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CodeBlocksPortable/WATCOM/samples/clibexam/setnew.c

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#include <stdio.h>
#include <new.h>
#if defined(__386__)
const size_t MemBlock = 8192;
#else
const size_t MemBlock = 2048;
#endif
/*
Pre-allocate a memory block for demonstration
purposes. The out-of-memory handler will return
it to the system so that "new" can use it.
*/
long *failsafe = new long[MemBlock];
/*
Declare a customized function to handle memory
allocation failure.
*/
int out_of_memory_handler( unsigned size )
{
printf( "Allocation failed, " );
printf( "%u bytes not available.\n", size );
/* Release pre-allocated memory if we can */
if( failsafe == NULL ) {
printf( "Halting allocation.\n" );
/* Tell new to stop allocation attempts */
return( 0 );
} else {
delete failsafe;
failsafe = NULL;
printf( "Retrying allocation.\n" );
/* Tell new to retry allocation attempt */
return( 1 );
}
}
void main( void )
{
int i;
/* Register existence of a new memory handler */
_set_new_handler( out_of_memory_handler );
long *pmemdump = new long[MemBlock];
for( i=1 ; pmemdump != NULL; i++ ) {
pmemdump = new long[MemBlock];
if( pmemdump != NULL )
printf( "Another block allocated %d\n", i );
}
}