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



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


NAME
       dgpthreadgroupself - get calling thread's group ID

SYNOPSIS
       #include <pthread.h>

       dgpthreadgroupt dgpthreadgroupself(void);

DESCRIPTION
       The dgpthreadgroupself() function returns the thread group ID of
       the calling thread in a way similar to which pthreadself() returns
       the thread ID of the calling thread.

DIAGNOSTICS
   Returns
       See DESCRIPTION.

SEE ALSO
       dgpthreadgroupcreate(3T), dgpthreadgroupdestroy(3T),
       dgpthreadgroupequal(3T), dgpthreadgroupgetlwpgroupid(3T).

NOTES
       The only operations allowed on thread group IDs are assignment and
       comparison using dgpthreadgroupequal().  An application cannot
       assume that a thread group ID is implemented as a scalar value such
       as an unsigned int.  In the future, DG/UX may implement these as
       structures.  For this reason, it is incorrect to assume that thread
       group IDs can be treated as integers and passed, for example, to
       printf() for display.  However, the corresponding LWP group ID for a
       thread group ID is a scalar and can be obtained with a call to
       dgpthreadgroupgetlwpgroupid(3T).

       In the current DG/UX implementation, the thread group ID is the same
       as the corresponding LWP group ID, and thread group IDs start at 0
       and count up in a process.  Hence thread group IDs are not global
       across processes, but rather local to a process.  However, an
       application should not take advantage of this knowledge and assume
       that thread group IDs can be used like integers in places such as
       array indexes.

       Moreover, because thread group IDs can get reused within the same
       process, an application must not assume that thread group IDs will be
       unique for the entire life of a process.   In fact, an application
       needs to take great care not to use a thread group ID of a destroyed
       thread group.


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