Yes, it's immediate.
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From: Robert Murrell [community-noreply@qnx.com]
Sent: November 25, 2015 8:57 AM
To: ostech-core_os
Subject: When does _NTO_TCTL_RUNMASK take effect?

Does the ThreadCtl _NTO_TCTL_RUNMASK take effect immediately?  Say my thread is running on CPU 1 and I call ThreadCtl to
 set it to run on CPU 0 only.  Am I guaranteed that my thread is running on CPU 0 when ThreadCtl returns?




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OSTech
http://community.qnx.com/sf/go/post115112
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