src/Pure/Concurrent/standard_thread.scala

--- a/src/Pure/Concurrent/standard_thread.scala	Wed Apr 08 12:28:42 2020 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,108 +0,0 @@
-/*  Title:      Pure/Concurrent/standard_thread.scala
-    Author:     Makarius
-
-Standard thread operations.
-*/
-
-package isabelle
-
-
-import java.lang.Thread
-import java.util.concurrent.{ThreadPoolExecutor, TimeUnit, LinkedBlockingQueue, ThreadFactory}
-
-
-object Standard_Thread
-{
-  /* fork */
-
-  def fork(name: String = "", daemon: Boolean = false)(body: => Unit): Thread =
-  {
-    val thread =
-      if (name == null || name == "") new Thread() { override def run = body }
-      else new Thread(name) { override def run = body }
-    thread.setDaemon(daemon)
-    thread.start
-    thread
-  }
-
-
-  /* pool */
-
-  lazy val pool: ThreadPoolExecutor =
-    {
-      val m = Value.Int.unapply(System.getProperty("isabelle.threads", "0")) getOrElse 0
-      val n = if (m > 0) m else (Runtime.getRuntime.availableProcessors max 1) min 8
-      val executor =
-        new ThreadPoolExecutor(n, n, 2500L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue[Runnable])
-      val old_thread_factory = executor.getThreadFactory
-      executor.setThreadFactory(
-        new ThreadFactory {
-          def newThread(r: Runnable) =
-          {
-            val thread = old_thread_factory.newThread(r)
-            thread.setDaemon(true)
-            thread
-          }
-        })
-      executor
-    }
-
-
-  /* delayed events */
-
-  final class Delay private[Standard_Thread](
-    first: Boolean, delay: => Time, log: Logger, event: => Unit)
-  {
-    private var running: Option[Event_Timer.Request] = None
-
-    private def run: Unit =
-    {
-      val do_run = synchronized {
-        if (running.isDefined) { running = None; true } else false
-      }
-      if (do_run) {
-        try { event }
-        catch { case exn: Throwable if !Exn.is_interrupt(exn) => log(Exn.message(exn)); throw exn }
-      }
-    }
-
-    def invoke(): Unit = synchronized
-    {
-      val new_run =
-        running match {
-          case Some(request) => if (first) false else { request.cancel; true }
-          case None => true
-        }
-      if (new_run)
-        running = Some(Event_Timer.request(Time.now() + delay)(run))
-    }
-
-    def revoke(): Unit = synchronized
-    {
-      running match {
-        case Some(request) => request.cancel; running = None
-        case None =>
-      }
-    }
-
-    def postpone(alt_delay: Time): Unit = synchronized
-    {
-      running match {
-        case Some(request) =>
-          val alt_time = Time.now() + alt_delay
-          if (request.time < alt_time && request.cancel) {
-            running = Some(Event_Timer.request(alt_time)(run))
-          }
-        case None =>
-      }
-    }
-  }
-
-  // delayed event after first invocation
-  def delay_first(delay: => Time, log: Logger = No_Logger)(event: => Unit): Delay =
-    new Delay(true, delay, log, event)
-
-  // delayed event after last invocation
-  def delay_last(delay: => Time, log: Logger = No_Logger)(event: => Unit): Delay =
-    new Delay(false, delay, log, event)
-}