jiapengyu
31 lines
1.1 KiB
C++
31 lines
1.1 KiB
C++
#ifndef REFERENCE_COUNTER_H
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#define REFERENCE_COUNTER_H
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#include <unordered_map>
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#include "lock_master.h"
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// There are certain instances in libgit2 which can be retrieved from multiple sources
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// We need to make sure that we're counting how many times we've seen that pointer
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// so that when we are performing free behavior, we don't free it until it is no longer
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// referenced. The main example of this behavior is the repository instance, where
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// after git_repository_open open (first instance) we can git_commit_lookup, followed by
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// git_commit_owner (second instance).
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//
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// I was hoping that we could construct a Persistent handle, but that would interfere with
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// GC. We want it to attmept to GC, and if this handle exists, the final repo will not
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// free itself :(.
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//
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// Make sure to utilize LockMaster when incrementing or decrementing a reference count.
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class ReferenceCounter {
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public:
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static void incrementCountForPointer(void *ptr);
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static unsigned long decrementCountForPointer(void *ptr);
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private:
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static std::unordered_map<void *, unsigned long> referenceCountByPointer;
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};
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#endif
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