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#include "pthread_impl.h"
#include "fork_impl.h"
static volatile int vmlock[2];
volatile int *const __vmlock_lockptr = vmlock;
void __vm_wait()
{
int tmp;
while ((tmp=vmlock[0]))
__wait(vmlock, vmlock+1, tmp, 1);
}
void __vm_lock()
{
a_inc(vmlock);
}
void __vm_unlock()
{
if (a_fetch_add(vmlock, -1)==1 && vmlock[1])
__wake(vmlock, -1, 1);
}
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