From 78a4b9ed4b3f9d5533e058722b6ae51c7aa51f1e Mon Sep 17 00:00:00 2001 From: nobody Date: Wed, 14 Oct 1998 05:31:07 +0000 Subject: This commit was manufactured by cvs2svn to create tag 'ACE-4_5_53'. --- java/src/Stream.java | 438 --------------------------------------------------- 1 file changed, 438 deletions(-) delete mode 100644 java/src/Stream.java (limited to 'java/src/Stream.java') diff --git a/java/src/Stream.java b/java/src/Stream.java deleted file mode 100644 index 030114d092f..00000000000 --- a/java/src/Stream.java +++ /dev/null @@ -1,438 +0,0 @@ -/************************************************* - * - * = PACKAGE - * JACE.ASX - * - * = FILENAME - * Stream.java - * - *@author Prashant Jain - * - *************************************************/ -package JACE.ASX; - -import JACE.OS.*; - -/** - *
- *

SYNOPSIS

- *
- * This class is the primary abstraction for the ASX framework. - * It is moduled after System V Stream. - *
- * - *

DESCRIPTION

- *
- * A Stream consists of a stack of , each of which - * contains two . - *
- */ - -public class Stream -{ - - public Stream () - { - this (null, null, null); - } - - // Create a Stream consisting of and as the Stream - // head and Stream tail, respectively. If these are 0 then the - // and are used, respectively. - // is the value past in to the open() methods of the tasks. - - public Stream (Object a, - Module head, - Module tail) - { - this.linkedUs_ = null; - // this.final_close_ = this.lock_; - - if (this.open (a, head, tail) == -1) - ACE.ERROR ("open" + head.name () + " " + tail.name ()); - } - - public int push (Module newTop) - { - if (this.pushModule (newTop, - this.streamHead_.next (), - this.streamHead_) == -1) - return -1; - else - return 0; - } - - public int put (MessageBlock mb, TimeValue tv) - { - return this.streamHead_.writer ().put (mb, tv); - } - - public MessageBlock get (TimeValue tv) throws InterruptedException - { - return this.streamHead_.reader ().getq (tv); - } - -// Return the "top" ACE_Module in a ACE_Stream, skipping over the -// stream_head. - - public Module top () - { - if (this.streamHead_.next () == this.streamTail_) - return null; - else - return this.streamHead_.next (); - } - -// Remove the "top" ACE_Module in a ACE_Stream, skipping over the -// stream_head. - - public int pop (long flags) - { - if (this.streamHead_.next () == this.streamTail_) - return -1; - else - { - // Skip over the ACE_Stream head. - Module top = this.streamHead_.next (); - Module newTop = top.next (); - - this.streamHead_.next (newTop); - - // Close the top ACE_Module. - - top.close (flags); - - this.streamHead_.writer ().next (newTop.writer ()); - newTop.reader ().next (this.streamHead_.reader ()); - - return 0; - } - } - -// Remove a named ACE_Module from an arbitrary place in the -// ACE_Stream. - - public int remove (String name, long flags) - { - Module prev = null; - - for (Module mod = this.streamHead_; - mod != null; mod = mod.next ()) - if (name.compareTo (mod.name ()) == 0) - { - if (prev == null) // Deleting ACE_Stream Head - this.streamHead_.link (mod.next ()); - else - prev.link (mod.next ()); - - mod.close (flags); - return 0; - } - else - prev = mod; - - return -1; - } - - public Module find (String name) - { - for (Module mod = this.streamHead_; - mod != null; - mod = mod.next ()) - if (name.compareTo (mod.name ()) == 0) - return mod; - - return null; - } - -// Actually push a module onto the stack... - - private int pushModule (Module newTop, - Module currentTop, - Module head) - { - Task ntReader = newTop.reader (); - Task ntWriter = newTop.writer (); - Task ctReader = null; - Task ctWriter = null; - - if (currentTop != null) - { - ctReader = currentTop.reader (); - ctWriter = currentTop.writer (); - ctReader.next (ntReader); - } - - ntWriter.next (ctWriter); - - if (head != null) - { - if (head != newTop) - head.link (newTop); - } - else - ntReader.next (null); - - newTop.next (currentTop); - - if (ntReader.open (newTop.arg ()) == -1) - return -1; - - if (ntWriter.open (newTop.arg ()) == -1) - return -1; - return 0; - } - - public synchronized int open (Object a, - Module head, - Module tail) - { - Task h1 = null, h2 = null; - Task t1 = null, t2 = null; - - if (head == null) - { - h1 = new StreamHead (); - h2 = new StreamHead (); - head = new Module ("ACEStreamHead", h1, h2, a); - } - - if (tail == null) - { - t1 = new StreamTail (); - t2 = new StreamTail (); - tail = new Module ("ACEStreamTail", - t1, t2, a); - } - - // Make sure *all* the allocation succeeded! - if (h1 == null || h2 == null || head == null - || t1 == null || t2 == null || tail == null) - { - // Close up! - head.close (0); - tail.close (0); - return -1; - } - - this.streamHead_ = head; - this.streamTail_ = tail; - - if (this.pushModule (this.streamTail_, - null, null) == -1) - return -1; - else if (this.pushModule (this.streamHead_, - this.streamTail_, - this.streamHead_) == -1) - return -1; - else - return 0; - } - - public synchronized