mem.c: add fallback implementations for stdatomic functions

yamt · Aug 11, 2024 · 1cc6d38 · 1cc6d38
1 parent fc7ce01
commit 1cc6d38
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/lib/mem.c b/lib/mem.c
@@ -13,6 +13,24 @@
 
 #include "mem.h"
 
+#if defined(__STDC_NO_ATOMICS__)
+static size_t
+atomic_fetch_sub(size_t *p, size_t diff)
+{
+        size_t ov = *p;
+        *p -= diff;
+        return ov;
+}
+
+static bool
+atomic_compare_exchange_weak(size_t *p, size_t *ov, size_t nv)
+{
+        assert(*p == *ov);
+        *p = nv;
+        return true;
+}
+#endif
+
 #if defined(TOYWASM_ENABLE_HEAP_TRACKING)
 static void
 mem_unreserve_one(struct mem_context *ctx, size_t diff)