text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  #ifndef SRC_NODE_ISOLATE_H_
  #define SRC_NODE_ISOLATE_H_
  
  #include "v8.h"
  #include "uv.h"
  #include "node_vars.h"
  #include "ngx-queue.h"
  
  #ifdef NDEBUG
  # define NODE_ISOLATE_CHECK(ptr) ((void) (ptr))
  #else
  # include <assert.h>
  # define NODE_ISOLATE_CHECK(ptr)                        \
    do {                                                  \
      node::Isolate* data_ = node::Isolate::GetCurrent(); \
      assert(data_ == (ptr));                             \
    }                                                     \
    while (0)
  #endif
  
  
  namespace node {
  
  class Isolate {
  public:
    char** argv_;
    int argc_;
    uv_thread_t tid_;
  
    // Call this before instantiating any Isolate
    static void Initialize();
    static int Count();
  
    typedef void (*AtExitCallback)(void* arg);
  
    static void JoinAll();
  
    static Isolate* GetCurrent() {
      return reinterpret_cast<Isolate*>(v8::Isolate::GetCurrent()->GetData());
    }
  
    uv_loop_t* GetLoop() {
      NODE_ISOLATE_CHECK(this);
      return loop_;
    }
  
    v8::Isolate* GetV8Isolate() {
      NODE_ISOLATE_CHECK(this);
      return v8_isolate_;
    }
  
    v8::Handle<v8::Context> GetV8Context() {
      NODE_ISOLATE_CHECK(this);
      return v8_context_;
    }
  
    /* Register a handler that should run when the current isolate exits.
     * Handlers run in LIFO order.
     */
    void AtExit(AtExitCallback callback, void *arg);
  
    struct globals* Globals();
  
    unsigned int id_;
  
    // This constructor is used for every non-main thread
    Isolate();
  
    ~Isolate() {
      if (argv_) {
        delete argv_;
      }
    }
  
    void Enter();
  
    /* Shutdown the isolate. Call this method at thread death. */
    void Dispose();
  
  private:
  
    struct AtExitCallbackInfo {
      ngx_queue_t at_exit_callbacks_;
      AtExitCallback callback_;
      void* arg_;
    };
  
    ngx_queue_t at_exit_callbacks_;
    v8::Persistent<v8::Context> v8_context_;
    v8::Isolate* v8_isolate_;
    uv_loop_t* loop_;
  
    // Each isolate is a member of the static list_head.
    ngx_queue_t list_member_;
  
    // Global variables for this isolate.
    struct globals globals_;
    bool globals_init_;
  };
  
  } // namespace node
  
  #endif // SRC_NODE_ISOLATE_H_
  