freebsd man page for pthread_setspecific

PTHREAD_SETSPECIFIC(3)					   BSD Library Functions Manual 				    PTHREAD_SETSPECIFIC(3)

NAME
     pthread_setspecific -- set a thread-specific data value

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

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

DESCRIPTION
     The pthread_setspecific() function associates a thread-specific value with a key obtained via a previous call to pthread_key_create().  Dif-
     ferent threads can 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 effect of calling pthread_setspecific() with a key value not obtained from pthread_key_create() or after key has been deleted with
     pthread_key_delete() is undefined.

     The pthread_setspecific() function may be called from a thread-specific data destructor function, however this may result in lost storage or
     infinite loops.

RETURN VALUES
     If successful, the pthread_setspecific() function will return zero.  Otherwise an error number will be returned to indicate the error.

ERRORS
     The pthread_setspecific() function will fail if:

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

     [EINVAL]		The key value is invalid.

SEE ALSO
     pthread_getspecific(3), pthread_key_create(3), pthread_key_delete(3)

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

BSD
								   April 4, 1996							       BSD