Daniel Rodrick escribió:
Hi,
Can some body please confirm my understanding?
"Reentrant code" is a piece of code that could be simultaneously
running by multiple threads of execution. (either via SMP, or via
preemption on uniprocessor machines)
Not exactly... A "reentrant code" is a piece of code that is prepared to
be accesed simultaneously by multiple threads of execution. The keyword
is to be prepared.
"Critical Section" is a piece of code that can be running by only one
thread of execution at a time ( If one thread enters critical section
on one processor, no other thread will enter critical section, even on
another processor).
"Critical section" is a piece of code that can cause (for example) race
conditions in case of being accesed simultaneously by multiple threads
of execution. Critical sections should therefor be protected against this.
"Atomic Section" is a piece of code that if starts running on a
processor, then it can't be preempted untill the atomic section is
exited. (it is however possible that the same atomic section is being
run simultaneously on a different processor by a different thread).
More or less.
In that sense "Reentrant Code" seems to be just the opposite of
"Critical Section". Is this right?
I would not consider them as opposite.
Thanks,
Dan
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