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<HTML>
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<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 1</TITLE>
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<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 1 </FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Malloc.h"</FONT>
<BR><FONT COLOR="#FF0000">//A chunk of size 1K is created</FONT>
<BR><FONT COLOR="#000099">typedef</FONT> <FONT COLOR="#993300">char</FONT><FONT COLOR="#666600">
MEMORY_BLOCK[1024];</FONT>
<BR>
<BR>
<P><FONT COLOR="#FF0000">//Create an ACE_Cached_Allocator which is passed
in the type of the</FONT>
<BR><FONT COLOR="#FF0000">//chunk that it must pre-allocate and assign
on the free</FONT>
<BR><FONT COLOR="#FF0000">//list</FONT>
<BR><FONT COLOR="#000000">typedef ACE_Cached_Allocator<MEMORY_BLOCK,ACE_SYNCH_MUTEX>
Allocator;</FONT>
<BR>
<BR>class MessageManager{
<BR>public:
<BR><FONT COLOR="#FF0000">//The constructor is passed the number of chunks
that the allocator should pre-allocate //and maintain on its free list.</FONT>
<BR>MessageManager(int n_blocks):
<BR> allocator_(n_blocks),message_count_(0){}
<P><FONT COLOR="#FF0000">//Allocate memory for a message using the Allocator</FONT>
<BR>void allocate_msg(const char *msg){
<BR> mesg_array_[message_count_]=
<BR> (char*)allocator_.malloc(ACE_OS::strlen(msg));
<BR> ACE_OS::strcpy(mesg_array_[message_count_],msg);
<BR> message_count_++;
<BR> }
<P><FONT COLOR="#FF0000">//Free all memory allocated. This will cause the
chunks to be returned</FONT>
<BR><FONT COLOR="#FF0000">//to the allocators internal free list and NOT
to the OS.</FONT>
<BR>void free_all_msg(){
<BR> for(int i=0;i<message_count_;i++)
<BR> allocator_.free(mesg_array_[i]);
<BR> message_count_=0;
<BR> }
<BR>void display_all_msg(){
<BR> for(int i=0;i<message_count_;i++)
<BR> ACE_OS::printf("%s\n",mesg_array_[i]);
<BR> }
<BR>
<BR>private:
<BR> char *mesg_array_[20];
<BR> Allocator allocator_;
<BR> int message_count_;
<BR>};
<BR>
<P>int main(int argc, char* argv[]){
<P>if(argc<2){
<BR> ACE_OS::printf("Usage: egXX <Number of blocks>\n");
<BR> exit(1);
<BR> }
<BR>
<BR><FONT COLOR="#FF0000">//Instatiate the Memory Manager class</FONT>
<BR>int n_blocks=ACE_OS::atoi(argv[1]);
<BR>MessageManager mm(n_blocks);
<BR>
<P><FONT COLOR="#FF0000">//Use the Memory Manager class to assign messages
and free them.</FONT> <FONT COLOR="#FF0000">Run this in your</FONT>
<BR><FONT COLOR="#FF0000">//debug environment and you will notice that
//the</FONT> <FONT COLOR="#FF0000">amount of memory your program uses</FONT>
<BR><FONT COLOR="#FF0000">//after Memory Manager has been</FONT> <FONT COLOR="#FF0000">instantiated
remains the same. That means the</FONT>
<BR><FONT COLOR="#FF0000">//Cached Allocator</FONT> <FONT COLOR="#FF0000">controls
or manages all the memory for the application.</FONT>
<P><FONT COLOR="#FF0000">//Do forever.</FONT>
<BR>while(1){
<BR> <FONT COLOR="#FF0000">//allocate the messages somewhere</FONT>
<BR> for(int i=0; i<n_blocks;i++)
<BR> mm.allocate_msg("Hi there");
<BR> <FONT COLOR="#FF0000">//show the messages</FONT>
<BR> mm.display_all_msg();
<BR>
<BR> for( i=0;i<n_blocks;i++)
<BR> mm.free_all_msg();
<BR> }
<BR>}
<P> <A HREF="ex02.html">Next Example</A>
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