change-pri
|
Fires whenever a thread's priority is about to be
changed. The lwpsinfo_t of the
thread is pointed to by args[0] .
The thread's current priority is in the
pr_pri field of this structure. The
psinfo_t of the process containing
the thread is pointed to by
args[1] . The thread's new priority
is contained in args[2] .
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dequeue
|
Fires immediately before a runnable thread is dequeued
from a run queue. The lwpsinfo_t of
the thread being dequeued is pointed to by
args[0] . The
psinfo_t of the process containing
the thread is pointed to by
args[1] . The
cpuinfo_t of the CPU from which the
thread is being dequeued is pointed to by
args[2] . If the thread is being
dequeued from a run queue that is not associated with
a particular CPU, the cpu_id member
of this structure will be -1 .
|
enqueue
|
Fires immediately before a runnable thread is enqueued
to a run queue. The lwpsinfo_t of
the thread being enqueued is pointed to by
args[0] . The
psinfo_t of the process containing
the thread is pointed to by
args[1] . The
cpuinfo_t of the CPU to which the
thread is being enqueued is pointed to by
args[2] . If the thread is being
enqueued from a run queue that is not associated with
a particular CPU, the cpu_id member
of this structure will be -1. The value in
args[3] is a boolean indicating
whether the thread will be enqueued to the front of
the run queue. The value is non-zero if the thread
will be enqueued at the front of the run queue, and
zero if the thread will be enqueued at the back of the
run queue.
|
off-cpu
|
Fires when the current CPU is about to end execution
of a thread. The curcpu variable
indicates the current CPU. The
curlwpsinfo variable indicates the
thread that is ending execution. The
lwpsinfo_t of the thread that the
current CPU will next execute is pointed to by
args[0] . The
psinfo_t of the process containing
the next thread is pointed to by
args[1] .
|
on-cpu
|
Fires when a CPU has just begun execution of a thread.
The curcpu variable indicates the
current CPU. The curlwpsinfo
variable indicates the thread that is beginning
execution. The curpsinfo variable
describes the process containing the current thread.
|
preempt
|
Fires immediately before the current thread is
preempted. After this probe fires, the current thread
will select a thread to run and the
off-cpu probe will fire for the
current thread. In some cases, a thread on one CPU
will be preempted, but the preempting thread will run
on another CPU in the meantime. In this situation, the
preempt probe will fire, but the dispatcher will be
unable to find a higher priority thread to run and the
remain-cpu probe will fire instead
of the off-cpu probe.
|
remain-cpu
|
Fires when a scheduling decision has been made, but
the dispatcher has elected to continue to run the
current thread. The curcpu variable
indicates the current CPU. The
curlwpsinfo variable indicates the
thread that is beginning execution. The
curpsinfo variable describes the
process containing the current thread.
|
sleep
|
Fires immediately before the current thread sleeps on
a synchronization object. The type of the
synchronization object is contained in the
pr_stype member of the
lwpsinfo_t pointed to by
curlwpsinfo . The address of the
synchronization object is contained in the
pr_wchan member of the
lwpsinfo_t pointed to by
curlwpsinfo . The meaning of this
address is a private implementation detail, but the
address value may be treated as a token unique to the
synchronization object.
|
surrender
|
Fires when a CPU has been instructed by another CPU to
make a scheduling decision — often because a
higher-priority thread has become runnable. The
lwpsinfo_t of the current thread is
pointed to by args[0] . The
psinfo_t of the process containing
the thread is pointed to by
args[1] .
|
tick
|
Fires as a part of clock tick-based accounting. In
clock tick-based accounting, CPU accounting is
performed by examining which threads and processes are
running when a fixed-interval interrupt fires. The
lwpsinfo_t that corresponds to the
thread that is being assigned CPU time is pointed to
by args[0] . The
psinfo_t that corresponds to the
process that contains the thread is pointed to by
args[1] .
|
wakeup
|
Fires immediately before the current thread wakes a
thread sleeping on a synchronization object. The
lwpsinfo_t of the sleeping thread
is pointed to by args[0] . The
psinfo_t of the process containing
the sleeping thread is pointed to by
args[1] . The type of the
synchronization object is contained in the
pr_stype member of the
lwpsinfo_t of the sleeping thread.
The address of the synchronization object is contained
in the pr_wchan member of the
lwpsinfo_t of the sleeping thread.
The meaning of this address is a private
implementation detail, but the address value may be
treated as a token unique to the synchronization
object.
|