tis_mutex_trylock(3)

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tis_mutex_trylock(3)
NAME
  tis_mutex_trylock - Attempts to lock the specified mutex.

LIBRARY
  Standard C Library (libc.so, libc.a)

SYNOPSIS
  #include <tis.h>

  int	tis_mutex_trylock(
			 pthread_mutex_t   *mutex);

STANDARDS
  None

PARAMETERS
  *mutex    Address of the mutex (passed by reference) to be locked.

DESCRIPTION
  This routine attempts to lock the specified mutex mutex.  When this routine
  is called, an attempt is made immediately to lock the mutex.	If the mutex
  is successfully locked, zero (0) is returned.

  If the specified mutex is already locked when this routine is called, the
  caller does not wait for the mutex to become available.  [EBUSY] is
  returned, and the thread does not wait to acquire the lock.

RETURN VALUES
  If an error condition occurs, this routine returns an integer value
  indicating the type of error.	 Possible return values are as follows:

  0	    Successful completion.

  [EBUSY]   The mutex is already locked; therefore, it was not acquired.

  [EINVAL]  The value specified by mutex is invalid.

ERRORS
  None

RELATED INFORMATION
  Functions: tis_mutex_destroy(3), tis_mutex_init(3), tis_mutex_lock(3),
  tis_mutex_unlock(3)

  Manuals: Guide to DECthreads and Programmer's Guide
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