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5.3.3 Testing for the Termination Flag
The following code shows how the el_autosense_thread() routine tests
for the termination flag:
while (thread_should_halt(sc->autosense_thread)) { 1
printf("el%d: Autosense thread exiting\n", ifp->if_unit);
thread_halt_self();
2
}
1 Performs an initial test for the termination flag. The termination
flag would have been set if another kernel thread had called the
thread_terminate( ) routine for the el_autosense_thread( )
routine.
2 The thread_halt_self( ) routine performs the work that is
associated with a variety of asynchronous traps (ASTs) for a kernel
thread that terminates itself. A kernel thread terminates itself by
calling the thread_halt_self() routine. The thread_halt_self( )
routine does not return to the caller.
5.3.4 Starting Up Statistics
The following code shows how the el_autosense_thread( ) routine starts
up statistics:
s = splimp();
1
simple_lock(&sc->el_softc_lock);
WRITE_CMD(sc, CMD_STATSENA);
simple_unlock(&sc->el_softc_lock);
splx(s);
1 Starts up statistics to test for the loss of the carrier during the transmit
operation.
5.3.5 Entering the Packet Transmit Loop
The following code shows how the el_autosense_thread( ) routine enters
the packet transmit loop:
good_xmits = passes = 0;
1
sc->lm_media_state = LAN_MEDIA_STATE_SENSING;
while (good_xmits < 5) {
while (thread_should_halt(sc->autosense_thread)) {
printf("el%d: Autosense thread exiting\n", ifp->if_unit);
s = splimp();
simple_lock(&sc->el_softc_lock);
WRITE_CMD(sc, CMD_STATSDIS);
5–20 Implementing the Autoconfiguration Support Section (probe)