| PTHREAD_GETSPECIFIC(3) | Library Functions Manual | PTHREAD_GETSPECIFIC(3) | 
pthread_getspecific,
  pthread_setspecific —
#include <pthread.h>
void *
  
  pthread_getspecific(pthread_key_t
    key);
int
  
  pthread_setspecific(pthread_key_t
    key, const void
    *value);
pthread_getspecific() function returns the value
  currently bound to the specified key on behalf of the
  calling thread. Conversely, the pthread_setspecific()
  function associates a thread-specific value with a key
  obtained via a previous call to
  pthread_key_create(3).
  Different 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.
Undefined behavior may follow if either function is called with a
    key value not obtained from
    pthread_key_create(3),
    or if the call is made after key has been deleted with
    pthread_key_delete(3).
    It is possible to call either function from a thread-specific data
    destructor function. Note however that this is not well defined for the
    pthread_setspecific() function; lost storage or
    infinite loops may occur.
pthread_getspecific() function will return the
  thread-specific data value associated with the given
  key. If no thread-specific data value is associated with
  key, then the value NULL is
  returned. If successful, the pthread_setspecific()
  function will return zero. Otherwise an error number will be returned to
  indicate the error.
| July 9, 2010 | NetBSD 9.4 |