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Use of alloca function


 
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# 22  
Old 11-02-2009
Quote:
Originally Posted by shamrock
All I m trying to say is that the value from alloca cant be returned from the function that called it.
Yes, we know this. It's stack memory. It has the same limitation as all local variables.
Quote:
Care to list some platforms where the malloc implementation isnt threadsafe...just curious btw.
I have yet to find anything which defines it as threadsafe. One of the major issues with the switch to multithreaded apache versus multiprocess apache was the thread-safety of malloc in its plugins like PHP, which is guaranteed under Windows of all things but not UNIX. Lots of people were concerned, though the issue kind of failed to destroy the world as we know it, much like this other one. Smilie
# 23  
Old 11-02-2009
Quote:
I have yet to find anything which defines it as threadsafe.
Actually, the relevant standards and specifications generally declare all APIs to be threadsafe except for a specified set which may (or may not) be threadsafe. For example, see POSIX.1-2008 S2.9.1 General Information

Cancellation points and async-cancel safety are a whole different issue and are not nearly as small a set of specified APIs.
# 24  
Old 11-02-2009
Quote:
Originally Posted by fpmurphy
Actually, the relevant standards and specifications generally declare all APIs to be threadsafe except for a specified set which may (or may not) be threadsafe. For example, see POSIX.1-2008 S2.9.1 General Information
Surprising that the maintainer of the Unix standards opengroup.org doesnt even have an entry for alloca.
# 25  
Old 11-03-2009
Quote:
Originally Posted by shamrock
Surprising that the maintainer of the Unix standards opengroup.org doesnt even have an entry for alloca.
Will you please stop harping on it? We know it's not a POSIX function already. That doesn't mean it's not portable.

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