diff options
Diffstat (limited to 'include/linux/completion.h')
-rw-r--r-- | include/linux/completion.h | 46 |
1 files changed, 2 insertions, 44 deletions
diff --git a/include/linux/completion.h b/include/linux/completion.h index 57faa60de9bd..02ef8835999c 100644 --- a/include/linux/completion.h +++ b/include/linux/completion.h | |||
@@ -49,6 +49,8 @@ extern unsigned long wait_for_completion_timeout(struct completion *x, | |||
49 | unsigned long timeout); | 49 | unsigned long timeout); |
50 | extern unsigned long wait_for_completion_interruptible_timeout( | 50 | extern unsigned long wait_for_completion_interruptible_timeout( |
51 | struct completion *x, unsigned long timeout); | 51 | struct completion *x, unsigned long timeout); |
52 | extern bool try_wait_for_completion(struct completion *x); | ||
53 | extern bool completion_done(struct completion *x); | ||
52 | 54 | ||
53 | extern void complete(struct completion *); | 55 | extern void complete(struct completion *); |
54 | extern void complete_all(struct completion *); | 56 | extern void complete_all(struct completion *); |
@@ -56,48 +58,4 @@ extern void complete_all(struct completion *); | |||
56 | #define INIT_COMPLETION(x) ((x).done = 0) | 58 | #define INIT_COMPLETION(x) ((x).done = 0) |
57 | 59 | ||
58 | 60 | ||
59 | /** | ||
60 | * try_wait_for_completion - try to decrement a completion without blocking | ||
61 | * @x: completion structure | ||
62 | * | ||
63 | * Returns: 0 if a decrement cannot be done without blocking | ||
64 | * 1 if a decrement succeeded. | ||
65 | * | ||
66 | * If a completion is being used as a counting completion, | ||
67 | * attempt to decrement the counter without blocking. This | ||
68 | * enables us to avoid waiting if the resource the completion | ||
69 | * is protecting is not available. | ||
70 | */ | ||
71 | static inline bool try_wait_for_completion(struct completion *x) | ||
72 | { | ||
73 | int ret = 1; | ||
74 | |||
75 | spin_lock_irq(&x->wait.lock); | ||
76 | if (!x->done) | ||
77 | ret = 0; | ||
78 | else | ||
79 | x->done--; | ||
80 | spin_unlock_irq(&x->wait.lock); | ||
81 | return ret; | ||
82 | } | ||
83 | |||
84 | /** | ||
85 | * completion_done - Test to see if a completion has any waiters | ||
86 | * @x: completion structure | ||
87 | * | ||
88 | * Returns: 0 if there are waiters (wait_for_completion() in progress) | ||
89 | * 1 if there are no waiters. | ||
90 | * | ||
91 | */ | ||
92 | static inline bool completion_done(struct completion *x) | ||
93 | { | ||
94 | int ret = 1; | ||
95 | |||
96 | spin_lock_irq(&x->wait.lock); | ||
97 | if (!x->done) | ||
98 | ret = 0; | ||
99 | spin_unlock_irq(&x->wait.lock); | ||
100 | return ret; | ||
101 | } | ||
102 | |||
103 | #endif | 61 | #endif |