49 lines
806 B
C
49 lines
806 B
C
#include <sys/rwlock.h>
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#ifdef DEBUG_SUBSYSTEM
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#undef DEBUG_SUBSYSTEM
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#endif
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#define DEBUG_SUBSYSTEM S_RWLOCK
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int
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__rw_read_held(krwlock_t *rwlp)
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{
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ENTRY;
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ASSERT(rwlp->rw_magic == RW_MAGIC);
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RETURN(__rw_lock_held(rwlp) && rwlp->rw_owner == NULL);
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}
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EXPORT_SYMBOL(__rw_read_held);
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int
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__rw_write_held(krwlock_t *rwlp)
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{
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ENTRY;
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ASSERT(rwlp->rw_magic == RW_MAGIC);
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RETURN(rwlp->rw_owner == current);
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}
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EXPORT_SYMBOL(__rw_write_held);
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int
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__rw_lock_held(krwlock_t *rwlp)
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{
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int rc = 0;
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ENTRY;
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ASSERT(rwlp->rw_magic == RW_MAGIC);
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spin_lock_irq(&(rwlp->rw_sem.wait_lock));
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#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
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if (rwlp->rw_sem.activity != 0) {
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#else
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if (rwlp->rw_sem.count != 0) {
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#endif
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rc = 1;
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}
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spin_unlock_irq(&(rwlp->rw_sem.wait_lock));
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RETURN(rc);
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}
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EXPORT_SYMBOL(__rw_lock_held);
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