int close (long flags) - { - if (this.streamHead_ != null - && this.streamTail_ != null) - { - // Don't bother checking return value here. - this.unlinkInternal (); - - int result = 0; - - // Remove and cleanup all the intermediate modules. - - while (this.streamHead_.next () != this.streamTail_) - { - if (this.pop (flags) == -1) - result = -1; - } - - // Clean up the head and tail of the stream. - if (this.streamHead_.close (flags) == -1) - result = -1; - if (this.streamTail_.close (flags) == -1) - result = -1; - - this.streamHead_ = null; - this.streamTail_ = null; - - // Tell all threads waiting on the close that we are done. - // this.final_close_.broadcast (); - return result; - } - return 0; - } - - public int control (int cmd, Object a) throws InterruptedException - { - IOCntlMsg ioc = new IOCntlMsg (cmd); - - // Create a data block that contains the user-supplied data. - MessageBlock db = - new MessageBlock (MessageType.MB_IOCTL, - null, - a); - - // Create a control block that contains the control field and a - // pointer to the data block. - MessageBlock cb = - new MessageBlock (MessageType.MB_IOCTL, - db, - (Object) ioc); - - int result = 0; - - if (this.streamHead_.writer ().put (cb, new TimeValue ()) == -1) - result = -1; - else if ((cb = this.streamHead_.reader ().getq (new TimeValue ())) == null) - result = -1; - else - result = ((IOCntlMsg ) cb.obj ()).rval (); - - return result; - } - -// Link two streams together at their bottom-most Modules (i.e., the -// one just above the Stream tail). Note that all of this is premised -// on the fact that the Stream head and Stream tail are non-NULL... -// This must be called with locks held. - - private int linkInternal (Stream us) - { - this.linkedUs_ = us; - // Make sure the other side is also linked to us! - us.linkedUs_ = this; - - Module myTail = this.streamHead_; - - if (myTail == null) - return -1; - - // Locate the module just above our Stream tail. - while (myTail.next () != this.streamTail_) - myTail = myTail.next (); - - Module otherTail = us.streamHead_; - - if (otherTail == null) - return -1; - - // Locate the module just above the other Stream's tail. - while (otherTail.next () != us.streamTail_) - otherTail = otherTail.next (); - - // Reattach the pointers so that the two streams are linked! - myTail.writer ().next (otherTail.reader ()); - otherTail.writer ().next (myTail.reader ()); - return 0; - } - - public synchronized int link (Stream us) - { - return this.linkInternal (us); - } - -// Must be called with locks held... - - private int unlinkInternal () - { - // Only try to unlink if we are in fact still linked! - - if (this.linkedUs_ != null) - { - Module myTail = this.streamHead_; - - // Only relink if we still exist! - if (myTail != null) - { - // Find the module that's just before our stream tail. - while (myTail.next () != this.streamTail_) - myTail = myTail.next (); - - // Restore the writer's next() link to our tail. - myTail.writer ().next (this.streamTail_.writer ()); - } - - Module otherTail = this.linkedUs_.streamHead_; - - // Only fiddle with the other side if it in fact still remains. - if (otherTail != null) - { - while (otherTail.next () != this.linkedUs_.streamTail_) - otherTail = otherTail.next (); - - otherTail.writer ().next (this.linkedUs_.streamTail_.writer ()); - - } - - // Make sure the other side is also aware that it's been unlinked! - this.linkedUs_.linkedUs_ = null; - - this.linkedUs_ = null; - return 0; - } - else - return -1; - } - - public synchronized int unlink () - { - return this.unlinkInternal (); - } - - public void dump () - { - ACE.DEBUG ("-------- module links --------"); - - for (Module mp = this.streamHead_; ; mp = mp.next ()) - { - ACE.DEBUG ("module name = " + mp.name ()); - if (mp == this.streamTail_) - break; - } - - ACE.DEBUG ("-------- writer links --------"); - - Task tp; - - for (tp = this.streamHead_.writer (); ; tp = tp.next ()) - { - ACE.DEBUG ("writer queue name = " + tp.name ()); - tp.dump (); - ACE.DEBUG ("-------\n"); - if (tp == this.streamTail_.writer () - || (this.linkedUs_ != null && tp == this.linkedUs_.streamHead_.reader ())) - break; - } - - ACE.DEBUG ("-------- reader links --------\n"); - for (tp = this.streamTail_.reader (); ; tp = tp.next ()) - { - ACE.DEBUG ("reader queue name = " + tp.name ()); - tp.dump (); - ACE.DEBUG ("-------\n"); - if (tp == this.streamHead_.reader () - || (this.linkedUs_ != null && tp == this.linkedUs_.streamHead_.writer ())) - break; - } - } - - Module streamHead_ = null; - // Pointer to the head of the stream. - - Module streamTail_ = null; - // Pointer to the tail of the stream. - - Stream linkedUs_ = null; - // Pointer to an adjoining linked stream. - - // = Synchronization objects used for thread-safe streams. - // ACE_SYNCH_MUTEX lock_; - // Protect the stream against race conditions. - - // ACE_SYNCH_CONDITION final_close_; - // Use to tell all threads waiting on the close that we are done. - -} - - -- cgit v1.2.1