X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/601b0b84937fb065edd43e83f755e2eae4a1de0e..5b9ad84fa8c98062be8d44fce9dc54bf44f29564:/org/simgrid/msg/Process.java diff --git a/org/simgrid/msg/Process.java b/org/simgrid/msg/Process.java index bd3f943b40..c6005d6030 100644 --- a/org/simgrid/msg/Process.java +++ b/org/simgrid/msg/Process.java @@ -1,12 +1,10 @@ /* - * $Id$ - * - * Copyright 2006,2007 Martin Quinson, Malek Cherier + * Copyright 2006-2012 The SimGrid team * All right reserved. * * This program is free software; you can redistribute * it and/or modify it under the terms of the license - *(GNU LGPL) which comes with this package. + * (GNU LGPL) which comes with this package. */ package org.simgrid.msg; @@ -14,6 +12,7 @@ package org.simgrid.msg; import java.util.Arrays; import java.util.Hashtable; import java.util.Vector; +import java.lang.Runnable; import java.util.concurrent.Semaphore; /** @@ -47,26 +46,38 @@ import java.util.concurrent.Semaphore; * */ -public abstract class Process extends Thread { +public abstract class Process implements Runnable { /** * This attribute represents a bind between a java process object and * a native process. Even if this attribute is public you must never * access to it. It is set automatically during the build of the object. */ - public long bind; - + private long bind; + /** + * Indicates if the process is started + */ + boolean started; /** * Even if this attribute is public you must never access to it. * It is used to compute the id of an MSG process. */ public static long nextProcessId = 0; - + /** * Even if this attribute is public you must never access to it. * It is compute automatically during the creation of the object. * The native functions use this identifier to synchronize the process. */ public long id; + + /** + * Start time of the process + */ + public double startTime = 0; + /** + * Kill time of the process + */ + public double killTime = -1; public Hashtable properties; @@ -90,24 +101,16 @@ public abstract class Process extends Thread { /** The arguments of the method function of the process. */ public Vector args; - /* process synchronization tools */ - /* give the full path to semaphore to ensure that our own implementation don't get selected */ - protected java.util.concurrent.Semaphore schedBegin, schedEnd; - private boolean nativeStop = false; - /** * Default constructor (used in ApplicationHandler to initialize it) */ protected Process() { - super(); this.id = nextProcessId++; this.name = null; this.bind = 0; this.args = new Vector(); this.properties = null; - schedBegin = new java.util.concurrent.Semaphore(0); - schedEnd = new java.util.concurrent.Semaphore(0); } @@ -159,12 +162,10 @@ public abstract class Process extends Thread { * @param host The host of the process to create. * @param name The name of the process. * @param args The arguments of main method of the process. - * - */ + */ public Process(Host host, String name, String[]args) { - /* This is the constructor called by all others */ this(); - + this.host = host; if (name == null) throw new NullPointerException("Process name cannot be NULL"); this.name = name; @@ -172,13 +173,35 @@ public abstract class Process extends Thread { this.args = new Vector(); if (null != args) this.args.addAll(Arrays.asList(args)); + + this.properties = new Hashtable(); + } + /** + * Constructs a new process from a host and his name, the arguments of here method function are + * specified by the parameter args. + * + * @param host The host of the process to create. + * @param name The name of the process. + * @param args The arguments of main method of the process. + * @param startTime Start time of the process + * @param killTime Kill time of the process + * + */ + public Process(Host host, String name, String[]args, double startTime, double killTime) { + this(); + this.host = host; + if (name == null) + throw new NullPointerException("Process name cannot be NULL"); + this.name = name; - try { - create(host.getName()); - } catch (HostNotFoundException e) { - throw new RuntimeException("The impossible happened (yet again): the host that I have were not found",e); - } + this.args = new Vector(); + if (null != args) + this.args.addAll(Arrays.asList(args)); + + this.properties = new Hashtable(); + this.startTime = startTime; + this.killTime = killTime; } /** * The natively implemented method to create an MSG process. @@ -196,48 +219,31 @@ public abstract class Process extends Thread { * */ public static native int killAll(int resetPID); - /** - * This method sets a flag to indicate that this thread must be killed. End user must use static method kill - * - * @return - * - */ - public void nativeStop() { - nativeStop = true; - } - /** - * getter for the flag that indicates that this thread must be killed - * - * @return - * - */ - public boolean getNativeStop() { - return nativeStop; - } /** * This method kill a process. - * @param process the process to be killed. * */ - public void kill() { - nativeStop(); - Msg.info("Process " + msgName() + " will be killed."); - } - + public native void kill(); /** * Suspends the process by suspending the task on which it was * waiting for the completion. - * */ - public native void pause(); + public native void suspend(); + /** + * Suspends the process by suspending the task on which it was + * waiting for the completion. + * DEPRECATED: use suspend instead. + */ + @Deprecated + public void pause() { + suspend(); + } /** * Resumes a suspended process by resuming the task on which it was * waiting for the completion. - * - * - */ - public native void restart(); + */ + public native void resume(); /** * Tests if a process is suspended. * @@ -286,6 +292,12 @@ public abstract class Process extends Thread { public int getPPID() { return ppid; } + /** + * Set the kill time of the process + * @param killTime the time when the process is killed + */ + public native void setKillTime(double killTime); + /** * This static method returns the currently running process. * @@ -293,11 +305,6 @@ public abstract class Process extends Thread { * */ public static native Process currentProcess(); - /** - * Kills a MSG process - * @param process Valid java process to kill - */ - final static native void kill(Process process); /** * Migrates a process to another host. * @@ -305,18 +312,31 @@ public abstract class Process extends Thread { * @param host The host where to migrate the process. * */ - public static void migrate(Process process, Host host) { - MsgNative.processMigrate(process, host); - process.host = null; + public native void migrate(Host host); + /** + * Makes the current process sleep until millis millisecondes have elapsed. + * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds. + * FIXME: Not optimal, maybe we should have two native functions. + * @param millis the length of time to sleep in milliseconds. + */ + public static void sleep(long millis) throws HostFailureException { + sleep(millis,0); } + /** + * Makes the current process sleep until millis milliseconds and nanos nanoseconds + * have elapsed. + * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds and nanoseconds. + * Overloads Thread.sleep. + * @param millis the length of time to sleep in milliseconds. + * @param nanos additionnal nanoseconds to sleep. + */ + public native static void sleep(long millis, int nanos) throws HostFailureException; /** * Makes the current process sleep until time seconds have elapsed. - * * @param seconds The time the current process must sleep. - * - * @exception HostFailureException on error in the native SimGrid code */ - public native void waitFor(double seconds) throws HostFailureException; /** + public native void waitFor(double seconds) throws HostFailureException; + /** * */ public void showArgs() { @@ -327,25 +347,25 @@ public abstract class Process extends Thread { "] args[" + i + "]=" + (String) (this.args.get(i))); } /** - * Exit the process + * This method actually creates and run the process. + * It is a noop if the process is already launched. + * @throws HostNotFoundException */ - public native void exit(); - + public final void start() throws HostNotFoundException { + if (!started) { + started = true; + create(host.getName()); + } + } + /** * This method runs the process. Il calls the method function that you must overwrite. */ public void run() { String[] args = null; /* do not fill it before the signal or this.args will be empty */ - //waitSignal(); /* wait for other people to fill the process in */ - - try { - schedBegin.acquire(); - } catch(InterruptedException e) { - } - try { args = new String[this.args.size()]; if (this.args.size() > 0) { @@ -353,37 +373,15 @@ public abstract class Process extends Thread { } this.main(args); - exit(); - schedEnd.release(); } catch(MsgException e) { e.printStackTrace(); Msg.info("Unexpected behavior. Stopping now"); System.exit(1); } - catch(ProcessKilled pk) { - if (nativeStop) { - try { - exit(); - } catch (ProcessKilled pk2) { - /* Ignore that other exception that *will* occur all the time. - * This is because the C mechanic gives the control to the now-killed process - * so that it does some garbage collecting on its own. When it does so here, - * the Java thread checks when starting if it's supposed to be killed (to inform - * the C world). To avoid the infinite loop or anything similar, we ignore that - * exception now. This should be ok since we ignore only a very specific exception - * class and not a generic (such as any RuntimeException). - */ - System.err.println(currentThread().getName()+": I ignore that other exception"); - } - Msg.info(" Process " + ((Process) Thread.currentThread()).msgName() + " has been killed."); - schedEnd.release(); - } - else { - pk.printStackTrace(); - Msg.info("Unexpected behavior. Stopping now"); - System.exit(1); - } - } + catch(ProcessKilledError pk) { + + } + exit(); } /** @@ -394,91 +392,7 @@ public abstract class Process extends Thread { */ public abstract void main(String[]args) throws MsgException; - - /** @brief Gives the control from the given user thread back to the maestro - * - * schedule() and unschedule() are the basis of interactions between the user threads - * (executing the user code), and the maestro thread (executing the platform models to decide - * which user thread should get executed when. Once it decided which user thread should be run - * (because the blocking action it were blocked onto are terminated in the simulated world), the - * maestro passes the control to this uthread by calling uthread.schedule() in the maestro thread - * (check its code for the simple semaphore-based synchronization schema). - * - * The uthread executes (while the maestro is blocked), until it starts another blocking - * action, such as a communication or so. In that case, uthread.unschedule() gets called from - * the user thread. - * - * As other complications, these methods are called directly by the C through a JNI upcall in - * response to the JNI downcalls done by the Java code. For example, you have this (simplified) - * execution path: - * - a process calls the Task.send() method in java - * - this calls Java_org_simgrid_msg_MsgNative_taskSend() in C through JNI - * - this ends up calling jprocess_unschedule(), still in C - * - this calls the java method "org/simgrid/msg/Process/unschedule()V" through JNI - * - that is to say, the unschedule() method that you are reading the documentation of. - * - * To understand all this, you must keep in mind that there is no difference between the C thread - * describing a process, and the Java thread doing the same. Most of the time, they are system - * threads from the kernel anyway. In the other case (such as when using green java threads when - * the OS does not provide any thread feature), I'm unsure of what happens: it's a very long time - * that I didn't see any such OS. - * - * The synchronization itself is implemented using simple semaphores in Java, as you can see by - * checking the code of these functions (and run() above). That's super simple, and thus welcome - * given the global complexity of the synchronization architecture: getting C and Java cooperate - * with regard to thread handling in a portable manner is very uneasy. A simple and straightforward - * implementation of each synchronization point is precious. - * - * But this kinda limits the system scalability. It may reveal difficult to simulate dozens of - * thousands of processes this way, both for memory limitations and for hard limits pushed by the - * system on the amount of threads and semaphores (we have 2 semaphores per user process). - * - * At time of writing, the best source of information on how to simulate large systems within the - * Java bindings of simgrid is here: http://tomp2p.net/dev/simgrid/ - * - */ - public void unschedule() { - /* this function is called from the user thread only */ - try { - - /* unlock the maestro before going to sleep */ - schedEnd.release(); - /* Here, the user thread is locked, waiting for the semaphore, and maestro executes instead */ - schedBegin.acquire(); - /* now that the semaphore is acquired, it means that maestro gave us the control back */ - - /* the user thread is starting again after giving the control to maestro. - * Let's check if we were asked to die in between */ - if ( (Thread.currentThread() instanceof Process) &&((Process) Thread.currentThread()).getNativeStop()) { - throw new ProcessKilled(); - } - - } catch (InterruptedException e) { - /* ignore this exception because this is how we get killed on process.kill or end of simulation. - * I don't like hiding exceptions this way, but fail to see any other solution - */ - } - - } - - /** @brief Gives the control from the maestro back to the given user thread - * - * Must be called from the maestro thread -- see unschedule() for details. - * - */ - public void schedule() { - try { - /* unlock the user thread before going to sleep */ - schedBegin.release(); - /* Here, maestro is locked, waiting for the schedEnd semaphore to get signaled by used thread, that executes instead */ - schedEnd.acquire(); - /* Maestro now has the control back and the user thread went to sleep gently */ - - } catch(InterruptedException e) { - throw new RuntimeException("The impossible did happend once again: I got interrupted in schedEnd.acquire()",e); - } - } - + public native void exit(); /** * Class initializer, to initialize various JNI stuff */