cache for pid/ppid/host in Process.java

diff --git a/org/simgrid/msg/Process.java b/org/simgrid/msg/Process.java
index d2d657e..bae4db2 100644 (file)
--- a/org/simgrid/msg/Process.java
+++ b/org/simgrid/msg/Process.java
@@ -76,6 +76,18 @@ public abstract class Process extends Thread {
         * The name of the process.                                                     
         */
        protected String name;
+       /**
+         * The PID of the process
+         */
+       protected int pid = -1;
+       /**
+        * The PPID of the process 
+        */
+       protected int ppid = -1;
+       /**
+        * The host of the process
+        */
+       protected Host host = null;
     /**
      *
      * @return
@@ -174,6 +186,7 @@ public abstract class Process extends Thread {
                        this.args.addAll(Arrays.asList(args));
 
                MsgNative.processCreate(this, host);
+               
        }
 
 
@@ -287,7 +300,10 @@ public abstract class Process extends Thread {
         */ 
        public Host getHost() {
                Process.ifInterruptedStop();
-               return MsgNative.processGetHost(this);
+               if (this.host == null) {
+                       this.host = MsgNative.processGetHost(this);
+               }
+               return this.host;
        }
        /**
         * This static method gets a process from a PID.
@@ -310,7 +326,10 @@ public abstract class Process extends Thread {
         */ 
        public int getPID()  {
                Process.ifInterruptedStop();
-               return MsgNative.processGetPID(this);
+               if (pid == -1) {
+                       pid = MsgNative.processGetPID(this);
+               }
+               return pid;
        }
        /**
         * This method returns the PID of the parent of a process.
@@ -320,7 +339,10 @@ public abstract class Process extends Thread {
         */ 
        public int getPPID()  {
                Process.ifInterruptedStop();
-               return MsgNative.processGetPPID(this);
+               if (ppid == -1) {
+                       ppid = MsgNative.processGetPPID(this);
+               }
+               return ppid;
        }
        /**
         * This static method returns the currently running process.
@@ -342,6 +364,7 @@ public abstract class Process extends Thread {
        public static void migrate(Process process, Host host)  {
                Process.ifInterruptedStop();
                MsgNative.processMigrate(process, host);
+               process.host = null;
        }
        /**
         * Makes the current process sleep until time seconds have elapsed.