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Nov 17, 2021
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Document that cfunctions should not throw errors #43100

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Document that cfunctions should not throw errors
simonbyrne Nov 16, 2021
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Update doc/src/manual/calling-c-and-fortran-code.md
simonbyrne Nov 16, 2021
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4 changes: 4 additions & 0 deletions doc/src/manual/calling-c-and-fortran-code.md
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Expand Up @@ -186,6 +186,10 @@ Julia function. The arguments to [`@cfunction`](@ref) are:
function on 32-bit Windows, but can be used on WIN64 (where `stdcall` is unified with the
C calling convention).

!!! note
Callback functions exposed via `@cfunction` should not throw errors, as that will
return control to the Julia runtime unexpectedly and may leave the program in an undefined state.

A classic example is the standard C library `qsort` function, declared as:

```c
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