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#pragma once
#include "proc/sched.h"
#include "proc/spinlock.h"
/*===========
* Structures
*==========*/
typedef struct kmutex
{
ktqueue_t km_waitq; /* wait queue */
struct kthread *km_holder; /* current holder */
list_link_t km_link;
} kmutex_t;
#define KMUTEX_INITIALIZER(mtx) \
{ \
.km_waitq = KTQUEUE_INITIALIZER((mtx).km_waitq), .km_holder = NULL, \
.km_link = LIST_LINK_INITIALIZER((mtx).km_link), \
}
/*==========
* Functions
*=========*/
/**
* Initializes a mutex.
*
* @param mtx the mutex
*/
void kmutex_init(kmutex_t *mtx);
/**
* Locks the specified mutex.
*
* Note: This function may block.
*
* Note: These locks are not re-entrant
*
* @param mtx the mutex to lock
*/
void kmutex_lock(kmutex_t *mtx);
/**
* Unlocks the specified mutex.
*
* @param mtx the mutex to unlock
*/
void kmutex_unlock(kmutex_t *mtx);
/**
* Indicates if a mutex has waiters.
*/
long kmutex_has_waiters(kmutex_t *mtx);
/**
* Indicates if curthr owns a mutex.
*/
long kmutex_owns_mutex(kmutex_t *mtx);
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