VM: Fix an app-jit related shutdown race.

runtime/include/dart_api.h

 /*
  * Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
 
 #ifndef RUNTIME_INCLUDE_DART_API_H_
 #define RUNTIME_INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
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  * This function should be used to dispose of native resources that
  * are allocated to an isolate in order to avoid leaks.
  *
  * \param callback_data The same callback data which was passed to the
  *   isolate when it was created.
  *
  */
 typedef void (*Dart_IsolateShutdownCallback)(void* callback_data);
 
 /**
+ * An isolate cleanup callback function.
+ *
+ * This callback, provided by the embedder, is called after the vm
+ * shuts down an isolate. There will be no current isolate and it is *not*
+ * safe to run Dart code.
+ *
+ * This function should be used to dispose of native resources that
+ * are allocated to an isolate in order to avoid leaks.
+ *
+ * \param callback_data The same callback data which was passed to the
+ *   isolate when it was created.
+ *
+ */
+typedef void (*Dart_IsolateCleanupCallback)(void* callback_data);
+
+/**
  * A thread death callback function.
  * This callback, provided by the embedder, is called before a thread in the
  * vm thread pool exits.
  * This function could be used to dispose of native resources that
  * are associated and attached to the thread, in order to avoid leaks.
  */
 typedef void (*Dart_ThreadExitCallback)();
 
 /**
  * Callbacks provided by the embedder for file operations. If the
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  * \param version Identifies the version of the struct used by the client.
  *   should be initialized to DART_INITIALIZE_PARAMS_CURRENT_VERSION.
  * \param vm_isolate_snapshot A buffer containing a snapshot of the VM isolate
  *   or NULL if no snapshot is provided.
  * \param instructions_snapshot A buffer containing a snapshot of precompiled
  *   instructions, or NULL if no snapshot is provided.
  * \param create A function to be called during isolate creation.
  *   See Dart_IsolateCreateCallback.
  * \param shutdown A function to be called when an isolate is shutdown.
  *   See Dart_IsolateShutdownCallback.
+ * \param cleanup A function to be called after an isolate is shutdown.
+ *   See Dart_IsolateCleanupCallback.
  * \param get_service_assets A function to be called by the service isolate when
  *    it requires the vmservice assets archive.
  *    See Dart_GetVMServiceAssetsArchive.
  */
 typedef struct {
   int32_t version;
   const uint8_t* vm_snapshot_data;
   const uint8_t* vm_snapshot_instructions;
   Dart_IsolateCreateCallback create;
   Dart_IsolateShutdownCallback shutdown;
+  Dart_IsolateCleanupCallback cleanup;
   Dart_ThreadExitCallback thread_exit;
   Dart_FileOpenCallback file_open;
   Dart_FileReadCallback file_read;
   Dart_FileWriteCallback file_write;
   Dart_FileCloseCallback file_close;
   Dart_EntropySource entropy_source;
   Dart_GetVMServiceAssetsArchive get_service_assets;
 } Dart_InitializeParams;
 
 /**
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  */
 DART_EXPORT bool Dart_IsPrecompiledRuntime();
 
 
 /**
  *  Print a native stack trace. Used for crash handling.
  */
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context);
 
 #endif /* INCLUDE_DART_API_H_ */ /* NOLINT */