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Merged
merged 7 commits into from
Oct 30, 2017
Merged

Critical Section doc update #298

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Critical Section doc update
Oct 20, 2017
38c98e9
Copy edit CriticalSectionLock.md
Oct 20, 2017
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Changed example repo
Oct 23, 2017
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Make minor capitalization change
Oct 23, 2017
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Added RAII approach and scope description
Oct 25, 2017
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Copy edit CriticalSectionLock.md
Oct 30, 2017
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Oct 30, 2017
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12 changes: 12 additions & 0 deletions docs/reference/api/platform/CriticalSectionLock.md
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## CriticalSectionLock

CriticalSectionLock class provides a mechanism to access a resource uniterrupted. With the `lock` API, you can enter critical section with interrupts disabled. The `unlock` API is the exit from critical section, and the state of interrupts is restored upon exit. Nesting of critical section is supported, and interrupts are enabled only when we exit from last nested critical section.
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uninterrupted or without interruption? Anything about RAII usage or scope?


<span class="notes">**Note:** You must not use time consuming operations, standard library and RTOS functions inside critical section.</span>

## CriticalSectionLock class reference

[![View code](https://www.mbed.com/embed/?type=library)](https://os.mbed.com/docs/v5.6/mbed-os-api-doxy/classmbed_1_1_critical_section_lock.html)

## CriticalSectionLock example

Here is an example that demonstrates a race condition issue and how CriticalSectionLock helps resolves it.

[![View code](https://www.mbed.com/embed/?url=https://os.mbed.com/teams/mbed_example/code/mbed-os-example-critical-section/)](https://os.mbed.com/teams/mbed_example/code/mbed-os-example-critical-section/file/a88acbffd78b/main.cpp)