table.cc

linux的例子,就是下载后到自己的机子上去运行

#include"Table.h"
#include"system.h"
#include"thread.h"

Table::Table(int size)
{
    tablesize = size;
    number = 0;
    table = new void*[size]();
    lock = new Lock("table lock");
}

Table::~Table()
{
    delete table;
    delete lock;
}

int
Table::Alloc(void *object)
{
    int i = -1;
    lock->Acquire();
    if( number < tablesize )
    {
  	while ( table[i] != NULL){
	   ++i;
	   currentThread->Yield();
        }
	table[i] = object;
        ++number;
    }
    lock->Release();
    return i;
}

void *
Table::Get(int index)
{
    void *pointer;
    lock->Acquire();
    pointer = table[index];
    lock->Release();
    return pointer;
}

void
Table::Release(int index)
{
    void * pointer;
    lock->Acquire();
    if ( number > 0 ){
	pointer = table[index];
        if( pointer != NULL ) {
	    --number;
	    table[index] = NULL;
	}
    }
    lock->Release();
}