Max Wash
7c630ece54
these functions can be used when waiting on multiple queues at once, to prevent the thread state from being changed unexpectedly while initialising a set of wait items.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
#ifndef KERNEL_WAIT_H_
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#define KERNEL_WAIT_H_
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#include <kernel/locks.h>
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#include <kernel/queue.h>
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#define wait_event(wq, cond) \
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({ \
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struct thread *self = current_thread(); \
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struct wait_item waiter; \
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wait_item_init(&waiter, self); \
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for (;;) { \
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thread_wait_begin(&waiter, wq); \
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if (cond) { \
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break; \
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} \
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schedule(SCHED_NORMAL); \
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} \
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thread_wait_end(&waiter, wq); \
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})
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struct wait_item {
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struct thread *w_thread;
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struct queue_entry w_entry;
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};
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struct waitqueue {
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struct queue wq_waiters;
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spin_lock_t wq_lock;
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};
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extern void wait_item_init(struct wait_item *item, struct thread *thr);
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extern void thread_wait_begin(struct wait_item *waiter, struct waitqueue *q);
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extern void thread_wait_end(struct wait_item *waiter, struct waitqueue *q);
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extern void thread_wait_begin_nosleep(
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struct wait_item *waiter,
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struct waitqueue *q);
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extern void thread_wait_end_nosleep(
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struct wait_item *waiter,
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struct waitqueue *q);
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extern void wait_on_queue(struct waitqueue *q);
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extern void wakeup_queue(struct waitqueue *q);
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extern void wakeup_one(struct waitqueue *q);
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#endif
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