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pthread_attr_getguardsize(3)
NAME
  pthread_attr_getguardsize - Obtains the guardsize attribute of the
  specified thread attributes object.

LIBRARY
  DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS
  #include <pthread.h>

  int pthread_attr_getguardsize_np(
		  const pthread_attr_t	*attr,
		  size_t		*guardsize);

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS
  attr	    Address of the thread attributes object whose guardsize attribute
	    is obtained.

  guardsize Receives the value of the guardsize attribute of the thread
	    attributes object specified by attr.

DESCRIPTION
  This routine obtains the value of the guardsize attribute of the thread
  attributes object specified in the attr argument and stores it in the
  location specified by the guardsize argument.	 The specified attributes
  object must already be initialized at the time this routine is called.

  When creating a thread, use a thread attributes object to specify
  nondefault values for thread attributes.  The guardsize attribute of a
  thread attributes object specifies the minimum size (in bytes) of the guard
  area for the stack of a new thread.

  A guard area can help a multithreaded program detect overflow of a thread's
  stack. A guard area is a region of no-access memory that DECthreads
  allocates at the overflow end of the thread's stack. When any thread
  attempts to access a memory location within this region, a memory
  addressing violation occurs.




NOTES
  The value of the guardsize attribute of a particular thread attributes
  object does not necessarily correspond to the actual size of the guard area
  of any existing thread in your multithreaded program.

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.

  [EINVAL]  The value specified by attr is invalid.

ERRORS
  None

RELATED INFORMATION
  Functions: pthread_attr_init(3),

  pthread_create(3)


  Manuals: Guide to DECthreads and Programmer's Guide