pthread_setspecific(3) - NetBSD Manual Pages

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PTHREAD_SETSPECIFIC(3)  NetBSD 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().  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.

     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.

     pthread_setspecific() may be called from a thread-specific data destruc-
     tor 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

     pthread_setspecific() shall fail if:

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

     pthread_setspecific() may fail if:

     [EINVAL]           The key value is invalid.


SEE ALSO

     pthread_getspecific(3), pthread_key_create(3), pthread_key_delete(3)


STANDARDS

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

NetBSD 5.1                     January 30, 2003                     NetBSD 5.1