Condition ­Variables Page

The Condition Variable Page lists all the condition variables known in this process.

For each condition variable, TotalView displays the following information:

ID

The ID is the sequence number assigned to this condition variable by the threads package. Diving into this field opens a Variable Window containing a view of the condition variable’s data.

Pshared

This value indicates if the condition variable can be shared by other processes.

Private

The condition variable can only be manipulated by the process that initialized it.

Shared

The condition variable can be manipulated by any process that has access to its memory. (Some versions of IBM’s system libraries cannot provide information on shared condition values to TotalView. If this information is not available, TotalView only describes private condition values.)

Waiters

If threads are waiting for this condition variable, TotalView displays their system TIDs, one thread for each line, on the lines following the condition variable. Diving or selecting entries in the list of waiting threads opens windows for them.

If TotalView cannot obtain this information, it does not show waiting threads.

Mutex

This field contains the ID of the mutex that guards the condition variable. If TotalView can translate the ID into an address, diving into this field opens a Variable Window containing a view of the guard mutex’s data.

TotalView can only translate this ID if it has already been initialized. That can be done statically or by using an attributes object. See the following mutex and condition variable man pages for more information: pthread_cond_init (3), pthread_mutex_init (3), pthread_cond_initializer (3), and pthread_mutex_initializer (3).

Address

This field has the condition variable’s memory address. Diving into the address field opens a Variable Window containing a view of the actual condition variable’s data.