malloc.cpp

来自「ace开发环境 用来开发网络程序 其运用了设计模式、多平台、C++等多种知识」· C++ 代码 · 共 114 行

// $Id: Malloc.cpp 72205 2006-04-20 10:20:34Z jwillemsen $

#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_string.h"

// Listing 1 code/ch17
#include "ace/MMAP_Memory_Pool.h"
#include "ace/Malloc_T.h"
#include "ace/Null_Mutex.h"

typedef ACE_Malloc<ACE_MMAP_MEMORY_POOL, ACE_Null_Mutex>
  ALLOCATOR;
typedef ACE_Malloc_LIFO_Iterator <ACE_MMAP_MEMORY_POOL,
                                  ACE_Null_Mutex>
  MALLOC_LIFO_ITERATOR;

ALLOCATOR  *g_allocator;
// Listing 1

// Listing 2 code/ch17
class Record
{
public:
  Record (int id1, int id2, char *name)
    : id1_(id1), id2_(id2), name_(0)
  {
    size_t len = ACE_OS::strlen (name) + 1;
    this->name_ =
      reinterpret_cast<char *> (g_allocator->malloc (len));
    ACE_OS::strcpy (this->name_, name);
  }

  ~Record () { g_allocator->free (name_); }
  char* name(void) { return name_; }
  int id1 (void) { return id1_; }
  int id2 (void) { return id2_; }

private:
  int id1_;
  int id2_;
  char *name_;
};
// Listing 2
// Listing 5 code/ch17
void showRecords ()
{
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("The following records were found:\n")));
  {
    MALLOC_LIFO_ITERATOR iter (*g_allocator);

    for (void *temp = 0; iter.next (temp) != 0; iter.advance ())
      {
        Record *record =
          reinterpret_cast<Record *> (temp);
        ACE_DEBUG ((LM_DEBUG,
                    ACE_TEXT ("Record name: %C|id1:%d|id2:%d\n"),
                    record->name (),
                    record->id1 (),
                    record->id2 ()));
      }
  }
}
// Listing 5
// Listing 3 code/ch17
int addRecords ()
{
  char buf[32];

  for (int i = 0; i < 10; i++)
    {
      ACE_OS::sprintf (buf, "%s:%d", "Record", i);
      void *memory = g_allocator->malloc (sizeof (Record));
      if (memory == 0)
        ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
                           ACE_TEXT ("Unable to malloc")),
                          -1);

      // Allocate and place record
      Record* newRecord = new (memory) Record (i, i+1, buf);
      if (g_allocator->bind (buf, newRecord) == -1)
        ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
                           ACE_TEXT ("bind failed")),
                          -1);
    }

  return 0;
}
// Listing 3
// Listing 4 code/ch17
// Backing file where the data is kept.
#define BACKING_STORE ACE_TEXT("backing.store")

int ACE_TMAIN (int argc, ACE_TCHAR *[])
{
  ACE_NEW_RETURN (g_allocator,
                  ALLOCATOR (BACKING_STORE),
                  -1);
  if (argc > 1)
    {
      showRecords ();
    }
  else
    {
      addRecords ();
    }

  g_allocator->sync ();
  delete g_allocator;
  return 0;
}
// Listing 4