Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 1 | //===------------------------- thread.cpp----------------------------------===// |
| 2 | // |
Howard Hinnant | f5256e1 | 2010-05-11 21:36:01 +0000 | [diff] [blame] | 3 | // The LLVM Compiler Infrastructure |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 4 | // |
Howard Hinnant | b64f8b0 | 2010-11-16 22:09:02 +0000 | [diff] [blame] | 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
Jonathan Roelofs | 8d86b2e | 2014-09-05 19:45:05 +0000 | [diff] [blame] | 10 | #include "__config" |
| 11 | #ifndef _LIBCPP_HAS_NO_THREADS |
| 12 | |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 13 | #include "thread" |
| 14 | #include "exception" |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 15 | #include "vector" |
| 16 | #include "future" |
Howard Hinnant | cf115d2 | 2012-08-30 19:14:33 +0000 | [diff] [blame] | 17 | #include "limits" |
Howard Hinnant | 0bfe880 | 2010-05-25 17:25:25 +0000 | [diff] [blame] | 18 | #include <sys/types.h> |
Ben Craig | 8057a58 | 2016-01-29 13:53:23 +0000 | [diff] [blame] | 19 | |
| 20 | #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) |
| 21 | # include <sys/param.h> |
| 22 | # if defined(BSD) |
JF Bastien | 93cfd7f | 2014-12-02 17:30:19 +0000 | [diff] [blame] | 23 | # include <sys/sysctl.h> |
Ben Craig | 8057a58 | 2016-01-29 13:53:23 +0000 | [diff] [blame] | 24 | # endif // defined(BSD) |
| 25 | #endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) |
| 26 | |
| 27 | #if !defined(_WIN32) |
JF Bastien | 93cfd7f | 2014-12-02 17:30:19 +0000 | [diff] [blame] | 28 | # include <unistd.h> |
Howard Hinnant | 403f91a | 2012-08-02 18:17:49 +0000 | [diff] [blame] | 29 | #endif // !_WIN32 |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 30 | |
Joerg Sonnenberger | 6744403 | 2013-05-17 21:16:18 +0000 | [diff] [blame] | 31 | #if defined(__NetBSD__) |
| 32 | #pragma weak pthread_create // Do not create libpthread dependency |
| 33 | #endif |
Howard Hinnant | 725ae71 | 2013-07-02 17:53:48 +0000 | [diff] [blame] | 34 | #if defined(_WIN32) |
| 35 | #include <windows.h> |
| 36 | #endif |
Joerg Sonnenberger | 6744403 | 2013-05-17 21:16:18 +0000 | [diff] [blame] | 37 | |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 38 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 39 | |
| 40 | thread::~thread() |
| 41 | { |
Howard Hinnant | adff489 | 2010-05-24 17:49:41 +0000 | [diff] [blame] | 42 | if (__t_ != 0) |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 43 | terminate(); |
| 44 | } |
| 45 | |
| 46 | void |
| 47 | thread::join() |
| 48 | { |
Asiri Rathnayake | 35ff03b | 2016-05-06 14:06:29 +0000 | [diff] [blame^] | 49 | int ec = __libcpp_thread_join(&__t_); |
Howard Hinnant | d444470 | 2010-08-11 17:04:31 +0000 | [diff] [blame] | 50 | #ifndef _LIBCPP_NO_EXCEPTIONS |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 51 | if (ec) |
| 52 | throw system_error(error_code(ec, system_category()), "thread::join failed"); |
Howard Hinnant | db4d478 | 2013-03-28 18:56:26 +0000 | [diff] [blame] | 53 | #else |
| 54 | (void)ec; |
Howard Hinnant | 16e6e1d | 2010-08-22 00:03:27 +0000 | [diff] [blame] | 55 | #endif // _LIBCPP_NO_EXCEPTIONS |
Howard Hinnant | adff489 | 2010-05-24 17:49:41 +0000 | [diff] [blame] | 56 | __t_ = 0; |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | void |
| 60 | thread::detach() |
| 61 | { |
| 62 | int ec = EINVAL; |
| 63 | if (__t_ != 0) |
| 64 | { |
Asiri Rathnayake | 35ff03b | 2016-05-06 14:06:29 +0000 | [diff] [blame^] | 65 | ec = __libcpp_thread_detach(&__t_); |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 66 | if (ec == 0) |
| 67 | __t_ = 0; |
| 68 | } |
Howard Hinnant | d444470 | 2010-08-11 17:04:31 +0000 | [diff] [blame] | 69 | #ifndef _LIBCPP_NO_EXCEPTIONS |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 70 | if (ec) |
| 71 | throw system_error(error_code(ec, system_category()), "thread::detach failed"); |
Howard Hinnant | 16e6e1d | 2010-08-22 00:03:27 +0000 | [diff] [blame] | 72 | #endif // _LIBCPP_NO_EXCEPTIONS |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | unsigned |
