Data Keys Page

A pthread-specific data key is an object that can have a pointer value of type void * associated with it for each pthread in a process.

This window contains a list of all keys known in this process.

TotalView displays information for each key. Many applications initially set keys to zero (the NULL pointer value) using pthread_set_specific(). Note that a key’s information is not displayed until a thread sets a value for it, even if the value set is NULL.

ID

This field contains the sequence number assigned to this key by the threads package. Only the line for the first thread’s value for a key will contain an ID; subsequent lines for the same key omit the ID as a way of visually grouping values with the same ID.

Thread

This field has the system TIDs of the threads that have a value for this key. Diving or selecting on this number tells TotalView to display the Process Window for the thread. TotalView displays the same window if you dive or select the thread’s entry in the Root Window’s Attached Page.

Value

This field contains the contents of the key for a pthread. Diving into this field opens a window containing a view of the actual key data.