int pthread_key_create(pthread_key_t *key, void (*destructor)(void *));
Upon key creation, the value NULL is associated with the new key in all active threads. Upon thread creation, the value NULL is associated with all defined keys in the new thread.
An optional destructor function may be associated with each key value. At thread exit, if a key value has a non-NULL destructor pointer, and the thread has a non-NULL value associated with that key, the function pointed to is called with the current associated value as its sole argument. The order of destructor calls is unspecified if more than one destructor exists for a thread when it exits.
If, after all destructors have been called for all non-NULL values with associated destructors, there are still some non-NULL values with associated destructors, then the process is repeated, up to a maximum of PTHREAD_DESTRUCTOR_ITERATIONS iterations.
Is the location where the newly allocated key value is stored.
Is the destructor function to run on thread exit. This may be set to NULL if no destructor function is required.
The system lacked the necessary resources to create another thread-specific data key, or the system-imposed limit on the total number of keys per process PTHREAD_KEYS_MAX has been exceeded.
Insufficient memory exists to create the key.
key is an invalid pointer.
POSIX P1003.1 (1996)
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