44 lines
765 B
C
Executable File
44 lines
765 B
C
Executable File
#include "types.h"
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#include "cpulock.h"
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#include "spinlock.h"
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void spinlock_init(spinlock_t *lock)
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{
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lock->val &= ~3UL;
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}
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void spinlock_invalidate(spinlock_t *lock)
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{
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// TODO:原子操作
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umword_t status = 0;
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cpulock_lock();
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lock->val |= 1UL;
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cpulock_set(status);
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}
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bool_t spinlock_is_invalidation(spinlock_t *lock)
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{
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return lock->val & 1UL;
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}
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mword_t spinlock_lock(spinlock_t *lock)
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{
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umword_t status = 0;
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#if SMP
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status = cpulock_lock();
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if (spinlock_is_invalidation(lock))
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{
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cpulock_set(status);
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return -1;
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}
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#else
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#error “不支持SMP”
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#endif
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return status;
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}
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void spinlock_set(spinlock_t *lock, mword_t status)
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{
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#if SMP
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cpulock_set(status);
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#else
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#error “不支持SMP”
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#endif
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}
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