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Message-ID: <48AB73A3.9010404@hypersurf.com>
Date: Tue, 19 Aug 2008 18:30:11 -0700
From: Kevin Diggs <kevdig@...ersurf.com>
To: linux-kernel@...r.kernel.org
CC: david@...morbit.com, stefanr@...6.in-berlin.de, arnd@...db.de
Subject: {NOT a PATCH} Corrections please ...
Hi,
It was recommended that I use a completion in a driver I am working on.
While figuring out how to use one, I noticed that there was no kernel
doc block comments. I am trying to add them. I would rather not have to
respin the patch for corrections.
--- include/linux/completion.h.orig 2008-08-13 00:56:52.000000000 -0700
+++ include/linux/completion.h 2008-08-19 17:47:49.000000000 -0700
@@ -10,6 +10,14 @@
#include <linux/wait.h>
+/**
+ * struct completion - structure used to maintain state for a "completion"
+ *
+ * This is the opaque structure used to maintain the state for a
"completion".
+ * See also: complete(), wait_for_completion() (and friends _timeout,
+ * _interruptible, _interruptible_timeout, and _killable),
init_completion(),
+ * and macros DECLARE_COMPLETION() and INIT_COMPLETION().
+ */
struct completion {
unsigned int done;
wait_queue_head_t wait;
@@ -21,6 +29,14 @@
#define COMPLETION_INITIALIZER_ONSTACK(work) \
({ init_completion(&work); work; })
+/**
+ * DECLARE_COMPLETION: - declare and initialize a completion structure
+ * @work: identifier for the completion structure
+ *
+ * This macro declares and initializes a completion structure.
Generally used
+ * for static declarations. You should use the _ONSTACK variant for
automatic
+ * variables.
+ */
#define DECLARE_COMPLETION(work) \
struct completion work = COMPLETION_INITIALIZER(work)
@@ -29,6 +45,13 @@
* completions - so we use the _ONSTACK() variant for those that
* are on the kernel stack:
*/
+/**
+ * DECLARE_COMPLETION_ONSTACK: - declare and initialize a completion
structure
+ * @work: identifier for the completion structure
+ *
+ * This macro declares and initializes a completion structure on the kernel
+ * stack.
+ */
#ifdef CONFIG_LOCKDEP
# define DECLARE_COMPLETION_ONSTACK(work) \
struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
@@ -36,6 +59,13 @@
# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
#endif
+/**
+ * init_completion: - Initialize a dynamically allocated completion
+ * @x: completion structure that is to be initialized
+ *
+ * This inline function will initialize a dynamically created completion
+ * structure.
+ */
static inline void init_completion(struct completion *x)
{
x->done = 0;
@@ -53,6 +83,13 @@
extern void complete(struct completion *);
extern void complete_all(struct completion *);
+/**
+ * INIT_COMPLETION: - reinitialize a completion structure
+ * @x: completion structure to be reinitialized
+ *
+ * This macro should be used to reinitialize a completion structure so
it can
+ * be reused. This is especially important after complete_all() is used.
+ */
#define INIT_COMPLETION(x) ((x).done = 0)
#endif
--- kernel/sched.c.orig 2008-08-13 02:22:42.000000000 -0700
+++ kernel/sched.c 2008-08-19 17:12:36.000000000 -0700
@@ -4363,6 +4363,15 @@
}
EXPORT_SYMBOL_GPL(__wake_up_sync); /* For internal use only */
+/**
+ * complete: - signals a single thread waiting on this completion
+ * @x: holds the state of this particular completion
+ *
+ * This will wake up a single thread waiting on this completion.
Threads will be
+ * awakened in the same order in which they were queued.
+ *
+ * See also complete_all().
+ */
void complete(struct completion *x)
{
unsigned long flags;
@@ -4374,6 +4383,12 @@
}
EXPORT_SYMBOL(complete);
+/**
+ * complete_all: - signals all threads waiting on this completion
+ * @x: holds the state of this particular completion
+ *
+ * This will wake up all threads waiting on this particular completion
event.
+ */
void complete_all(struct completion *x)
{
unsigned long flags;
@@ -4425,12 +4440,30 @@
return timeout;
}
+/**
+ * wait_for_completion: - waits for completion of a task
+ * @x: holds the state of this particular completion
+ *
+ * This waits to be signaled for completion of a specific task. It is NOT
+ * interruptible and there is no timeout. If it is necessary for the
thread to
+ * wait it will be added to the tail of the wait queue.
+ */
void __sched wait_for_completion(struct completion *x)
{
wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(wait_for_completion);
+/**
+ * wait_for_completion_timeout: - waits for completion of a task
(w/timeout)
+ * @x: holds the state of this particular completion
+ * @timeout: timeout value in jiffies
+ *
+ * This waits for either a completion of a specific task to be signaled
or for a
+ * specified timeout to expire. The timeout is in jiffies. It is not
+ * interruptible. If it is necessary for the thread to wait it will be
+ * added to the tail of the wait queue.
+ */
unsigned long __sched
wait_for_completion_timeout(struct completion *x, unsigned long timeout)
{
@@ -4438,6 +4471,14 @@
}
EXPORT_SYMBOL(wait_for_completion_timeout);
+/**
+ * wait_for_completion_interruptible: - waits for completion of a task
(w/intr)
+ * @x: holds the state of this particular completion
+ *
+ * This waits for completion of a specific task to be signaled. It is
+ * interruptible. If it is necessary for the thread to wait it will be
+ * added to the tail of the wait queue.
+ */
int __sched wait_for_completion_interruptible(struct completion *x)
{
long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_INTERRUPTIBLE);
@@ -4447,6 +4488,16 @@
}
EXPORT_SYMBOL(wait_for_completion_interruptible);
+/**
+ * wait_for_completion_interruptible_timeout: - waits for completion
(w/(to,intr))
+ * @x: holds the state of this particular completion
+ * @timeout: timeout value in jiffies
+ *
+ * This waits for either a completion of a specific task to be signaled
or for a
+ * specified timeout to expire. It is interruptible. The timeout is in
jiffies.
+ * If it is necessary for the thread to wait it will be added to the
tail of
+ * the wait queue.
+ */
unsigned long __sched
wait_for_completion_interruptible_timeout(struct completion *x,
unsigned long timeout)
@@ -4455,6 +4506,14 @@
}
EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
+/**
+ * wait_for_completion_killable: - waits for completion of a task
(killable)
+ * @x: holds the state of this particular completion
+ *
+ * This waits to be signaled for completion of a specific task. It can be
+ * interrupted by a kill signal. If it is necessary for the thread to
+ * wait it will be added to the tail of the wait queue.
+ */
int __sched wait_for_completion_killable(struct completion *x)
{
long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_KILLABLE);
--
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