Mbed_critical utils as RAII-style class

Mbed OS
3

Ah thank you! This is almost exactly what I need :slight_smile:

The example uses:

void increment(void)
{
    for (int i = 0; i < value; i++) {
#if (USE_CRITICAL_SECTION_LOCK == 1)
        CriticalSectionLock  lock;        // <----HERE
#endif
        counter += 1;
    }
}

It works but I find it strange that you need to instantiate an object to lock a critical section. Unless you look at the implementation, there is no way to know what is does:

CriticalSectionLock::CriticalSectionLock()
{
    core_util_critical_section_enter();
}

CriticalSectionLock::~CriticalSectionLock()
{
    core_util_critical_section_exit();
}

I still would prefer the “standard” way:

class CircularBuffer {
  public:
    auto pop(T& data) -> bool
    {
        const std::lock_guard<mbed::CriticalSectionLock> lock(_lock); 
        // ...
    }

  private:
    CriticalSectionLock _lock {};
}

If that makes sense.

It’s just a simple PR to add lock() and unlock() to CriticalSection