| heap_gc behaviour [message #19552] |
Wed, 05 April 2000 00:00  |
rother
Messages: 9
Registered: April 2000
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Junior Member |
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hi!
just bothered by the spawn bug in IDL 5.3 (formatted I/O in bidirectional
pipes crashes IDL...)
I detected now a 'heap_gc' behaviour, which I don't *understand*,
but I'm *not sure* if this is a bug, an annoying feature or ...
A call of 'heap_gc' inside a routine destroys a
a heap-variable given as parameter.... ?
Yes, I have read the reference manual... but as long I understand
a call of 'heap_gc' inside a function is not forbidden.
I add here a small demonstration: a 'batch', a tiny function which is
called and the IDL messages.
any hints?
thanks in advance,
martin rother.
**** this3.pro
PRO this3, foo
;+========================================================== ===================
;
; * SCRATCH: TEST HEAP_GC ONLY *
; Sparc, Solaris, IDL 5.3
;
; input:
;
; foo pointer? to heap
; count integer counter, modify foo if zero and
; call heap_gc
;
; 00-Apr-04 Martin Rother (rother@gfz-potsdam.de).
;-========================================================== ===================
ON_ERROR, 2
print, 'have: ' & help, *foo
print, 'call garbage collection: ' & heap_gc
print, 'have: ' & help, *foo
return
END
;=========================================================== ===================
*** test3
;=========================================================== ===================
;
; TEST3
;
; 00-Apr-04
;=========================================================== ===================
.r this3.pro
;----------------------------------------------------------- ----------------
; simple heap var
;----------------------------------------------------------- ----------------
foo = ptr_new(dist(12))
;----------------------------------------------------------- ----------------
; CALL
;----------------------------------------------------------- ----------------
print, 'top level:' & help, *foo
this3, foo
print, 'top level:' & help, *foo
;=========================================================== ===================
**** IDL output:
(X). @test3
top level:
<PtrHeapVar4> FLOAT = Array[12, 12]
have:
<PtrHeapVar4> FLOAT = Array[12, 12]
call garbage collection:
have:
% Invalid pointer: FOO.
% Error occurred at: THIS3 19
/home/mt/rother/idl/Test/heap_test/this3.pro
% $MAIN$
% Execution halted at: $MAIN$
top level:
% Invalid pointer: FOO.
% Execution halted at: $MAIN$
(X).
--
Martin Rother (rother@gfz-potsdam.de) 0331/ 288-1272 Division 2.3
GeoForschungsZentrum Potsdam, Germany
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