On Tue, Sep 18, 2012 at 12:43 PM, Liviu Nicoara <[email protected]> wrote:
> I am attaching a test program which, while 100% MT-safe, is flagged by
> the Solaris thread analyzer.
The program as written is not thread safe. It is reading the value of
the counter variable and performing a zero comparison outside of a
mutex lock:
for (size_t i = 0; i < nloops; ++i) {
if (counter == 0) { // <----------- !!!!
pthread_mutex_lock (&lock);
if (counter == 0)
++counter;
pthread_mutex_unlock (&lock);
}
else {
// counter value is safe to use here
}
}
--
Stefan Teleman
KDE e.V.
[email protected]
