Thread-Safe Functions

• Not all functions can be called from threads (e.g. strtok())

  • many use global/static variables
  • new versions of UNIX have thread-safe replacements, like strtok_r()

• Safe:

  • ctime_r(), gmtime_r(), localtime_r(), rand_r(), strtok_r()

• Not Safe:

  • ctime(), gmtime(), localtime(), rand(), strtok(), gethostXXX(), inet_toa()

• could use semaphores to protect access

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