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another thread question

arie zwijnsma
Greenhorn

Joined: Jul 28, 2001
Posts: 5

suppose 2 threads are concurrently using the same integer m_i.
as in m_i++; or if ( m_i == 1 ) or j = m_i%2==0?m_i:-1
i am wondering are these statements thread safe 'on their own' ???
i mean is it possible that the os switches to the 2nd thread when
the 1st thread has not yet finished the statement it was working on ?
(see also code below)
thanks arie.
tvs sundaram
Ranch Hand

Joined: Jan 28, 2001
Posts: 153
volatile.??!!!
Manfred Leonhardt
Ranch Hand

Joined: Jan 09, 2001
Posts: 1492
Hi Arie,
I would say that the statements ARE NOT thread safe because it is quite possible for a time-sharing thread handler to remove one thread when its' time is up and it has not completely finsihed the statement. Since thread handling is up to each vendor you can never be completely sure what will happen to threads.
Regards,
Manfred.
 
 
subject: another thread question
 
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