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Use of SyncMutexRevive

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Applicable Environment

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Topic: SyncMutexRevive
SDP: 6.4.0
Target: Any supported target

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Recommendation

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Revive a mutex that's in the DEAD state (Mutex owner killed while other thread already MUTEX blocked)

like:

# rm /dev/shmem/myshmemobject ; ./mtxshmemcreator & sleep 1 ; ./user & sleep 1 ; slay -9 mtxshmemcreator

Play with attached sample:
# ls
. mtxshmemcreator.c user.c
.. mutexshmem.h

# make mtxshmemcreator
cc mtxshmemcreator.c -o mtxshmemcreator

# make user
cc user.c -o user

# rm /dev/shmem/myshmemobject ; ./mtxshmemcreator & sleep 1 ; ./user & sleep 1 ; slay -9 mtxshmemcreator
[1] 139558955
[2] 139571245
Locking...
Reviving 0x40100000: 80000001 ffffff00
Ok.
[1] - Killed ./mtxshmemcreator
#

That's it.

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NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns.

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Related Attachments


Attachment Name	Size	Last Modified

syncmutexrevive.zip	4KB	8/23/2012 3:51 PM

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