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(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__)
21 # include <sys/sysctl.h>
22 # endif // !defined(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__)
26 #if defined(__NetBSD__)
27 #pragma weak pthread_create // Do not create libpthread dependency
33 _LIBCPP_BEGIN_NAMESPACE_STD
44 int ec = pthread_join(__t_, 0);
45 #ifndef _LIBCPP_NO_EXCEPTIONS
47 throw system_error(error_code(ec, system_category()), "thread::join failed");
50 #endif // _LIBCPP_NO_EXCEPTIONS
60 ec = pthread_detach(__t_);
64 #ifndef _LIBCPP_NO_EXCEPTIONS
66 throw system_error(error_code(ec, system_category()), "thread::detach failed");
67 #endif // _LIBCPP_NO_EXCEPTIONS
71 thread::hardware_concurrency() _NOEXCEPT
73 #if defined(CTL_HW) && defined(HW_NCPU)
75 int mib[2] = {CTL_HW, HW_NCPU};
76 std::size_t s = sizeof(n);
77 sysctl(mib, 2, &n, &s, 0, 0);
79 #elif defined(_SC_NPROCESSORS_ONLN)
80 long result = sysconf(_SC_NPROCESSORS_ONLN);
81 // sysconf returns -1 if the name is invalid, the option does not exist or
82 // does not have a definite limit.
83 // if sysconf returns some other negative number, we have no idea
84 // what is going on. Default to something safe.
87 return static_cast<unsigned>(result);
91 return info.dwNumberOfProcessors;
92 #else // defined(CTL_HW) && defined(HW_NCPU)
93 // TODO: grovel through /proc or check cpuid on x86 and similar
94 // instructions on other architectures.
95 # if defined(_MSC_VER) && ! defined(__clang__)
96 _LIBCPP_WARNING("hardware_concurrency not yet implemented")
98 # warning hardware_concurrency not yet implemented
100 return 0; // Means not computable [thread.thread.static]
101 #endif // defined(CTL_HW) && defined(HW_NCPU)
104 namespace this_thread
108 sleep_for(const chrono::nanoseconds& ns)
110 using namespace chrono;
111 if (ns > nanoseconds::zero())
113 seconds s = duration_cast<seconds>(ns);
115 typedef decltype(ts.tv_sec) ts_sec;
116 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
117 if (s.count() < ts_sec_max)
119 ts.tv_sec = static_cast<ts_sec>(s.count());
120 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
124 ts.tv_sec = ts_sec_max;
125 ts.tv_nsec = giga::num - 1;
128 while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
135 __thread_specific_ptr<__thread_struct>&
136 __thread_local_data()
138 static __thread_specific_ptr<__thread_struct> __p;
142 // __thread_struct_imp
145 class _LIBCPP_HIDDEN __hidden_allocator
148 typedef T value_type;
150 T* allocate(size_t __n)
151 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
152 void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));}
154 size_t max_size() const {return size_t(~0) / sizeof(T);}
157 class _LIBCPP_HIDDEN __thread_struct_imp
159 typedef vector<__assoc_sub_state*,
160 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
161 typedef vector<pair<condition_variable*, mutex*>,
162 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
164 _AsyncStates async_states_;
167 __thread_struct_imp(const __thread_struct_imp&);
168 __thread_struct_imp& operator=(const __thread_struct_imp&);
170 __thread_struct_imp() {}
171 ~__thread_struct_imp();
173 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
174 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
177 __thread_struct_imp::~__thread_struct_imp()
179 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
183 i->first->notify_all();
185 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
188 (*i)->__make_ready();
189 (*i)->__release_shared();
194 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
196 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
200 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
202 async_states_.push_back(__s);
208 __thread_struct::__thread_struct()
209 : __p_(new __thread_struct_imp)
213 __thread_struct::~__thread_struct()
219 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
221 __p_->notify_all_at_thread_exit(cv, m);
225 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
227 __p_->__make_ready_at_thread_exit(__s);
230 _LIBCPP_END_NAMESPACE_STD
232 #endif // !_LIBCPP_HAS_NO_THREADS