Is malloc() function provided in <stdlib.h> thread-safe?

Hi all,
  Does anyone have experience on the thread-safty issue with malloc()?
Some people said this function provided in stdlib.h is not thread-
safe, but someone said it is thread safe.  Is it possible this
function evolves from thread-unsafe to thread-safe in recent years?
How could i find out?
  I am using the C library coming with GNU linux distribution.

thanks a lot.

tony
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