Enable shared memory && add pthread support (#282)

core/iwasm/include/wasm_export.h

@@ -319,7 +319,7 @@ wasm_runtime_lookup_wasi_start_function(wasm_module_inst_t module_inst);
  * @param name the name of the function
  * @param signature the signature of the function, ignored currently
  *
- * @return the function instance found. Otherwise NULL will be returned.
+ * @return the function instance found, NULL if not found
  */
 wasm_function_inst_t
 wasm_runtime_lookup_function(wasm_module_inst_t const module_inst,
@@ -331,7 +331,8 @@ wasm_runtime_lookup_function(wasm_module_inst_t const module_inst,
  * @param module_inst the module instance
  * @param stack_size the stack size to execute a WASM function
  *
- * @return the execution environment. In case of invalid stack size, NULL will be returned.
+ * @return the execution environment, NULL if failed, e.g. invalid
+ *         stack size is passed
  */
 wasm_exec_env_t
 wasm_runtime_create_exec_env(wasm_module_inst_t module_inst,
@@ -386,7 +387,7 @@ wasm_runtime_call_wasm(wasm_exec_env_t exec_env,
  * @param argv the arguments array
  *
  * @return true if the main function is called, false otherwise and exception
- *   will be thrown, the caller can call wasm_runtime_get_exception to get 
+ *   will be thrown, the caller can call wasm_runtime_get_exception to get
  *   the exception info.
  */
 bool
@@ -679,6 +680,16 @@ wasm_runtime_set_user_data(wasm_exec_env_t exec_env,
 void *
 wasm_runtime_get_user_data(wasm_exec_env_t exec_env);
 
+#if WASM_ENABLE_THREAD_MGR != 0
+/**
+ * Set the max thread num per cluster.
+ *
+ * @param num maximum thread num
+ */
+void
+wasm_runtime_set_max_thread_num(uint32_t num);
+#endif
+
 #ifdef __cplusplus
 }
 #endif