enhance: [2.4] Add dynamic cgo pool for proxy CGO call (#34768) (#34842)

Cherry-pick from master
pr: #34768
Related to #34705

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/proxy/cgo_util.go

@@ -24,15 +24,53 @@ package proxy
 import "C"
 
 import (
+	"runtime"
+	"sync"
 	"unsafe"
 
+	"go.uber.org/atomic"
+	"go.uber.org/zap"
+
 	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
+	"github.com/milvus-io/milvus/pkg/log"
+	"github.com/milvus-io/milvus/pkg/util/conc"
+	"github.com/milvus-io/milvus/pkg/util/hardware"
 )
 
-func CheckVecIndexWithDataTypeExist(name string, dType schemapb.DataType) bool {
-	cIndexName := C.CString(name)
-	cType := uint32(dType)
-	defer C.free(unsafe.Pointer(cIndexName))
-	check := bool(C.CheckVecIndexWithDataType(cIndexName, cType))
-	return check
+var (
+	dp      atomic.Pointer[conc.Pool[any]]
+	dynOnce sync.Once
+)
+
+func initDynamicPool() {
+	dynOnce.Do(func() {
+		pool := conc.NewPool[any](
+			hardware.GetCPUNum(),
+			conc.WithPreAlloc(false),
+			conc.WithDisablePurge(false),
+			conc.WithPreHandler(runtime.LockOSThread), // lock os thread for cgo thread disposal
+		)
+
+		dp.Store(pool)
+		log.Info("init dynamicPool done", zap.Int("size", hardware.GetCPUNum()))
+	})
+}
+
+// GetDynamicPool returns the singleton pool for dynamic cgo operations.
+func GetDynamicPool() *conc.Pool[any] {
+	initDynamicPool()
+	return dp.Load()
+}
+
+func CheckVecIndexWithDataTypeExist(name string, dType schemapb.DataType) bool {
+	var result bool
+	GetDynamicPool().Submit(func() (any, error) {
+		cIndexName := C.CString(name)
+		cType := uint32(dType)
+		defer C.free(unsafe.Pointer(cIndexName))
+		result = bool(C.CheckVecIndexWithDataType(cIndexName, cType))
+		return nil, nil
+	}).Await()
+
+	return result
 }