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Use SIGCHLD with waitpid(); implemented wait() and waitid()

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git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5515 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
2013-01-13 18:53:00 +00:00
parent ffda55b34a
commit b3f3dd123c
23 changed files with 1079 additions and 95 deletions
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nuttx/ChangeLog
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@@ -3922,3 +3922,10 @@
which decrements the lockcount on the wrong TCB. The failure case
that I saw was that pre-emption got disabled in the IDLE thread,
locking up the whole system.
* sched/sched_waitpid.c: Use SIGCHLD instead of a semaphore. This
is a much more spec-compliant implemenation. However, there are
some issues with overruning signals because NuttX does not support
queueing of signals (POSIX does not require it). I think it may
need to.
* sched/sched_waitid.c and sched_wait.c: Add support for waitid()
and wait(). See issues with waitpid() above.