Charm++ - Example

Example

Here is some Charm++ code for demonstration purposes:

Header file (hello.h)

#ifndef __HELLO_H__ #define __HELLO_H__ class Hello : public CBase_Hello { public: /// Constructors /// Hello; Hello(CkMigrateMessage *msg); /// Entry Methods /// void sayHi(int from); }; #endif //__HELLO_H__

Interface file (hello.ci)

module hello { array Hello { entry Hello; entry void sayHi(int); }; };

Source file (hello.C)

#include "hello.decl.h" #include "hello.h" #include "main.decl.h" extern /* readonly */ CProxy_Main mainProxy; extern /* readonly */ int numElements; Hello::Hello { // Nothing to do when the Hello chare object is created. // This is where member variables would be initialized // just like in a C++ class constructor. } // Constructor needed for chare object migration (ignore for now) // NOTE: This constructor does not need to appear in the ".ci" file Hello::Hello(CkMigrateMessage *msg) { } void Hello ::sayHi(int from) { // Have this chare object say hello to the user. CkPrintf("\"Hello\" from Hello chare # %d on " "processor %d (told by %d).\n", thisIndex, CkMyPe, from); // Tell the next chare object in this array of chare objects // to also say hello. If this is the last chare object in // the array of chare objects, then tell the main chare // object to exit the program. if (thisIndex < (numElements - 1)) thisProxy.sayHi(thisIndex); else mainProxy.done; } #include "hello.def.h"