Howard Hinnant | 6e1d851 | 2012-07-21 16:50:47 +0000 | [diff] [blame] | 76 | thread::hardware_concurrency() _NOEXCEPT |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 77 | { |
Howard Hinnant | adff489 | 2010-05-24 17:49:41 +0000 | [diff] [blame] | 78 | #if defined(CTL_HW) && defined(HW_NCPU) |
Howard Hinnant | ec3773c | 2011-12-01 20:21:04 +0000 | [diff] [blame] | 79 | unsigned n; |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 80 | int mib[2] = {CTL_HW, HW_NCPU}; |
| 81 | std::size_t s = sizeof(n); |
| 82 | sysctl(mib, 2, &n, &s, 0, 0); |
| 83 | return n; |
Howard Hinnant | 312926e | 2013-06-30 00:14:43 +0000 | [diff] [blame] | 84 | #elif defined(_SC_NPROCESSORS_ONLN) |
Howard Hinnant | 403f91a | 2012-08-02 18:17:49 +0000 | [diff] [blame] | 85 | long result = sysconf(_SC_NPROCESSORS_ONLN); |
Howard Hinnant | 5f767b7 | 2012-12-27 23:24:31 +0000 | [diff] [blame] | 86 | // sysconf returns -1 if the name is invalid, the option does not exist or |
| 87 | // does not have a definite limit. |
Marshall Clow | b18165e | 2013-02-07 18:48:09 +0000 | [diff] [blame] | 88 | // if sysconf returns some other negative number, we have no idea |
| 89 | // what is going on. Default to something safe. |
| 90 | if (result < 0) |
Howard Hinnant | 5f767b7 | 2012-12-27 23:24:31 +0000 | [diff] [blame] | 91 | return 0; |
Marshall Clow | d854ce6 | 2013-02-07 17:37:58 +0000 | [diff] [blame] | 92 | return static_cast<unsigned>(result); |
Howard Hinnant | 725ae71 | 2013-07-02 17:53:48 +0000 | [diff] [blame] | 93 | #elif defined(_WIN32) |
| 94 | SYSTEM_INFO info; |
| 95 | GetSystemInfo(&info); |
| 96 | return info.dwNumberOfProcessors; |
Howard Hinnant | 16e6e1d | 2010-08-22 00:03:27 +0000 | [diff] [blame] | 97 | #else // defined(CTL_HW) && defined(HW_NCPU) |
Howard Hinnant | adff489 | 2010-05-24 17:49:41 +0000 | [diff] [blame] | 98 | // TODO: grovel through /proc or check cpuid on x86 and similar |
| 99 | // instructions on other architectures. |
Howard Hinnant | f755506 | 2013-10-04 21:14:44 +0000 | [diff] [blame] | 100 | # if defined(_MSC_VER) && ! defined(__clang__) |
| 101 | _LIBCPP_WARNING("hardware_concurrency not yet implemented") |
| 102 | # else |
| 103 | # warning hardware_concurrency not yet implemented |
| 104 | # endif |
Howard Hinnant | adff489 | 2010-05-24 17:49:41 +0000 | [diff] [blame] | 105 | return 0; // Means not computable [thread.thread.static] |
Howard Hinnant | 16e6e1d | 2010-08-22 00:03:27 +0000 | [diff] [blame] | 106 | #endif // defined(CTL_HW) && defined(HW_NCPU) |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | namespace this_thread |
| 110 | { |
| 111 | |
| 112 | void |
| 113 | sleep_for(const chrono::nanoseconds& ns) |
| 114 | { |
| 115 | using namespace chrono; |
Howard Hinnant | cf115d2 | 2012-08-30 19:14:33 +0000 | [diff] [blame] | 116 | if (ns > nanoseconds::zero()) |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 117 | { |
Howard Hinnant | cf115d2 | 2012-08-30 19:14:33 +0000 | [diff] [blame] | 118 | seconds s = duration_cast<seconds>(ns); |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 119 | timespec ts; |
Howard Hinnant | cf115d2 | 2012-08-30 19:14:33 +0000 | [diff] [blame] | 120 | typedef decltype(ts.tv_sec) ts_sec; |
| 121 | _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max(); |
| 122 | if (s.count() < ts_sec_max) |
| 123 | { |
| 124 | ts.tv_sec = static_cast<ts_sec>(s.count()); |
| 125 | ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((ns-s).count()); |
| 126 | } |
| 127 | else |
| 128 | { |
| 129 | ts.tv_sec = ts_sec_max; |
| 130 | ts.tv_nsec = giga::num - 1; |
| 131 | } |
David Majnemer | 0707b67 | 2014-06-04 19:43:20 +0000 | [diff] [blame] | 132 | |
| 133 | while (nanosleep(&ts, &ts) == -1 && errno == EINTR) |
| 134 | ; |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 135 | } |
| 136 | } |
| 137 | |
| 138 | } // this_thread |
| 139 | |
Howard Hinnant | 5306d68 | 2010-10-14 19:18:04 +0000 | [diff] [blame] | 140 | __thread_specific_ptr<__thread_struct>& |
| 141 | __thread_local_data() |
| 142 | { |
| 143 | static __thread_specific_ptr<__thread_struct> __p; |
