Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 460 insertions, 0 deletions

diff --git a/include/linux/wait.h b/include/linux/wait.h
new file mode 100644
index 000000000000..17c874a8eb3f
--- /dev/null
+++ b/include/linux/wait.h
@@ -0,0 +1,460 @@
+#ifndef _LINUX_WAIT_H
+#define _LINUX_WAIT_H
+
+#define WNOHANG		0x00000001
+#define WUNTRACED	0x00000002
+#define WSTOPPED	WUNTRACED
+#define WEXITED		0x00000004
+#define WCONTINUED	0x00000008
+#define WNOWAIT		0x01000000	/* Don't reap, just poll status.  */
+
+#define __WNOTHREAD	0x20000000	/* Don't wait on children of other threads in this group */
+#define __WALL		0x40000000	/* Wait on all children, regardless of type */
+#define __WCLONE	0x80000000	/* Wait only on non-SIGCHLD children */
+
+/* First argument to waitid: */
+#define P_ALL		0
+#define P_PID		1
+#define P_PGID		2
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/list.h>
+#include <linux/stddef.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <asm/current.h>
+
+typedef struct __wait_queue wait_queue_t;
+typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int sync, void *key);
+int default_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
+
+struct __wait_queue {
+	unsigned int flags;
+#define WQ_FLAG_EXCLUSIVE	0x01
+	struct task_struct * task;
+	wait_queue_func_t func;
+	struct list_head task_list;
+};
+
+struct wait_bit_key {
+	void *flags;
+	int bit_nr;
+};
+
+struct wait_bit_queue {
+	struct wait_bit_key key;
+	wait_queue_t wait;
+};
+
+struct __wait_queue_head {
+	spinlock_t lock;
+	struct list_head task_list;
+};
+typedef struct __wait_queue_head wait_queue_head_t;
+
+
+/*
+ * Macros for declaration and initialisaton of the datatypes
+ */
+
+#define __WAITQUEUE_INITIALIZER(name, tsk) {				\
+	.task		= tsk,						\
+	.func		= default_wake_function,			\
+	.task_list	= { NULL, NULL } }
+
+#define DECLARE_WAITQUEUE(name, tsk)					\
+	wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)
+
+#define __WAIT_QUEUE_HEAD_INITIALIZER(name) {				\
+	.lock		= SPIN_LOCK_UNLOCKED,				\
+	.task_list	= { &(name).task_list, &(name).task_list } }
+
+#define DECLARE_WAIT_QUEUE_HEAD(name) \
+	wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
+
+#define __WAIT_BIT_KEY_INITIALIZER(word, bit)				\
+	{ .flags = word, .bit_nr = bit, }
+
+static inline void init_waitqueue_head(wait_queue_head_t *q)
+{
+	spin_lock_init(&q->lock);
+	INIT_LIST_HEAD(&q->task_list);
+}
+
+static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
+{
+	q->flags = 0;
+	q->task = p;
+	q->func = default_wake_function;
+}
+
+static inline void init_waitqueue_func_entry(wait_queue_t *q,
+					wait_queue_func_t func)
+{
+	q->flags = 0;
+	q->task = NULL;
+	q->func = func;
+}
+
+static inline int waitqueue_active(wait_queue_head_t *q)
+{
+	return !list_empty(&q->task_list);
+}
+
+/*
+ * Used to distinguish between sync and async io wait context:
+ * sync i/o typically specifies a NULL wait queue entry or a wait
+ * queue entry bound to a task (current task) to wake up.
+ * aio specifies a wait queue entry with an async notification
+ * callback routine, not associated with any task.
