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8068730: Increase the precision of the implementation of java.time.Clock.systemUTC()

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Changes the implementation of java.time.Clock.systemUTC() to take advantage of the maximum resolution of the underlying native clock on which System.currentTimeMillis() is based.

Reviewed-by: dholmes, rriggs, scolebourne, sla
This commit is contained in:
Daniel Fuchs 2015-01-28 17:52:48 +01:00
parent f6d01b3697
commit 967c448681
17 changed files with 122 additions and 17 deletions
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11
hotspot/src/os/linux/vm/os_linux.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1322,6 +1322,15 @@ jlong os::javaTimeMillis() {
return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
}
void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
seconds = jlong(time.tv_sec);
nanos = jlong(time.tv_usec) * 1000;
}
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC (1)
#endif