wehub-resource-sync
36 lines
1.5 KiB
Go
36 lines
1.5 KiB
Go
package plugin
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import (
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"fmt"
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"sync/atomic"
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)
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// maxCodeGraphInstances caps how many CodeGraph indexer subprocesses may run
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// concurrently across the whole process. Each tab/session boots its own plugin
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// Host (desktop/tabs.go, boot.go), so opening many tabs on large projects used
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// to spawn one full-tree indexer per tab — exhausting file descriptors and
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// freezing the machine (#4361, #2992, #3797). A hard cap bounds the blast
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// radius: once reached, additional CodeGraph instances refuse to start and the
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// agent degrades to grep/glob, which is the documented manual workaround
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// (`[codegraph] enabled = false`) applied automatically instead of a crash.
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const maxCodeGraphInstances = 4
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var liveCodeGraphInstances atomic.Int32
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// acquireCodeGraphSlot reserves one of the bounded CodeGraph instance slots.
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// It returns a release func (idempotent) and an error when the cap is reached.
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// The cap only governs CodeGraph; every other stdio plugin is unaffected.
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func acquireCodeGraphSlot() (func(), error) {
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n := liveCodeGraphInstances.Add(1)
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if n > maxCodeGraphInstances {
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liveCodeGraphInstances.Add(-1)
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return nil, fmt.Errorf("codegraph: %d instances already running (cap %d); not starting another to avoid file-descriptor exhaustion — close some tabs/sessions or set codegraph off for this one", n-1, maxCodeGraphInstances)
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}
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var released atomic.Bool
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return func() {
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if released.CompareAndSwap(false, true) {
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liveCodeGraphInstances.Add(-1)
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}
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}, nil
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}
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