4 * Copyright 2006,2007 Martin Quinson, Malek Cherier
7 * This program is free software; you can redistribute
8 * it and/or modify it under the terms of the license
9 *(GNU LGPL) which comes with this package.
14 import java.lang.Thread;
18 * A process may be defined as a code, with some private data, executing
19 * in a location (host). All the process used by your simulation must be
20 * declared in the deployment file (XML format).
21 * To create your ouwn process you must inherite your own process from this
22 * class and override the method "main()". For example if you want to use
23 * a process named Slave proceed as it :
25 * (1) import the class Process of the package simgrid.msg
26 * import simgrid.msg.Process;
28 * public class Slave extends simgrid.msg.Process {
30 * (2) Override the method function
33 * public void main(String[] args) {
34 * System.out.println("Hello MSG");
38 * The name of your process must be declared in the deployment file of your simulation.
39 * For the exemple, for the previouse process Slave this file must contains a line :
40 * <process host="Maxims" function="Slave"/>, where Maxims is the host of the process
41 * Slave. All the process of your simulation are automaticaly launched and managed by Msg.
42 * A process use tasks to simulate communications or computations with another process.
43 * For more information see Task. For more information on host concept
46 * @author Abdelmalek Cherier
47 * @author Martin Quinson
51 public abstract class Process extends Thread {
53 * This attribute represents a bind between a java process object and
54 * a native process. Even if this attribute is public you must never
55 * access to it. It is set automaticatly during the build of the object.
60 * Even if this attribute is public you must never access to it.
61 * It is used to compute the id of an MSG process.
63 public static long nextProcessId = 0;
66 * Even if this attribute is public you must never access to it.
67 * It is compute automaticaly during the creation of the object.
68 * The native functions use this identifier to synchronize the process.
72 public Hashtable properties;
75 * The name of the process.
77 protected String name;
78 public String msgName() {
82 * The arguments of the method function of the process.
83 */ public Vector args;
85 /* process synchronisation tools */
86 protected Sem schedBegin, schedEnd;
89 * Default constructor. (used in ApplicationHandler to initialize it)
96 this.args = new Vector();
97 this.properties = null;
98 schedBegin = new Sem(0);
99 schedEnd = new Sem(0);
104 * Constructs a new process from the name of a host and his name. The method
105 * function of the process doesn't have argument.
107 * @param hostname The name of the host of the process to create.
108 * @param name The name of the process.
110 * @exception HostNotFoundException if no host with this name exists.
111 * NullPointerException if the provided name is null
112 * JniException on JNI madness
115 public Process(String hostname, String name)
116 throws NullPointerException, HostNotFoundException, JniException,
118 this(Host.getByName(hostname), name, null);
121 * Constructs a new process from the name of a host and his name. The arguments
122 * of the method function of the process are specified by the parameter args.
124 * @param hostname The name of the host of the process to create.
125 * @param name The name of the process.
126 * @param args The arguments of the main function of the process.
128 * @exception HostNotFoundException if no host with this name exists.
129 * NullPointerException if the provided name is null
130 * JniException on JNI madness
133 public Process(String hostname, String name, String args[])
134 throws NullPointerException, HostNotFoundException, JniException,
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.
145 * @exception NullPointerException if the provided name is null
146 * JniException on JNI madness
149 public Process(Host host, String name) throws NullPointerException,
151 this(host, name, null);
154 * Constructs a new process from a host and his name, the arguments of here method function are
155 * specified by the parameter args.
157 * @param host The host of the process to create.
158 * @param name The name of the process.
159 * @param args The arguments of main method of the process.
161 * @exception NullPointerException if the provided name is null
162 * JniException on JNI madness
165 public Process(Host host, String name,
166 String[]args) throws NullPointerException, JniException {
167 /* This is the constructor called by all others */
170 throw new NullPointerException("Process name cannot be NULL");
172 this.properties = null;
174 this.args = new Vector();
177 this.args.addAll(Arrays.asList(args));
180 this.id = nextProcessId++;
182 schedBegin = new Sem(0);
183 schedEnd = new Sem(0);
185 MsgNative.processCreate(this, host);
190 * This method kills all running process of the simulation.
192 * @param resetPID Should we reset the PID numbers. A negative number means no reset
193 * and a positive number will be used to set the PID of the next newly
196 * @return The function returns the PID of the next created process.
