pthread_getspecific(3t) [hpux man page]

pthread_getspecific(3T) 												   pthread_getspecific(3T)

NAME

       pthread_getspecific(), pthread_setspecific() - get or set the thread-specific data associated with a key

SYNOPSIS

PARAMETERS

	      key	Thread-specific data key whose value for the calling thread is to be set or retrieved.

	      value	Value to be assigned to the thread-specific data key for the calling thread.

DESCRIPTION

       The  function  returns the thread-specific data value associated with key for the calling thread.  If no value has been associated with key
       for the calling thread, NULL is returned.

       The function associates the thread-specific data value with key.  Each thread may bind a different value to key.  These values are  usually
       pointers to memory dynamically allocated by the calling thread.

       key  must be a valid thread-specific data key created by calling If key is not a valid thread-specific data key, undefined behavior results
       when calling these functions.

       These functions may be called from a thread-specific data destructor function. However, calling from a destructor may result in lost  stor-
       age.

RETURN VALUE

       The  function  returns  the  thread-specific data value associated with key.  If no thread-specific data value is currently associated with
       key, the value NULL is returned.

       If successful, returns zero. Otherwise, an error number is returned to indicate the error (the variable is not set).

ERRORS

       No errors are returned by the function.

       If any of the following occur, the function returns the corresponding error number:

	      [ENOMEM]	     There is insufficient memory available in which to associate value with key.

       For each of the following conditions, if the condition is detected, the function returns the corresponding error number:

	      [EINVAL]	     key is an invalid thread-specific data key.

AUTHOR

       and were derived from the IEEE POSIX P1003.1c standard.

SEE ALSO

       pthread_key_create(3T), pthread_key_delete(3T).

STANDARDS CONFORMANCE

								  Pthread Library					   pthread_getspecific(3T)

PTHREAD_KEY_CREATE(3)					   BSD Library Functions Manual 				     PTHREAD_KEY_CREATE(3)

NAME

     pthread_key_create -- thread-specific data key creation

SYNOPSIS

     #include <pthread.h>

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

DESCRIPTION

     The pthread_key_create() function creates a thread-specific data key visible to all threads in the process.  Key values provided by
     pthread_key_create() are opaque objects used to locate thread-specific data.  Although the same key value may be used by different threads,
     the values bound to the key by pthread_setspecific() are maintained on a per-thread basis and persist for the life of the calling thread.

     Upon key creation, the value NULL is associated with the new key in all active threads.  Upon thread creation, the value NULL is associated
     with all defined keys in the new thread.

     An optional destructor function may be associated with each key value.  At thread exit, if a key value has a non-NULL destructor pointer, and
     the thread has a non-NULL value associated with the key, the function pointed to is called with the current associated value as its sole
     argument.	The order of destructor calls is unspecified if more than one destructor exists for a thread when it exits.

     If, after all the destructors have been called for all non-NULL values with associated destructors, there are still some non-NULL values with
     associated destructors, then the process is repeated.  If, after at least [PTHREAD_DESTRUCTOR_ITERATIONS] iterations of destructor calls for
     outstanding non-NULL values, there are still some non-NULL values with associated destructors, the implementation stops calling destructors.

RETURN VALUES

     If successful, the pthread_key_create() function will store the newly created key value at the location specified by key and returns zero.
     Otherwise an error number will be returned to indicate the error.

ERRORS

     The pthread_key_create() function will fail if:

     [EAGAIN]		The system lacked the necessary resources to create another thread-specific data key, or the system-imposed limit on the
			total number of keys per process [PTHREAD_KEYS_MAX] would be exceeded.

     [ENOMEM]		Insufficient memory exists to create the key.

SEE ALSO

     pthread_getspecific(3), pthread_key_delete(3), pthread_setspecific(3)

STANDARDS

     The pthread_key_create() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD
								   April 4, 1996							       BSD