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| Rev | Author | Line No. | Line |
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| 422 | giacomo | 1 | #ifndef _LINUX_WAIT_H |
| 2 | #define _LINUX_WAIT_H |
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| 3 | |||
| 4 | #define WNOHANG 0x00000001 |
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| 5 | #define WUNTRACED 0x00000002 |
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| 6 | |||
| 7 | #define __WNOTHREAD 0x20000000 /* Don't wait on children of other threads in this group */ |
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| 8 | #define __WALL 0x40000000 /* Wait on all children, regardless of type */ |
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| 9 | #define __WCLONE 0x80000000 /* Wait only on non-SIGCHLD children */ |
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| 10 | |||
| 11 | #ifdef __KERNEL__ |
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| 12 | |||
| 13 | #include <linux/config.h> |
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| 14 | #include <linux/list.h> |
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| 15 | #include <linux/stddef.h> |
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| 16 | #include <linux/spinlock.h> |
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| 17 | #include <asm/system.h> |
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| 18 | |||
| 19 | typedef struct __wait_queue wait_queue_t; |
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| 20 | typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int sync); |
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| 21 | extern int default_wake_function(wait_queue_t *wait, unsigned mode, int sync); |
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| 22 | |||
| 23 | struct __wait_queue { |
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| 24 | unsigned int flags; |
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| 25 | #define WQ_FLAG_EXCLUSIVE 0x01 |
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| 26 | struct task_struct * task; |
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| 27 | wait_queue_func_t func; |
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| 28 | struct list_head task_list; |
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| 29 | }; |
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| 30 | |||
| 31 | struct __wait_queue_head { |
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| 32 | spinlock_t lock; |
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| 33 | struct list_head task_list; |
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| 34 | }; |
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| 35 | typedef struct __wait_queue_head wait_queue_head_t; |
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| 36 | |||
| 37 | |||
| 38 | /* |
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| 39 | * Macros for declaration and initialisaton of the datatypes |
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| 40 | */ |
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| 41 | |||
| 42 | #define __WAITQUEUE_INITIALIZER(name, tsk) { \ |
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| 43 | .task = tsk, \ |
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| 44 | .func = default_wake_function, \ |
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| 45 | .task_list = { NULL, NULL } } |
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| 46 | |||
| 47 | #define DECLARE_WAITQUEUE(name, tsk) \ |
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| 48 | wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk) |
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| 49 | |||
| 50 | #define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \ |
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| 51 | .lock = SPIN_LOCK_UNLOCKED, \ |
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| 52 | .task_list = { &(name).task_list, &(name).task_list } } |
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| 53 | |||
| 54 | #define DECLARE_WAIT_QUEUE_HEAD(name) \ |
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| 55 | wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name) |
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| 56 | |||
| 57 | static inline void init_waitqueue_head(wait_queue_head_t *q) |
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| 58 | { |
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| 59 | q->lock = SPIN_LOCK_UNLOCKED; |
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| 60 | INIT_LIST_HEAD(&q->task_list); |
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| 61 | } |
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| 62 | |||
| 63 | static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p) |
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| 64 | { |
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| 65 | q->flags = 0; |
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| 66 | q->task = p; |
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| 67 | q->func = default_wake_function; |
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| 68 | } |
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| 69 | |||
| 70 | static inline void init_waitqueue_func_entry(wait_queue_t *q, |
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| 71 | wait_queue_func_t func) |
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| 72 | { |
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| 73 | q->flags = 0; |
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| 74 | q->task = NULL; |
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| 75 | q->func = func; |
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| 76 | } |
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| 77 | |||
| 78 | static inline int waitqueue_active(wait_queue_head_t *q) |
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| 79 | { |
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| 80 | return !list_empty(&q->task_list); |
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| 81 | } |
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| 82 | |||
| 83 | extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 84 | extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 85 | extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 86 | |||
| 87 | static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new) |
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| 88 | { |
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| 89 | list_add(&new->task_list, &head->task_list); |
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| 90 | } |
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| 91 | |||
| 92 | /* |
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| 93 | * Used for wake-one threads: |
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| 94 | */ |
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| 95 | static inline void __add_wait_queue_tail(wait_queue_head_t *head, |
