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Co-authored-by: Henrik Tjäder <henrik@tjaders.com>
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book/en/src/internals/targets.md
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@ -53,7 +53,7 @@ showing two tasks A and B where A has higher priority but shares a resource with
At time *t1*, task B locks the shared resource by selectively disabling all other tasks which share At time *t1*, task B locks the shared resource by selectively disabling all other tasks which share
the resource using the NVIC. In effect this raises the virtual priority ceiling. Task A is one such the resource using the NVIC. In effect this raises the virtual priority ceiling. Task A is one such
task that shares resources with task B. At time *t2*, task A is either spawned by task B or becomes task that shares resources with task B. At time *t2*, task A is either spawned by task B or becomes
pending through an interrupt condition, but does not yet preempt task B even though it's priority is pending through an interrupt condition, but does not yet preempt task B even though its priority is
greater. This is because the NVIC is preventing it from starting due to task A's source mask being greater. This is because the NVIC is preventing it from starting due to task A's source mask being
disabled. At time *t3*, task B releases the lock by re-enabling the tasks in the NVIC. Because disabled. At time *t3*, task B releases the lock by re-enabling the tasks in the NVIC. Because
task A was pending and has a higher priority than task B, it immediately preempts task B and is task A was pending and has a higher priority than task B, it immediately preempts task B and is