pthread_getspecific(3T) — DG/UX R4.11MU05



pthread_setspecific(3T)        DG/UX R4.11MU05       pthread_setspecific(3T)


NAME
       pthreadsetspecific, pthreadgetspecific - associate or retrieve a
       thread-specific value for a key

SYNOPSIS
       #include <pthread.h>

       int pthreadsetspecific(pthreadkeyt key, void *value1);

       int pthreadgetspecific(pthreadkeyt key, void **value2);

   where:
       key     A process-wide, thread-specific data key
       value1  A value to be associated with the key
       value2  A pointer to the location to store the value associated with
               the key

DESCRIPTION
       The pthreadsetspecific() function associates a thread-specific value
       with a process-wide key obtained via a previous call to
       pthreadkeycreate().  Different threads may bind different values to
       the same process-wide key.  These values are typically pointers to
       blocks of dynamically allocated memory that have been reserved for
       use by the calling thread.  Hence they are defined to have type (void
       *).

       The pthreadgetspecific() function returns the value currently bound
       to the process-wide key on behalf of the calling thread.  The value
       is written into the location pointed to by value2.  A value of NULL
       is returned if the thread has never associated a value with the key.
       This implies that newly created threads have NULL values for all
       valid keys.

       The effect of calling pthreadsetspecific() or pthreadgetspecific()
       either explicitly or implicitly from a thread-specific data
       destructor function is unspecified.

DIAGNOSTICS
   Return Value
       If successful, these functions return 0.  Otherwise they return -1
       and set errno to indicate the error.

       If successful, pthreadgetspecific() stores the value currently bound
       to the specified key into the location pointed to by value2.

   Errors
       For each of the following conditions, pthreadsetspecific() and
       pthreadgetspecific() return -1 and set errno to the corresponding
       value:

       [EINVAL]  The key is invalid.  This occurs when the key does not
                 refer to an existing key created by a call to
                 pthreadkeycreate().

SEE ALSO
       pthreadkeycreate(3T).


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