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Date: Thu, 15 Feb 2007 17:52:04 +0100
From: Ingo Molnar <mingo@...e.hu>
To: linux-kernel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Arjan van de Ven <arjan@...radead.org>,
Christoph Hellwig <hch@...radead.org>,
Andrew Morton <akpm@....com.au>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Ulrich Drepper <drepper@...hat.com>,
Zach Brown <zach.brown@...cle.com>,
Evgeniy Polyakov <johnpol@....mipt.ru>,
"David S. Miller" <davem@...emloft.net>,
Suparna Bhattacharya <suparna@...ibm.com>,
Davide Libenzi <davidel@...ilserver.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [patch 01/14] syslets: add async.h include file, kernel-side API definitions
From: Ingo Molnar <mingo@...e.hu>
add include/linux/async.h which contains the kernel-side API
declarations.
it also provides NOP stubs for the !CONFIG_ASYNC_SUPPORT case.
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
include/linux/async.h | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
Index: linux/include/linux/async.h
===================================================================
--- /dev/null
+++ linux/include/linux/async.h
@@ -0,0 +1,96 @@
+#ifndef _LINUX_ASYNC_H
+#define _LINUX_ASYNC_H
+
+#include <linux/completion.h>
+#include <linux/compiler.h>
+
+/*
+ * The syslet subsystem - asynchronous syscall execution support.
+ *
+ * Generic kernel API definitions:
+ */
+
+struct syslet_uatom;
+struct async_thread;
+struct async_head;
+
+/*
+ * 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;
+
+ long events_left;
+ wait_queue_head_t wait;
+
+ struct async_head_user __user *ahu;
+ 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;
+
+ unsigned long __user *new_stack;
+ unsigned long new_eip;
+ 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;
+ unsigned long user_stack;
+ unsigned long user_eip;
+ struct async_head *ah;
+
+ struct list_head entry;
+
+ unsigned int exit;
+};
+
+#ifdef CONFIG_ASYNC_SUPPORT
+extern void async_init(struct task_struct *t);
+extern void async_exit(struct task_struct *t);
+extern void __async_schedule(struct task_struct *t);
+#else /* !CONFIG_ASYNC_SUPPORT */
+static inline void async_init(struct task_struct *t)
+{
+}
+static inline void async_exit(struct task_struct *t)
+{
+}
+static inline void __async_schedule(struct task_struct *t)
+{
+}
+#endif /* !CONFIG_ASYNC_SUPPORT */
+
+#endif
-
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