NetBSD 6.1.5 - man page for pthread_getspecific (netbsd section 3)
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PTHREAD_GETSPECIFIC(3) BSD Library Functions Manual PTHREAD_GETSPECIFIC(3)
pthread_getspecific -- thread-specific data value
POSIX Threads Library (libpthread, -lpthread)
pthread_setspecific(pthread_key_t key, const void *value);
The 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
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.
The 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. Oth-
erwise an error number will be returned to indicate the error.
No errors are defined for either function.
These functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD July 9, 2010 BSD
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