objective c - Does detachNewThreadSelector work any different than NSThread performSelectorInBackground or NSThread alloc/init then [thread start] -

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does detachnewthreadselector work different performselectorinbackground? in project use lot of this:

[self performselectorinbackground:@selector(startimagedownloads:) withobject:[nsnumber numberwithint:datatype]];

but doing different:

[nsthread detachnewthreadselector:@selector(startimagedownloads:) totarget:self withobject:[nsnumber numberwithint:datatype]];

and also, besides being able access thread object imgdlthread, alloc/init'ing thread starting work different first 2:

nsthread *imgdlthread = [[nsthread alloc] initwithtarget:self selector:@selector(startimagedownloads:) object:[nsnumber numberwithint:datatype]]; [imgdlthread start];

thanks!

edit:

just realized there's several answers on difference (or lack of) between performselectorinbackground , detachnewthreadselector, guess question is:

is allocating , initializing nsthread calling [thread start] different first 2?

the difference between third method , first 2 memory management. when allocate thread, retains it's target, released when thread deallocated. detatchnewthreadselector: , performselectorinbackground: method both autorelease resulting nsthread created, meaning that, once thread finishes execution, target released.

in code provided (allocate thread , start it), leaking imgdlthread, meaning target never released, , in turn leaked itself. if autorelease or regular release imgdlthread after starting it, have exact same effect detachnewthreadselector:.


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