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#include <cthreads.h>
#include "ddekit/lock.h"
#include "ddekit/memory.h"
#define DDEKIT_DEBUG_LOCKS 0
struct ddekit_lock {
struct mutex lock;
cthread_t helder;
};
void _ddekit_lock_init(struct ddekit_lock **mtx) {
struct ddekit_lock *lock;
lock = (struct ddekit_lock *) ddekit_simple_malloc (sizeof *lock);
mutex_init (&lock->lock);
lock->helder = NULL;
*mtx = lock;
}
void _ddekit_lock_deinit(struct ddekit_lock **mtx) {
mutex_free (*mtx);
*mtx = NULL;
}
void _ddekit_lock_lock(struct ddekit_lock **mtx) {
mutex_lock (&(*mtx)->lock);
(*mtx)->helder = cthread_self ();
}
/* returns 0 on success, != 0 if it would block */
int _ddekit_lock_try_lock(struct ddekit_lock **mtx) {
if (mutex_try_lock (&(*mtx)->lock)) { /* lock succeessfully */
(*mtx)->helder = cthread_self ();
return 0;
}
return -1;
}
void _ddekit_lock_unlock(struct ddekit_lock **mtx) {
// TODO I wonder if it can cause any trouble.
(*mtx)->helder = NULL;
mutex_unlock (&(*mtx)->lock);
}
int _ddekit_lock_owner(struct ddekit_lock **mtx) {
/* The return value is the address of the holder.
* I hope it will be OK. At least, it is OK
* for the current implementation of DDE Linux/BSD */
return (int) (*mtx)->helder;
}
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