Changeset 5573942 in mainline for kernel/generic/src/synch/waitq.c

Timestamp:

2007-02-04T11:46:18Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

15819e37

Parents:

cf5ddf6

Message:

Revert thread_interrupt_sleep() to waitq_interrupt_sleep().
I'd prefer that this, IMO, waitq related stuff stays together.

File:

• kernel/generic/src/synch/waitq.c (modified) (1 diff)

kernel/generic/src/synch/waitq.c

@@ -117 +117 @@
 }
 
+/** Interrupt sleeping thread.
+ *
+ * This routine attempts to interrupt a thread from its sleep in a waitqueue.
+ * If the thread is not found sleeping, no action is taken.
+ *
+ * @param t Thread to be interrupted.
+ */
+void waitq_interrupt_sleep(thread_t *t)
+{
+        waitq_t *wq;
+        bool do_wakeup = false;
+        ipl_t ipl;
+
+        ipl = interrupts_disable();
+        spinlock_lock(&threads_lock);
+        if (!thread_exists(t))
+                goto out;
+
+grab_locks:
+        spinlock_lock(&t->lock);
+        if ((wq = t->sleep_queue)) {            /* assignment */
+                if (!(t->sleep_interruptible)) {
+                        /*
+                         * The sleep cannot be interrupted.
+                         */
+                        spinlock_unlock(&t->lock);
+                        goto out;
+                }
+                        
+                if (!spinlock_trylock(&wq->lock)) {
+                        spinlock_unlock(&t->lock);
+                        goto grab_locks;        /* avoid deadlock */
+                }
+
+                if (t->timeout_pending && timeout_unregister(&t->sleep_timeout))
+                        t->timeout_pending = false;
+
+                list_remove(&t->wq_link);
+                t->saved_context = t->sleep_interruption_context;
+                do_wakeup = true;
+                t->sleep_queue = NULL;
+                spinlock_unlock(&wq->lock);
+        }
+        spinlock_unlock(&t->lock);
+
+        if (do_wakeup)
+                thread_ready(t);
+
+out:
+        spinlock_unlock(&threads_lock);
+        interrupts_restore(ipl);
+}
 
 /** Sleep until either wakeup, timeout or interruption occurs