Changeset ea7890e7 in mainline for kernel/generic/include/proc/thread.h

Timestamp:

2007-06-01T15:47:46Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

07be3c4

Parents:

ff3a34b

Message:

More efficient and simpler task termination.

Based on the assumption, that after its creation, only the task itself can create more threads for itself,
the last thread with userspace context to execute thread_exit() will perform futex and IPC cleanup. When
the task has no threads, it is destroyed. Both the cleanup and destruction is controlled by reference
counting.

As for userspace threads, even though there could be a global garbage collector for joining threads, it is
much simpler if the uinit thread detaches itself before switching to userspace.

task_kill() is now an idempotent operation. It just instructs the threads within a task to exit.

Change in the name of a thread state: Undead → JoinMe.

File:

• kernel/generic/include/proc/thread.h (modified) (4 diffs)

kernel/generic/include/proc/thread.h

@@ -1 +1 @@
 /*
- * Copyright (c) 2001-2004 Jakub Jermar
+ * Copyright (c) 2001-2007 Jakub Jermar
  * All rights reserved.
  *
@@ -41 +41 @@
 #include <cpu.h>
 #include <synch/rwlock.h>
+#include <synch/spinlock.h>
 #include <adt/btree.h>
 #include <mm/slab.h>
@@ -81 +82 @@
         /** After a thread calls thread_exit(), it is put into Exiting state. */
         Exiting,
-        /** Threads that were not detached but exited are in the Undead state. */
-        Undead
+        /** Threads that were not detached but exited are in the JoinMe state. */
+        JoinMe
 } state_t;
-
-/** Join types. */
-typedef enum {
-        None,
-        TaskClnp,       /**< The thread will be joined by ktaskclnp thread. */
-        TaskGC          /**< The thread will be joined by ktaskgc thread. */
-} thread_join_type_t;
 
 /** Thread structure. There is one per thread. */
@@ -153 +147 @@
         bool interrupted;                       
         
-        /** Who joinins the thread. */
-        thread_join_type_t join_type;
         /** If true, thread_join_timeout() cannot be used on this thread. */
         bool detached;
         /** Waitq for thread_join_timeout(). */
         waitq_t join_wq;
+        /** Link used in the joiner_head list. */
+        link_t joiner_link;
 
         fpu_context_t *saved_fpu_context;