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Changed queue API. Added mutex functions

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@601 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-05-16 20:57:32 +00:00
parent a39f566a7f
commit 7361340ab5
2 changed files with 35 additions and 3 deletions
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27
firmware/kernel.c
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@ -71,14 +71,14 @@ void queue_init(struct event_queue *q)
q->write = 0;
}
struct event *queue_wait(struct event_queue *q)
void queue_wait(struct event_queue *q, struct event *ev)
{
while(q->read == q->write)
{
switch_thread();
}
return &q->events[(q->read++) & QUEUE_LENGTH_MASK];
*ev = q->events[(q->read++) & QUEUE_LENGTH_MASK];
}
void queue_post(struct event_queue *q, int id, void *data)
@ -190,3 +190,26 @@ int tick_remove_task(void (*f)(void))
set_irq_level(oldlevel);
return -1;
}
/****************************************************************************
* Simple mutex functions
****************************************************************************/
void mutex_init(struct mutex *m)
{
m->count = 0;
}
void mutex_lock(struct mutex *m)
{
/* Wait until the lock is open... */
while(m->count)
yield();
/* ...and lock it */
m->count++;
}
void mutex_unlock(struct mutex *m)
{
m->count--;
}