Platform: Add accurate currentTimeMillis() and currentTimeMicros() native methods, based on 'gettimeofday(..)'

2 files changed, 47 insertions, 0 deletions

diff --git a/src/java/com/jogamp/common/os/Platform.java b/src/java/com/jogamp/common/os/Platform.java
index 9971cf4..32fc9f4 100644
--- a/src/java/com/jogamp/common/os/Platform.java
+++ b/src/java/com/jogamp/common/os/Platform.java
@@ -434,6 +434,28 @@ public class Platform extends PlatformPropsImpl {
     //
     // time / jitter
     //
+    
+    /** 
+     * Returns the unix based current time in milliseconds, based on <code>gettimeofday(..)</code>.
+     * <p>
+     * This is an alternative to {@link System#currentTimeMillis()} and {@link System#nanoTime()}.
+     * While the named {@link System} methods do provide the required precision, 
+     * <code>gettimeofday()</code> <i>also</i> guarantees time accuracy, i.e. update interval.
+     * </p>
+     * @see #currentTimeMicros()
+     */
+    public static native long currentTimeMillis();
+    
+    /** 
+     * Returns the unix based current time in microseconds, based on <code>gettimeofday(..)</code>.
+     * <p>
+     * This is an alternative to {@link System#currentTimeMillis()} and {@link System#nanoTime()}.
+     * While the named {@link System} methods do provide the required precision, 
+     * <code>gettimeofday()</code> <i>also</i> guarantees time accuracy, i.e. update interval.
+     * </p>
+     * @see #currentTimeMillis()
+     */
+    public static native long currentTimeMicros();
 
     /**
      * Returns the estimated sleep jitter value in nanoseconds.
diff --git a/src/native/common/Platforms.c b/src/native/common/Platforms.c
new file mode 100644
index 0000000..f48d020
--- /dev/null
+++ b/src/native/common/Platforms.c
@@ -0,0 +1,25 @@
+
+#include <jni.h>
+
+#include <assert.h>
+
+#include <gluegen_stdint.h>
+
+#include "com_jogamp_common_os_Platform.h"
+
+#include <sys/time.h>
+
+JNIEXPORT jlong JNICALL 
+Java_com_jogamp_common_os_Platform_currentTimeMillis(JNIEnv *env, jclass _unused) {
+    struct timeval tv;
+    gettimeofday(&tv,NULL);
+    return (int64_t)tv.tv_sec * 1000 + tv.tv_usec / 1000;
+}
+
+JNIEXPORT jlong JNICALL 
+Java_com_jogamp_common_os_Platform_currentTimeMicros(JNIEnv *env, jclass _unused) {
+    struct timeval tv;
+    gettimeofday(&tv,NULL);
+    return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
+}
+