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forkwork.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/

#ifndef __FORKWORK_H__
#define __FORKWORD_H__

#include "condor_daemon_core.h"

// Return values of ForkerWorker::Fork()
enum ForkStatus {
      FORK_FAILED = -1,
      FORK_PARENT = 0,
      FORK_BUSY = 1,
      FORK_CHILD = 2
};

// A fork worker process
class ForkWorker
{
  public:
      ForkWorker( void );
      virtual ~ForkWorker( void );

      ForkStatus Fork( void );
      pid_t getPid( void ) { return pid; };
      pid_t getParent( void ) { return parent; };

  private:
      pid_t       pid;
      pid_t       parent;
      int               valid;
};

class ForkWork : public Service
{
  public:
      ForkWork( int max_workers = 0 );
      virtual ~ForkWork( );
      int Initialize( void );

      // Create / finish work
      ForkStatus NewJob( void );
      void WorkerDone( int exit_status = 0 );

      // # of worker stats
      void setMaxWorkers( int max_workers );
      int getNumWorkers( void ) { return workerList.Number(); };
      int getMaxwOrkers( void ) { return maxWorkers; };

      int DeleteAll( void );
      int KillAll( bool force );

  private:
      virtual int Reaper( int exitPid, int exitStatus );

  private:
      SimpleList<ForkWorker *>      workerList;
      int               maxWorkers;       // Max # of children
      int               reaperId;         // ID Of the child reaper
      bool              childExit;        // Am I an exiting child (don't kill things!!)
};

#endif // __FORKWORK_H__


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