QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
dev_read question |
| Ref. No. |
QNX.000009249 |
| Category(ies) |
Development |
| Issue |
Suppose I do dev_read until buffer is drained and then a dev_read with proxy pid given. Then I go away and do other stuff. Further, suppose I finish the other stuff before the proxy fires. If I now do another dev_read with proxy arg of zero, will that cancel the prior proxy (and dev_read)? (Specifically concerned with Dev.ser for the moment but also would like the answer in general, if its different.)
My current thought is I should do:
dev_arm(fd, proxy, _DEV_EVENT_INPUT);
before I go off to other stuff, then:
dev_arm(fd, _DEV_DISARM, _DEV_EVENT_INPUT);
dev_read(fd, yada, yada ...
when I get back. Is this about right? |
| Solution |
Yes, that is correct. Although, you might have a proxy pending when you do the disarm and it will still be there for you to Receive() even after you disarm.
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