2583 }
2584
2585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2586 void os::infinite_sleep() {
2587 while (true) { // sleep forever ...
2588 ::sleep(100); // ... 100 seconds at a time
2589 }
2590 }
2591
2592 // Used to convert frequent JVM_Yield() to nops
2593 bool os::dont_yield() {
2594 return DontYieldALot;
2595 }
2596
2597 void os::yield() {
2598 sched_yield();
2599 }
2600
2601 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2602
2603 void os::yield_all() {
2604 // Yields to all threads, including threads with lower priorities
2605 // Threads on Bsd are all with same priority. The Solaris style
2606 // os::yield_all() with nanosleep(1ms) is not necessary.
2607 sched_yield();
2608 }
2609
2610 ////////////////////////////////////////////////////////////////////////////////
2611 // thread priority support
2612
2613 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2614 // only supports dynamic priority, static priority must be zero. For real-time
2615 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2616 // However, for large multi-threaded applications, SCHED_RR is not only slower
2617 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2618 // of 5 runs - Sep 2005).
2619 //
2620 // The following code actually changes the niceness of kernel-thread/LWP. It
2621 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2622 // not the entire user process, and user level threads are 1:1 mapped to kernel
2623 // threads. It has always been the case, but could change in the future. For
2624 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2625 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2626
2627 #if !defined(__APPLE__)
2628 int os::java_to_os_priority[CriticalPriority + 1] = {
2629 19, // 0 Entry should never be used
|
2583 }
2584
2585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2586 void os::infinite_sleep() {
2587 while (true) { // sleep forever ...
2588 ::sleep(100); // ... 100 seconds at a time
2589 }
2590 }
2591
2592 // Used to convert frequent JVM_Yield() to nops
2593 bool os::dont_yield() {
2594 return DontYieldALot;
2595 }
2596
2597 void os::yield() {
2598 sched_yield();
2599 }
2600
2601 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2602
2603 ////////////////////////////////////////////////////////////////////////////////
2604 // thread priority support
2605
2606 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2607 // only supports dynamic priority, static priority must be zero. For real-time
2608 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2609 // However, for large multi-threaded applications, SCHED_RR is not only slower
2610 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2611 // of 5 runs - Sep 2005).
2612 //
2613 // The following code actually changes the niceness of kernel-thread/LWP. It
2614 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2615 // not the entire user process, and user level threads are 1:1 mapped to kernel
2616 // threads. It has always been the case, but could change in the future. For
2617 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2618 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2619
2620 #if !defined(__APPLE__)
2621 int os::java_to_os_priority[CriticalPriority + 1] = {
2622 19, // 0 Entry should never be used
|