How to fix PlatformIO mbed error: 'Mutex' does not name a type

Problem:

You are trying to compile your PlatformIO mbed application using Mutexes like

mutex-example.c

Mutex myLock;

Mutex myLock;

but you see an error message like

mutex-error.txt

src\main.cpp:3:1: error: 'Mutex' does not name a type
 Mutex myLock;
 ^~~~~

src\main.cpp:3:1: error: 'Mutex' does not name a type
 Mutex myLock;
 ^~~~~

Add this line to your platformio.ini:

platformio.ini.snippet

build_flags = -D PIO_FRAMEWORK_MBED_RTOS_PRESENT

build_flags = -D PIO_FRAMEWORK_MBED_RTOS_PRESENT

This will enable the RTOS features in mbed, including the Mutex.

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