去你妈的线程池，新增use_thread_pool参数

src/configuration.rs

@@ -14,7 +14,8 @@ pub struct Configuration {
     spam_file: String,
     spam_delay_ms: i32,
     random_prefix: bool,
-    pub worker_threads: i32
+    pub worker_threads: i32,
+    pub use_thread_pool: bool
 }
 
 impl Configuration {
@@ -57,7 +58,8 @@ impl Configuration {
             spam_file: "".to_string(),
             spam_delay_ms: 0,
             random_prefix: false,
-            worker_threads: 100
+            worker_threads: 100,
+            use_thread_pool: true
         }
     }