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Asked: 2026-05-13T17:03:16+00:00

What does _np suffix mean here: pthread_mutex_timedlock_np or in macros PTHREAD_MUTEX_TIMED_NP Upd: From glibc2.2

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What does “_np” suffix mean here:

pthread_mutex_timedlock_np

or in macros

PTHREAD_MUTEX_TIMED_NP

Upd:

From glibc2.2

enum 
{ 
  PTHREAD_MUTEX_TIMED_NP, 
  PTHREAD_MUTEX_RECURSIVE_NP, 
  PTHREAD_MUTEX_ERRORCHECK_NP, 
  PTHREAD_MUTEX_ADAPTIVE_NP 
#ifdef __USE_UNIX98 
  , 
  PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP, 
  PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, 
  PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, 
  PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL 
#endif 
#ifdef __USE_GNU 
  /* For compatibility. */ 
  , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_ADAPTIVE_NP 
#endif 
};

Does defining __USE_UNIX98
change portability of _NP functions/macro?

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1 Answer

  1. Editorial Team

    Non standard extensions — i.e., Non Portable. ref (from the Internet Archive)

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