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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 847 | 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 | extern void init_waitqueue_head(wait_queue_head_t *q); |
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| 58 | |||
| 59 | extern void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p); |
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| 60 | |||
| 61 | extern void init_waitqueue_func_entry(wait_queue_t *q, |
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| 62 | wait_queue_func_t func); |
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| 63 | |||
| 64 | extern int waitqueue_active(wait_queue_head_t *q); |
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| 65 | |||
| 66 | extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 67 | extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 68 | extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); |
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| 69 | |||
| 70 | extern void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new); |
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| 71 | |||
| 72 | /* |
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| 73 | * Used for wake-one threads: |
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| 74 | */ |
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| 75 | static inline void __add_wait_queue_tail(wait_queue_head_t *head, |
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| 76 | wait_queue_t *new) |
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| 77 | { |
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| 78 | list_add_tail(&new->task_list, &head->task_list); |
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| 79 | } |
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| 80 | |||
| 81 | |||
| 82 | extern void free(void *ptr); |
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| 83 | static inline void __remove_wait_queue(wait_queue_head_t *head, |
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| 84 | wait_queue_t *old) |
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| 85 | { |
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| 86 | free(old->task); //** SHARK |
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| 87 | list_del(&old->task_list); |
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| 88 | } |
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| 89 | |||
| 90 | extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr)); |
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| 91 | extern void FASTCALL(__wake_up_locked(wait_queue_head_t *q, unsigned int mode)); |
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| 92 | extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr)); |
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| 93 | |||
| 94 | #define wake_up(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1) |
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| 95 | #define wake_up_nr(x, nr) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr) |
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| 96 | #define wake_up_all(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0) |
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| 97 | #define wake_up_all_sync(x) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0) |
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| 98 | #define wake_up_interruptible(x) __wake_up((x),TASK_INTERRUPTIBLE, 1) |
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| 99 | #define wake_up_interruptible_nr(x, nr) __wake_up((x),TASK_INTERRUPTIBLE, nr) |
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| 100 | #define wake_up_interruptible_all(x) __wake_up((x),TASK_INTERRUPTIBLE, 0) |
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| 101 | #define wake_up_locked(x) __wake_up_locked((x), TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE) |
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| 102 | #define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1) |
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| 103 | |||
| 104 | #define __wait_event(wq, condition) \ |
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| 105 | do { \ |
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| 106 | wait_queue_t __wait; \ |
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| 107 | init_waitqueue_entry(&__wait, current); \ |
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| 108 | \ |
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| 109 | add_wait_queue(&wq, &__wait); \ |
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| 110 | for (;;) { \ |
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| 111 | set_current_state(TASK_UNINTERRUPTIBLE); \ |
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| 112 | if (condition) \ |
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| 113 | break; \ |
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| 114 | schedule(); \ |
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| 115 | } \ |
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| 116 | current->state = TASK_RUNNING; \ |
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| 117 | remove_wait_queue(&wq, &__wait); \ |
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| 118 | } while (0) |
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| 119 | |||
| 120 | #define wait_event(wq, condition) \ |
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| 121 | do { \ |
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| 122 | if (condition) \ |
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| 123 | break; \ |
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| 124 | __wait_event(wq, condition); \ |
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| 125 | } while (0) |
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| 126 | |||
| 127 | #define __wait_event_interruptible(wq, condition, ret) \ |
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| 128 | do { \ |
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| 129 | wait_queue_t __wait; \ |
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| 130 | init_waitqueue_entry(&__wait, current); \ |
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| 131 | \ |
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| 132 | add_wait_queue(&wq, &__wait); \ |
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| 133 | for (;;) { \ |
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| 134 | set_current_state(TASK_INTERRUPTIBLE); \ |
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| 135 | if (condition) \ |
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| 136 | break; \ |
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| 137 | if (!signal_pending(current)) { \ |
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| 138 | schedule(); \ |
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| 139 | continue; \ |
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| 140 | } \ |
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| 141 | ret = -ERESTARTSYS; \ |
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| 142 | break; \ |
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| 143 | } \ |
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| 144 | current->state = TASK_RUNNING; \ |
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| 145 | remove_wait_queue(&wq, &__wait); \ |
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| 146 | } while (0) |
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| 147 | |||
| 148 | #define wait_event_interruptible(wq, condition) \ |
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| 149 | ({ \ |
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| 150 | int __ret = 0; \ |
