unix/SysThread.hpp

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/******************************************************************************/
/* REXX Kernel                                              SysThread.hpp     */
/*                                                                            */
/* Abstract system thread class.  This is just a template class, which no     */
/* virtual functions defined.  This gives the implementing platform a lot of  */
/* implementation flexibility to use inline methods where appropriate,        */
/* particularly for functions that are NOPs.  The platform is also free to    */
/* define any internal data necessary to implement the thread functions.      */
/*                                                                            */
/******************************************************************************/
 
#ifndef Included_SysThread
#define Included_SysThread
 
#include <pthread.h>
#include "rexx.h"
 
 
class SysThread {
 
public:
 
    typedef enum
    {
        LOW_PRIORITY,
        MEDIUM_PRIORITY,
        GUARDED_PRIORITY,
        HIGH_PRIORITY
    } ThreadPriority;
 
    enum
    {
        THREAD_STACK_SIZE = 1024*96
    };
 
    SysThread() : attached(false), _threadID(0) { ; }
    virtual ~SysThread() { ; }
 
    SysThread(pthread_t tID)
    {
        _threadID = (pthread_t)tID;
    }
 
    virtual void attachThread();
    void setPriority(int priority);
    virtual void dispatch();
    char *getStackBase();
    void terminate();
    void startup();
    void shutdown();
    void yield();
    inline uintptr_t threadID() {
         return (uintptr_t)_threadID;
    }
    bool equals(SysThread &other);
    inline size_t hash() { return (((size_t)_threadID) >> 8) * 37; }
 
 
protected:
    void createThread();
 
    bool           attached;        // indicates whether this was a created thread or attached
    pthread_t     _threadID;        // thread identifier
};
 
#endif