| 566 | } |
| 567 | |
| 568 | void FutexWait() |
| 569 | { |
| 570 | #ifdef _win_ |
| 571 | if (!LFCheckedWinVersion) { |
| 572 | OSVERSIONINFOA ver; |
| 573 | memset(&ver, 0, sizeof(ver)); |
| 574 | ver.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA); |
| 575 | GetVersionExA(&ver); |
| 576 | LFHasFutex = (ver.dwMajorVersion > 6) || (ver.dwMajorVersion == 6 && ver.dwMinorVersion >= 2); |
| 577 | LFCheckedWinVersion = true; |
| 578 | } |
| 579 | if (LFHasFutex) { |
| 580 | if (LockVar == LF_LOCK_LOCKED) { |
| 581 | DoCas(&LockVar, LF_LOCK_FUTEX_WAIT, LF_LOCK_LOCKED); |
| 582 | } |
| 583 | if (LockVar == LF_LOCK_FUTEX_WAIT) { |
| 584 | char* lockedValue = LF_LOCK_FUTEX_WAIT; |
| 585 | WaitOnAddress(&LockVar, &lockedValue, sizeof(LockVar), INFINITE); |
| 586 | } |
| 587 | } else { |
| 588 | SwitchToThread(); |
| 589 | } |
| 590 | #elif defined(_linux_) |
| 591 | if (LFHasFutex) { |
| 592 | if (LockVar == LF_LOCK_LOCKED) { |
| 593 | DoCas(&LockVar, LF_LOCK_FUTEX_WAIT, LF_LOCK_LOCKED); |
| 594 | } |
| 595 | if (LockVar == LF_LOCK_FUTEX_WAIT) { |
| 596 | // linux allow only int variables checks, here we pretend low bits of LockVar are int |
| 597 | syscall(SYS_futex, &LockVar, FUTEX_WAIT_PRIVATE, *(int*)&LF_LOCK_FUTEX_WAIT, 0, 0, 0); |
| 598 | } |
| 599 | } else { |
| 600 | sched_yield(); |
| 601 | } |
| 602 | #else |
| 603 | sched_yield(); |
| 604 | #endif |
| 605 | } |
| 606 | |
| 607 | void Unlock() |
| 608 | { |