| 267 | } |
| 268 | |
| 269 | int OS::getProfilingSignal(int mode) { |
| 270 | static int preferred_signals[2] = {SIGPROF, SIGVTALRM}; |
| 271 | |
| 272 | const u64 allowed_signals = |
| 273 | 1ULL << SIGPROF | 1ULL << SIGVTALRM | 1ULL << SIGEMT | 1ULL << SIGSYS; |
| 274 | |
| 275 | int& signo = preferred_signals[mode]; |
| 276 | int initial_signo = signo; |
| 277 | int other_signo = preferred_signals[1 - mode]; |
| 278 | |
| 279 | do { |
| 280 | struct sigaction sa; |
| 281 | if ((allowed_signals & (1ULL << signo)) != 0 && signo != other_signo && sigaction(signo, NULL, &sa) == 0) { |
| 282 | if (sa.sa_handler == SIG_DFL || sa.sa_handler == SIG_IGN || sa.sa_sigaction == installed_sigaction[signo]) { |
| 283 | return signo; |
| 284 | } |
| 285 | } |
| 286 | } while ((signo = (signo + 1) & 31) != initial_signo); |
| 287 | |
| 288 | return signo; |
| 289 | } |
| 290 | |
| 291 | bool OS::sendSignalToThread(int thread_id, int signo) { |
| 292 | #ifdef __aarch64__ |