pthread_setspecific(3) [netbsd man page]

PTHREAD_GETSPECIFIC(3)					   BSD Library Functions Manual 				    PTHREAD_GETSPECIFIC(3)

NAME

     pthread_getspecific -- thread-specific data value

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     void *
     pthread_getspecific(pthread_key_t key);

     int
     pthread_setspecific(pthread_key_t key, const void *value);

DESCRIPTION

     The pthread_getspecific() function returns the value currently bound to the specified key on behalf of the calling thread.  Conversely, the
     pthread_setspecific() function associates a thread-specific value with a key obtained via a previous call to pthread_key_create(3).  Differ-
     ent threads have different values bound to each key.  These values are typically pointers to blocks of dynamically allocated memory that have
     been reserved for use by the calling thread.

     Undefined behavior may follow if either function is called with a key value not obtained from pthread_key_create(3), or if the call is made
     after key has been deleted with pthread_key_delete(3).  It is possible to call either function from a thread-specific data destructor func-
     tion.  Note however that this is not well defined for the pthread_setspecific() function; lost storage or infinite loops may occur.

RETURN VALUES

     The pthread_getspecific() function will return the thread-specific data value associated with the given key.  If no thread-specific data
     value is associated with key, then the value NULL is returned.  If successful, the pthread_setspecific() function will return zero.  Other-
     wise an error number will be returned to indicate the error.

ERRORS

     No errors are defined for either function.

SEE ALSO

     pthread_key_create(3)

STANDARDS

     These functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD
								   July 9, 2010 							       BSD

pthread_getspecific(3C) 				   Standard C Library Functions 				   pthread_getspecific(3C)

NAME

       pthread_getspecific, pthread_setspecific - manage thread-specific data

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ library... ]
       #include <pthread.h>

       int pthread_setspecific(pthread_key_t key, const void *value);

       void *pthread_getspecific(pthread_key_t key);

DESCRIPTION

       The  pthread_setspecific()  function  associates  a thread-specific value with a key obtained by way of a previous call to pthread_key_cre-
       ate(). Different threads may bind different values to the same key. These values are typically pointers to blocks of dynamically  allocated
       memory that have been reserved for use by the calling thread.

       The pthread_getspecific() function returns the value currently bound to the specified key on behalf of the calling thread.

       The  effect  of calling pthread_setspecific() or pthread_getspecific() with a key value not obtained from pthread_key_create() or after key
       has been deleted with pthread_key_delete() is undefined.

       Both pthread_setspecific() and pthread_getspecific() may be called from	a  thread-specific  data  destructor  function.  However,  calling
       pthread_setspecific() from a destructor may result in lost storage or infinite loops.

RETURN VALUES

       The   pthread_getspecific() function returns the thread-specific data value associated with the given key. If no thread-specific data value
       is associated with key, then the value NULL is returned.

       Upon successful completion, the pthread_setspecific() function returns  0. Otherwise, an error number is returned to indicate the error.

ERRORS

       The  pthread_setspecific() function will fail if:

       ENOMEM	 Insufficient memory exists to associate the value with the key.

       The pthread_setspecific() function may fail if:

       EINVAL	 The key value is invalid.

       The  pthread_getspecific() function does not  return errors.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pthread_key_create(3C), attributes(5), standards(5)

SunOS 5.11							    23 Mar 2005 					   pthread_getspecific(3C)