patch-2.3.43 linux/arch/ppc/kernel/semaphore.c

• Lines: 45
• Date: Wed Feb 9 19:43:47 2000
• Orig file: v2.3.42/linux/arch/ppc/kernel/semaphore.c
• Orig date: Tue Aug 31 17:29:13 1999

diff -u --recursive --new-file v2.3.42/linux/arch/ppc/kernel/semaphore.c linux/arch/ppc/kernel/semaphore.c
@@ -137,3 +137,44 @@
 {
 	return waking_non_zero_trylock(sem);
 }
+
+
+/*
+ * rw semaphores    Ani Joshi <ajoshi@unixbox.com>
+ * based on alpha port by Andrea Arcangeli <andrea@suse.de>
+ */
+
+void down_read_failed(struct rw_semaphore *sem)
+{
+	struct task_struct *tsk = current;
+	DECLARE_WAITQUEUE(wait, tsk);
+
+	add_wait_queue_exclusive(&sem->wait, &wait);
+
+	do {
+		__set_task_state(tsk, TASK_UNINTERRUPTIBLE | TASK_EXCLUSIVE);
+		spin_unlock_irq(&sem->lock);
+		schedule();
+		spin_lock_irq(&sem->lock);
+	} while(sem->wr);
+
+	remove_wait_queue(&sem->wait, &wait);
+}
+
+void down_write_failed(struct rw_semaphore *sem)
+{
+	struct task_struct *tsk = current;
+	DECLARE_WAITQUEUE(wait, tsk);
+
+	add_wait_queue_exclusive(&sem->wait, &wait);
+
+	do {
+		__set_task_state(tsk, TASK_UNINTERRUPTIBLE | TASK_EXCLUSIVE);
+		spin_unlock_irq(&sem->lock);
+		schedule();
+		spin_lock_irq(&sem->lock);
+	} while(sem->rd || sem->wr);
+
+	remove_wait_queue(&sem->wait, &wait);
+}
+