ctmutex.cpp

来自「这是c++编程方面的名著的例子代码」· C++ 代码 · 共 89 行

#include <string.h>
#include "ctmutex.h"
#include <iostream.h>


mutex::mutex(void)
{
    if(DosCreateMutexSem(NULL,&Mutex,0,0)){
       SemException.message("Could Not Create Mutex");
       throw SemException;
    }
     Duration = SEM_INDEFINITE_WAIT;
}


mutex::~mutex(void)
{
    if(DosCloseMutexSem(Mutex)){
       SemException.message("Could Not Destroy Mutex");
       throw SemException;
    }
}



void mutex::lock(void)
{
      DosRequestMutexSem(Mutex,Duration);
}


void mutex::unlock(void)
{
    DosReleaseMutexSem(Mutex);
}


named_mutex::named_mutex(void)
{
   if(DosCreateMutexSem(NULL,&Mutex,0,0)){
       SemException.message("Could Not Create Mutex");
       throw SemException;
    }
    Duration = SEM_INDEFINITE_WAIT;
}

named_mutex::named_mutex(char *MName,int Owned)
{

    strcpy(MutexName,MName);
    InitiallyOwned = Owned;
    if(DosCreateMutexSem(MName,&Mutex,0,InitiallyOwned)){
       SemException.message("Could Not Create Mutex");
       throw SemException;
    }
    Duration = SEM_INDEFINITE_WAIT;
}


named_mutex::named_mutex(string MName)
{

 unsigned long RC;
 strcpy(MutexName,MName.c_str());
    InitiallyOwned = 0;
    Mutex = (HMTX)NULL;
    RC = DosOpenMutexSem(MutexName,&Mutex);
    if(RC){
       cout << RC << endl;
       SemException.message("Could Not open Mutex");
       throw SemException;
    }
    Duration = SEM_INDEFINITE_WAIT;
}
unsigned long named_mutex::lockDuration(void)
{
    return(Duration);
}

void named_mutex::lockDuration(unsigned long Dur)
{
    Duration = Dur;
}