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| 96 | wait_queue_t *new) |
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| 97 | { |
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| 98 | list_add_tail(&new->task_list, &head->task_list); |
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| 99 | } |
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| 100 | |||
| 101 | static inline void __remove_wait_queue(wait_queue_head_t *head, |
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| 102 | wait_queue_t *old) |
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| 103 | { |
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| 104 | list_del(&old->task_list); |
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| 105 | } |
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| 106 | |||
| 107 | extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr)); |
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| 108 | extern void FASTCALL(__wake_up_locked(wait_queue_head_t *q, unsigned int mode)); |
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| 109 | extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr)); |
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| 110 | |||
| 111 | #define wake_up(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1) |
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| 112 | #define wake_up_nr(x, nr) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr) |
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| 113 | #define wake_up_all(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0) |
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| 114 | #define wake_up_all_sync(x) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0) |
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| 115 | #define wake_up_interruptible(x) __wake_up((x),TASK_INTERRUPTIBLE, 1) |
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| 116 | #define wake_up_interruptible_nr(x, nr) __wake_up((x),TASK_INTERRUPTIBLE, nr) |
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| 117 | #define wake_up_interruptible_all(x) __wake_up((x),TASK_INTERRUPTIBLE, 0) |
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| 118 | #define wake_up_locked(x) __wake_up_locked((x), TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE) |
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| 119 | #define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1) |
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| 120 | |||
| 121 | #define __wait_event(wq, condition) \ |
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| 122 | do { \ |
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| 123 | wait_queue_t __wait; \ |
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| 124 | init_waitqueue_entry(&__wait, current); \ |
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| 125 | \ |
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| 126 | add_wait_queue(&wq, &__wait); \ |
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| 127 | for (;;) { \ |
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| 128 | set_current_state(TASK_UNINTERRUPTIBLE); \ |
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| 129 | if (condition) \ |
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| 130 | break; \ |
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| 131 | schedule(); \ |
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| 132 | } \ |
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| 133 | current->state = TASK_RUNNING; \ |
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| 134 | remove_wait_queue(&wq, &__wait); \ |
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| 135 | } while (0) |
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| 136 | |||
| 137 | #define wait_event(wq, condition) \ |
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| 138 | do { \ |
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| 139 | if (condition) \ |
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| 140 | break; \ |
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| 141 | __wait_event(wq, condition); \ |
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| 142 | } while (0) |
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| 143 | |||
| 144 | #define __wait_event_interruptible(wq, condition, ret) \ |
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| 145 | do { \ |
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| 146 | wait_queue_t __wait; \ |
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| 147 | init_waitqueue_entry(&__wait, current); \ |
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| 148 | \ |
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| 149 | add_wait_queue(&wq, &__wait); \ |
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| 150 | for (;;) { \ |
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| 151 | set_current_state(TASK_INTERRUPTIBLE); \ |
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| 152 | if (condition) \ |
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| 153 | break; \ |
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| 154 | if (!signal_pending(current)) { \ |
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| 155 | schedule(); \ |
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| 156 | continue; \ |
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| 157 | } \ |
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| 158 | ret = -ERESTARTSYS; \ |
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| 159 | break; \ |
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| 160 | } \ |
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| 161 | current->state = TASK_RUNNING; \ |
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| 162 | remove_wait_queue(&wq, &__wait); \ |
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| 163 | } while (0) |
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| 164 | |||
| 165 | #define wait_event_interruptible(wq, condition) \ |
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| 166 | ({ \ |
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| 167 | int __ret = 0; \ |
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| 168 | if (!(condition)) \ |
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| 169 | __wait_event_interruptible(wq, condition, __ret); \ |
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| 170 | __ret; \ |
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| 171 | }) |
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| 172 | |||
| 173 | #define __wait_event_interruptible_timeout(wq, condition, ret) \ |
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| 174 | do { \ |
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| 175 | wait_queue_t __wait; \ |
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| 176 | init_waitqueue_entry(&__wait, current); \ |
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| 177 | \ |
