The next command with no arguments steps one line stepping over calls:
next
To step n lines skipping over calls:
next n
To deliver the given signal while executing the next command:
next ... -sig sig
The dbxenv variable step_events controls whether breakpoints are enabled during a step.
next tid
To step the given LWP (lightweight process):
next lwpid
This will not implicitly resume all LWPs when skipping a function. When an explicit tid or lwpid is given, the deadlock avoidance measure of the generic next is defeated.
With multithreaded programs, when a function call is skipped over, all LWPs are implicitly resumed for the duration of that function call in order to avoid deadlock. Non-active threads cannot be stepped.
For information on lightweight processes (LWPs), see the Solaris Multithreaded Programming Guide.