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__) && !defined(_AIX)
18 #include <sys/sysctl.h>
19 #endif // !__sun__ && !__linux__ && !_AIX
23 #if defined(__NetBSD__)
24 #pragma weak pthread_create // Do not create libpthread dependency
30 _LIBCPP_BEGIN_NAMESPACE_STD
41 int ec = pthread_join(__t_, 0);
42 #ifndef _LIBCPP_NO_EXCEPTIONS
44 throw system_error(error_code(ec, system_category()), "thread::join failed");
47 #endif // _LIBCPP_NO_EXCEPTIONS
57 ec = pthread_detach(__t_);
61 #ifndef _LIBCPP_NO_EXCEPTIONS
63 throw system_error(error_code(ec, system_category()), "thread::detach failed");
64 #endif // _LIBCPP_NO_EXCEPTIONS
68 thread::hardware_concurrency() _NOEXCEPT
70 #if defined(CTL_HW) && defined(HW_NCPU)
72 int mib[2] = {CTL_HW, HW_NCPU};
73 std::size_t s = sizeof(n);
74 sysctl(mib, 2, &n, &s, 0, 0);
76 #elif defined(_SC_NPROCESSORS_ONLN)
77 long result = sysconf(_SC_NPROCESSORS_ONLN);
78 // sysconf returns -1 if the name is invalid, the option does not exist or
79 // does not have a definite limit.
80 // if sysconf returns some other negative number, we have no idea
81 // what is going on. Default to something safe.
84 return static_cast<unsigned>(result);
88 return info.dwNumberOfProcessors;
89 #else // defined(CTL_HW) && defined(HW_NCPU)
90 // TODO: grovel through /proc or check cpuid on x86 and similar
91 // instructions on other architectures.
92 # if defined(_MSC_VER) && ! defined(__clang__)
93 _LIBCPP_WARNING("hardware_concurrency not yet implemented")
95 # warning hardware_concurrency not yet implemented
97 return 0; // Means not computable [thread.thread.static]
98 #endif // defined(CTL_HW) && defined(HW_NCPU)
101 namespace this_thread
105 sleep_for(const chrono::nanoseconds& ns)
107 using namespace chrono;
108 if (ns > nanoseconds::zero())
110 seconds s = duration_cast<seconds>(ns);
112 typedef decltype(ts.tv_sec) ts_sec;
113 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
114 if (s.count() < ts_sec_max)
116 ts.tv_sec = static_cast<ts_sec>(s.count());
117 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
121 ts.tv_sec = ts_sec_max;
122 ts.tv_nsec = giga::num - 1;
125 while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
132 __thread_specific_ptr<__thread_struct>&
133 __thread_local_data()
135 static __thread_specific_ptr<__thread_struct> __p;
139 // __thread_struct_imp
142 class _LIBCPP_HIDDEN __hidden_allocator
145 typedef T value_type;
147 T* allocate(size_t __n)
148 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
149 void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));}
151 size_t max_size() const {return size_t(~0) / sizeof(T);}
154 class _LIBCPP_HIDDEN __thread_struct_imp
156 typedef vector<__assoc_sub_state*,
157 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
158 typedef vector<pair<condition_variable*, mutex*>,
159 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
161 _AsyncStates async_states_;
164 __thread_struct_imp(const __thread_struct_imp&);
165 __thread_struct_imp& operator=(const __thread_struct_imp&);
167 __thread_struct_imp() {}
168 ~__thread_struct_imp();
170 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
171 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
174 __thread_struct_imp::~__thread_struct_imp()
176 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
180 i->first->notify_all();
182 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
185 (*i)->__make_ready();
186 (*i)->__release_shared();
191 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
193 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
197 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
199 async_states_.push_back(__s);
205 __thread_struct::__thread_struct()
206 : __p_(new __thread_struct_imp)
210 __thread_struct::~__thread_struct()
216 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
218 __p_->notify_all_at_thread_exit(cv, m);
222 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
224 __p_->__make_ready_at_thread_exit(__s);
227 _LIBCPP_END_NAMESPACE_STD