| commit | 02de327cf75ac7cb0378aa3e7000c1b6fb04efb6 | [log] [tgz] |
|---|---|---|
| author | Cindy Chen <chencindy@google.com> | Mon Aug 10 11:08:48 2020 -0700 |
| committer | cindychip <cindy.chen0316@gmail.com> | Tue Aug 11 11:36:37 2020 -0700 |
| tree | f1c723f60f5d7b83399810a77c686f2e7b20a617 | |
| parent | 0a21779ee56b216b456ddc681b6a327adb02e5a1 [diff] |
[dv/alert_driver] semaphore fix The semaphore is used to limit the access to use send alert, and make sure each alert handshake are two clock cycle apart. But previous implementation has scheduler issues as below: ``` fork thread 1: send_alert thread 2: reset join_any disable fork; 1) semaphore try_get 2) semaphore release ---> if other thread get it during line 1) and 2) here, then it will release the semaphore from other thread. ``` The reason i implemented line 1) and 2) is to handle the logic when reset is issue during send_alert, then the code is still able to release semaphore. However, I did not count for the case when alert_send (thread 1) is finished, and other thread is trying to acquire the semaphore. The solution in this PR is to move the try_get and release to a separate reset thread. Signed-off-by: Cindy Chen <chencindy@google.com>
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