temporary undoing of renaming

1 files changed, 45 insertions, 0 deletions

diff --git a/pk/atomic.h b/pk/atomic.h
new file mode 100644
index 0000000..88bb239
--- /dev/null
+++ b/pk/atomic.h
@@ -0,0 +1,45 @@
+#ifndef _RISCV_ATOMIC_H
+#define _RISCV_ATOMIC_H
+
+typedef struct { long val; } atomic_t;
+typedef struct { atomic_t lock; } spinlock_t;
+#define SPINLOCK_INIT {{0}}
+
+static inline long atomic_add(atomic_t* a, long inc)
+{
+  //return __sync_fetch_and_add(&a->val, inc);
+  long ret = a->val;
+  a->val++;
+  return ret;
+}
+
+static inline long atomic_swap(atomic_t* a, long val)
+{
+  //return __sync_lock_test_and_set(&a->val, val);
+  long reg = a->val;
+  a->val = val;
+  return reg;
+}
+
+static inline void atomic_set(atomic_t* a, long val)
+{
+  a->val = val;
+}
+
+static inline long atomic_read(atomic_t* a)
+{
+  return a->val;
+}
+
+static inline void spinlock_lock(spinlock_t* lock)
+{
+  while(atomic_read(&lock->lock))
+    while(atomic_swap(&lock->lock,-1));
+}
+
+static inline void spinlock_unlock(spinlock_t* lock)
+{
+  atomic_set(&lock->lock,0);
+}
+
+#endif