diff options
Diffstat (limited to 'include/linux/wait_bit.h')
| -rw-r--r-- | include/linux/wait_bit.h | 95 |
1 files changed, 69 insertions, 26 deletions
diff --git a/include/linux/wait_bit.h b/include/linux/wait_bit.h index 61b39eaf7cad..9318b2166439 100644 --- a/include/linux/wait_bit.h +++ b/include/linux/wait_bit.h @@ -10,7 +10,6 @@ struct wait_bit_key { void *flags; int bit_nr; -#define WAIT_ATOMIC_T_BIT_NR -1 unsigned long timeout; }; @@ -22,21 +21,15 @@ struct wait_bit_queue_entry { #define __WAIT_BIT_KEY_INITIALIZER(word, bit) \ { .flags = word, .bit_nr = bit, } -#define __WAIT_ATOMIC_T_KEY_INITIALIZER(p) \ - { .flags = p, .bit_nr = WAIT_ATOMIC_T_BIT_NR, } - typedef int wait_bit_action_f(struct wait_bit_key *key, int mode); -typedef int wait_atomic_t_action_f(atomic_t *counter, unsigned int mode); void __wake_up_bit(struct wait_queue_head *wq_head, void *word, int bit); int __wait_on_bit(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry, wait_bit_action_f *action, unsigned int mode); int __wait_on_bit_lock(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry, wait_bit_action_f *action, unsigned int mode); void wake_up_bit(void *word, int bit); -void wake_up_atomic_t(atomic_t *p); int out_of_line_wait_on_bit(void *word, int, wait_bit_action_f *action, unsigned int mode); int out_of_line_wait_on_bit_timeout(void *word, int, wait_bit_action_f *action, unsigned int mode, unsigned long timeout); int out_of_line_wait_on_bit_lock(void *word, int, wait_bit_action_f *action, unsigned int mode); -int out_of_line_wait_on_atomic_t(atomic_t *p, wait_atomic_t_action_f action, unsigned int mode); struct wait_queue_head *bit_waitqueue(void *word, int bit); extern void __init wait_bit_init(void); @@ -57,7 +50,6 @@ extern int bit_wait(struct wait_bit_key *key, int mode); extern int bit_wait_io(struct wait_bit_key *key, int mode); extern int bit_wait_timeout(struct wait_bit_key *key, int mode); extern int bit_wait_io_timeout(struct wait_bit_key *key, int mode); -extern int atomic_t_wait(atomic_t *counter, unsigned int mode); /** * wait_on_bit - wait for a bit to be cleared @@ -243,23 +235,74 @@ wait_on_bit_lock_action(unsigned long *word, int bit, wait_bit_action_f *action, return out_of_line_wait_on_bit_lock(word, bit, action, mode); } -/** - * wait_on_atomic_t - Wait for an atomic_t to become 0 - * @val: The atomic value being waited on, a kernel virtual address - * @action: the function used to sleep, which may take special actions - * @mode: the task state to sleep in - * - * Wait for an atomic_t to become 0. We abuse the bit-wait waitqueue table for - * the purpose of getting a waitqueue, but we set the key to a bit number - * outside of the target 'word'. - */ -static inline -int wait_on_atomic_t(atomic_t *val, wait_atomic_t_action_f action, unsigned mode) -{ - might_sleep(); - if (atomic_read(val) == 0) - return 0; - return out_of_line_wait_on_atomic_t(val, action, mode); -} +extern void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry, void *var, int flags); +extern void wake_up_var(void *var); +extern wait_queue_head_t *__var_waitqueue(void *p); + +#define ___wait_var_event(var, condition, state, exclusive, ret, cmd) \ +({ \ + __label__ __out; \ + struct wait_queue_head *__wq_head = __var_waitqueue(var); \ + struct wait_bit_queue_entry __wbq_entry; \ + long __ret = ret; /* explicit shadow */ \ + \ + init_wait_var_entry(&__wbq_entry, var, \ + exclusive ? WQ_FLAG_EXCLUSIVE : 0); \ + for (;;) { \ + long __int = prepare_to_wait_event(__wq_head, \ + &__wbq_entry.wq_entry, \ + state); \ + if (condition) \ + break; \ + \ + if (___wait_is_interruptible(state) && __int) { \ + __ret = __int; \ + goto __out; \ + } \ + \ + cmd; \ + } \ + finish_wait(__wq_head, &__wbq_entry.wq_entry); \ +__out: __ret; \ +}) + +#define __wait_var_event(var, condition) \ + ___wait_var_event(var, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ + schedule()) + +#define wait_var_event(var, condition) \ +do { \ + might_sleep(); \ + if (condition) \ + break; \ + __wait_var_event(var, condition); \ +} while (0) + +#define __wait_var_event_killable(var, condition) \ + ___wait_var_event(var, condition, TASK_KILLABLE, 0, 0, \ + schedule()) + +#define wait_var_event_killable(var, condition) \ +({ \ + int __ret = 0; \ + might_sleep(); \ + if (!(condition)) \ + __ret = __wait_var_event_killable(var, condition); \ + __ret; \ +}) + +#define __wait_var_event_timeout(var, condition, timeout) \ + ___wait_var_event(var, ___wait_cond_timeout(condition), \ + TASK_UNINTERRUPTIBLE, 0, timeout, \ + __ret = schedule_timeout(__ret)) + +#define wait_var_event_timeout(var, condition, timeout) \ +({ \ + long __ret = timeout; \ + might_sleep(); \ + if (!___wait_cond_timeout(condition)) \ + __ret = __wait_var_event_timeout(var, condition, timeout); \ + __ret; \ +}) #endif /* _LINUX_WAIT_BIT_H */ |