HP-UX Process Management: White Paper

List of Figures

1-1 32-bit address space layout on PA1.x

1-2 Process structure layout, showing context and space use.

1-3 Process address space in EXEC_MAGIC format

1-4 Process states and transitions

1-5 Typical thread state sequence

1-6 Thread life cycle

1-7 User-space (M x 1) threads for an application (process)

1-8 Kernel-space (1 x 1) threads for an application (process)

1-9 User-space and kernel-space (M x N) threads for an application (process)

1-10 Comparing fork() and vfork() at process creation

1-11 Kernel-level view of the newproc() routine

1-12 Kernel-level view of procdup() routine

1-13 kernel view of getxfile

1-14 Runnable vfork'd child calls exec()

1-15 sleep() routine

1-16 Summary of the exit system call

1-17 Process termination -- wait()

1-18 Process termination

1-19 Process structure, virtual layout overview

1-20 The proc Table

1-21 Kernel threads

1-22 Role of the vas structure

1-23 pregion in context

1-24 Example of four possible pregions

1-25 User area (uarea) in a thread-structured system

1-26 Schedulers and Priority values

1-27 Run queues of thread lists waiting to run

1-28 Run queue, showing priorities

1-29 Run queue initialization

1-30 RTSCHED run queue detail

1-31 Threads scheduler

1-32 SCHED_RTPRIO and SCHED_TIMESHARE queue

1-33 SCHED_RTPRIO (HP-UX REAL TIME) run queue

1-34 SCHED_TIMESHARE run queue

1-35 Inheritance of Scheduling policy and priority

1-36 Thread scheduling timeline

1-37 Adjusting a thread priority

1-38 process scheduling -- swtch()

1-39 A user process makes a system call.

1-40 An interrupt occurs