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Merge pull request #234 from qzhuyan/dev/william/fix-build
fix(build): remove workaround for emqx
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Original file line number | Diff line number | Diff line change |
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# Design Decisions | ||
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This doc contains design decisions we have made and provides some insights about background and reasons | ||
For each decision. | ||
for each decision. | ||
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If you don't agree with the decision or causing issue, please refer to the chapter number in the issue report. | ||
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# Decisions | ||
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## Resources Managements | ||
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1. Connection or Stream should not cross references | ||
For example, in `s_ctx` it should not have a field `c_ctx`, because stream callback can still get called | ||
While the `connection` in `c_ctx` is closed due to a close call, is asynchronous. | ||
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To avoid getting access to an invalid handle (already closed), there should be no cross references among these resources. | ||
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Access to invalid handles could lead to undefined behavior in MsQuic that includes segfault or abort due to assertions. | ||
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However, keep ref counting is still required to avoid the MsQuic handle getting closed too early (it is still in use). | ||
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1. MsQuic handle | ||
All MsQuic handles should be only closed in resource dealloc callback. | ||
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For tracking resources usage, quicer do not do refcnt on MsQuic handles, instead it relies on the Erlang garbage | ||
Collection mechanism to track the refcnt on the MsQuic handle. | ||
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To inc refcnt use: | ||
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``` c | ||
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enif_make_resource | ||
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// OR | ||
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enif_keep_resource | ||
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``` | ||
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To dec refcnt use: | ||
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`enif_release_resource` | ||
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*CONS* | ||
- The resources are not closed/freed until the GC kicks in, that means the releasing resources will be delayed. | ||
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This behavior also aligns with the delayed GC in BEAM. | ||
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- It also requires in the Erlang process not to keep the unused/closed resources in the stack/heap, | ||
otherwise it will cause memory leaks. | ||
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## Send message to the owner | ||
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1. Messages with boxed types are copied to the owner's mailbox. |
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