+ */
+#define is_sync_wait(wait)	(!(wait) || ((wait)->task))
+
+extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
+extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
+extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
+
+static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
+{
+	list_add(&new->task_list, &head->task_list);
+}
+
+/*
+ * Used for wake-one threads:
+ */
+static inline void __add_wait_queue_tail(wait_queue_head_t *head,
+						wait_queue_t *new)
+{
+	list_add_tail(&new->task_list, &head->task_list);
+}
+
+static inline void __remove_wait_queue(wait_queue_head_t *head,
+							wait_queue_t *old)
+{
+	list_del(&old->task_list);
+}
+
+void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key));
+extern void FASTCALL(__wake_up_locked(wait_queue_head_t *q, unsigned int mode));
+extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr));
+void FASTCALL(__wake_up_bit(wait_queue_head_t *, void *, int));
+int FASTCALL(__wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned));
+int FASTCALL(__wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned));
+void FASTCALL(wake_up_bit(void *, int));
+int FASTCALL(out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned));
+int FASTCALL(out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned));
+wait_queue_head_t *FASTCALL(bit_waitqueue(void *, int));
+
+#define wake_up(x)			__wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1, NULL)
+#define wake_up_nr(x, nr)		__wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr, NULL)
+#define wake_up_all(x)			__wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0, NULL)
+#define wake_up_interruptible(x)	__wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
+#define wake_up_interruptible_nr(x, nr)	__wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
+#define wake_up_interruptible_all(x)	__wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
+#define	wake_up_locked(x)		__wake_up_locked((x), TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE)
+#define wake_up_interruptible_sync(x)   __wake_up_sync((x),TASK_INTERRUPTIBLE, 1)
+
+#define __wait_event(wq, condition) 					\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		schedule();						\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+/**
+ * wait_event - sleep until a condition gets true
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ *
+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
+ * @condition evaluates to true. The @condition is checked each time
+ * the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ */
+#define wait_event(wq, condition) 					\
+do {									\
+	if (condition)	 						\
+		break;							\
+	__wait_event(wq, condition);					\
+} while (0)
+
+#define __wait_event_timeout(wq, condition, ret)			\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		ret = schedule_timeout(ret);				\
+		if (!ret)						\
+			break;						\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+/**
+ * wait_event_timeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
+ * @condition evaluates to true. The @condition is checked each time
+ * the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function returns 0 if the @timeout elapsed, and the remaining
+ * jiffies if the condition evaluated to true before the timeout elapsed.
+ */
+#define wait_event_timeout(wq, condition, timeout)			\
+({									\
+	long __ret = timeout;						\
+	if (!(condition)) 						\
+		__wait_event_timeout(wq, condition, __ret);		\
+	__ret;								\
+})
+
+#define __wait_event_interruptible(wq, condition, ret)			\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		if (!signal_pending(current)) {				\
+			schedule();					\
+			continue;					\
+		}							\
+		ret = -ERESTARTSYS;					\
+		break;							\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+/**
+ * wait_event_interruptible - sleep until a condition gets true
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ *
+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * The @condition is checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function will return -ERESTARTSYS if it was interrupted by a
+ * signal and 0 if @condition evaluated to true.
+ */
+#define wait_event_interruptible(wq, condition)				\
+({									\
+	int __ret = 0;							\
+	if (!(condition))						\
+		__wait_event_interruptible(wq, condition, __ret);	\
+	__ret;								\
+})
+
+#define __wait_event_interruptible_timeout(wq, condition, ret)		\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		if (!signal_pending(current)) {				\
+			ret = schedule_timeout(ret);			\
+			if (!ret)					\
+				break;					\
+			continue;					\
+		}							\
+		ret = -ERESTARTSYS;					\
+		break;							\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+/**
+ * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * The @condition is checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
+ * was interrupted by a signal, and the remaining jiffies otherwise
+ * if the condition evaluated to true before the timeout elapsed.
+ */
+#define wait_event_interruptible_timeout(wq, condition, timeout)	\
+({									\
+	long __ret = timeout;						\
+	if (!(condition))						\
+		__wait_event_interruptible_timeout(wq, condition, __ret); \
+	__ret;								\
+})
+
+#define __wait_event_interruptible_exclusive(wq, condition, ret)	\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait_exclusive(&wq, &__wait,			\
+					TASK_INTERRUPTIBLE);		\
+		if (condition)						\
+			break;						\
+		if (!signal_pending(current)) {				\
+			schedule();					\
+			continue;					\
+		}							\
+		ret = -ERESTARTSYS;					\
+		break;							\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+#define wait_event_interruptible_exclusive(wq, condition)		\
+({									\
+	int __ret = 0;							\
+	if (!(condition))						\
+		__wait_event_interruptible_exclusive(wq, condition, __ret);\
+	__ret;								\
+})
+
+/*
+ * Must be called with the spinlock in the wait_queue_head_t held.
