#336 MD structures handling in multithread application

[Kari Keinanen]

If application has 2 threads and thread-1 is calling tlm_process() and at the same time thread-2 is calling tlm_notify() (might also apply other API-calls), threads might modify same resource.
Based on debugging in Linux and MD UDP notification, tlm_process() is sometimes closing the same socket than tlm_notify() is still trying to use.

Code snapshot below:

tlm_process ()
    ...
    if (vos_mutexLock(appHandle->mutexMD) != VOS_NO_ERR)
    ...

tlm_notify ()
    ...
    trdp_mdCall()
    ...

trdp_mdCall ()
    ...
    /* KK: should the lock be appHandle->mutexMD ? */
    if ( vos_mutexLock(appHandle->mutex) != VOS_NO_ERR )

[Bernd Löhr]

yes, it should ;-)