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BEGIN LICENSE BLOCK ***** Version: EPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Eclipse Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.eclipse.org/legal/epl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2009 Wayne Meissner Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the EPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the EPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 
 package org.jruby.cext;
 
NativeMethod represents a method handle to a C extension function in JRuby, to provide entry points into C code. Native methods setup and tear down scope and context around a native method call and lock the GIL. Native methods restrict concurrency in C extensions to avoid threading issues in C code.
 
 public class NativeMethod extends DynamicMethod {
     protected final Arity arity;
     protected final long function;
     private final Native nativeInstance;
 
     public NativeMethod(RubyModule clazzint aritylong function) {
         super(clazz..);
         this. = Arity.createArity(arity);
         this. = function;
         this. = Native.getInstance(clazz.getRuntime());
     }
 
     @Override
     public final DynamicMethod dup() {
         return this;
     }
 
     @Override
     public final Arity getArity() {
         return ;
     }
 
     @Override
     public final boolean isNative() {
         return true;
     }

    
Pushes the method frame for execution of the native function. Enforces use of a org.jruby.runtime.scope.ManyVarsDynamicScope since we don't know what we will need in the function execution. Lastly, this acquires the GIL for native execution in the current Thread.
 
     static void pre(ThreadContext contextIRubyObject selfRubyModule klazzString name) {
         context.preMethodFrameOnly(klazznameself.);
         DynamicScope currentScope = context.getCurrentScope();
         context.pushScope(new ManyVarsDynamicScope(currentScope.getStaticScope(), currentScope));
         GIL.acquire();
     }

    
 
     static void pre(ThreadContext contextIRubyObject selfRubyModule klazzString nameBlock block) {
         context.preMethodFrameOnly(klazznameselfblock);
         DynamicScope currentScope = context.getCurrentScope();
         context.pushScope(new ManyVarsDynamicScope(currentScope.getStaticScope(), currentScope));
         GIL.acquire();
     }

    
Release the GIL and pop the call frame and scope.
 
     static void post(ThreadContext context) {
         GIL.release();
        context.postMethodFrameAndScope();
    }
    final Native getNativeInstance() {
        return ;
    }
    
    @Override
    public IRubyObject call(ThreadContext contextIRubyObject recvRubyModule clazz,
            String nameIRubyObject[] args) {
        pre(contextrecvgetImplementationClass(), name);
        try {
            return getNativeInstance().callMethod(contextrecv.getValue(), args);
        } finally {
            post(context);
        }
    }
    @Override
    public IRubyObject call(ThreadContext contextIRubyObject recvRubyModule clazz,
            String nameIRubyObject[] argsBlock block) {
        pre(contextrecvgetImplementationClass(), nameblock);
        try {
            return getNativeInstance().callMethod(contextrecv.getValue(), args);
        } finally {
            post(context);
        }
    }
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