id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
114	tc_data$loop_lock_time overflows	anonymous	Eric Swenson	"The “lockless” mufti-threaded emulator experiences a overflow fault when updating tc_data$loop_lock_time in pxss.alm after a week heavy load in a 4 CPU configuration.

loop_lock_time is (incorrectly) declared in tcm.incl.pl1 as

   2 loop_lock_time fixed bin (18), /* time looping on the APT lock */

and treated as a signed 36 bit integer by pxss.alm.

Many of the accumulated time meters in hardcore were been switched to 'fixed bin (71)' during Multics development [Olin Sibert, personal communication]; the same treatment should be applied to loop_lock_time, a small increase in overhead as defensive programming.

It is thought that the 'lockless' emulator may accumulate lock wait times disproportionately due to poor thread scheduling as compared to the fixed scheduling structure of the canonical hardware.
"	defect	closed	major	MR12.7	Hardcore	MR12.6f	fixed