+ */
+static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q,
+						   wait_queue_t * wait)
+{
+	wait->flags |= WQ_FLAG_EXCLUSIVE;
+	__add_wait_queue_tail(q,  wait);
+}
+
+/*
+ * Must be called with the spinlock in the wait_queue_head_t held.
+ */
+static inline void remove_wait_queue_locked(wait_queue_head_t *q,
+					    wait_queue_t * wait)
+{
+	__remove_wait_queue(q,  wait);
+}
+
+/*
+ * These are the old interfaces to sleep waiting for an event.
+ * They are racy.  DO NOT use them, use the wait_event* interfaces above.  
+ * We plan to remove these interfaces during 2.7.
+ */
+extern void FASTCALL(sleep_on(wait_queue_head_t *q));
+extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
+				      signed long timeout));
+extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q));
+extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q,
+						    signed long timeout));
+
+/*
+ * Waitqueues which are removed from the waitqueue_head at wakeup time
+ */
+void FASTCALL(prepare_to_wait(wait_queue_head_t *q,
+				wait_queue_t *wait, int state));
+void FASTCALL(prepare_to_wait_exclusive(wait_queue_head_t *q,
+				wait_queue_t *wait, int state));
+void FASTCALL(finish_wait(wait_queue_head_t *q, wait_queue_t *wait));
+int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
+int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
+
+#define DEFINE_WAIT(name)						\
+	wait_queue_t name = {						\
+		.task		= current,				\
+		.func		= autoremove_wake_function,		\
+		.task_list	= {	.next = &(name).task_list,	\
+					.prev = &(name).task_list,	\
+				},					\
+	}
+
+#define DEFINE_WAIT_BIT(name, word, bit)				\
+	struct wait_bit_queue name = {					\
+		.key = __WAIT_BIT_KEY_INITIALIZER(word, bit),		\
+		.wait	= {						\
+			.task		= current,			\
+			.func		= wake_bit_function,		\
+			.task_list	=				\
+				LIST_HEAD_INIT((name).wait.task_list),	\
+		},							\
+	}
+
+#define init_wait(wait)							\
+	do {								\
+		(wait)->task = current;					\
+		(wait)->func = autoremove_wake_function;		\
+		INIT_LIST_HEAD(&(wait)->task_list);			\
+	} while (0)
+
+/**
+ * wait_on_bit - wait for a bit to be cleared
+ * @word: the word being waited on, a kernel virtual address
+ * @bit: the bit of the word being waited on
+ * @action: the function used to sleep, which may take special actions
+ * @mode: the task state to sleep in
+ *
+ * There is a standard hashed waitqueue table for generic use. This
+ * is the part of the hashtable's accessor API that waits on a bit.
+ * For instance, if one were to have waiters on a bitflag, one would
+ * call wait_on_bit() in threads waiting for the bit to clear.
+ * One uses wait_on_bit() where one is waiting for the bit to clear,
+ * but has no intention of setting it.
+ */
+static inline int wait_on_bit(void *word, int bit,
+				int (*action)(void *), unsigned mode)
+{
+	if (!test_bit(bit, word))
+		return 0;
+	return out_of_line_wait_on_bit(word, bit, action, mode);
+}
+
+/**
+ * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
+ * @word: the word being waited on, a kernel virtual address
+ * @bit: the bit of the word being waited on
+ * @action: the function used to sleep, which may take special actions
+ * @mode: the task state to sleep in
+ *
+ * There is a standard hashed waitqueue table for generic use. This
+ * is the part of the hashtable's accessor API that waits on a bit
+ * when one intends to set it, for instance, trying to lock bitflags.
+ * For instance, if one were to have waiters trying to set bitflag
+ * and waiting for it to clear before setting it, one would call
+ * wait_on_bit() in threads waiting to be able to set the bit.
+ * One uses wait_on_bit_lock() where one is waiting for the bit to
+ * clear with the intention of setting it, and when done, clearing it.
+ */
+static inline int wait_on_bit_lock(void *word, int bit,
+				int (*action)(void *), unsigned mode)
+{
+	if (!test_and_set_bit(bit, word))
+		return 0;
+	return out_of_line_wait_on_bit_lock(word, bit, action, mode);
+}
+	
+#endif /* __KERNEL__ */
+
+#endif