| 144 | return __p; |
| 145 | } |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 146 | |
| 147 | // __thread_struct_imp |
| 148 | |
Howard Hinnant | 2d72b1e | 2010-12-17 14:46:43 +0000 | [diff] [blame] | 149 | template <class T> |
| 150 | class _LIBCPP_HIDDEN __hidden_allocator |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 151 | { |
Howard Hinnant | 2d72b1e | 2010-12-17 14:46:43 +0000 | [diff] [blame] | 152 | public: |
| 153 | typedef T value_type; |
| 154 | |
| 155 | T* allocate(size_t __n) |
| 156 | {return static_cast<T*>(::operator new(__n * sizeof(T)));} |
Joerg Sonnenberger | 4c6acb5 | 2014-01-04 17:43:00 +0000 | [diff] [blame] | 157 | void deallocate(T* __p, size_t) {::operator delete(static_cast<void*>(__p));} |
Howard Hinnant | 2d72b1e | 2010-12-17 14:46:43 +0000 | [diff] [blame] | 158 | |
| 159 | size_t max_size() const {return size_t(~0) / sizeof(T);} |
| 160 | }; |
| 161 | |
| 162 | class _LIBCPP_HIDDEN __thread_struct_imp |
| 163 | { |
| 164 | typedef vector<__assoc_sub_state*, |
| 165 | __hidden_allocator<__assoc_sub_state*> > _AsyncStates; |
| 166 | typedef vector<pair<condition_variable*, mutex*>, |
| 167 | __hidden_allocator<pair<condition_variable*, mutex*> > > _Notify; |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 168 | |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 169 | _AsyncStates async_states_; |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 170 | _Notify notify_; |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 171 | |
| 172 | __thread_struct_imp(const __thread_struct_imp&); |
| 173 | __thread_struct_imp& operator=(const __thread_struct_imp&); |
| 174 | public: |
| 175 | __thread_struct_imp() {} |
| 176 | ~__thread_struct_imp(); |
| 177 | |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 178 | void notify_all_at_thread_exit(condition_variable* cv, mutex* m); |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 179 | void __make_ready_at_thread_exit(__assoc_sub_state* __s); |
| 180 | }; |
| 181 | |
| 182 | __thread_struct_imp::~__thread_struct_imp() |
| 183 | { |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 184 | for (_Notify::iterator i = notify_.begin(), e = notify_.end(); |
| 185 | i != e; ++i) |
| 186 | { |
| 187 | i->second->unlock(); |
| 188 | i->first->notify_all(); |
| 189 | } |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 190 | for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end(); |
| 191 | i != e; ++i) |
| 192 | { |
| 193 | (*i)->__make_ready(); |
| 194 | (*i)->__release_shared(); |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | void |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 199 | __thread_struct_imp::notify_all_at_thread_exit(condition_variable* cv, mutex* m) |
| 200 | { |
| 201 | notify_.push_back(pair<condition_variable*, mutex*>(cv, m)); |
| 202 | } |
| 203 | |
| 204 | void |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 205 | __thread_struct_imp::__make_ready_at_thread_exit(__assoc_sub_state* __s) |
| 206 | { |
| 207 | async_states_.push_back(__s); |
| 208 | __s->__add_shared(); |
| 209 | } |
| 210 | |
| 211 | // __thread_struct |
| 212 | |
| 213 | __thread_struct::__thread_struct() |
| 214 | : __p_(new __thread_struct_imp) |
| 215 | { |
| 216 | } |
| 217 | |
| 218 | __thread_struct::~__thread_struct() |
| 219 | { |
| 220 | delete __p_; |
| 221 | } |
| 222 | |
| 223 | void |
Howard Hinnant | e6e4d01 | 2010-09-03 21:46:37 +0000 | [diff] [blame] | 224 | __thread_struct::notify_all_at_thread_exit(condition_variable* cv, mutex* m) |
| 225 | { |
| 226 | __p_->notify_all_at_thread_exit(cv, m); |
| 227 | } |
| 228 | |
| 229 | void |
Howard Hinnant | 47499b1 | 2010-08-27 20:10:19 +0000 | [diff] [blame] | 230 | __thread_struct::__make_ready_at_thread_exit(__assoc_sub_state* __s) |
| 231 | { |
| 232 | __p_->__make_ready_at_thread_exit(__s); |
| 233 | } |
| 234 | |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 235 | _LIBCPP_END_NAMESPACE_STD |
Jonathan Roelofs | 8d86b2e | 2014-09-05 19:45:05 +0000 | [diff] [blame] | 236 | |
| 237 | #endif // !_LIBCPP_HAS_NO_THREADS |