Changeset 96c30c8 in mainline for kernel/generic/src/ipc/sysipc.c


Ignore:
Timestamp:
2018-06-28T15:45:37Z (7 years ago)
Author:
Jiří Zárevúcky <jiri.zarevucky@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
331d024
Parents:
82453b29
git-author:
Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-28 15:36:29)
git-committer:
Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-28 15:45:37)
Message:

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).

File:
1 edited

Legend:

Unmodified
Added
Removed
  • kernel/generic/src/ipc/sysipc.c

    r82453b29 r96c30c8  
    856856sys_errno_t sys_ipc_poke(void)
    857857{
    858         waitq_unsleep(&TASK->answerbox.wq);
     858        waitq_wakeup(&TASK->answerbox.wq, WAKEUP_FIRST);
    859859        return EOK;
    860860}
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