1 /* Copyright (c) 2006-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 package org.simgrid.msg;
9 import java.util.Arrays;
10 import java.util.Vector;
13 * A process may be defined as a code, with some private data, executing
14 * in a location (host). All the process used by your simulation must be
15 * declared in the deployment file (XML format).
16 * To create your own process you must inherit your own process from this
17 * class and override the method "main()". For example if you want to use
18 * a process named Slave proceed as it :
20 * (1) import the class Process of the package simgrid.msg
21 * import simgrid.msg.Process;
23 * public class Slave extends simgrid.msg.Process {
25 * (2) Override the method function
28 * public void main(String[] args) {
29 * System.out.println("Hello MSG");
33 * The name of your process must be declared in the deployment file of your simulation.
34 * For the example, for the previous process Slave this file must contains a line :
35 * <process host="Maxims" function="Slave"/>, where Maxims is the host of the process
36 * Slave. All the process of your simulation are automatically launched and managed by Msg.
37 * A process use tasks to simulate communications or computations with another process.
38 * For more information see Task. For more information on host concept
43 public abstract class Process implements Runnable {
45 * This attribute represents a bind between a java process object and
46 * a native process. Even if this attribute is public you must never
47 * access to it. It is set automatically during the build of the object.
51 * Indicates if the process is started
55 * Even if this attribute is public you must never access to it.
56 * It is used to compute the id of an MSG process.
58 public static long nextProcessId = 0;
61 * Even if this attribute is public you must never access to it.
62 * It is compute automatically during the creation of the object.
63 * The native functions use this identifier to synchronize the process.
68 * Start time of the process
70 public double startTime = 0;
72 * Kill time of the process
74 public double killTime = -1;
77 * The name of the process.
79 protected String name;
81 * The PID of the process
83 protected int pid = -1;
85 * The PPID of the process
87 protected int ppid = -1;
89 * The host of the process
91 protected Host host = null;
93 /** The arguments of the method function of the process. */
94 public Vector<String> args;
100 protected Process() {
101 this.id = nextProcessId++;
104 this.args = new Vector<String>();
109 * Constructs a new process from the name of a host and his name. The method
110 * function of the process doesn't have argument.
112 * @param hostname The name of the host of the process to create.
113 * @param name The name of the process.
115 * @exception HostNotFoundException if no host with this name exists.
119 public Process(String hostname, String name) throws HostNotFoundException {
120 this(Host.getByName(hostname), name, null);
123 * Constructs a new process from the name of a host and his name. The arguments
124 * of the method function of the process are specified by the parameter args.
126 * @param hostname The name of the host of the process to create.
127 * @param name The name of the process.
128 * @param args The arguments of the main function of the process.
130 * @exception HostNotFoundException if no host with this name exists.
132 * @throws NativeException
135 public Process(String hostname, String name, String args[]) throws HostNotFoundException, NativeException {
136 this(Host.getByName(hostname), name, args);
139 * Constructs a new process from a host and his name. The method function of the
140 * process doesn't have argument.
142 * @param host The host of the process to create.
143 * @param name The name of the process.
146 public Process(Host host, String name) {
147 this(host, name, null);
150 * Constructs a new process from a host and his name, the arguments of here method function are
151 * specified by the parameter args.
153 * @param host The host of the process to create.
154 * @param name The name of the process.
155 * @param args The arguments of main method of the process.
157 public Process(Host host, String name, String[]args) {
161 throw new NullPointerException("Process name cannot be NULL");
164 this.args = new Vector<String>();
166 this.args.addAll(Arrays.asList(args));
169 * Constructs a new process from a host and his name, the arguments of here method function are
170 * specified by the parameter args.
172 * @param host The host of the process to create.
173 * @param name The name of the process.
174 * @param args The arguments of main method of the process.
175 * @param startTime Start time of the process
176 * @param killTime Kill time of the process
179 public Process(Host host, String name, String[]args, double startTime, double killTime) {
183 throw new NullPointerException("Process name cannot be NULL");
186 this.args = new Vector<String>();
188 this.args.addAll(Arrays.asList(args));
190 this.startTime = startTime;
191 this.killTime = killTime;
194 * The natively implemented method to create an MSG process.
