lock.c

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#include <l4/dde/ddekit/lock.h>
#include <l4/dde/ddekit/memory.h>

#include <l4/lock/lock.h>
#include <l4/util/macros.h>

#define DDEKIT_DEBUG_LOCKS 0

struct ddekit_lock {
        l4lock_t lock;
};

void _ddekit_lock_init(struct ddekit_lock **mtx) {
        *mtx = (struct ddekit_lock *) ddekit_simple_malloc(sizeof(struct ddekit_lock));
        (*mtx)->lock = L4LOCK_UNLOCKED;
}

void _ddekit_lock_deinit(struct ddekit_lock **mtx) {
        ddekit_simple_free(*mtx);
        *mtx = NULL;
}

void _ddekit_lock_lock(struct ddekit_lock **mtx) {
#if DDEKIT_DEBUG_LOCKS
        if (&(*mtx)->lock == 0x35ac)
                LOG("DOWN %p: "l4util_idfmt" <-> "l4util_idfmt, 
                        &(*mtx)->lock,
                        l4util_idstr(l4_myself()),
                        l4util_idstr(l4thread_l4_id(l4lock_owner(&((*mtx)->lock)))));
#endif
        l4lock_lock(&(*mtx)->lock);
#if DDEKIT_DEBUG_LOCKS
        if (&(*mtx)->lock == 0x35ac)
                LOG("DOWN %p! "l4util_idfmt, &(*mtx)->lock, l4util_idstr(l4_myself()));
#endif
}

/* returns 0 on success, != 0 if it would block */
int _ddekit_lock_try_lock(struct ddekit_lock **mtx) {
        return l4lock_try_lock(&(*mtx)->lock) ? 0 : 1;
}

void _ddekit_lock_unlock(struct ddekit_lock **mtx) {
#if DDEKIT_DEBUG_LOCKS
        if (&(*mtx)->lock == 0x35ac)
                LOG("UP   %p: "l4util_idfmt" <-> "l4util_idfmt, 
                        &(*mtx)->lock,
                        l4util_idstr(l4_myself()),
                        l4util_idstr(l4thread_l4_id(l4lock_owner(&((*mtx)->lock)))));
#endif
        l4lock_unlock(&(*mtx)->lock);
#if DDEKIT_DEBUG_LOCKS
        if (&(*mtx)->lock == 0x35ac)
                LOG("UP %p! "l4util_idfmt, &(*mtx)->lock, l4util_idstr(l4_myself()));
#endif
}


int _ddekit_lock_owner(struct ddekit_lock **mtx) {
        return (int)l4lock_owner(&(*mtx)->lock);
}

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