pthread_getspecific(3T)pthread_getspecific(3T)NAMEpthread_getspecific(), pthread_setspecific() - get or set the thread-
specific data associated with a key
SYNOPSISPARAMETERS
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 ALSOpthread_key_create(3T), pthread_key_delete(3T).
STANDARDS CONFORMANCE
Pthread Library pthread_getspecific(3T)
