Remove building with NOCRYPTO option
[minix.git] / external / bsd / libc++ / dist / libcxx / src / thread.cpp
blob349605c23adf4cb3939819a054f82397d53b8c0b
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 //===----------------------------------------------------------------------===//
10 #include "__config"
11 #ifndef _LIBCPP_HAS_NO_THREADS
13 #include "thread"
14 #include "exception"
15 #include "vector"
16 #include "future"
17 #include "limits"
18 #include <sys/types.h>
19 #if !defined(_WIN32)
20 # if !defined(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__) && !defined(__CloudABI__)
21 # include <sys/sysctl.h>
22 # endif // !defined(__sun__) && !defined(__linux__) && !defined(_AIX) && !defined(__native_client__) && !defined(__CloudABI__)
23 # include <unistd.h>
24 #endif // !_WIN32
26 #if defined(__NetBSD__) || defined(__minix)
27 #pragma weak pthread_create // Do not create libpthread dependency
28 #endif
29 #if defined(_WIN32)
30 #include <windows.h>
31 #endif
33 _LIBCPP_BEGIN_NAMESPACE_STD
35 thread::~thread()
37 if (__t_ != 0)
38 terminate();
41 void
42 thread::join()
44 int ec = pthread_join(__t_, 0);
45 #ifndef _LIBCPP_NO_EXCEPTIONS
46 if (ec)
47 throw system_error(error_code(ec, system_category()), "thread::join failed");
48 #else
49 (void)ec;
50 #endif // _LIBCPP_NO_EXCEPTIONS
51 __t_ = 0;
54 void
55 thread::detach()
57 int ec = EINVAL;
58 if (__t_ != 0)
60 ec = pthread_detach(__t_);
61 if (ec == 0)
62 __t_ = 0;
64 #ifndef _LIBCPP_NO_EXCEPTIONS
65 if (ec)
66 throw system_error(error_code(ec, system_category()), "thread::detach failed");
67 #endif // _LIBCPP_NO_EXCEPTIONS
70 unsigned
71 thread::hardware_concurrency() _NOEXCEPT
73 #if defined(CTL_HW) && defined(HW_NCPU)
74 unsigned n;
75 int mib[2] = {CTL_HW, HW_NCPU};
76 std::size_t s = sizeof(n);
77 sysctl(mib, 2, &n, &s, 0, 0);
78 return n;
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.
85 if (result < 0)
86 return 0;
87 return static_cast<unsigned>(result);
88 #elif defined(_WIN32)
89 SYSTEM_INFO info;
90 GetSystemInfo(&info);
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")
97 # else
98 # warning hardware_concurrency not yet implemented
99 # endif
100 return 0; // Means not computable [thread.thread.static]
101 #endif // defined(CTL_HW) && defined(HW_NCPU)
104 namespace this_thread
107 void
108 sleep_for(const chrono::nanoseconds& ns)
110 using namespace chrono;
111 if (ns > nanoseconds::zero())
113 seconds s = duration_cast<seconds>(ns);
114 timespec ts;
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());
122 else
124 ts.tv_sec = ts_sec_max;
125 ts.tv_nsec = giga::num - 1;
128 while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
133 } // this_thread
135 __thread_specific_ptr<__thread_struct>&
136 __thread_local_data()
138 static __thread_specific_ptr<__thread_struct> __p;
139 return __p;
142 // __thread_struct_imp
144 template <class T>
145 class _LIBCPP_HIDDEN __hidden_allocator
147 public:
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_;
165 _Notify notify_;
167 __thread_struct_imp(const __thread_struct_imp&);
168 __thread_struct_imp& operator=(const __thread_struct_imp&);
169 public:
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();
180 i != e; ++i)
182 i->second->unlock();
183 i->first->notify_all();
185 for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
186 i != e; ++i)
188 (*i)->__make_ready();
189 (*i)->__release_shared();
193 void
194 __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
196 notify_.push_back(pair<condition_variable*, mutex*>(cv, m));
199 void
200 __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s)
202 async_states_.push_back(__s);
203 __s->__add_shared();
206 // __thread_struct
208 __thread_struct::__thread_struct()
209 : __p_(new __thread_struct_imp)
213 __thread_struct::~__thread_struct()
215 delete __p_;
218 void
219 __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m)
221 __p_->notify_all_at_thread_exit(cv, m);
224 void
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