12000-310 | ADEPT| Ethernet driver module

Description

12000-310 | ADEPT| Ethernet driver module

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Technically speaking, the 12000-310 of non reentrant functionality is a special case of contention issues. Moreover, due to related reasons, runtime errors caused by non reentrant functions usually do not occur in a reproducible way – making them equally difficult to debug. Unfortunately, non reentry features are also more difficult to detect in code review than other types of competitive conditions.
Figure 2 shows a typical scenario. Here, the software entities to be preempted are also RTOS tasks. However, they operate indirectly through function calls rather than directly calling shared objects.

For example, suppose Task A 12000-310 the socket layer protocol function, which calls the TCP layer protocol function and the IP layer protocol function, which calls the Ethernet driver program. In order for the system to operate reliably, all these functions must be reentrant.
However, all functions of the Ethernet driver operate on the same global object in the form of registers on the Ethernet controller chip. If preemption is allowed during these register operations, task B can preempt task A after queuing packet A but before sending begins.
Then, 12000-310 B calls the socket layer function, which calls the TCP layer function and then the IP layer function, which calls the Ethernet driver program. This queue queues and transmits the data packet B.

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