198 */ public static int killAll(int resetPID) {
199 return MsgNative.processKillAll(resetPID);
203 * This method adds an argument in the list of the arguments of the main function
206 * @param arg The argument to add.
208 protected void addArg(String arg) {
213 * This method suspends the process by suspending the task on which it was
214 * waiting for the completion.
216 * @exception JniException on JNI madness
217 * NativeException on error in the native SimGrid code
219 public void pause() throws JniException, NativeException {
220 MsgNative.processSuspend(this);
223 * This method resumes a suspended process by resuming the task on which it was
224 * waiting for the completion.
226 * @exception JniException on JNI madness
227 * NativeException on error in the native SimGrid code
229 */ public void restart() throws JniException, NativeException {
230 MsgNative.processResume(this);
233 * This method tests if a process is suspended.
235 * @return The method returns true if the process is suspended.
236 * Otherwise the method returns false.
238 * @exception JniException on JNI madness
239 */ public boolean isSuspended() throws JniException {
240 return MsgNative.processIsSuspended(this);
243 * This method returns the host of a process.
245 * @return The host instance of the process.
247 * @exception JniException on JNI madness
248 * NativeException on error in the native SimGrid code
250 */ public Host getHost() throws JniException, NativeException {
251 return MsgNative.processGetHost(this);
254 * This static method get a process from a PID.
256 * @param PID The process identifier of the process to get.
258 * @return The process with the specified PID.
260 * @exception NativeException on error in the native SimGrid code
261 */ public static Process fromPID(int PID) throws NativeException {
262 return MsgNative.processFromPID(PID);
265 * This method returns the PID of the process.
267 * @return The PID of the process.
269 * @exception JniException on JNI madness
270 * NativeException on error in the native SimGrid code
271 */ public int getPID() throws JniException, NativeException {
272 return MsgNative.processGetPID(this);
275 * This method returns the PID of the parent of a process.
277 * @return The PID of the parent of the process.
279 * @exception NativeException on error in the native SimGrid code
280 */ public int getPPID() throws NativeException {
281 return MsgNative.processGetPPID(this);
284 * This static method returns the currently running process.
286 * @return The current process.
288 * @exception NativeException on error in the native SimGrid code
291 */ public static Process currentProcess() throws NativeException {
292 return MsgNative.processSelf();
295 * This static method returns the PID of the currently running process.
297 * @return The PID of the current process.
298 */ public static int currentProcessPID() {
299 return MsgNative.processSelfPID();
303 * This static method returns the PID of the parent of the currently running process.
305 * @return The PID of the parent of current process.
307 public static int currentProcessPPID() {
308 return MsgNative.processSelfPPID();
312 * This function migrates a process to another host.
314 * @param host The host where to migrate the process.
316 * @exception JniException on JNI madness
317 * NativeException on error in the native SimGrid code
319 public void migrate(Host host) throws JniException, NativeException {
320 MsgNative.processChangeHost(this, host);
323 * This method makes the current process sleep until time seconds have elapsed.
325 * @param seconds The time the current process must sleep.
327 * @exception NativeException on error in the native SimGrid code
328 */ public static void waitFor(double seconds) throws NativeException {
329 MsgNative.processWaitFor(seconds);
330 } public void showArgs() {
332 Msg.info("[" + this.name + "/" + this.getHost().getName() + "] argc=" +
334 for (int i = 0; i < this.args.size(); i++)
335 Msg.info("[" + this.msgName() + "/" + this.getHost().getName() +
336 "] args[" + i + "]=" + (String) (this.args.get(i)));
337 } catch(MsgException e) {
338 Msg.info("Damn JNI stuff");
344 * This method runs the process. Il calls the method function that you must overwrite.
346 public /*synchronized*/ void run() {
348 String[]args = null; /* do not fill it before the signal or this.args will be empty */
350 //waitSignal(); /* wait for other people to fill the process in */
354 schedBegin.acquire();
355 } catch(InterruptedException e) {
361 args = new String[this.args.size()];
362 if (this.args.size() > 0) {
363 this.args.toArray(args);
367 MsgNative.processExit(this);
370 catch(MsgException e) {
372 Msg.info("Unexpected behavior. Stopping now");
378 * The main function of the process (to implement).
