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MFP4: Note why we do the dance we do for waiting for the thread to die.

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This commit is contained in:
Warner Losh 2005-10-08 06:51:47 +00:00
parent a3699bcaa6
commit ed448ee4de
1 changed files with 8 additions and 0 deletions
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8
sys/dev/pccbb/pccbb.c
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@ -306,6 +306,14 @@ cbb_detach(device_t brdev)
* XXX buggy client drivers?
*/
bus_teardown_intr(brdev, sc->irq_res, sc->intrhand);
/*
* Wait for the thread to die. kthread_exit will do a wakeup
* on the event thread's struct thread * so that we know it is
* save to proceed. IF the thread is running, set the please
* die flag and wait for it to comply. Since the wakeup on
* the event thread happens only in kthread_exit, we don't
* need to loop here.
*/
sc->flags |= CBB_KTHREAD_DONE;
if (sc->flags & CBB_KTHREAD_RUNNING) {
cv_broadcast(&sc->cv);