void
OS_free (void * ptr)
{
malloc_header_t * header = (guarantee_valid_malloc_pointer (ptr));
APIRET rc;
(header -> check) = 0;
rc = (DosSubFreeMem (malloc_object, header, (header -> size)));
if (rc != NO_ERROR)
{
char buffer [1024];
sprintf (buffer, "DosSubFreeMem error: %d.", rc);
OS2_logic_error (buffer);
}
}
int main (VOID)
{
PVOID pvMemBase = NULL; /* Pointer to memory object (pool)*/
PVOID apvBlock[NUMBLOCKS] = {NULL}; /* Pointers to memory blocks */
ULONG i = 0; /* A loop index */
APIRET rc = NO_ERROR; /* Return code */
/* Allocate the memory pool. Note the pool is intentionally NOT
committed here. OS/2 will commit the memory as needed. */
rc = DosAllocMem( &pvMemBase, POOLSIZE, PAG_WRITE );
if (rc != NO_ERROR) {
printf("DosAllocMem error: return code = %u\n", rc);
return 1;
}
/* Make the entire memory object available for Suballocation */
rc = DosSubSetMem( pvMemBase, DOSSUB_INIT | DOSSUB_SPARSE_OBJ, POOLSIZE );
if (rc != NO_ERROR) {
printf("DosSubSetMem error: return code = %u\n", rc);
return 1;
} else { printf("Memory object ready for suballocation.\n"); }
/* Suballocate the pool into 128 memory blocks, each 80 bytes in size */
for( i = 0; i < NUMBLOCKS; i++ ) {
rc = DosSubAllocMem( pvMemBase, &apvBlock[ i ], 80 );
if( rc != NO_ERROR ) {
printf( "DosSubAllocMem error: return code = %u (i = %u)\n", rc, i );
break; }
}
/* USE THE POOL HERE... */
/* When done, free the 128 memory blocks */
do {
rc = DosSubFreeMem( pvMemBase, apvBlock[ --i ], 80 );
if (rc != NO_ERROR) {
printf("DosSubFreeMem error: return code = %u (i = %u)\n", rc, i);
return 1;
}
} while( i );
/* Stop memory block management, and free the memory object */
rc = DosSubUnsetMem( pvMemBase );
if (rc != NO_ERROR) {
printf("DosSubUnsetMem error: return code = %u\n", rc);
return 1;
}
rc = DosFreeMem( pvMemBase );
if (rc != NO_ERROR) {
printf("DosFreeMem error: return code = %u\n", rc);
return 1;
} else {
printf("Memory freed.\n");
}
return NO_ERROR;
}
static void heapDecrease(Heap_t uhp, PVOID p, size_t size)
{
logwrite("decreaseHeap - size : %8u\n", size, 0);
DosSubFreeMem(pbasemem, p, size);
}
