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/*
* locks for newlib
*
* Samuel Thibault <Samuel.Thibault@eu.citrix.net>, July 20008
*/
#ifdef HAVE_LIBC
#include <sys/lock.h>
#include <sched.h>
#include <wait.h>
int ___lock_init(_LOCK_T *lock)
{
lock->busy = 0;
init_waitqueue_head(&lock->wait);
return 0;
}
int ___lock_acquire(_LOCK_T *lock)
{
unsigned long flags;
while(1) {
wait_event(lock->wait, !lock->busy);
local_irq_save(flags);
if (!lock->busy)
break;
local_irq_restore(flags);
}
lock->busy = 1;
local_irq_restore(flags);
return 0;
}
int ___lock_try_acquire(_LOCK_T *lock)
{
unsigned long flags;
int ret = -1;
local_irq_save(flags);
if (!lock->busy) {
lock->busy = 1;
ret = 0;
}
local_irq_restore(flags);
return ret;
}
int ___lock_release(_LOCK_T *lock)
{
unsigned long flags;
local_irq_save(flags);
lock->busy = 0;
wake_up(&lock->wait);
local_irq_restore(flags);
return 0;
}
int ___lock_init_recursive(_LOCK_RECURSIVE_T *lock)
{
lock->owner = NULL;
init_waitqueue_head(&lock->wait);
return 0;
}
int ___lock_acquire_recursive(_LOCK_RECURSIVE_T *lock)
{
unsigned long flags;
if (lock->owner != get_current()) {
while (1) {
wait_event(lock->wait, lock->owner == NULL);
local_irq_save(flags);
if (lock->owner == NULL)
break;
local_irq_restore(flags);
}
lock->owner = get_current();
local_irq_restore(flags);
}
lock->count++;
return 0;
}
int ___lock_try_acquire_recursive(_LOCK_RECURSIVE_T *lock)
{
unsigned long flags;
int ret = -1;
local_irq_save(flags);
if (!lock->owner) {
ret = 0;
lock->owner = get_current();
lock->count++;
}
local_irq_restore(flags);
return ret;
}
int ___lock_release_recursive(_LOCK_RECURSIVE_T *lock)
{
unsigned long flags;
BUG_ON(lock->owner != get_current());
if (--lock->count)
return 0;
local_irq_save(flags);
lock->owner = NULL;
wake_up(&lock->wait);
local_irq_restore(flags);
return 0;
}
#endif
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