vTaskDelete() while select()

[Franck.f]

Is it ok to delete a task (vTaskDelete) that is blocked in a select() call ?

[Sprite]

I don't think so. In general, it's good practice to only use vTaskDelete to make a task stop itself. If you delete another task, it may be in a state where it took some resource (for instance, malloc()'ed a temporary variable somewhere) and deleting the task will leak that resource.

[MicroController]

Unfortunately, FreeRTOS doesn't provide any clean/safe/defined way to interrupt a blocking function like select().
There's xTaskAbortDelay(), which would be up to the task, but it's implemented with an inherent race condition, so not safe/reliable.

The HTTPD component works around the issue by using an additional (local) socket just to be able to get another task out of blocking in a select().