// backend\tasks_exclusive.go

package main

import (
	"context"
)

var exclusiveTaskSem = make(chan struct{}, 1)

func init() {
	exclusiveTaskSem <- struct{}{}
}

func acquireExclusiveTask(ctx context.Context) error {
	if ctx == nil {
		ctx = context.Background()
	}

	select {
	case <-ctx.Done():
		return ctx.Err()
	case <-exclusiveTaskSem:
		return nil
	}
}

func releaseExclusiveTask() {
	select {
	case exclusiveTaskSem <- struct{}{}:
	default:
	}
}