<HTML> <!-- ex02.html,v 1.2 2000/06/04 22:02:08 brunsch Exp --> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Ambreen Ilyas"> <META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (X11; I; SunOS 5.5.1 sun4u) [Netscape]"> <TITLE>Example 2</TITLE> </HEAD> <BODY> <FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT> <BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers Guide.</FONT> <BR><FONT COLOR="#CC0000">//// Chapter: "Memory Management"</FONT> <BR><FONT COLOR="#CC0000">//// For details please see the guide at</FONT> <BR><FONT COLOR="#CC0000">//// http://www.cs.wustl.edu/~schmidt/ACE.html</FONT> <BR><FONT COLOR="#CC0000">//// AUTHOR: Umar Syyid (usyyid@hns.com)</FONT> <BR><FONT COLOR="#CC0000">//// and Ambreen Ilyas (ambreen@bitsmart.com)</FONT> <BR><FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT> <P><FONT COLOR="#CC0000">//Example 2</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Shared_Memory_MM.h"</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Malloc.h"</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Malloc_T.h"</FONT> <BR><FONT COLOR="#000099">#define </FONT><FONT COLOR="#663366">DATA_SIZE 100</FONT> <BR><FONT COLOR="#000099">#define</FONT><FONT COLOR="#663366"> MESSAGE1 "Hiya over there client process"</FONT> <BR><FONT COLOR="#000099">#define </FONT><FONT COLOR="#663366">MESSAGE2 "Did you hear me the first time?"</FONT> <BR>LPCTSTR poolname="My_Pool"; <P><FONT COLOR="#000000">typedef ACE_Malloc<ACE_SHARED_MEMORY_POOL,ACE_Null_Mutex> Malloc_Allocator;</FONT> <P>static void <BR>server (void){ <BR> <FONT COLOR="#FF0000">//Create the memory allocator passing it the shared memory</FONT> <BR> <FONT COLOR="#FF0000">//pool that you want to use</FONT> <BR> Malloc_Allocator shm_allocator(poolname); <P> <FONT COLOR="#FF0000">//Create a message, allocate memory for it and bind it with</FONT> <BR><FONT COLOR="#FF0000"> //a name so that the client can the find it in the memory</FONT> <BR><FONT COLOR="#FF0000"> //pool</FONT> <BR> char* Message1=(char*)shm_allocator.malloc(strlen(MESSAGE1)); <BR> ACE_OS::strcpy(Message1,MESSAGE1); <BR> shm_allocator.bind("FirstMessage",Message1); <BR> ACE_DEBUG((LM_DEBUG,"<<%s\n",Message1)); <BR> <BR><FONT COLOR="#FF0000"> //How about a second message</FONT> <BR> char* Message2=(char*)shm_allocator.malloc(strlen(MESSAGE2)); <BR> ACE_OS::strcpy(Message2,MESSAGE2); <BR> shm_allocator.bind("SecondMessage",Message2); <BR> ACE_DEBUG((LM_DEBUG,"<<%s\n",Message2)); <BR> <BR> <FONT COLOR="#FF0000">//Set the Server to go to sleep for a while so that the client has</FONT> <BR><FONT COLOR="#FF0000"> //a chance to do its stuff</FONT> <BR> ACE_DEBUG((LM_DEBUG, <BR> "Server done writing.. going to sleep zzz..\n\n\n")); <BR> ACE_OS::sleep(2); <BR> <BR><FONT COLOR="#FF0000"> //Get rid of all resources allocated by the server. In other</FONT> <BR><FONT COLOR="#FF0000"> //words get rid of the shared memory pool that had been</FONT> <BR><FONT COLOR="#FF0000"> //previously allocated</FONT> <BR> shm_allocator.remove(); <BR> <BR>} <BR> <P>static void <BR>client(void){ <BR> <FONT COLOR="#FF0000">//Create a memory allocator. Be sure that the client passes</FONT> <BR><FONT COLOR="#FF0000"> // in the "right" name here so that both the client and the</FONT> <BR><FONT COLOR="#FF0000"> //server use the same memory pool. We wouldnt want them to</FONT> <BR><FONT COLOR="#FF0000"> // BOTH create different underlying pools.</FONT> <BR> Malloc_Allocator shm_allocator(poolname); <P><FONT COLOR="#FF0000"> //Lets get that first message. Notice that the find is looking up the</FONT> <BR><FONT COLOR="#FF0000"> //memory based on the "name" that was bound to it by the server.</FONT> <BR> void *Message1; <BR> if(shm_allocator.find("FirstMessage",Message1)==-1){ <BR> ACE_ERROR((LM_ERROR, <BR> "Client: Problem cant find data that server has sent\n")); <BR> ACE_OS::exit(1); <BR> } <BR> ACE_OS::printf(">>%s\n",(char*) Message1); <BR> ACE_OS::fflush(stdout); <P> <FONT COLOR="#FF0000">//Lets get that second message now.</FONT> <BR> void *Message2; <BR> if(shm_allocator.find("SecondMessage",Message2)==-1){ <BR> ACE_ERROR((LM_ERROR,"Client: Problem cant find data that server has sent\n")); <BR> ACE_OS::exit(1); <BR> } <BR> ACE_OS::printf(">>%s\n",(char*)Message2); <BR> ACE_OS::fflush(stdout); <P> ACE_DEBUG((LM_DEBUG,"Client done reading! BYE NOW\n")); <BR> ACE_OS::fflush(stdout); <BR>} <BR> <P>int main (int, char *[]){ <BR>switch (ACE_OS::fork ()) <BR> { <BR> case -1: <BR> ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "fork"), 1); <BR> case 0: <BR> <FONT COLOR="#FF0000"> // Make sure the server starts up first.</FONT> <BR> ACE_OS::sleep (1); <BR> client (); <BR> break; <BR> default: <BR> server (); <BR> break; <BR> } <BR> return 0; <BR>} <BR> <BR> <A HREF="../Chap_4/ex01.html">Next Example</A> </BODY> </HTML>