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Add a lightweight wakeup object for fast processors.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16885 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-03-30 04:59:51 +00:00
parent 8a6fd3ff4e
commit bc192c953e
3 changed files with 105 additions and 0 deletions
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78
firmware/kernel.c
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@ -1368,3 +1368,81 @@ void event_set_state(struct event *e, unsigned int state)
#endif
}
#endif /* HAVE_EVENT_OBJECTS */
#ifdef HAVE_WAKEUP_OBJECTS
/****************************************************************************
* Lightweight IRQ-compatible wakeup object
*/
/* Initialize the wakeup object */
void wakeup_init(struct wakeup *w)
{
w->queue = NULL;
w->signalled = 0;
IF_COP( corelock_init(&w->cl); )
}
/* Wait for a signal blocking indefinitely or for a specified period */
int wakeup_wait(struct wakeup *w, int timeout)
{
int ret = WAIT_SUCCEEDED; /* Presume success */
int oldlevel = disable_irq_save();
corelock_lock(&w->cl);
if(w->signalled == 0 && timeout != TIMEOUT_NOBLOCK)
{
struct thread_entry * current = cores[CURRENT_CORE].running;
IF_COP( current->obj_cl = &w->cl; )
current->bqp = &w->queue;
if (timeout != TIMEOUT_BLOCK)
block_thread_w_tmo(current, timeout);
else
block_thread(current);
corelock_unlock(&w->cl);
switch_thread();
oldlevel = disable_irq_save();
corelock_lock(&w->cl);
}
if(w->signalled == 0)
{
/* Timed-out or failed */
ret = (timeout != TIMEOUT_BLOCK) ? WAIT_TIMEDOUT : WAIT_FAILED;
}
w->signalled = 0; /* Reset */
corelock_unlock(&w->cl);
restore_irq(oldlevel);
return ret;
}
/* Signal the thread waiting or leave the signal if the thread hasn't
* waited yet.
*
* returns THREAD_NONE or THREAD_OK
*/
int wakeup_signal(struct wakeup *w)
{
int oldlevel = disable_irq_save();
int ret;
corelock_lock(&w->cl);
w->signalled = 1;
ret = wakeup_thread(&w->queue);
corelock_unlock(&w->cl);
restore_irq(oldlevel);
return ret;
}
#endif /* HAVE_WAKEUP_OBJECTS */