# How to keep a reference for C structure to avoid GC?

**URL:** <https://discourse.julialang.org/t/how-to-keep-a-reference-for-c-structure-to-avoid-gc/9310>\
**Category:** General Usage\
**Created:** [February 25, 2018, 7:10am UTC](https://discourse.julialang.org/t/how-to-keep-a-reference-for-c-structure-to-avoid-gc/9310 "2018-02-25T07:10:06Z")\
**Posts on this page:** 1\
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**Author:** ![yuyichao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yuyichao/32/20_2.png) [@yuyichao](https://discourse.julialang.org/u/yuyichao)\
**Post date:** [February 25, 2018, 1:31pm UTC](https://discourse.julialang.org/t/how-to-keep-a-reference-for-c-structure-to-avoid-gc/9310/3 "2018-02-25T13:31:39Z")

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Don’t use a global dict, that’s not generic and is the slowest possible solution.

What you can use depends on how you are calling the C code. A possible solution that should work in most cases is [https://github.com/JuliaPy/PyCall.jl/blob/314ac274326e78f12fbcb73ae0f17f63a3f4bba9/src/pytype.jl#L314](https://github.com/JuliaPy/PyCall.jl/blob/314ac274326e78f12fbcb73ae0f17f63a3f4bba9/src/pytype.jl#L314)

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