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5fd0f12017
Previously all pending events were handled on return of exceptions in process context. This was causing threads that run in userspace and take no exceptions not handle their pending events indefinitely. Now scheduler handles them in irq context as well.
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
#ifndef __LIB_SPINLOCK_H__
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#define __LIB_SPINLOCK_H__
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#include <l4/lib/string.h>
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#include <l4/generic/preempt.h>
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#include INC_ARCH(exception.h)
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struct spinlock {
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unsigned int lock;
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};
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static inline void spin_lock_init(struct spinlock *s)
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{
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memset(s, 0, sizeof(struct spinlock));
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}
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/*
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* - Guards from deadlock against local processes, but not local irqs.
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* - To be used for synchronising against processes on *other* cpus.
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*/
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static inline void spin_lock(struct spinlock *s)
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{
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preempt_disable(); /* This must disable local preempt */
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#if defined(CONFIG_SMP)
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__spin_lock(&s->lock);
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#endif
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}
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static inline void spin_unlock(struct spinlock *s)
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{
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#if defined(CONFIG_SMP)
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__spin_unlock(&s->lock);
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#endif
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preempt_enable();
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}
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/*
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* - Guards from deadlock against local processes *and* local irqs.
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* - To be used for synchronising against processes and irqs
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* on other cpus.
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*/
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static inline void spin_lock_irq(struct spinlock *s,
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unsigned long state)
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{
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irq_local_disable_save(&state);
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#if defined(CONFIG_SMP)
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__spin_lock(&s->lock);
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#endif
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}
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static inline void spin_unlock_irq(struct spinlock *s,
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unsigned long state)
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{
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#if defined(CONFIG_SMP)
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__spin_unlock(&s->lock);
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#endif
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irq_local_restore(state);
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}
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#endif /* __LIB__SPINLOCK_H__ */
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