Initial project import

tools/v/vlib/builtin/prealloc_atomics.h

@@ -0,0 +1,34 @@
+#ifndef V_PREALLOC_ATOMICS_H
+#define V_PREALLOC_ATOMICS_H
+
+#if defined(_MSC_VER)
+#include <intrin.h>
+static inline int v_prealloc_atomic_add_i32(int *ptr, int delta) {
+	return (int)_InterlockedExchangeAdd((volatile long*)ptr, (long)delta) + delta;
+}
+static inline int v_prealloc_atomic_load_i32(int *ptr) {
+	return (int)_InterlockedCompareExchange((volatile long*)ptr, 0, 0);
+}
+static inline int v_prealloc_atomic_store_i32(int *ptr, int val) {
+	_InterlockedExchange((volatile long*)ptr, (long)val);
+	return val;
+}
+static inline int v_prealloc_atomic_cas_i32(int *ptr, int expected, int desired) {
+	return _InterlockedCompareExchange((volatile long*)ptr, (long)desired, (long)expected) == expected;
+}
+#else
+static inline int v_prealloc_atomic_add_i32(int *ptr, int delta) {
+	return __sync_add_and_fetch(ptr, delta);
+}
+static inline int v_prealloc_atomic_load_i32(int *ptr) {
+	return __sync_add_and_fetch(ptr, 0);
+}
+static inline int v_prealloc_atomic_store_i32(int *ptr, int val) {
+	return __sync_lock_test_and_set(ptr, val);
+}
+static inline int v_prealloc_atomic_cas_i32(int *ptr, int expected, int desired) {
+	return __sync_bool_compare_and_swap(ptr, expected, desired);
+}
+#endif
+
+#endif