osf1 man page for tis_key_create

tis_key_create(3)					     Library Functions Manual						 tis_key_create(3)

NAME
       tis_key_create - Generates a unique thread-specific data key.

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

SYNOPSIS
       #include <tis.h>

       int   tis_key_create(
			pthread_key_t	*key,
			void		(*destructor)(void *));

STANDARDS
       None

PARAMETERS
       Address of a variable that receives the key value.  This value is used in calls to tis_getspecific(3) and tis_setspecific(3) to get and set
       the value associated with this key.  Address of a routine that is called to destroy the context value when a thread terminates with a  non-
       NULL value for the key.	Note that this argument is used only when threads are present.

DESCRIPTION
       This routine generates a unique thread-specific data key.  The key argument points to an opaque object used to locate data.

       This  routine generates and returns a new key value.  The key reserves a cell.  Each call to this routine creates a new cell that is unique
       within an application invocation.  Keys must be generated from initialization code that is guaranteed to be called only	once  within  each
       process.  (See the tis_once(3) description for more information.)

       Your  program  can  associate  an  optional destructor function with each key.  At thread exit, if a key has a non-NULL destructor function
       pointer, and the thread has a non-NULL value associated with that key, the function pointed to is called with the current associated  value
       as its sole argument.  The order in which data destructors are called at thread termination is undefined.

       When  threads  are  present,  keys and any corresponding data are thread specific; they enable the context to be maintained on a per-thread
       basis.  For more information about the use of tis_key_create(3) in a threaded environment, refer to the pthread_key_create(3) description.

       DECthreads imposes a maximum number of thread-specific data keys, equal to the symbolic constant PTHREAD_KEYS_MAX.

RETURN VALUES
       If an error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are  as  follows:
       Successful  completion.	 The  system  lacked the necessary resources to create another thread-specific data key, or the limit on the total
       number of keys per process (PTHREAD_KEYS_MAX) has been exceeded.  Insufficient memory exists to create the key.	Invalid argument.

ERRORS
       None

RELATED INFORMATION
       Functions: tis_getspecific(3), tis_key_delete(3), tis_once(3), tis_setspecific(3)

       Manuals: Guide to DECthreads and Programmer's Guide

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																 tis_key_create(3)