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Updated reentrancy documentation
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@ -59,7 +59,23 @@ and assigning all parameters to variables as soon as possible. This is slow thou
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A function is interrupt-safe if it can be safely called, either directly or indirectly,
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A function is interrupt-safe if it can be safely called, either directly or indirectly,
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simultaneously by the main code and by an interrupt routine.
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simultaneously by the main code and by an interrupt routine.
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The only way to make a function interrupt-safe is to have no parameters and make all local variables stack-allocated.
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The only way to make a function interrupt-safe is:
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* have either no parameters, or just one parameter passed via registers that is immediately assigned to a local stack-allocated variable
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* if there is a parameter: enable optimizations
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* make all local variables stack-allocated,
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* have a return type that can be returned via registers.
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The size limit on the parameter and the return type depends on architecture:
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* for 6502-like architectures: 2 bytes
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* for 8080-like architectures: 4 bytes
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All built-in functions and operators are designed to be interrupt-safe.
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# Reentrancy safety violations
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# Reentrancy safety violations
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