Fix: update calls to runtime.fastrand to use cheaprand for compat…

…ibility with Go 1.22

In Golang 1.22, the `runtime.fastrand` method was renamed to `cheaprand`.
This commit updates all occurrences of `runtime.fastrand` in the project
to use the new `cheaprand` method to maintain compatibility with the latest
Golang version and address performance concerns.

Refer: https://gist.github.com/Aoang/3dc06f127f3f54507b7e06b7b6550c28

internal/xruntime/runtime.go

@@ -1,3 +1,5 @@
+//go:build !go1.22
+
 // Copyright (c) 2023 Alexey Mayshev. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -15,25 +17,9 @@
 package xruntime
 
 import (
-	"runtime"
 	_ "unsafe"
 )
 
-const (
-	// CacheLineSize is useful for preventing false sharing.
-	CacheLineSize = 64
-)
-
-// Parallelism returns the maximum possible number of concurrently running goroutines.
-func Parallelism() uint32 {
-	maxProcs := uint32(runtime.GOMAXPROCS(0))
-	numCPU := uint32(runtime.NumCPU())
-	if maxProcs < numCPU {
-		return maxProcs
-	}
-	return numCPU
-}
-
 //go:noescape
 //go:linkname Fastrand runtime.fastrand
 func Fastrand() uint32

internal/xruntime/runtime_1.22.go

@@ -0,0 +1,25 @@
+//go:build go1.22
+
+// Copyright (c) 2023 Alexey Mayshev. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package xruntime
+
+import (
+	_ "unsafe"
+)
+
+//go:noescape
+//go:linkname Fastrand runtime.cheaprand
+func Fastrand() uint32

internal/xruntime/xruntime.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2023 Alexey Mayshev. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package xruntime
+
+import (
+	"runtime"
+)
+
+const (
+	// CacheLineSize is useful for preventing false sharing.
+	CacheLineSize = 64
+)
+
+// Parallelism returns the maximum possible number of concurrently running goroutines.
+func Parallelism() uint32 {
+	maxProcs := uint32(runtime.GOMAXPROCS(0))
+	numCPU := uint32(runtime.NumCPU())
+	if maxProcs < numCPU {
+		return maxProcs
+	}
+	return numCPU
+}