PERFORCE change 93945 for review
John Baldwin
jhb at FreeBSD.org
Fri Mar 24 20:43:58 UTC 2006
http://perforce.freebsd.org/chv.cgi?CH=93945
Change 93945 by jhb at jhb_twclab on 2006/03/24 20:43:26
The volatile cast didn't work on amd64 for some reason (gcc bug?).
Just make the td_state member of struct thread volatile.
Affected files ...
.. //depot/projects/smpng/sys/kern/kern_mutex.c#120 edit
.. //depot/projects/smpng/sys/sys/proc.h#168 edit
Differences ...
==== //depot/projects/smpng/sys/kern/kern_mutex.c#120 (text+ko) ====
@@ -551,14 +551,8 @@
if (m != &Giant && TD_IS_RUNNING(owner)) {
#endif
turnstile_release(&m->mtx_object);
-
- /*
- * Inline expansion of TD_IS_RUNNING(owner) to
- * force volatile.
- */
while (mtx_rawowner(m) == owner &&
- (volatile enum _td_state)owner->td_state ==
- TDS_RUNNING) {
+ TD_IS_RUNNING(owner)) {
cpu_spinwait();
}
continue;
==== //depot/projects/smpng/sys/sys/proc.h#168 (text+ko) ====
@@ -311,7 +311,7 @@
* or already have been set in the allocator, constructor, etc.
*/
struct pcb *td_pcb; /* (k) Kernel VA of pcb and kstack. */
- enum _td_state {
+ volatile enum {
TDS_INACTIVE = 0x0,
TDS_INHIBITED,
TDS_CAN_RUN,
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