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| 151 | if (!(condition)) \ |
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| 152 | __wait_event_interruptible(wq, condition, __ret); \ |
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| 153 | __ret; \ |
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| 154 | }) |
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| 155 | |||
| 156 | #define __wait_event_interruptible_timeout(wq, condition, ret) \ |
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| 157 | do { \ |
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| 158 | wait_queue_t __wait; \ |
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| 159 | init_waitqueue_entry(&__wait, current); \ |
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| 160 | \ |
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| 161 | add_wait_queue(&wq, &__wait); \ |
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| 162 | for (;;) { \ |
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| 163 | set_current_state(TASK_INTERRUPTIBLE); \ |
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| 164 | if (condition) \ |
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| 165 | break; \ |
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| 166 | if (!signal_pending(current)) { \ |
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| 167 | ret = schedule_timeout(ret); \ |
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| 168 | if (!ret) \ |
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| 169 | break; \ |
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| 170 | continue; \ |
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| 171 | } \ |
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| 172 | ret = -ERESTARTSYS; \ |
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| 173 | break; \ |
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| 174 | } \ |
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| 175 | current->state = TASK_RUNNING; \ |
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| 176 | remove_wait_queue(&wq, &__wait); \ |
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| 177 | } while (0) |
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| 178 | |||
| 179 | #define wait_event_interruptible_timeout(wq, condition, timeout) \ |
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| 180 | ({ \ |
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| 181 | long __ret = timeout; \ |
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| 182 | if (!(condition)) \ |
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| 183 | __wait_event_interruptible_timeout(wq, condition, __ret); \ |
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| 184 | __ret; \ |
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| 185 | }) |
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| 186 | |||
| 187 | /* |
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| 188 | * Must be called with the spinlock in the wait_queue_head_t held. |
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| 189 | */ |
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| 190 | static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q, |
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| 191 | wait_queue_t * wait) |
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| 192 | { |
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| 193 | wait->flags |= WQ_FLAG_EXCLUSIVE; |
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| 194 | __add_wait_queue_tail(q, wait); |
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| 195 | } |
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| 196 | |||
| 197 | /* |
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| 198 | * Must be called with the spinlock in the wait_queue_head_t held. |
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| 199 | */ |
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| 200 | static inline void remove_wait_queue_locked(wait_queue_head_t *q, |
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| 201 | wait_queue_t * wait) |
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| 202 | { |
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| 203 | __remove_wait_queue(q, wait); |
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| 204 | } |
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| 205 | |||
| 206 | /* |
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| 207 | * These are the old interfaces to sleep waiting for an event. |
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| 208 | * They are racy. DO NOT use them, use the wait_event* interfaces above. |
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| 209 | * We plan to remove these interfaces during 2.7. |
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| 210 | */ |
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| 211 | extern void FASTCALL(sleep_on(wait_queue_head_t *q)); |
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| 212 | extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q, |
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| 213 | signed long timeout)); |
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| 214 | extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q)); |
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| 215 | extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q, |
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| 216 | signed long timeout)); |
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| 217 | |||
| 218 | /* |
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| 219 | * Waitqueues which are removed from the waitqueue_head at wakeup time |
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| 220 | */ |
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| 221 | void FASTCALL(prepare_to_wait(wait_queue_head_t *q, |
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| 222 | wait_queue_t *wait, int state)); |
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| 223 | void FASTCALL(prepare_to_wait_exclusive(wait_queue_head_t *q, |
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| 224 | wait_queue_t *wait, int state)); |
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| 225 | void FASTCALL(finish_wait(wait_queue_head_t *q, wait_queue_t *wait)); |
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| 226 | int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync); |
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| 227 | |||
| 228 | #define DEFINE_WAIT(name) \ |
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| 229 | wait_queue_t name = { \ |
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| 230 | .task = current, \ |
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| 231 | .func = autoremove_wake_function, \ |
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| 232 | .task_list = { .next = &name.task_list, \ |
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| 233 | .prev = &name.task_list, \ |
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| 234 | }, \ |
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| 235 | } |
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| 236 | |||
| 237 | #define init_wait(wait) \ |
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| 238 | do { \ |
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| 239 | wait->task = current; \ |
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| 240 | wait->func = autoremove_wake_function; \ |
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| 241 | INIT_LIST_HEAD(&wait->task_list); \ |
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| 242 | } while (0) |
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| 243 | |||
| 244 | #endif /* __KERNEL__ */ |
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| 245 | |||
| 246 | #endif |