_NO_THREADS