Enable controlling concurrency_support in the C API (#12703)

* Enable controlling `concurrency_support` in the C API

Related to #12691

* clang-format

Author: alexcrichton

crates/c-api/include/wasmtime/config.h

@@ -824,6 +824,15 @@ WASM_API_EXTERN void wasmtime_pooling_allocation_strategy_set(
  */
 WASMTIME_CONFIG_PROP(void, wasm_component_model, bool)
 
+/**
+ * \brief Specifies whether support for concurrent execution of WebAssembly is
+ * supported within this store.
+ *
+ * For more information see the Rust documentation at
+ * https://docs.wasmtime.dev/api/wasmtime/struct.Config.html#method.concurrency_support.
+ */
+WASMTIME_CONFIG_PROP(void, concurrency_support, bool)
+
 #endif // WASMTIME_FEATURE_COMPONENT_MODEL
 
 #ifdef __cplusplus

crates/c-api/include/wasmtime/config.hh

@@ -619,6 +619,17 @@ public:
     wasmtime_pooling_allocation_strategy_set(ptr.get(), config.capi());
   }
 #endif // WASMTIME_FEATURE_POOLING_ALLOCATOR
+
+  /**
+   * \brief Specifies whether support for concurrent execution of WebAssembly is
+   * supported within this store.
+   *
+   * For more information see the Rust documentation at
+   * https://docs.wasmtime.dev/api/wasmtime/struct.Config.html#method.concurrency_support.
+   */
+  void concurrency_support(bool enable) {
+    wasmtime_config_concurrency_support_set(ptr.get(), enable);
+  }
 };
 
 } // namespace wasmtime

crates/c-api/src/config.rs

@@ -697,3 +697,8 @@ pub extern "C" fn wasmtime_pooling_allocation_strategy_set(
     c.config
         .allocation_strategy(InstanceAllocationStrategy::Pooling(pc.config.clone()));
 }
+
+#[unsafe(no_mangle)]
+pub extern "C" fn wasmtime_config_concurrency_support_set(c: &mut wasm_config_t, enable: bool) {
+    c.config.concurrency_support(enable);
+}

crates/c-api/tests/config.cc

@@ -69,6 +69,7 @@ TEST(Config, Smoke) {
   config.cranelift_flag_set("foo", "bar");
   EXPECT_TRUE(config.cache_load_default());
   EXPECT_FALSE(config.cache_load("nonexistent"));
+  config.concurrency_support(false);
 
   PoolAllocationConfig pooling_config;
   config.pooling_allocation_strategy(pooling_config);