代码如下(5个人可以同时使两个人同时就餐，不知道编写的是否正确，求指导Thx！)：
//Code By Pnig0s1992
//Date:2012,3,7
#include <stdio.h>
#include <Windows.h>
#define N 5 //设置哲学家总人数
#define LEFT (i+N-1)%N
#define RIGHT (i+1)%N
#define THINKING 0
#define HUNGRY 1
#define EATING 2
#define MAX_SEM_COUNT 1 //设置最大信号量
HANDLE ghSemaphore;//声明信号量句柄数组
HANDLE SemPhliosopher[N]; //声明哲学家信号量数组
HANDLE aThread[N];//声明线程数组
int state[N];//声明哲学家状态记录数组
CRITICAL_SECTION cs;
VOID take_forks(int i);
VOID put_forks(int i);
VOID tryEat(int i);
VOID WINAPI PhilosopherProc(LPARAM lpParam)
{
INT PhilosopherNo = (INT)lpParam;
while(TRUE)
{
take_forks(PhilosopherNo);
put_forks(PhilosopherNo);
}
}
VOID take_forks(int i)
{
WaitForSingleObject(ghSemaphore,INFINITE);
state[i] = HUNGRY;
tryEat(i);
ReleaseSemaphore(ghSemaphore,MAX_SEM_COUNT,NULL);
WaitForSingleObject(SemPhliosopher[i],INFINITE);
}
VOID put_forks(int i)
{
WaitForSingleObject(ghSemaphore,INFINITE);
state[i] = THINKING;
printf("\n%d号哲学家开始思考.",i+1);
tryEat(LEFT);
tryEat(RIGHT);
ReleaseSemaphore(ghSemaphore,MAX_SEM_COUNT,NULL);
}
VOID tryEat(int i)
{
if(state[i] == HUNGRY && state[LEFT] != EATING && state
!= EATING)
{
state[i] == EATING;
printf("\n\n%d号哲学家正在吃饭.",i+1);
ReleaseSemaphore(SemPhliosopher[i],MAX_SEM_COUNT,NULL);
}
}
int main(int argc,char * argv[])
{
INT index = 0;
DWORD dwThreadID[N];
ghSemaphore = CreateSemaphore(NULL,MAX_SEM_COUNT,MAX_SEM_COUNT,TEXT("Sem"));
if(ghSemaphore == NULL)
{
printf("\n创建信号量失败,请检查。");
return -1;
}
for(index=0;index<N;index++)
{
SemPhliosopher[index] = CreateSemaphore(NULL,MAX_SEM_COUNT,MAX_SEM_COUNT,NULL);
if(SemPhliosopher[index] == NULL)
{
printf("\n错误:%d",GetLastError());
return -1;
}
}
for(index=0;index<N;index++)//为每个哲学家创建一个线程
{
aThread[index] = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)PhilosopherProc,(LPVOID)index,0,&dwThreadID[index]);
if(aThread[index] == NULL)
{
printf("\n错误:%d",GetLastError());
return -1;
}
}
WaitForMultipleObjects(N,aThread,TRUE,INFINITE);
CloseHandle(ghSemaphore);
for(index=0;index<N;index++)
{
CloseHandle(SemPhliosopher[index]);
CloseHandle(aThread[index]);
}
CloseHandle(ghSemaphore);
return 0;
}
[课程]Android-CTF解题方法汇总！
