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tis_mutex_init(3)
NAME
  tis_mutex_init - Initializes a mutex object.

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

SYNOPSIS
  #include <tis.h>

  int	tis_mutex_init(
			pthread_mutex_t	  *mutex);

STANDARDS
  None

PARAMETERS
  mutex	    Pointer to a mutex object (passed by reference) to be
	    initialized.

DESCRIPTION
  This routine initializes a mutex object with the DECthreads default mutex
  attributes.  A mutex is a synchronization object that allows multiple
  threads to serialize their access to shared data.

  The mutex object is initialized and set to the unlocked state.  Mutexes can
  be allocated in heap or static memory, but not on a stack.

  Your program can use the PTHREAD_MUTEX_INITIALIZER macro to statically
  initialize a mutex object without calling this routine.  Statically
  initialized mutexes need not be destroyed using tis_mutex_destroy(3).	 Use
  this macro as follows:

  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER

RETURN VALUES
  If an error condition occurs, this routine returns an integer value
  indicating the type of error, the mutex is not initialized, and the
  contents of mutex are undefined.  Possible return values are as follows:

  0	    Successful completion.

  [EAGAIN]  The system lacks the necessary resources to initialize a mutex.

  [ENOMEM]  Insufficient memory exists to initialize the mutex.

  [EBUSY]   The implementation has detected an attempt to reinitialize mutex
	    (a previously initialized, but not yet destroyed mutex).

  [EINVAL]  The value specified by mutex is invalid.

  [EPERM]   The caller does not have privileges to perform this operation.

ERRORS
  None

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

  Manuals: Guide to DECthreads and Programmer's Guide