JPH01304562A - Adapter monitor system - Google Patents

Abstract

PURPOSE:To economize timer resources and reduce the load for monitor of an adapter by operating various flags to monitor the abnormality of the adapter in accordance with issues and completion of a command and the report of time-out from an independently started timer. CONSTITUTION:A command processing part 4 sets a command flag 7 in accordance with issue of a command from a main body 1 to an adapter 2 and rests the command flag 7 at the time of completion of the command. A NOP command flag 8, a time-out flag 6, and one timer 9 are provided, and these flags are operated in accordance with issue and completion of the command and the report of time-out to discriminate the abnormality of the adapter.

Description

[Detailed Description of the Invention] [Summary] Regarding the adapter monitoring method for monitoring the adapter, a plurality of flags are provided to associate the monitoring timer with command issuance, and the startup of the monitoring timer can be restarted regardless of command issuance or completion. In order to save timer resources and reduce the load for repeatedly monitoring the adapter, we set a command flag to be set when a command is issued to the adapter, a timeout flag to be set when the command times out, and a command to be issued to the adapter. A command processing unit that sets the above command flag when the command is completed, and resets the command flag and the timeout flag when a command completion is received from the adapter, and when the timeout flag is set in response to a timeout notification from the timer. It is determined that the adapter is abnormal.
On the other hand, the adapter is configured to include a timeout processing section that sets a timeout flag and restarts a timer when the timeout flag is not set, and monitors for adapter abnormality. Additionally, we have added a new NOP command flag that is reset upon timeout and set each time a command is issued or completed.
Taking the timeout notification as a trigger, if the above timeout flag, command flag, and newly provided NOP command flag are set, the timeout flag is set and a NOP command is issued to the adapter, and the next timeout notification is used as a trigger. , the adapter is configured to be determined to be abnormal if the timeout flag has not been reset due to completion of the command corresponding to the issuing of the Mop command.

[Industrial Application Field] The present invention relates to an adapter monitoring method for monitoring adapters.

[Prior art and problems to be solved by the invention] Conventionally, monitoring whether a communication control adapter is operating normally has been done by:
As shown in FIG. 6(a), processing is performed depending on whether or not the time from when a processing request (command) is issued to the communication control adapter until a completion response is returned has not timed out. That is, a command is issued to the communication control adapter, a timer is started, and each time a command is issued, it is monitored whether a completion response is returned within the timeout time t0 measured by the timer.

For this reason, as the number of commands issued increases, the number of timer activations for monitoring increases, and in the case of full-duplex communication, it is necessary to activate multiple monitoring timers at the same time. There was a problem in that the load for this would further increase. In addition, a command for only asynchronous event notification to the communication control adapter (
Because of this timer monitoring, READ) also has the problem of having to make an empty completion response within a certain period of time, as shown in FIG. 6(b), even though there is no response event.

The present invention provides a plurality of flags that relate the monitoring timer and command issuance, and enables the start of the monitoring timer to be activated by command issuance.
The purpose of this is to repeatedly restart the adapter regardless of its completion, thereby saving timer resources and reducing the load for monitoring the adapter.

[Means to solve problems]

Means for solving the problem will be explained with reference to FIG.

In FIG. 1, the command processing unit 4 sets/resets a one-time flag in response to command issuance and command completion (completion response).

The timeout processing unit 5 detects an adapter abnormality, sets/resets a corresponding flag, restarts the timer 9, etc. in response to a timeout notified from the timer 9.

The timeout flag (tof) 6 is a flag that is set when a timeout occurs.

The command flag (cf) 7 is a flag that is set when a command is issued.

The NOP command flag 8 is a flag for monitoring adapter abnormalities caused by NOP commands.

The timer 9 notifies the timeout processing section 5 of a timeout when the timeout period t0 has elapsed after being started.

[Effect]

In the present invention, as shown in FIG. 1, the command processing section 4
A command flag 7 is set in response to issuing a command from the main body 1 to the adapter 2, and is reset when the command is completed. At this time, triggered by the timeout notification from timer 9,
If command flag 7 is set (command completion has not been received), timeout flag 7 is set, and further, triggered by the next timeout notification,
If this timeout flag 7 remains set, it is determined that the adapter is abnormal. Also, NOP
A new command flag 8 is provided, which is set together with the command flag 7 when a command is issued, triggered by a timeout notification.

