diff options
Diffstat (limited to 'src/os/linux/vm/os_linux.cpp')
| -rw-r--r-- | src/os/linux/vm/os_linux.cpp | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/src/os/linux/vm/os_linux.cpp b/src/os/linux/vm/os_linux.cpp index 54149e182..d0751f005 100644 --- a/src/os/linux/vm/os_linux.cpp +++ b/src/os/linux/vm/os_linux.cpp @@ -3871,9 +3871,33 @@ int os::sleep(Thread* thread, jlong millis, bool interruptible) { } } -int os::naked_sleep() { - // %% make the sleep time an integer flag. for now use 1 millisec. - return os::sleep(Thread::current(), 1, false); +// +// Short sleep, direct OS call. +// +// Note: certain versions of Linux CFS scheduler (since 2.6.23) do not guarantee +// sched_yield(2) will actually give up the CPU: +// +// * Alone on this pariticular CPU, keeps running. +// * Before the introduction of "skip_buddy" with "compat_yield" disabled +// (pre 2.6.39). +// +// So calling this with 0 is an alternative. +// +void os::naked_short_sleep(jlong ms) { + struct timespec req; + + assert(ms < 1000, "Un-interruptable sleep, short time use only"); + req.tv_sec = 0; + if (ms > 0) { + req.tv_nsec = (ms % 1000) * 1000000; + } + else { + req.tv_nsec = 1; + } + + nanosleep(&req, NULL); + + return; } // Sleep forever; naked call to OS-specific sleep; use with CAUTION |