195 * @param hostName A valid (bound) host where create the process.
197 protected native void create(String hostName) throws HostNotFoundException;
199 * This method kills all running process of the simulation.
201 * @param resetPID Should we reset the PID numbers. A negative number means no reset
202 * and a positive number will be used to set the PID of the next newly
205 * @return The function returns the PID of the next created process.
208 public static native int killAll(int resetPID);
211 * This method kill a process.
214 public native void kill();
216 * Suspends the process by suspending the task on which it was
217 * waiting for the completion.
219 public native void suspend();
221 * Suspends the process by suspending the task on which it was
222 * waiting for the completion.
223 * DEPRECATED: use suspend instead.
226 public void pause() {
230 * Sets the "auto-restart" flag of the process.
232 public native void setAutoRestart(boolean autoRestart);
234 * Restarts the process from the beginning
236 public native void restart();
238 * Resumes a suspended process by resuming the task on which it was
239 * waiting for the completion.
241 public native void resume();
243 * Tests if a process is suspended.
245 * @return The method returns true if the process is suspended.
246 * Otherwise the method returns false.
248 public native boolean isSuspended();
250 * Returns the name of the process
252 public String msgName() {
256 * Returns the host of the process.
257 * @return The host instance of the process.
259 public Host getHost() {
263 * This static method gets a process from a PID.
265 * @param PID The process identifier of the process to get.
267 * @return The process with the specified PID.
269 * @exception NativeException on error in the native SimGrid code
271 public static native Process fromPID(int PID) throws NativeException;
273 * This method returns the PID of the process.
275 * @return The PID of the process.
278 public int getPID() {
282 * This method returns the PID of the parent of a process.
284 * @return The PID of the parent of the process.
287 public int getPPID() {
291 * Returns the value of a given process property.
293 public native String getProperty(String name);
296 * Set the kill time of the process
297 * @param killTime the time when the process is killed
299 public native void setKillTime(double killTime);
302 * This static method returns the currently running process.
304 * @return The current process.
307 public static native Process getCurrentProcess();
309 * Migrates a process to another host.
311 * @param host The host where to migrate the process.
314 public native void migrate(Host host);
316 * Makes the current process sleep until millis millisecondes have elapsed.
317 * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds.
318 * FIXME: Not optimal, maybe we should have two native functions.
319 * @param millis the length of time to sleep in milliseconds.
321 public static void sleep(long millis) throws HostFailureException {
325 * Makes the current process sleep until millis milliseconds and nanos nanoseconds
327 * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds and nanoseconds.
328 * Overloads Thread.sleep.
329 * @param millis the length of time to sleep in milliseconds.
330 * @param nanos additionnal nanoseconds to sleep.
332 public native static void sleep(long millis, int nanos) throws HostFailureException;
334 * Makes the current process sleep until time seconds have elapsed.
335 * @param seconds The time the current process must sleep.
337 public native void waitFor(double seconds) throws HostFailureException;
341 public void showArgs() {
342 Msg.info("[" + this.name + "/" + this.getHost().getName() + "] argc=" +
344 for (int i = 0; i < this.args.size(); i++)
345 Msg.info("[" + this.msgName() + "/" + this.getHost().getName() +
346 "] args[" + i + "]=" + this.args.get(i));
349 * This method actually creates and run the process.
350 * It is a noop if the process is already launched.
351 * @throws HostNotFoundException
353 public final void start() throws HostNotFoundException {
356 create(host.getName());
361 * This method runs the process. Il calls the method function that you must overwrite.
365 String[] args = null; /* do not fill it before the signal or this.args will be empty */
366 //waitSignal(); /* wait for other people to fill the process in */
369 args = new String[this.args.size()];
370 if (this.args.size() > 0) {
371 this.args.toArray(args);
375 } catch(MsgException e) {
377 Msg.info("Unexpected behavior. Stopping now");
380 catch(ProcessKilledError pk) {
386 * The main function of the process (to implement).
389 * @throws MsgException
391 public abstract void main(String[]args) throws MsgException;
393 public native void exit();
395 * Class initializer, to initialize various JNI stuff
397 public static native void nativeInit();
403 * This static method returns the current amount of processes running
405 * @return The count of the running processes
407 public native static int getCount();