From: Ingo Molnar <[email protected]>
this adds the data structures used by the syslet / async system calls
infrastructure.
This is used only if CONFIG_ASYNC_SUPPORT is enabled.
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>
---
kernel/async.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
Index: linux/kernel/async.h
===================================================================
--- /dev/null
+++ linux/kernel/async.h
@@ -0,0 +1,58 @@
+/*
+ * The syslet subsystem - asynchronous syscall execution support.
+ *
+ * Syslet-subsystem internal definitions:
+ */
+
+/*
+ * The kernel-side copy of a syslet atom - with arguments expanded:
+ */
+struct syslet_atom {
+ unsigned long flags;
+ unsigned long nr;
+ long __user *ret_ptr;
+ struct syslet_uatom __user *next;
+ unsigned long args[6];
+};
+
+/*
+ * The 'async head' is the thread which has user-space context (ptregs)
+ * 'below it' - this is the one that can return to user-space:
+ */
+struct async_head {
+ spinlock_t lock;
+ struct task_struct *user_task;
+
+ struct list_head ready_async_threads;
+ struct list_head busy_async_threads;
+
+ unsigned long events_left;
+ wait_queue_head_t wait;
+
+ struct async_head_user __user *uah;
+ struct syslet_uatom __user **completion_ring;
+ unsigned long curr_ring_idx;
+ unsigned long max_ring_idx;
+ unsigned long ring_size_bytes;
+
+ unsigned int nr_threads;
+ unsigned int max_nr_threads;
+
+ struct completion start_done;
+ struct completion exit_done;
+};
+
+/*
+ * The 'async thread' is either a newly created async thread or it is
+ * an 'ex-head' - it cannot return to user-space and only has kernel
+ * context.
+ */
+struct async_thread {
+ struct task_struct *task;
+ struct syslet_uatom __user *work;
+ struct async_head *ah;
+
+ struct list_head entry;
+
+ unsigned int exit;
+};
-
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