380 public abstract void main(String[]args)
381 throws JniException, NativeException;
384 public void unschedule() {
387 schedBegin.acquire();
388 } catch(InterruptedException e) {
392 public void schedule() {
394 schedBegin.release();
396 } catch(InterruptedException e) {
400 /** Send the given task to given host on given channel */
401 public void taskPut(Host host, int channel,
402 Task task) throws NativeException, JniException {
403 MsgNative.hostPut(host, channel, task, -1);
406 /** Send the given task to given host on given channel (waiting at most given time)*/
407 public void taskPut(Host host, int channel,
408 Task task, double timeout) throws NativeException, JniException {
409 MsgNative.hostPut(host, channel, task, timeout);
411 /** Receive a task on given channel */
412 public Task taskGet(int channel) throws NativeException,
414 return MsgNative.taskGet(channel, -1, null);
416 /** Receive a task on given channel (waiting at most given time) */
417 public Task taskGet(int channel,
418 double timeout) throws NativeException,
420 return MsgNative.taskGet(channel, timeout, null);
422 /** Receive a task on given channel from given sender */
423 public Task taskGet(int channel, Host host) throws NativeException,
425 return MsgNative.taskGet(channel, -1, host);
427 /** Receive a task on given channel from given sender (waiting at most given time) */
428 public Task taskGet(int channel, double timeout,
429 Host host) throws NativeException, JniException {
430 return MsgNative.taskGet(channel, timeout, host);
433 /** Send the given task in the mailbox associated with the specified alias (waiting at most given time) */
434 public void taskSend(String alias,
435 Task task, double timeout) throws NativeException, JniException {
436 MsgNative.taskSend(alias, task, timeout);
439 /** Send the given task in the mailbox associated with the specified alias*/
440 public void taskSend(String alias,
441 Task task) throws NativeException, JniException {
442 MsgNative.taskSend(alias, task, -1);
445 /** Send the given task in the mailbox associated with the default alias (defaultAlias = "hostName:processName") */
446 public void taskSend(Task task) throws NativeException, JniException {
448 String alias = this.getHost().getName() + ":" + this.msgName();
449 MsgNative.taskSend(alias, task, -1);
452 /** Send the given task in the mailbox associated with the default alias (waiting at most given time) */
453 public void taskSend(Task task, double timeout) throws NativeException, JniException {
455 String alias = this.getHost().getName() + ":" + this.msgName();
456 MsgNative.taskSend(alias, task, timeout);
460 /** Receive a task on mailbox associated with the specified alias */
461 public Task taskReceive(String alias) throws NativeException,
463 return MsgNative.taskReceive(alias, -1.0, null);
466 /** Receive a task on mailbox associated with the default alias */
467 public Task taskReceive() throws NativeException,
469 String alias = this.getHost().getName() + ":" + this.msgName();
470 return MsgNative.taskReceive(alias, -1.0, null);
473 /** Receive a task on mailbox associated with the specified alias (waiting at most given time) */
474 public Task taskReceive(String alias,
475 double timeout) throws NativeException,
477 return MsgNative.taskReceive(alias, timeout, null);
480 /** Receive a task on mailbox associated with the default alias (waiting at most given time) */
481 public Task taskReceive(double timeout) throws NativeException,
483 String alias = this.getHost().getName() + ":" + this.msgName();
484 return MsgNative.taskReceive(alias, timeout, null);
487 /** Receive a task on mailbox associated with the specified alias from given sender */
488 public Task taskReceive(String alias,
489 double timeout, Host host) throws NativeException,
491 return MsgNative.taskReceive(alias, timeout, host);
494 /** Receive a task on mailbox associated with the default alias from given sender (waiting at most given time) */
495 public Task taskReceive(double timeout, Host host) throws NativeException,
497 String alias = this.getHost().getName() + ":" + this.msgName();
498 return MsgNative.taskReceive(alias, timeout, host);
501 /** Receive a task on mailbox associated with the specified alias from given sender*/
502 public Task taskReceive(String alias,
503 Host host) throws NativeException,
505 return MsgNative.taskReceive(alias, -1.0, host);
507 /** Receive a task on mailbox associated with the default alias from given sender */
508 public Task taskReceive( Host host) throws NativeException,
510 String alias = this.getHost().getName() + ":" + this.msgName();
511 return MsgNative.taskReceive(alias, -1.0, host);