Re: Memory Leak
Re: Memory Leak
- Subject: Re: Memory Leak
- From: Horst Hoesel <email@hidden>
- Date: Tue, 27 May 2008 15:57:45 +0200
[snip]
On exit, the original author had written the code such that it
*explicitly* called the destructors for all the widgets he'd
created.
When the user clicked the exit button, the app would take 20~30
seconds
to close, and at least one of the CPU's would max out during this
time.
The code was modified to *not* explicitly call the destructors.
Thereafter, when the user clicked the exit button, the app would
terminate "straight away", with no CPU maxing out.
[snip]
In general when an OS (Mac OS X, Windows, Linux, ...) terminates a
process no destructors are called. The OS reclaims assigned memory
at a different/lower level than release, dealloc, free (or
whatever your runtime model uses). So unless the destructores do
things like saving object/program/data/preference state
information to disk or tear down network connections orderly,
there is no need to call them prior to program exit.
That said, it is good practice to call the destructors on exit,
since not doing so implies the knowledge that there are no
preferences to save, network connections to close, ...
HTH,
Horst
Or just have one method that is call on exit and know what it
should save or/and close, so the OS will not have to call thousand
of useless destructors. (like -applicationWillTerminate: in Cocoa).
FWIW, the OS does not call destructors.
A WillTerminate-contract is certainly a good way to avoid calling
tons of needless destructors. My point is the nature of contracts:
everybody involved (the gadgets and the app) knows the contract and
hence does not expect the destructor to be called at exit time. Once
the contract is established and all gadgets comply all is well.
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