[Bug ports/11291] potential deadlock in sem_*wait and sem_post for MIPS architectures

["mischa dot jonker at viragelogic dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From mischa dot jonker at viragelogic dot com  2010-02-17 17:56 -------
Indeed, the + is missing. This could cause statements after the macro to read a 
value from before the macro (as the compiler doesn't expect the macro to change it 
without the +, and therefore might use some old value stored in a register). 

But this is all within the same thread/instance: it doesn't fix the problem. What 
if a different thread changes isem->value?? The only way to tell the compiler 
(that I know of I must say;-)) is by means of the 'volatile' keyword.

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http://sourceware.org/bugzilla/show_bug.cgi?id=11291

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