Example 2
Author: Ambreen Ilyas

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//// This example is from the ACE Programmers Guide.
//// Chapter: "Memory Management"
//// For details please see the guide at
//// http://www.cs.wustl.edu/~schmidt/ACE.html
//// AUTHOR: Umar Syyid (usyyid@hns.com)
//// and Ambreen Ilyas (ambreen@bitsmart.com)
/////////////////////////////////////////////////////////////////////////////////////////////////////////////

//Example 2
#include "ace/Shared_Memory_MM.h"
#include "ace/Malloc.h"
#include "ace/Malloc_T.h"
#define DATA_SIZE 100
#define MESSAGE1 "Hiya over there client process"
#define MESSAGE2 "Did you hear me the first time?"
LPCTSTR poolname="My_Pool";

typedef ACE_Malloc<ACE_SHARED_MEMORY_POOL,ACE_Null_Mutex> Malloc_Allocator;

static void
server (void){
//Create the memory allocator passing it the shared memory
//pool that you want to use
Malloc_Allocator shm_allocator(poolname);

//Create a message, allocate memory for it and bind it with
//a name so that the client can the find it in the memory
//pool
char* Message1=(char*)shm_allocator.malloc(strlen(MESSAGE1));
ACE_OS::strcpy(Message1,MESSAGE1);
shm_allocator.bind("FirstMessage",Message1);
ACE_DEBUG((LM_DEBUG,"<<%s\n",Message1));
//How about a second message
char* Message2=(char*)shm_allocator.malloc(strlen(MESSAGE2));
ACE_OS::strcpy(Message2,MESSAGE2);
shm_allocator.bind("SecondMessage",Message2);
ACE_DEBUG((LM_DEBUG,"<<%s\n",Message2));
//Set the Server to go to sleep for a while so that the client has
//a chance to do its stuff
ACE_DEBUG((LM_DEBUG,
"Server done writing.. going to sleep zzz..\n\n\n"));
ACE_OS::sleep(2);
//Get rid of all resources allocated by the server. In other
//words get rid of the shared memory pool that had been
//previously allocated
shm_allocator.remove();
}

static void
client(void){
//Create a memory allocator. Be sure that the client passes
// in the "right" name here so that both the client and the
//server use the same memory pool. We wouldnt want them to
// BOTH create different underlying pools.
Malloc_Allocator shm_allocator(poolname);

//Lets get that first message. Notice that the find is looking up the
//memory based on the "name" that was bound to it by the server.
void *Message1;
if(shm_allocator.find("FirstMessage",Message1)==-1){
ACE_ERROR((LM_ERROR,
"Client: Problem cant find data that server has sent\n"));
ACE_OS::exit(1);
}
ACE_OS::printf(">>%s\n",(char*) Message1);
ACE_OS::fflush(stdout);

//Lets get that second message now.
void *Message2;
if(shm_allocator.find("SecondMessage",Message2)==-1){
ACE_ERROR((LM_ERROR,"Client: Problem cant find data that server has sent\n"));
ACE_OS::exit(1);
}
ACE_OS::printf(">>%s\n",(char*)Message2);
ACE_OS::fflush(stdout);

ACE_DEBUG((LM_DEBUG,"Client done reading! BYE NOW\n"));
ACE_OS::fflush(stdout);
}

int main (int, char *[]){
switch (ACE_OS::fork ())
{
case -1:
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "fork"), 1);
case 0:
// Make sure the server starts up first.
ACE_OS::sleep (1);
client ();
break;
default:
server ();
break;
}
return 0;
}
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