| 132 | } |
| 133 | |
| 134 | size_t NSystemInfo::NumberOfCpus() { |
| 135 | #if defined(_linux_) |
| 136 | if (auto res = CgroupCpus(); res) { |
| 137 | return Max<ssize_t>(1, std::llround(res)); |
| 138 | } |
| 139 | #endif |
| 140 | |
| 141 | #if defined(_win_) |
| 142 | SYSTEM_INFO info; |
| 143 | |
| 144 | GetSystemInfo(&info); |
| 145 | |
| 146 | return info.dwNumberOfProcessors; |
| 147 | #elif defined(_SC_NPROCESSORS_ONLN) |
| 148 | return sysconf(_SC_NPROCESSORS_ONLN); |
| 149 | #elif defined(_linux_) |
| 150 | unsigned ret; |
| 151 | int fd, nread, column; |
| 152 | char buf[512]; |
| 153 | static const char matchstr[] = "processor\t:"; |
| 154 | |
| 155 | fd = open("/proc/cpuinfo", O_RDONLY); |
| 156 | |
| 157 | if (fd == -1) { |
| 158 | abort(); |
| 159 | } |
| 160 | |
| 161 | column = 0; |
| 162 | ret = 0; |
| 163 | |
| 164 | while (true) { |
| 165 | nread = read(fd, buf, sizeof(buf)); |
| 166 | |
| 167 | if (nread <= 0) { |
| 168 | break; |
| 169 | } |
| 170 | |
| 171 | for (int i = 0; i < nread; ++i) { |
| 172 | const char ch = buf[i]; |
| 173 | |
| 174 | if (ch == '\n') { |
| 175 | column = 0; |
| 176 | } else if (column != -1) { |
| 177 | if (AsciiToLower(ch) == matchstr[column]) { |
| 178 | ++column; |
| 179 | |
| 180 | if (column == sizeof(matchstr) - 1) { |
| 181 | column = -1; |
| 182 | ++ret; |
| 183 | } |
| 184 | } else { |
| 185 | column = -1; |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | if (ret == 0) { |
nothing calls this directly
no test coverage detected