Synchronization Primitives

This section describes dcmds and walkers used to examine particular kernel synchronization primitives. The semantics of each primitive are discussed in the corresponding man pages section 9F: DDI and DKI Kernel Functions.

dcmds

rwlock ::rwlock

Given the address of a readers-writers lock (see rwlock(9F)), display the current state of the lock and the list of waiting threads.

[ address ] ::wchaninfo [-v]

Given the address of a condition variable (see condvar(9F)) or semaphore (see semaphore(9F)), display the current number of waiters on this object. If no explicit address is specified, display all such objects that have waiting threads. If the -v option is specified, display the list of threads that are blocked on each object.

Walkers

blocked

Given the address of a synchronization object (such as a mutex(9F) or rwlock(9F)), iterate over the list of blocked kernel threads.

wchan

Given the address of a condition variable (see condvar(9F)) or semaphore (see semaphore(9F)), iterate over the list of blocked kernel threads.