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Message: [QUOTE="breitkreutz_travis_o, post: 1692513"] The standard provides for atomic access through use of the type sig_atomic_t in signal.h, which is "the (possibly volatile-qualified) integer type of an object that can be accessed as an atomic entity, even in the presence of asynchronous interrupts." (ISO/IEC 9899:1999, clause 7.14, p. 245.) However, the standard also states that "[w]hat constitutes an access to an object that has volatile-qualified type is implementation-defined." (Ibid., clause 6.7.3, p. 109.) Read access on such an object is usually straightforward and is normally done in one atomic operation if the memory is on-chip. Write access, however, may or may not be done in one operation. In either case, access is hardware- specific. In short, there is no portable means of providing a mutex, at least not one that is completely reliable across all platforms. Regards, Travis [/QUOTE]