"
COPYRIGHT (c) 2003 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libbasic' }"
ExternalBytes subclass:#MappedExternalBytes
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'System-Support'
!
!MappedExternalBytes class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2003 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
Much like externalBytes - however, instances of MappedExternalBytes are created
by mapping virtual memory (i.e. mmap).
For now, this class provides only the minimum required protocol to support
the VideoForLinux API for video grabbing.
(actually, all that is found here is a redefined finalization method, as my instances
must be freed by unmapping the underlying memory, as opposed to instances of my superclass,
which must be freed w.r.t. malloc).
More will (might be required) be added in the future.
[authors:]
Claus Gittinger
"
! !
!MappedExternalBytes methodsFor:'freeing'!
finalize
"some MappedExternalBytes object was finalized;
free the associated heap memory with it"
%{ /* NOCONTEXT */
#if defined(HAS_MMAP)
char *_mem = (char *)(__INST(address_));
OBJ sz = __INST(size);
# ifdef SUPERDEBUG
console_fprintf(stderr, "MappedExternalBytes finalize\n");
# endif
if (__isSmallInteger(sz)) {
if (_mem && (OBJ)_mem != nil) {
# ifdef SUPERDEBUG
console_fprintf(stderr, "MappedExternalBytes munmap (%x, %d)\n", _mem, __intVal(sz));
# endif
munmap (_mem, __intVal(sz));
}
__INST(address_) = __INST(size) = nil;
}
#endif /* HAS_MMAP */
%}
! !
!MappedExternalBytes class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/MappedExternalBytes.st,v 1.3 2007-02-22 15:27:19 cg Exp $'
! !