If the P command flag 8 is not set, the timeout flag 6 is set and a NOP command is automatically issued, and the next timeout notification is used as a trigger.
If the timeout flag 6 is not reset upon completion of the NOP command and remains set, it is determined that the adapter is abnormal.

Therefore, timeout flag 6, command flag 7, N
An OP command flag 8 and one timer 9 are provided,
By manipulating these flags in response to command issue/completion and timeout notifications, it is possible to save the timer to one, minimize the load for adapter monitoring even under high load, and eliminate idle responses. becomes.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be explained in detail using FIGS. 1 to 5.

In FIG. 1, the main body 1 monitors the operation of the adapter 2,
It also requests transmission from the adapter 2 and receives data transferred from the other party.

The adapter (communication control adapter) 2 transfers data via the line and receives data transferred via the line.
It is composed of etc.

The adapter monitoring unit 3 monitors the operation of the adapter 2, and includes a command processing unit 4 that sets/resets flags in response to command issuance and response, and a command processing unit 4 that sets/resets flags in response to a timeout notification from a timer 9. a timeout processing unit 5 that operates the timer 9 and restarts the timer 9, a timeout flag (to06), a command flag (cf) 7,
and NOP command flag (nf) 8. These flags will be explained below as tof, cf, and nf.

Timer 9 is a restartable timer.

The flag operation at the time of starting the monitoring timer will be explained using FIG. 2(A). This flag operation is performed by the timeout processing section 5 in FIG.

In Figure 2 (a), ■ resets all flags
(tof=cf=nf=0).

■Start the timer.

By the above operation, when the timer 9 is started, all flags are reset to 0 ((0, 0, 0), see FIG. 4).

Flag operations when issuing a command will be explained using FIG. 2(b). This flag operation is performed by the command issuing unit 4 in Figure 1.
-1 performs.

In FIG. 2(b), 0 issues a command. This means that a command is issued to adapter 2.

0 sets flags (cf, nf) (Cf=nf
-4).

By the above operations, cf and nf are set when issuing a command ((0, ■, 1), see command issuing in FIG. 4).

The flag operation at the time of command completion will be explained using FIG. 2(c). This flag operation is performed in the command completion section 4 in Figure 1.
-2 performs.

In Figure 2 (c), ■ sets the flag (nf),
Reset flag (tof, cf) (tof=cf
=Q, nf=1).

With the above operations, when the command is completed, t.

f and cf are reset and nof remains set (0.0.1).

Next, regarding the operation shown in the flowchart of FIG.
This will be explained sequentially using the figures and the fifth operation explanatory diagram. Here, the three flags in FIGS. 4 and 5 are
As shown in the top row of Figure (a), (shown in the order of tof, cf, nf> (seso) -1, reset = 0).

First, normal operation at the time of command issuance/completion will be explained using FIG. 4(a).

Figure 4 (a) ■ shows the flag (0, 0) when the timer starts.
, 0) (Fig. 2 (a) ■).

■ is forcibly set to flags (0, 1, 1) in response to the command issued by main unit 1 to adapter 2 (
Figure 2 (b) GD).

(2) is forcibly reset to the flag (0, 0, 1) in response to the main body 1 receiving command completion from the adapter 2 ((3) in FIG. 2).

■ is reset to the flag (0, 0, 0) in response to the timeout notification from timer 9 (Fig. 3 [Yes] NO
1■NO1■YES, @ resets nf=Q, [phase] starts the timer).

According to the above procedure, if the command completion is received before the timeout notification in response to the command issued by the main body 1 to the adapter 2, the flag is reset to (0, 0, 0) and no adapter abnormality is detected.

Second, normal operation at the time of command issuance/completion will be explained using FIG. 4(b).

Figure 4 (b) ■ shows the flag (0, O) when the timer starts.
, O) (Fig. 2 (a) ■).

■ is forcibly set to flags (0, 1, 1) in response to the command issued by main unit 1 to adapter 2 (
Figure 2 (b) ■).

■ is set/reset to flags (1, 1, 0) in response to the timeout notification from timer 9 (Fig. 3, 0).
NO1@YES,, @T: set to f = 1, reset nf = 0 with ■, start timer with [phase]).

(2) is forcibly set to the flag (0, 0, l) in response to the main body 1 receiving command completion from the adapter 2 ((3) in FIG. 2).

■Resets the flag (0, 0, 0) in response to the timeout notification from timer 9 (Fig. 3 ■NO1■
NO1, ■YES, @ resets nf=0, [phase] starts the timer).

