Added method get_real_time to get real system time, via Java, from C.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@4335 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/include/prism.h

@@ -43,6 +43,7 @@ typedef struct FoxGlynnWeights
 } FoxGlynnWeights;
 
 // Function prototypes
+EXPORT long get_real_time(JNIEnv *env);
 EXPORT void get_string_array_from_java(JNIEnv *env, jobject strings_list, jstring *&strings_jstrings, const char **&strings, int &size);
 EXPORT void release_string_array_from_java(JNIEnv *env, jstring *strings_jstrings, const char **strings, jint size);
 EXPORT FoxGlynnWeights fox_glynn(double q_tmax, double underflow, double overflow, double accuracy);

prism/src/prism/prism.cc

@@ -31,6 +31,25 @@
 #include <math.h>
 #include <new>
 #include <vector>
+#include "jnipointer.h"
+
+//------------------------------------------------------------------------------
+
+// Get the current time in milliseconds (via Java).
+// Returns -1 in case of error obtaining the time.
+
+long get_real_time(JNIEnv *env)
+{
+	jlong ret = 0;
+	if (env) {
+		jclass cl = env->FindClass("java/lang/System");
+		jmethodID me = env->GetStaticMethodID(cl, "currentTimeMillis", "()J");
+		ret = env->CallLongMethod(cl, me);
+	} else {
+		ret = -1;
+	}
+	return ret;
+}
 
 //------------------------------------------------------------------------------