68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
package hak
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/*
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#include <hak.h>
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*/
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import "C"
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import "sync"
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import "weak"
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type Instance struct {
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c *C.hak_t // c object
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g weak.Pointer[Hak] // go object as a weak pointer
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}
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type InstanceTable struct {
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mtx sync.Mutex
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insts []Instance
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free_slots []int
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}
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var inst_table InstanceTable
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func (itab *InstanceTable) add_instance(c *C.hak_t, g *Hak) int {
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itab.mtx.Lock()
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defer itab.mtx.Unlock()
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var n int = len(itab.free_slots)
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if n <= 0 { // no free slots
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itab.insts = append(itab.insts, Instance{c: c, g: weak.Make(g)})
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return len(itab.insts) - 1
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} else {
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var slot int
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n--
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slot = itab.free_slots[n]
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itab.free_slots = itab.free_slots[:n]
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itab.insts[slot].c = c
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return slot
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}
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}
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func (itab *InstanceTable) delete_instance(slot int) Instance {
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var h Instance
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var n int
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itab.mtx.Lock()
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defer itab.mtx.Unlock()
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h = itab.insts[slot]
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itab.insts[slot].c = nil
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itab.insts[slot].g = weak.Make((*Hak)(nil))
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n = len(itab.insts)
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if slot == n-1 {
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itab.insts = itab.insts[:n-1]
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} else {
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itab.free_slots = append(itab.free_slots, slot)
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}
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return h
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}
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func (itab *InstanceTable) slot_to_instance(slot int) Instance {
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itab.mtx.Lock()
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defer itab.mtx.Unlock()
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return itab.insts[slot]
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}
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