java - What's the purpose of sleep(long millis, int nanos)? -


in jdk, it's implemented as:

public static void sleep(long millis, int nanos)  throws interruptedexception { if (millis < 0) {         throw new illegalargumentexception("timeout value negative"); }  if (nanos < 0 || nanos > 999999) {         throw new illegalargumentexception(             "nanosecond timeout value out of range"); }  if (nanos >= 500000 || (nanos != 0 && millis == 0)) {     millis++; }  sleep(millis); }

which means nanos argument doesn't @ all.

is idea behind on hardware more accurate timing, jvm can provide better implementation it?

a regular os doesn't have fine grained enough resolution sleep nanoseconds @ time. however, real time operating systems exist, scheduling event take place @ exact moment in time critical , latencies many operations low. abs system 1 example of rtos. sleeping nanoseconds more useful on such systems on normal oses os can't reliably sleep period less 15ms.

however, having 2 separate jdks no solution. hence on windows , linux jvm make best attempt sleep x nanoseconds.


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