sync: own submodule for atomic

vlib/sync/atomic2/atomic.v

@@ -0,0 +1,55 @@
+module atomic2
+
+/*
+Implements the atomic operations. For now TCC does not support
+the atomic versions on nix so it uses locks to simulate the same behavor.
+On windows tcc can simulate with other atomic operations.
+
+The @VROOT/thirdparty/stdatomic contains compability header files
+for stdatomic that supports both nix, windows and c++.
+
+This implementations should be regarded as alpha stage and be
+further tested.
+*/
+#flag windows -I @VROOT/thirdparty/stdatomic/win
+#flag linux -I @VROOT/thirdparty/stdatomic/nix
+#flag darwin -I @VROOT/thirdparty/stdatomic/nix
+#flag freebsd -I @VROOT/thirdparty/stdatomic/nix
+#flag solaris -I @VROOT/thirdparty/stdatomic/nix
+
+#include "atomic.h"
+
+fn C.atomic_fetch_add_explicit() int
+fn C.atomic_fetch_sub_explicit() int
+
+[typedef]
+struct C.atomic_ullong {
+}
+
+[typedef]
+struct C.atomic_llong {
+}
+
+// add_u64 adds provided delta as an atomic operation
+pub fn add_u64(ptr &u64, delta int) bool {
+	res := C.atomic_fetch_add_explicit(&C.atomic_ullong(ptr), delta, C.NULL)
+	return res == 0
+}
+
+// sub_u64 subtracts provided delta as an atomic operation
+pub fn sub_u64(ptr &u64, delta int) bool {
+	res := C.atomic_fetch_sub_explicit(&C.atomic_ullong(ptr), delta, C.NULL)
+	return res == 0
+}
+
+// add_i64 adds provided delta as an atomic operation
+pub fn add_i64(ptr &i64, delta int) bool {
+	res := C.atomic_fetch_add_explicit(&C.atomic_llong(ptr), delta, C.NULL)
+	return res == 0
+}
+
+// add_i64 subtracts provided delta as an atomic operation
+pub fn sub_i64(ptr &i64, delta int) bool {
+	res := C.atomic_fetch_sub_explicit(&C.atomic_llong(ptr), delta, C.NULL)
+	return res == 0
+}