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| 178 | add_wait_queue(&wq, &__wait); \ |
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| 179 | for (;;) { \ |
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| 180 | set_current_state(TASK_INTERRUPTIBLE); \ |
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| 181 | if (condition) \ |
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| 182 | break; \ |
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| 183 | if (!signal_pending(current)) { \ |
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| 184 | ret = schedule_timeout(ret); \ |
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| 185 | if (!ret) \ |
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| 186 | break; \ |
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| 187 | continue; \ |
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| 188 | } \ |
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| 189 | ret = -ERESTARTSYS; \ |
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| 190 | break; \ |
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| 191 | } \ |
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| 192 | current->state = TASK_RUNNING; \ |
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| 193 | remove_wait_queue(&wq, &__wait); \ |
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| 194 | } while (0) |
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| 195 | |||
| 196 | #define wait_event_interruptible_timeout(wq, condition, timeout) \ |
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| 197 | ({ \ |
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| 198 | long __ret = timeout; \ |
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| 199 | if (!(condition)) \ |
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| 200 | __wait_event_interruptible_timeout(wq, condition, __ret); \ |
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| 201 | __ret; \ |
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| 202 | }) |
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| 203 | |||
| 204 | /* |
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| 205 | * Must be called with the spinlock in the wait_queue_head_t held. |
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| 206 | */ |
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| 207 | static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q, |
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| 208 | wait_queue_t * wait) |
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| 209 | { |
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| 210 | wait->flags |= WQ_FLAG_EXCLUSIVE; |
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| 211 | __add_wait_queue_tail(q, wait); |
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| 212 | } |
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| 213 | |||
| 214 | /* |
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| 215 | * Must be called with the spinlock in the wait_queue_head_t held. |
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| 216 | */ |
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| 217 | static inline void remove_wait_queue_locked(wait_queue_head_t *q, |
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| 218 | wait_queue_t * wait) |
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| 219 | { |
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| 220 | __remove_wait_queue(q, wait); |
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| 221 | } |
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| 222 | |||
| 223 | /* |
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| 224 | * These are the old interfaces to sleep waiting for an event. |
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| 225 | * They are racy. DO NOT use them, use the wait_event* interfaces above. |
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| 226 | * We plan to remove these interfaces during 2.7. |
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| 227 | */ |
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| 228 | extern void FASTCALL(sleep_on(wait_queue_head_t *q)); |
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| 229 | extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q, |
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| 230 | signed long timeout)); |
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| 231 | extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q)); |
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| 232 | extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q, |
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| 233 | signed long timeout)); |
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| 234 | |||
| 235 | /* |
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| 236 | * Waitqueues which are removed from the waitqueue_head at wakeup time |
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| 237 | */ |
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| 238 | void FASTCALL(prepare_to_wait(wait_queue_head_t *q, |
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| 239 | wait_queue_t *wait, int state)); |
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| 240 | void FASTCALL(prepare_to_wait_exclusive(wait_queue_head_t *q, |
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| 241 | wait_queue_t *wait, int state)); |
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| 242 | void FASTCALL(finish_wait(wait_queue_head_t *q, wait_queue_t *wait)); |
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| 243 | int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync); |
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| 244 | |||
| 245 | #define DEFINE_WAIT(name) \ |
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| 246 | wait_queue_t name = { \ |
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| 247 | .task = current, \ |
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| 248 | .func = autoremove_wake_function, \ |
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| 249 | .task_list = { .next = &name.task_list, \ |
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| 250 | .prev = &name.task_list, \ |
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| 251 | }, \ |
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| 252 | } |
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| 253 | |||
| 254 | #define init_wait(wait) \ |
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| 255 | do { \ |
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| 256 | wait->task = current; \ |
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| 257 | wait->func = autoremove_wake_function; \ |
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| 258 | INIT_LIST_HEAD(&wait->task_list); \ |
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| 259 | } while (0) |
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| 260 | |||
| 261 | #endif /* __KERNEL__ */ |
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| 262 | |||
| 263 | #endif |