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By adding the volatile qualifier, i is guaranteed to be accessed from it its original address for every iteration of the while loop.
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Failing to use the volatile qualifier can result in race conditions in asynchronous portions of the code, causing unexpected values to be stored , and leading to possible data integrity violations.
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.7.3, "Type qualifiers,"; and Section 7.14, "Signal handling <signal.h>" \[[ISO/IEC 03|AA. C References#ISO/IEC 03]\] Section 6.7.3, "Type qualifiers" \[[Sun 05|AA. C References#Sun 05]\] [Chapter 6, "Transitioning to ISO C"|http://docs.sun.com/source/819-3688/tguide.html#pgfId-997898] |
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