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use sgx_types::{self, sgx_spinlock_t};
use core::marker;
use core::cell::UnsafeCell;
unsafe fn raw_lock(lock: &mut sgx_spinlock_t) -> *mut sgx_spinlock_t {
lock as *mut _
}
unsafe fn rsgx_spin_lock(lock: &mut sgx_spinlock_t) {
sgx_types::sgx_spin_lock(raw_lock(lock));
}
unsafe fn rsgx_spin_unlock(lock: &mut sgx_spinlock_t) {
sgx_types::sgx_spin_unlock(raw_lock(lock));
}
pub struct SgxThreadSpinlock {
lock: UnsafeCell<sgx_spinlock_t>,
}
unsafe impl Send for SgxThreadSpinlock {}
unsafe impl Sync for SgxThreadSpinlock {}
impl SgxThreadSpinlock {
pub const fn new() -> SgxThreadSpinlock {
SgxThreadSpinlock{ lock: UnsafeCell::new(sgx_types::SGX_SPINLOCK_INITIALIZER) }
}
pub unsafe fn lock(&self) {
rsgx_spin_lock(&mut *self.lock.get());
}
pub unsafe fn unlock(&self) {
rsgx_spin_unlock(&mut *self.lock.get());
}
}
pub struct SgxSpinlock {
inner: SgxThreadSpinlock,
}
unsafe impl Send for SgxSpinlock {}
unsafe impl Sync for SgxSpinlock {}
impl SgxSpinlock {
pub fn new() -> SgxSpinlock {
SgxSpinlock{inner: SgxThreadSpinlock::new()}
}
pub fn lock(&self) -> SgxSpinlockGuard {
unsafe {
self.inner.lock();
SgxSpinlockGuard::new(self)
}
}
}
impl Default for SgxSpinlock {
fn default() -> SgxSpinlock {
SgxSpinlock::new()
}
}
pub struct SgxSpinlockGuard<'a> {
lock: &'a SgxSpinlock,
}
impl<'a> !marker::Send for SgxSpinlockGuard<'a> { }
impl<'spinlock> SgxSpinlockGuard<'spinlock> {
unsafe fn new(lock: &'spinlock SgxSpinlock) -> Self {
SgxSpinlockGuard{lock: lock}
}
}
impl<'a> Drop for SgxSpinlockGuard<'a> {
fn drop(&mut self) {
unsafe {
self.lock.inner.unlock();
}
}
}