Clock: Consider return code on failed native clock_gettime(..) call; Add Win32 clock_gettime() implementation.

Consider return code on failed native clock_gettime(..) call
- Return Instant.EPOCH for all Instant variations (essentially 0)
- Return 0 for all 'long' variations (ms, ns)

Add Win32 clock_gettime() implementation.
- Source: https://github.com/Alexpux/mingw-w64/blob/master/mingw-w64-libraries/winpthreads/src/clock.c
- Public Domain within mingw-w64, included here to simplify linkage.
- Tested on Win10 64bit w/ TestTextRendererNEWT00, all values are OK

1 files changed, 18 insertions, 9 deletions

diff --git a/src/java/com/jogamp/common/os/Clock.java b/src/java/com/jogamp/common/os/Clock.java
index 03a0040..9380442 100644
--- a/src/java/com/jogamp/common/os/Clock.java
+++ b/src/java/com/jogamp/common/os/Clock.java
@@ -32,8 +32,11 @@ public class Clock {
         Platform.initSingleton(); // loads native gluegen_rt library
         {
             final long[/*2*/] val = { 0, 0 };
-            getMonotonicStartupTimeImpl(val);
-            t0 = Instant.ofEpochSecond(val[0], val[1]);
+            if( getMonotonicStartupTimeImpl(val) ) {
+                t0 = Instant.ofEpochSecond(val[0], val[1]);
+            } else {
+                t0 = Instant.EPOCH;
+            }
         }
     }
 
@@ -59,10 +62,13 @@ public class Clock {
      */
     public static Instant getMonotonicTime() {
         final long[/*2*/] val = { 0, 0 };
-        getMonotonicTimeImpl(val);
-        return Instant.ofEpochSecond(val[0], val[1]);
+        if( getMonotonicTimeImpl(val) ) {
+            return Instant.ofEpochSecond(val[0], val[1]);
+        } else {
+            return Instant.EPOCH;
+        }
     }
-    private static native void getMonotonicTimeImpl(final long[/*2*/] val);
+    private static native boolean getMonotonicTimeImpl(final long[/*2*/] val);
 
     /**
      * Returns current wall-clock real-time since Unix Epoch `00:00:00 UTC on 1970-01-01`.
@@ -80,10 +86,13 @@ public class Clock {
      */
     public static Instant getWallClockTime() {
         final long[/*2*/] val = { 0, 0 };
-        getWallClockTimeImpl(val);
-        return Instant.ofEpochSecond(val[0], val[1]);
+        if( getWallClockTimeImpl(val) ) {
+            return Instant.ofEpochSecond(val[0], val[1]);
+        } else {
+            return Instant.EPOCH;
+        }
     }
-    private static native void getWallClockTimeImpl(final long[/*2*/] val);
+    private static native boolean getWallClockTimeImpl(final long[/*2*/] val);
 
     /**
      * Returns the monotonic startup time since module startup as used in {@link #currentNanos()} and {@link #getMonotonicNanos()}.
@@ -91,7 +100,7 @@ public class Clock {
      * @see #getMonotonicNanos()
      */
     public static Instant getMonotonicStartupTime() { return t0; }
-    private static native void getMonotonicStartupTimeImpl(final long[/*2*/] val);
+    private static native boolean getMonotonicStartupTimeImpl(final long[/*2*/] val);
 
     /**
      * Returns current monotonic nanoseconds since start of this application.