src/os/linux/vm/os_linux.cpp
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@@ -3866,13 +3866,37 @@
}
return OS_OK ;
}
}
-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
void os::infinite_sleep() {
while (true) { // sleep forever ...