| commit | 96c30c81327e058d9ccd42a8628f09c4f75b398a | |
| author | Jiří Zárevúcky <jiri.zarevucky@nic.cz> | |
| Thu, 28 Jun 2018 15:36:29 +0000 (28 17:36 +0200) | ||
| committer | Jiří Zárevúcky <jiri.zarevucky@nic.cz> | |
| Thu, 28 Jun 2018 15:45:37 +0000 (28 17:45 +0200) | ||
| tree | 3699a0f95305e2ef72c031078fe2978414ac6e55 | treesnapshot (tar.gz zip) |
| parent | 82453b290d023987999898c01e25bbb3b086b3bb | commitdiff |
Turn ipc_poke() into a regular wakeup on the waitq.
With prior behavior of ignoring the poke when no thread is blocking,
a thread could go to sleep just after a poke meant for it and sleep
indefinitely despite there being work to do.
After the change, worst case scenario, thread enters ipc wait, exits
immediately due to a previous poke, finds no work to do and enters ipc wait
again (possibly repeating the spurious wakeup a few times).
With prior behavior of ignoring the poke when no thread is blocking,
a thread could go to sleep just after a poke meant for it and sleep
indefinitely despite there being work to do.
After the change, worst case scenario, thread enters ipc wait, exits
immediately due to a previous poke, finds no work to do and enters ipc wait
again (possibly repeating the spurious wakeup a few times).