mirror of
https://github.com/drasko/codezero.git
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4fb5277123
- Added mutex_trylock() - Implemented most of exchange_registers() - thread_control() now needs a lock for operations that can modify thread context. - thread_start() does not initialise scheduler flags, now done in thread_create. TODO: - Fork/clone'ed threads should retain their context in tcb, not syscall stack. - exchange_registers() calls in userspace need cleaning up.
58 lines
1.2 KiB
C
58 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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{
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irq_local_disable(); /* Even in UP an irq could deadlock us */
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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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{
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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_enable();
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}
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#endif /* __LIB__SPINLOCK_H__ */
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