On 11/11/2023 1:25 PM, René Berber via Cygwin wrote:
On 11/11/2023 10:50 AM, Allen, Norton T. via Cygwin wrote:
[snip]
The srand function is not required to avoid data races with other
calls to pseudo-random sequence generation functions. ..."
That is not the same as "... required never to avoid data races ...".
"not required" means the sentence is not specifying--not
requiring--any behavior, so you should not depend on the described
behaviors.
[snip]
The elided part on Bruno's message is:
"The implementation shall behave as if no library function calls the
rand function."
Which is the point Bruno is making with the sample code.
I would still assert that if the implementation is doing what I
suggested (maintaining independent state for each thread) it would still
meet that criteria, although I admit it is debatable. That said, the man
page says:
"rand and srand are unsafe for multi-threaded applications. rand_r is
thread-safe and should be used instead."
I read that as "all bets are off" if you are using them in a
multi-threaded application.
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