X10 X10.lang.FailedDynamicCheckException:!(这里==x$0.home)C++;后端
我目前正在使用X10,并且有多个异常。这是我创建的代码: Main.x10X10 X10.lang.FailedDynamicCheckException:!(这里==x$0.home)C++;后端,exception,x10-language,Exception,X10 Language,我目前正在使用X10,并且有多个异常。这是我创建的代码: Main.x10 public class Main { // main Method for the Main class public static def main(argv:Rail[String]) { Console.OUT.println("This is the main place. (ID="+here.id+")"); val dataItem = new Data(); // no glo
public class Main {
// main Method for the Main class
public static def main(argv:Rail[String]) {
Console.OUT.println("This is the main place. (ID="+here.id+")");
val dataItem = new Data();
// no global reference, data is copied to each place.
finish for (p in Place.places()) {
at (p) async {
Console.OUT.println("This is place no: "+here.id+". The value of dataItem is "+dataItem.getValue()+".");
dataItem.incValue();
}
}
Console.OUT.println("Final value of dataItem without GlobalRef in multiple places at place "+here.id+": "+dataItem.getValue());
dataItem.setValue(0);
finish for (p in Place.places()) {
async {
Console.OUT.println("This is place no: "+here.id+". The value of dataItem is "+dataItem.getValue()+".");
dataItem.incValue();
}
}
Console.OUT.println("Final value of dataItem without GlobalRef in one place at place "+here.id+": "+dataItem.getValue());
dataItem.setValue(0);
val globalRefDataItem = GlobalRef[Data](dataItem);
finish for (p in Place.places()) {
at (p) async {
val globalDataItemUnwrapped = globalRefDataItem();
Console.OUT.println("This is place no: "+here.id+". The value of dataItem is "+globalDataItemUnwrapped.getValue()+".");
atomic globalDataItemUnwrapped.incValue();
}
}
Console.OUT.println("Final value of dataItem with GlobalRef in multiple places at place "+here.id+": "+dataItem.getValue());
}
}
Data.x10
public class Data{
private var value:Long;
def getValue():Long{
return value;
}
def setValue(value:long){
this.value = value;
}
def incValue(){
this.value = this.value+1;
}
}
X10DT的输出如下所示:
This is the main place. (ID=0)
This is place no: 3. The value of dataItem is 0.
This is place no: 1. The value of dataItem is 0.
This is place no: 2. The value of dataItem is 0.
This is place no: 0. The value of dataItem is 0.
Final value of dataItem without GlobalRef in multiple places at place 0: 0
This is place no: 0. The value of dataItem is 0.
This is place no: 0. The value of dataItem is 1.
This is place no: 0. The value of dataItem is 2.
This is place no: 0. The value of dataItem is 3.
Final value of dataItem without GlobalRef in one place at place 0: 4
This is place no: 0. The value of dataItem is 0.
Command used: /home/martze/x10dt/workspace/Example/bin/Main
Uncaught exception at place 0: x10.lang.MultipleExceptions
x10.lang.FailedDynamicCheckException: !(here == x$0.home)
at x10aux::throwException(x10::lang::CheckedThrowable*)
at Main__closure__3::__apply()
at x10::lang::Activity::run()
at x10::lang::Runtime__Worker::loop()
at x10::lang::Runtime__Worker::__apply()
at x10::lang::Runtime__Pool::run()
at
at GC_inner_start_routine
at GC_call_with_stack_base
at
at clone
x10.lang.FailedDynamicCheckException: !(here == x$0.home)
at x10aux::throwException(x10::lang::CheckedThrowable*)
at Main__closure__3::__apply()
at x10::lang::Activity::run()
at x10::lang::Runtime__Worker::loop()
at x10::lang::Runtime__Worker::__apply()
at x10::lang::Runtime__Pool::run()
at
at GC_inner_start_routine
at GC_call_with_stack_base
at
at clone
x10.lang.FailedDynamicCheckException: !(here == x$0.home)
at x10aux::throwException(x10::lang::CheckedThrowable*)
at Main__closure__3::__apply()
at x10::lang::Activity::run()
at x10::lang::Runtime__Worker::loop()
at x10::lang::Runtime__Worker::__apply()
at x10::lang::Runtime__Pool::run()
at
at GC_inner_start_routine
at GC_call_with_stack_base
at
at clone
我试着用谷歌搜索,但结果只是指向一些对我毫无帮助的文档。我的环境变量设置为X10\u NTHREADS=1,我将位置数设置为4。我正在使用Ubuntu,我使用C++后端。< /P>
如何处理此错误以及此错误的含义是什么?A
GlobalRef
是对特定位置的对象的具有全局意义的引用。它只能在创建它的位置(“主”位置)取消引用。在GlobalRef
的解引用(“展开”)时引发异常:
val globalRefDataItem = GlobalRef[Data](dataItem);
finish for (p in Place.places()) {
at (p) async {
val globalDataItemUnwrapped = globalRefDataItem();
...
}
}
GlobalRef
是在位置0处创建的,但正在位置p
处取消引用(globalRefDataItem()
)。如果该错误为:
x10.lang.FailedDynamicCheckException: (here != globalRefDataItem.home)
要访问由GlobalRef
引用的对象,活动必须将地点更改回起始地点。例如:
val globalRefDataItem = GlobalRef[Data](dataItem);
finish for (p in Place.places()) {
at (p) async {
at(globalRefDataItem.home) {
atomic globalDataItemUnwrapped.incValue();
}
}
}
finish for (p in Place.places()) {
at (p) async {
val currentValue = at(globalRefDataItem.home) {
val globalDataItemUnwrapped = globalRefDataItem();
var valueBeforeInc:Long = 0;
atomic {
valueBeforeInc = globalDataItemUnwrapped.getValue();
globalDataItemUnwrapped.incValue();
}
valueBeforeInc
};
Console.OUT.println("This is place no: "+here.id+". The value of dataItem is "+currentValue+".");
}
}
这通常被称为“乒乓球”习语——活动变为一个遥远的地方,然后又变回原来的地方
在您的程序中,增加了一项要求,即在增加数据项之前打印数据项的值。为此,使用at表达式(§13.3)从远程位置返回值,例如:
val globalRefDataItem = GlobalRef[Data](dataItem);
finish for (p in Place.places()) {
at (p) async {
at(globalRefDataItem.home) {
atomic globalDataItemUnwrapped.incValue();
}
}
}
finish for (p in Place.places()) {
at (p) async {
val currentValue = at(globalRefDataItem.home) {
val globalDataItemUnwrapped = globalRefDataItem();
var valueBeforeInc:Long = 0;
atomic {
valueBeforeInc = globalDataItemUnwrapped.getValue();
globalDataItemUnwrapped.incValue();
}
valueBeforeInc
};
Console.OUT.println("This is place no: "+here.id+". The value of dataItem is "+currentValue+".");
}
}
注意,我对原始代码做了一个重要的更改,将get和值的增量合并到一个
原子块中。如果没有此更改,另一个活动可能会增加这两条语句之间的值。X10提供了原子类型(例如X10.util.concurrent.AtomicLong
),它提供了这样一个原子getAndIncrement
操作。好的。这是有道理的。但是,有没有一种方法可以在远程位置执行活动,同时访问另一个位置的数据?用乒乓球的习惯用语来说,这不是把数据复制到一个遥远的地方和后面,然后工作吗?听起来很奇怪。一般来说,活动只能访问驻留在当前位置的数据。当一个GlobalRef
被发送到一个远程位置时,实际发送的只是一个在本地有意义的标识符(如指针);未复制实际目标对象。因此,在乒乓球中,标识符被发送到位置p
,然后返回到起始位置。