[Bug classpath/44411] System.nanoTime() is not independent of wall-clock time

[gnu_andrew at member dot fsf.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44411

Andrew John Hughes <gnu_andrew at member dot fsf.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |gnu_andrew at member dot
                   |                            |fsf.org
         Resolution|                            |FIXED
         AssignedTo|unassigned at gcc dot       |gnu_andrew at member dot
                   |gnu.org                     |fsf.org

--- Comment #3 from Andrew John Hughes <gnu_andrew at member dot fsf.org> 
2010-11-05 00:18:31 UTC ---
CVSROOT:        /sources/classpath
Module name:    classpath
Changes by:     Andrew John Hughes <gnu_andrew> 10/11/05 00:09:47

Modified files:
       .              : ChangeLog
       native/jni/java-lang: java_lang_VMSystem.c
       vm/reference/java/lang: VMSystem.java

Log message:
       PR44411: Make VMSystem.nanoTime independent of wall time where possible.

       2010-11-04  Andrew John Hughes  <address@hidden>

               Provide a fallback for systems without POSIX timers.
               * native/jni/java-lang/java_lang_VMSystem.c:
               (currentTimeMillis): New function which provides
               the behaviour for both Java_java_lang_VMSystem_currentTimeMillis
               and the fallback by obtaining the result of gettimeofday.
               (Java_java_lang_VMSystem_nanoTime): Return currentTimeMillis
               multiplied by a 1000 if a monotonic clock is unavailable.
               (Java_java_lang_VMSystem_currentTimeMillis): Split main
behaviour
               out into currentTimeMillis and then return its result divided by
a
               1000.

       2010-07-08  Roland Brand  <address@hidden>
               Pekka Enberg  <address@hidden>

               PR classpath/44411
               * native/jni/java-lang/java_lang_VMSystem.c:
               (Java_java_lang_VMSystem_nanoTime): Implement
               using POSIX monotonic clock support and clock_gettime.
               (Java_java_lang_VMSystem_currentTimeMillis):
               Use old nanoTime method (which uses gettimeofday) to
               provide the current time in milliseconds.
               * vm/reference/java/lang/VMSystem.java:
               (currentTimeMillis()): Make native with its own implementation
               rather than using nanoTime, which should be
               independent of wall-clock time.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/classpath/ChangeLog?cvsroot=classpath&r1=1.9802&r2=1.9803
http://cvs.savannah.gnu.org/viewcvs/classpath/native/jni/java-lang/java_lang_VMSystem.c?cvsroot=classpath&r1=1.15&r2=1.16
http://cvs.savannah.gnu.org/viewcvs/classpath/vm/reference/java/lang/VMSystem.java?cvsroot=classpath&r1=1.19&r2=1.20