According to the above procedure, if a command completion is received after the timeout notification in response to the command issued by the main body 1 to the adapter 2, the flag is reset to (0,010) and no adapter abnormality is detected.

Third, an example of command issuance/abnormality detection will be explained using FIG. 5(a).

Figure 5 (a) ■ shows the flag (0, 0) when the timer starts.
, 0) (Fig. 2 (a) ■).

■ is forcibly set to the flag (0, 1, ■) in response to the command issued by main unit 1 to adapter 2 (
Figure 2 (b) ■).

■ is set/reset to the flag (1, ■, 0) in response to the timeout notification from timer 9 (Fig. 3 ■
N○, @YES, @ sets tof=1, ■ sets nf=
(reset to o, start timer with ■).

3 corresponds to the time-out notification from the timer 9 and is a flag (1, 2, 0), so the result is YES in FIG. 3, and it is determined that an adapter abnormality has been detected.

Through the above procedure, tof is set in response to the fact that the command completion is not received at the time of the next timeout notification in response to the command issued by the main body 1 to the adapter 2, and tof is set at the time of the next timeout notification. If remains set, it will be detected as an adapter error.

Fourth, an example of NOP command issuance/abnormality detection will be explained using FIG. 5(b).

Figure 5 (b) ■ shows the flag (0, 0) when the timer starts.
, O) (Fig. 2 (a) ■).

(2) is set to the flag (0, 0, 0) in response to the timeout notification from the timer 9.

■ In addition to ■, set the flag (1, 0, 0) (Fig. 3 ■ No, @No, @No, [phase] tof
= set to 1, ■ automatically issues NOP command, ■
nf = 0, timer start with [phase]).

■ corresponds to the timeout notification from timer 9 and is the flag (l, 0.0), so in Figure 3 [phase] YES
, and it is determined that an adapter error has been detected.

In addition, as shown using the dotted line in ■, if main body 1 receives a NOP command completion from adapter 2 before an adapter error is detected in ■, the flag is forcibly set to (0, 0, 1). / is reset (in Figure 2, the flag (0, 0,
(1) is forcibly set/reset), and adapter abnormalities such as ■ are not detected.

According to the above procedure, if main unit 1 is flagged (0,010) at timeout, a NOP command will be automatically issued, and correspondingly, NOP command will be issued by the next timeout.
If an OP command completion is not received, it is automatically detected as an adapter abnormality.

〔Effect of the invention〕

As explained above, according to the present invention, the timeout flag 6, the command flag 7, the NoP command flag 8,
and one timer 9 are provided, and these flags are manipulated in response to command issue/completion and timeout notifications from the independently activated timer 9 to monitor errors in the adapter 2. Save on one,
Even when the load is high, the load for adapter monitoring can be minimized without increasing it, and idle responses can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of one embodiment of the present invention, Figs. 2 and 3 are operational flowcharts of the present invention, Figs. 4 and 5 are explanatory diagrams of the operation of the present invention, and Fig. 6 is an explanation of the prior art. Show the diagram. In the figure, ■ is the main body, 2 is the adapter, 3 is the adapter monitoring section,
4 is a command processing section, 5 is a timeout processing section, 6 is a timeout flag (tof), and 7 is a command flag (c
f), 8 represents a NOP command flag (nf), and 9 represents a timer.

Claims (2)

[Claims] (1) In the adapter monitoring method that monitors the adapter, there are a command flag (7) that is set when a command is issued to the adapter (2), and a timeout flag (7) that is set when a timeout occurs.
6) Set the above command flag (7) when issuing a command to adapter (2), and reset the above command flag (7) and the above timeout flag (6) when command completion is received from adapter (2). Triggered by a timeout notification from the timer (9) and the command processing unit (4), it is determined that the adapter is abnormal if the timeout flag (6) is set;
) is not set, the timeout processing unit (5) sets the timeout flag (6) and restarts the timer (9), and is configured to monitor adapter abnormalities. Adapter monitoring method. (2) A new NOP command flag (8) has been created that is reset upon timeout and set each time a command is issued or completed. If the provided NOP command flag (8) has been reset, the timeout flag (6) is set and the NO
When a P command is issued to the adapter (2) and the next timeout notification is triggered, if the timeout flag (6) has not been reset by the completion of the command corresponding to the issuing of the NOP command, it will be determined that the adapter is abnormal. The adapter monitoring method according to item (1), characterized in that: