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# Thread-Specific Data [POSIX Section 17]

## Functions Implemented

    int pthread_key_create(pthread_key_t *key,
    	               void (*destructor)(void *));
    int pthread_setspecific(pthread_key_t key, const void *pointer);
    void *pthread_getspecific(pthread_key_t key);
    int pthread_key_delete(pthread_key_t key);

## Functions Omitted

<none>

## Notes

- The value of PTHREAD_DESTRUCTOR_ITERATIONS is provided by the CYGNUM_POSIX_PTHREAD_DESTRUCTOR_ITERATIONS option. This controls the number of times that a key destructor will be called while the data item remains non-NULL.

- The value of PTHREAD_KEYS_MAX is provided by the CYGNUM_POSIX_PTHREAD_KEYS_MAX option. This defines the maximum number of per-thread data items supported. The POSIX standard calls for this to be a minimum of 128, which is rather large for an embedded system. The default value for this option is set to 128 for compatibility but it should be reduced to a more usable value.

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Thread Management [POSIX Section 16] | Up | Thread Cancellation [POSIX Section 18]