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java.lang.Object
   |
   +----utah.npm.core.Lockable
           |
           +----utah.npm.core.NPMObject
                   |
                   +----utah.npm.core.Refable
                           |
                           +----utah.npm.core.Mutex

Summary

public final class  Mutex
     extends utah.npm.core.Refable
{
          // Fields 2
     private Link owner_;
     private Lock s_mutex_;

          // Constructors 2
     public Mutex();
     public Mutex(int);

          // Methods 8
     static String typeName();

     public void destroy();
     public void lock();
     void s_init(int);
     int s_type();
     public String toString();
     public boolean trylock();
     public void unlock();
}

Implement an NPM Mutex object. Mutex objects are guaranteed to exists in the typespace of all Processes and to work across Process boundaries.

Version:

NPMJava 0.5.0 April, 1998

Author:

Patrick Tullmann tullmann@cs.utah.edu

Fields

· s_mutex_

Summary  |  Top

   private Lock s_mutex_

The internal Lock object that actually implements the Mutex interface.

   private Link owner_

A link to the current owner of the Mutex.

TODO: This information is duplicated at every level of the lock implmenetation.

Constructors

· Mutex

Summary  |  Top

   public Mutex() 

   public Mutex(int hashCode) 

   void s_init(int hashCode) 

Overrides:

s_init in class Refable

   public void destroy() 

Overrides:

destroy in class Refable

   public void lock() 

   public void unlock() 

   public boolean trylock() 

   public String toString() 

Overrides:

toString in class NPMObject

   static String typeName() 

Overrides:

typeName in class NPMObject

   int s_type() 

Overrides:

s_type in class NPMObject

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