Linux-2.6.12-rc2v2.6.12-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