Am 21.08.2012 09:52, schrieb Thiago Macieira:
On segunda-feira, 20 de agosto de 2012 17.31.27, John Weeks wrote:On 20-Aug-2012, at 4:20 PM, Thiago Macieira wrote:In any case, if the application needs memory and can't get it, what do you suggest it do?You put up an alert telling the user that the operation can't be completed due to insufficient memory,How? Putting up an alert usually requires allocating memory somewhere, be it in your application or in the display server.
Look at the various solutions used as "new handlers". For example, you could pre-allocate some amount of memory and an open file handle / some NVRAM space / ... for "panic actions".
If we're already out of memory, the likelihood of another set of allocations succeeding is quite low. Not to mention that, by the time you do run out of memory, the chances are that the system has been swapping hard for several minutes. The user will have likely pressed the Reset button long ago.
On systems that support swap space, this may hold true - as long as the system is not configured to use none...
For safety critical systems, these definitely are issues to address - if Qt is a suitable framework for these kind of applications is a different topic...
Back on topic: There are third party memory allocators for various purposes that might do a better job than the one bundled with the OS. But the gap narrows.
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