Backed out commit 484889ea5a since the overflow of the timespec tv_nsec
field was the real cause of the problem. No need for an extra mutex.
As reported in #595
It seems that the prior use of sim_asynch_lock RECURSIVE mutex could
cause a pthread_cond_timedwait() failure with EINVAL returned.
As discussed in #595
Newest Win32 include files changed the include file order as compared to the
Microsoft MS compilers.
This is arguably a bug in the MinGW codebase, but working around it is too trivial
to complain about.
The C RTL on the latest VAX/VMS does not provide a snprintf function.
We provide a 'basic' one which meets the needs of simh as suggested
by Jordi Guillaumes Pons.
- EXPECT HALTAFTER=nnn
--> sets "nnn" as the global/default value
- EXPECT "some string"
--> uses the "nnn" global/default value
- EXPECT HALTAFTER=ttt "some string"
--> uses the "ttt" temporary value for this EXPECT only
and:
- SEND AFTER=nnn
--> sets "nnn" as the global/default value
- SEND "some string"
--> uses the "nnn" global/default value
- SEND AFTER=ttt "some string"
--> uses the "ttt" temporary value for this SEND only
(and similarly for the SEND DELAY value).
This allows a device simulator to specifically name the units that it uses
for different purposes. This info is visible in the output of SHOW QUEUE
and debug output.
Once specified or dynamically determined (as previously occurred with
each call to sim_uname()), that name is saved for fast delivery on subsequent
calls. This will remove some overhead when running with debugging on.
- Support for arbitrary long wait intervals in sim_activate_after with
precisely correct delays aligned with the calibrated clock once
per second.
- Proper handling of calls to sim_cancel for calibrated timer units
- Properly allow stopping of calibrated clock by calling sim_rtcn_calb
with a ticksper == 0
- Only schedule asynchronous timer activities for delays longer than
the minimal OS sleep time
- Only wake asynchronous timer thread to queue new timer events
that are shorter than the currently shortest scheduled event
It was defined in lowercase and has now been made upper case for consistency.
The code which performs the match also has been change to do a case
insensitive compare.
Also:
- allow a timer to dynamically stop itself (by calling sim_rtcn_calb
with tps=0), and then to start the internal timer to provide a calibration
baseline if necessary.
- Fix coschedule interval computation when the queue is empty.
- Properly select the correct timer for coscheduling without a specific tmr
- Properly adjust the coschedule queue's next time value when entries are
canceled.
- Cleaned up throttling to behave well with all potential throttling rates and
to make visible what is happening when boundaries are reached.
Clock devices which call sim_register_clock_unit or sim_register_clock_unit_tmr
are best behaved if they use sim_activate_after to schedule their tick events.
Asynchronous clocks are now built for all simulators which are built with
SIM_ASYNCH_IO defined. The default behavior has asynchronous clocks
disabled since this is still experimental, but it can be enabled with
SET TIMER ASYNC.
Catchup clock ticks are now available, but since they're experimental,
they aren't enabled by default. Catchup ticks are only available if the
simulators clock device calls sim_rtcn_tick_ack to acknowledge processing
of clock ticks. The VAX simulators have been modified to leverage this.
Catchup clock ticks can be enabled with SET TIMER CATCHUP
Additionally, an idle threshold is provided which can be used to
influence when clock calibration may be suppressed. The default is not
to suppress calibration activities.
The various timer behaviors are visible with the SHOW TIMER command.
The state of the operating timer facilities is visible with: SHOW CLOCK
Timer events which are queued are visible with the SHOW QUEUE command.
