Thread safe functions from the C standard library

[David Livshin]

Hi,

What functions from the GNU's C standard libraries ( libc, libm ) are 
thread safe? Of a particular interest are transcendental functions ( 
like 'exp', 'sin' etc. ) - are they thread safe?

Are there any requirements/guidelines/assurances regarding thread safety 
of functions from a C library?

Thanks in advance.

-- 
David Livshin

http://www.dalsoft.com