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https://github.com/xen-project/xen.git
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Keir Fraser
7a0db9514b
Currently the minios headers do this: #define current get_current() Obviously when porting general code to this environment, this can cause problems ! The attached patch arranges for this only to be done if #define __MINIOS__ is declared, which is set up by the makefile in extras/mini-os. Suppressing the namespace pollution is necessary to get recent upstream qemu's to compile, since they (quite properly) use `current' as an ordinary identifier. Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
#ifndef __WAIT_H__
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#define __WAIT_H__
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#include <mini-os/sched.h>
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#include <mini-os/os.h>
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#include <mini-os/waittypes.h>
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#define DEFINE_WAIT(name) \
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struct wait_queue name = { \
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.thread = get_current(), \
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.thread_list = MINIOS_LIST_HEAD_INIT((name).thread_list), \
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}
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static inline void init_waitqueue_head(struct wait_queue_head *h)
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{
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MINIOS_INIT_LIST_HEAD(&h->thread_list);
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}
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static inline void init_waitqueue_entry(struct wait_queue *q, struct thread *thread)
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{
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q->thread = thread;
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MINIOS_INIT_LIST_HEAD(&q->thread_list);
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}
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static inline void add_wait_queue(struct wait_queue_head *h, struct wait_queue *q)
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{
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if (minios_list_empty(&q->thread_list))
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minios_list_add(&q->thread_list, &h->thread_list);
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}
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static inline void remove_wait_queue(struct wait_queue *q)
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{
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minios_list_del(&q->thread_list);
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}
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static inline void wake_up(struct wait_queue_head *head)
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{
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unsigned long flags;
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struct minios_list_head *tmp, *next;
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local_irq_save(flags);
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minios_list_for_each_safe(tmp, next, &head->thread_list)
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{
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struct wait_queue *curr;
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curr = minios_list_entry(tmp, struct wait_queue, thread_list);
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wake(curr->thread);
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}
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local_irq_restore(flags);
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}
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#define add_waiter(w, wq) do { \
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unsigned long flags; \
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local_irq_save(flags); \
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add_wait_queue(&wq, &w); \
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block(get_current()); \
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local_irq_restore(flags); \
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} while (0)
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#define remove_waiter(w) do { \
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unsigned long flags; \
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local_irq_save(flags); \
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remove_wait_queue(&w); \
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local_irq_restore(flags); \
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} while (0)
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#define wait_event_deadline(wq, condition, deadline) do { \
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unsigned long flags; \
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DEFINE_WAIT(__wait); \
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if(condition) \
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break; \
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for(;;) \
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{ \
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/* protect the list */ \
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local_irq_save(flags); \
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add_wait_queue(&wq, &__wait); \
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get_current()->wakeup_time = deadline; \
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clear_runnable(get_current()); \
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local_irq_restore(flags); \
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if((condition) || (deadline && NOW() >= deadline)) \
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break; \
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schedule(); \
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} \
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local_irq_save(flags); \
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/* need to wake up */ \
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wake(get_current()); \
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remove_wait_queue(&__wait); \
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local_irq_restore(flags); \
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} while(0)
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#define wait_event(wq, condition) wait_event_deadline(wq, condition, 0)
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#endif /* __WAIT_H__ */
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