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__)
18 #include <sys/sysctl.h>
19 #endif // !__sun__ && !__linux__
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 #warning hardware_concurrency not yet implemented
93 return 0; // Means not computable [thread.thread.static]
94 #endif // defined(CTL_HW) && defined(HW_NCPU)
101 sleep_for(const chrono::nanoseconds& ns)
103 using namespace chrono;
104 if (ns > nanoseconds::zero())
106 seconds s = duration_cast<seconds>(ns);
108 typedef decltype(ts.tv_sec) ts_sec;
109 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
110 if (s.count() < ts_sec_max)
112 ts.tv_sec = static_cast<ts_sec>(s.count());
113 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count());
117 ts.tv_sec = ts_sec_max;
118 ts.tv_nsec = giga::num - 1;
126 __thread_specific_ptr<__thread_struct>&
127 __thread_local_data()
129 static __thread_specific_ptr<__thread_struct> __p;
133 // __thread_struct_imp
136 class _LIBCPP_HIDDEN __hidden_allocator
139 typedef T value_type;
141 T* allocate(size_t __n)
142 {return static_cast<T*>(::operator new(__n * sizeof(T)));}
143 void deallocate(T* __p, size_t) {::operator delete((void*)__p);}
145 size_t max_size() const {return size_t(~0) / sizeof(T);}
148 class _LIBCPP_HIDDEN __thread_struct_imp
150 typedef vector<__assoc_sub_state*,
151 __hidden_allocator<__assoc_sub_state*> > _AsyncStates;
152 typedef vector<pair<condition_variable*, mutex*>,
153 __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify;
155 _AsyncStates async_states_;
158 __thread_struct_imp(const __thread_struct_imp&);
159 __thread_struct_imp& operator=(const __thread_struct_imp&);
161 __thread_struct_imp() {}
162 ~__thread_struct_imp();
164 void notify_all_at_thread_exit(condition_variable* cv, mutex* m);
165 void __make_ready_at_thread_exit(__assoc_sub_state* __s);
168 __thread_struct_imp::~__thread_struct_imp()
170 for (_Notify::iterator i = notify_.begin(), e = notify_.end();
174 i->first->notify_all();
176 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
179 (*i)->__make_ready();
180 (*i)->__release_shared();
185 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
187 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
191 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
193 async_states_.push_back(__s);
199 __thread_struct::__thread_struct()
200 : __p_(new __thread_struct_imp)
204 __thread_struct::~__thread_struct()
210 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
212 __p_->notify_all_at_thread_exit(cv, m);
216 __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s)
218 __p_->__make_ready_at_thread_exit(__s);
221 _LIBCPP_END_NAMESPACE_STD