讀者寫著問題

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讀者優先

//讀者寫者問題-讀者優先#include<stdio.h>#include<process.h>#include<windows.h>using namespace std;HANDLE rmutex,wmutex;int Readcount=0;int read_num=10,write_num=5;DWORD WINAPI read(LPVOID lpParam){        WaitForSingleObject(rmutex,INFINITE);        if(Readcount==0)        {            WaitForSingleObject(wmutex,INFINITE);            printf("讀者 %s-------------------------對wmutex已加鎖\n",lpParam);        }        Readcount++;        ReleaseMutex(rmutex);        printf("讀者 %s 開始讀操作\n",lpParam);        for(int i=0;i<5;i++)        {            Sleep(1);            printf("讀者 %s 正在讀\n");        }        printf("讀者 %s 讀操作完畢\n",lpParam);        WaitForSingleObject(rmutex,INFINITE);        Readcount--;        if(Readcount==0)        {            ReleaseMutex(wmutex);            printf("讀者 %s-------------------------對wmutex已解鎖\n",lpParam);        }        ReleaseMutex(rmutex);        printf("讀者 %s ******死亡\n",lpParam);        //Sleep(10000);        while(true)        {            Sleep(100);            if(Readcount==0)            {                ReleaseMutex(wmutex);                break;            }        }        Sleep(10000);}DWORD WINAPI write(LPVOID lpParam){        WaitForSingleObject(wmutex,INFINITE);        printf("寫者 %s-------------------------對wmutex已加鎖\n",lpParam);        printf("寫者 %s 開始寫操作\n",lpParam);        for(int i=0;i<5;i++)        {            Sleep(1);            printf("寫者　%s 正在寫\n");        }        printf("寫者 %s 寫操作完畢\n",lpParam);        ReleaseMutex(wmutex);        printf("寫者 %s-------------------------對wmutext已解鎖\n",lpParam);        printf("寫者 %s ******死亡\n");        Sleep(10000);}int main(){    rmutex=CreateMutex(NULL,false,NULL);    wmutex=CreateMutex(NULL,false,NULL);    char *r[10]={"a","b","c","d","e","f","g","h","i","j"};    char *w[5]={"a","b","c","d","e"};    for(int i=0;i<read_num;i++)    {        printf("讀者 %s 建立並申請讀\n",r[i]);        CreateThread(NULL,0,read,r[i],0,NULL);        if(i>=5)        {            printf("寫者 %s 建立並申請寫\n",w[i-5]);            CreateThread(NULL,0,write,w[i-5],0,NULL);        }    }    Sleep(10000);    return 0;}

寫者優先

//讀者寫者問題-寫者優先#include<stdio.h>#include<windows.h>using namespace std;HANDLE rmutex,wmutex,rwmutex;int Readcount=0;int read_num=10,write_num=5;DWORD WINAPI read(LPVOID lpParam){    WaitForSingleObject(rwmutex,INFINITE);    ReleaseMutex(rwmutex);    WaitForSingleObject(rmutex,INFINITE);    if(Readcount==0)    {        WaitForSingleObject(wmutex,INFINITE);        printf("讀者 %s-------------------------對wmutex已加鎖\n",lpParam);    }    Readcount++;    ReleaseMutex(rmutex);    //read操作    printf("讀者 %s 開始讀操作\n",lpParam);    for(int i=0; i<5; i++)    {        Sleep(1);        printf("讀者 %s 正在讀\n");    }    printf("讀者 %s 讀操作完畢\n",lpParam);    WaitForSingleObject(rmutex,INFINITE);    Readcount--;    if(Readcount==0)    {        ReleaseMutex(wmutex);        printf("讀者 %s-------------------------對wmutex已解鎖\n",lpParam);    }    ReleaseMutex(rmutex);    printf("讀者 %s ******死亡\n",lpParam);    while(true)    {        Sleep(100);        if(Readcount==0)        {            ReleaseMutex(wmutex);            break;        }    }    Sleep(10000);}DWORD WINAPI write(LPVOID lpParam){    WaitForSingleObject(rwmutex,INFINITE);    WaitForSingleObject(wmutex,INFINITE);    printf("寫者 %s-------------------------對wmutex已加鎖\n",lpParam);    printf("寫者 %s 開始寫操作\n",lpParam);    for(int i=0; i<5; i++)    {        Sleep(1);        printf("寫者　%s 正在寫\n");    }    printf("寫者 %s 寫操作完畢\n",lpParam);    ReleaseMutex(wmutex);    printf("寫者 %s-------------------------對wmutext已解鎖\n",lpParam);    printf("寫者 %s ******死亡\n");    ReleaseMutex(rwmutex);    Sleep(10000);}int main(){    rmutex=CreateMutex(NULL,false,NULL);    wmutex=CreateMutex(NULL,false,NULL);    rwmutex=CreateMutex(NULL,false,NULL);    char *r[10]= {"a","b","c","d","e","f","g","h","i","j"};    char *w[5]= {"a","b","c","d","e"};    for(int i=0; i<read_num; i++)    {        printf("讀者 %s 建立並申請讀\n",r[i]);        CreateThread(NULL,0,read,r[i],0,NULL);        if(i>=5)        {            printf("寫者 %s 建立並申請寫\n",w[i-5]);            CreateThread(NULL,0,write,w[i-5],0,NULL);        }    }    Sleep(10000);    return 0;}