>> void foo(void)
>> {
>> static int *my_errno=NULL;
>> if(my_errno==NULL) my_errno=errno;
>> // code that uses 'my_errno' as if it were 'errno'
>> }
> No, this is not legal code under the POSIX standard at all.
Since this code is single-threaded only, what POSIX standard are you talking
about? The pthreads standard doesn't apply.
In any event, provided the code is compiled single-threaded and
thread-safety has not been asked for, it's a perfectly legal compiler
optimization under the 'as-if' rule. No compliant code could ever tell the
difference.
Remember, I was not suggesting anyone actually write this code. I was
suggesting it was a legal compiler optimization so long as the code was not
compiled multi-threaded.
My point is very similar, nothing requires the platform to generate
thread-safe code if you don't ask it to. If it just happens to, it's purely
by accident.
DS
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