On Dec 6, 2011, at 4:02 PM, Greg Parker wrote: > On Dec 6, 2011, at 12:47 PM, Larry Campbell wrote: >> (Mac OS X 10.6.8, Xcode 4.0.2, no GC) >> >> I believe the following paragraph in the "Using Autorelease Pools" section >> of the "Memory Management Programming Guide" is wrong, or misleading: >> >> "This behavior has implications for exceptional conditions. If an exception >> occurs, and the thread suddenly transfers out of the current context, the >> pool associated with that context is drained. However, if that pool is not >> the top pool on the thread’s stack, all the pools above the drained pool are >> also drained (releasing all their objects in the process). The top >> autorelease pool on the thread’s stack then becomes the pool previously >> underneath the drained pool associated with the exceptional condition. >> Because of this behavior, exception handlers do not need to release objects >> that were sent autorelease. Neither is it necessary or even desirable for an >> exception handler to send release to its autorelease pool, unless the >> handler is re-raising the exception." >> >> In the following test program, if you leave the #define LEAK uncommented, >> the program leaks. Why? Is the above paragraph just wrong? Or am I missing >> something? > > What does Instruments say the leaked objects are?
Instruments claims there are no leaks. However, the heap grows and grows (as reported by malloc_zone_statistics). > With NSAutoreleasePool, the autoreleased objects are handled correctly but > the NSAutoreleasePool object itself leaks. In practice this is rarely > noticed, because exceptions are uncommon and the NSAutoreleasePool object is > small. It still shouldn't leak. Exceptions are not necessarily uncommon, and in a long-running program any leaks are bad. > @autoreleasepool does not leak. For portability reasons I cannot use Objective-C 2.0. - lc
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