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libs/libc/wqueue/work_usrthread.c: Eliminate a race condition noted by Xiang Xiao.

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This commit is contained in:
Gregory Nutt 2018-09-14 07:51:31 -06:00
parent 3a65d39eb8
commit 49e725625a
1 changed files with 9 additions and 1 deletions
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10
libs/libc/wqueue/work_usrthread.c
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@ -255,6 +255,14 @@ void work_process(FAR struct usr_wqueue_s *wqueue)
}
}
/* Unlock the work queue before waiting. In order to assure that these
* operations are atomic with respect to other user tasks, we disable
* pre-emption here. Pre-emption will be re-enabled while we sleep.
*/
sched_lock();
work_unlock();
if (next == WORK_DELAY_MAX)
{
sigset_t set;
@ -276,7 +284,7 @@ void work_process(FAR struct usr_wqueue_s *wqueue)
usleep(next * USEC_PER_TICK);
}
work_unlock();
sched_unlock();
}
/****************************************************************************