linux-kernel - [patch 04/11] syslets: core, data structures

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Date:	Tue, 13 Feb 2007 15:20:31 +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>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [patch 04/11] syslets: core, data structures

From: Ingo Molnar <mingo@...e.hu>

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 <mingo@...e.hu>
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 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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