Messages in this thread Patch in this message | | | Subject | [PATCH] Completion API extension | From | Thomas Gleixner <> | Date | Wed, 20 Oct 2004 18:31:11 +0200 |
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Additional functions for the completion API.
wait_for_completion_interruptible() wait_for_completion_timeout() wait_for_completion_interruptible_timeout()
Those are neccecary to convert the users of the racy and obsolete sleep_on variants to the completion API
Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Thomas Gleixner <tglx@linutronix.de>
---
2.6.9-bk-041020-thomas/include/linux/completion.h | 6 + 2.6.9-bk-041020-thomas/kernel/sched.c | 94 ++++++++++++++++++++++ 2 files changed, 100 insertions(+)
diff -puN include/linux/completion.h~completion include/linux/completion.h --- 2.6.9-bk-041020/include/linux/completion.h~completion 2004-10-20 15:22:47.000000000 +0200 +++ 2.6.9-bk-041020-thomas/include/linux/completion.h 2004-10-20 15:22:47.000000000 +0200 @@ -28,6 +28,12 @@ static inline void init_completion(struc } extern void FASTCALL(wait_for_completion(struct completion *)); +extern int FASTCALL(wait_for_completion_interruptible(struct completion *)); +extern unsigned long FASTCALL(wait_for_completion_timeout(struct completion *, + unsigned long)); +extern unsigned long FASTCALL(wait_for_completion_timeout_interruptible + (struct completion *, unsigned long)); + extern void FASTCALL(complete(struct completion *)); extern void FASTCALL(complete_all(struct completion *)); diff -puN kernel/sched.c~completion kernel/sched.c --- 2.6.9-bk-041020/kernel/sched.c~completion 2004-10-20 15:22:47.000000000 +0200 +++ 2.6.9-bk-041020-thomas/kernel/sched.c 2004-10-20 15:22:47.000000000 +0200 @@ -2811,6 +2811,100 @@ void fastcall __sched wait_for_completio } EXPORT_SYMBOL(wait_for_completion); +unsigned long fastcall __sched +wait_for_completion_timeout(struct completion *x, unsigned long timeout) +{ + might_sleep(); + + spin_lock_irq(&x->wait.lock); + if (!x->done) { + DECLARE_WAITQUEUE(wait, current); + + wait.flags |= WQ_FLAG_EXCLUSIVE; + __add_wait_queue_tail(&x->wait, &wait); + do { + __set_current_state(TASK_UNINTERRUPTIBLE); + spin_unlock_irq(&x->wait.lock); + timeout = schedule_timeout(timeout); + if (!timeout) + goto out; + spin_lock_irq(&x->wait.lock); + } while (!x->done); + __remove_wait_queue(&x->wait, &wait); + } + x->done--; +out: + spin_unlock_irq(&x->wait.lock); + + return timeout; +} +EXPORT_SYMBOL(wait_for_completion_timeout); + +int fastcall __sched wait_for_completion_interruptible(struct completion *x) +{ + int ret = 0; + + might_sleep(); + + spin_lock_irq(&x->wait.lock); + if (!x->done) { + DECLARE_WAITQUEUE(wait, current); + + wait.flags |= WQ_FLAG_EXCLUSIVE; + __add_wait_queue_tail(&x->wait, &wait); + do { + if (signal_pending(current)) { + ret = -ERESTARTSYS; + goto out; + } + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irq(&x->wait.lock); + schedule(); + spin_lock_irq(&x->wait.lock); + } while (!x->done); + __remove_wait_queue(&x->wait, &wait); + } + x->done--; +out: + spin_unlock_irq(&x->wait.lock); + + return ret; +} +EXPORT_SYMBOL(wait_for_completion_interruptible); + +unsigned long fastcall __sched +wait_for_completion_interruptible_timeout(struct completion *x, + unsigned long timeout) +{ + might_sleep(); + + spin_lock_irq(&x->wait.lock); + if (!x->done) { + DECLARE_WAITQUEUE(wait, current); + + wait.flags |= WQ_FLAG_EXCLUSIVE; + __add_wait_queue_tail(&x->wait, &wait); + do { + if (signal_pending(current)) { + timeout = -ERESTARTSYS; + goto out; + } + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irq(&x->wait.lock); + schedule(); + spin_lock_irq(&x->wait.lock); + } while (!x->done); + __remove_wait_queue(&x->wait, &wait); + } + x->done--; +out: + spin_unlock_irq(&x->wait.lock); + + return timeout; +} +EXPORT_SYMBOL(wait_for_completion_interruptible_timeout); + + #define SLEEP_ON_VAR \ unsigned long flags; \ wait_queue_t wait; \ _
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