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set a thread-specific data value

#include <pthread.h>
pthread_setspecific(pthread_key_t key, const void *value);

The pthread_setspecific() function associates a thread-specific value with a key obtained via a previous call to pthread_key_create(). Different threads may 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.
pthread_setspecific() may be called from a thread-specific data destructor function; however, this may result in lost storage or infinite loops.

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

pthread_setspecific() will fail if:
Insufficient memory exists to associate the value with the key.
The key value is invalid.

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

pthread_setspecific() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
January 27, 2017 OpenBSD-current