3851 // the 1st iteration ...
3852 jlong newtime = javaTimeNanos();
3853
3854 if (newtime - prevtime < 0) {
3855 // time moving backwards, should only happen if no monotonic clock
3856 // not a guarantee() because JVM should not abort on kernel/glibc bugs
3857 assert(!Linux::supports_monotonic_clock(), "time moving backwards");
3858 } else {
3859 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
3860 }
3861
3862 if(millis <= 0) break ;
3863
3864 prevtime = newtime;
3865 slp->park(millis);
3866 }
3867 return OS_OK ;
3868 }
3869 }
3870
3871 int os::naked_sleep() {
3872 // %% make the sleep time an integer flag. for now use 1 millisec.
3873 return os::sleep(Thread::current(), 1, false);
3874 }
3875
3876 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3877 void os::infinite_sleep() {
3878 while (true) { // sleep forever ...
3879 ::sleep(100); // ... 100 seconds at a time
3880 }
3881 }
3882
3883 // Used to convert frequent JVM_Yield() to nops
3884 bool os::dont_yield() {
3885 return DontYieldALot;
3886 }
3887
3888 void os::yield() {
3889 sched_yield();
3890 }
3891
3892 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
3893
|
3851 // the 1st iteration ...
3852 jlong newtime = javaTimeNanos();
3853
3854 if (newtime - prevtime < 0) {
3855 // time moving backwards, should only happen if no monotonic clock
3856 // not a guarantee() because JVM should not abort on kernel/glibc bugs
3857 assert(!Linux::supports_monotonic_clock(), "time moving backwards");
3858 } else {
3859 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
3860 }
3861
3862 if(millis <= 0) break ;
3863
3864 prevtime = newtime;
3865 slp->park(millis);
3866 }
3867 return OS_OK ;
3868 }
3869 }
3870
3871 //
3872 // Short sleep, direct OS call.
3873 //
3874 // Note: certain versions of Linux CFS scheduler (since 2.6.23) do not guarantee
3875 // sched_yield(2) will actually give up the CPU:
3876 //
3877 // * Alone on this pariticular CPU, keeps running.
3878 // * Before the introduction of "skip_buddy" with "compat_yield" disabled
3879 // (pre 2.6.39).
3880 //
3881 // So calling this with 0 is an alternative.
3882 //
3883 void os::naked_short_sleep(jlong ms) {
3884 struct timespec req;
3885
3886 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3887 req.tv_sec = 0;
3888 if (ms > 0) {
3889 req.tv_nsec = (ms % 1000) * 1000000;
3890 }
3891 else {
3892 req.tv_nsec = 1;
3893 }
3894
3895 nanosleep(&req, NULL);
3896
3897 return;
3898 }
3899
3900 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3901 void os::infinite_sleep() {
3902 while (true) { // sleep forever ...
3903 ::sleep(100); // ... 100 seconds at a time
3904 }
3905 }
3906
3907 // Used to convert frequent JVM_Yield() to nops
3908 bool os::dont_yield() {
3909 return DontYieldALot;
3910 }
3911
3912 void os::yield() {
3913 sched_yield();
3914 }
3915
3916 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
3917
|