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NetBSD 6.1.5 - man page for pthread_setspecific (netbsd section 3)

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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).
     Different 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 function.  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.  Oth-
     erwise 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
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