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Remove struct spinlock to cleanup some mess and simplify. It's only used in boosting for multiprocesors and a pure two-corelock heirarchy will do just fine.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19910 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2009-02-03 12:16:45 +00:00
parent e2a169bce5
commit 3cf148945e
4 changed files with 18 additions and 99 deletions
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51
firmware/kernel.c
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@ -961,57 +961,6 @@ void mutex_unlock(struct mutex *m)
}
}
/****************************************************************************
* Simpl-er mutex functions ;)
****************************************************************************/
#if NUM_CORES > 1
void spinlock_init(struct spinlock *l)
{
corelock_init(&l->cl);
l->thread = NULL;
l->count = 0;
}
void spinlock_lock(struct spinlock *l)
{
const unsigned int core = CURRENT_CORE;
struct thread_entry *current = cores[core].running;
if(l->thread == current)
{
/* current core already owns it */
l->count++;
return;
}
/* lock against other processor cores */
corelock_lock(&l->cl);
/* take ownership */
l->thread = current;
}
void spinlock_unlock(struct spinlock *l)
{
/* unlocker not being the owner is an unlocking violation */
KERNEL_ASSERT(l->thread == cores[CURRENT_CORE].running,
"spinlock_unlock->wrong thread\n");
if(l->count > 0)
{
/* this core still owns lock */
l->count--;
return;
}
/* clear owner */
l->thread = NULL;
/* release lock */
corelock_unlock(&l->cl);
}
#endif /* NUM_CORES > 1 */
/****************************************************************************
* Simple semaphore functions ;)
****************************************************************************/