广东工业大学操作系统实验源码

#include

#define false 0
#define true 1
int sourse = 3;
int process = 5;
int all_process[3] = {10 5 7};
int max_process[5][3] = {{7 5 3} {3 2 2} {9 0 2} {2 2 2} {4 3 3}};
int have_process[5][3] = {{0 1 0} {2 0 0} {3 0 2} {2 1 1} {0 0 2}};
int need_process[5][3];
int available_process[3];
int request_process[3];

getNeed（） {
	for（int i = 0; i < process; i++） {
		for（int j = 0; j < sourse; j++） {
			need_process[i][j] = max_process[i][j] - have_process[i][j];
		}
	}
}

getAvailable（） {
	int temp = 0;
	for（int i = 0; i < sourse; i++） {
		temp = 0;
		for（int j = 0; j < process; j++） {
			temp += have_process[j][i];
		}
		available_process[i] = all_process[i] - temp;
	}
}

showProcess（int a[5][3]） {

	printf（“	资源0	资源1	资源2
“）;
	for（int i = 0; i < process; i++） {
		printf（“进程p%d:“ i）;
		for（int j = 0; j < sourse; j++） {	
			printf（“	 %d “ a[i][j]）;
		}
		printf（“
“）;
	}
	
}

showAllProcess（int a[3]） {
	printf（“[“）;
	for（int i = 0; i < 3; i++） {
		printf（“ %d “ a[i]）;
	}
	printf（“]
“）;
}

distribute（int k） {
	for（int i = 0; i < sourse; i++） {
		available_process[i] = available_process[i] - request_process[i];
		have_process[k][i] = have_process[k][i] + request_process[i];
		need_process[k][i] = need_process[k][i] - request_process[i];
	}
}


back（int k） {
	for（int i = 0; i < sourse; i++） {
		available_process[i] = available_process[i] + available_process[i];
		have_process[k][i] = have_process[k][i] - request_process[i];
		need_process[k][i] = need_process[k][i] + request_process[i];
	}
}

int isExist（） {

		
	int temp = 0;
	int flag = 1;
	
	int index[5] = {0 0 0 0 0};
	int k = 5;
	
	
	while（k > 0） {
		
		temp = 0;
		
		for（int i = 0; i < 5; i++） {
			
			if（index[i] == 1） {
				continue;
			}
			
			flag = 1;

			for（int j = 0; j < 3; j++） {
				if（available_process[j] >= need_process[i][j]） {
					continue;
				} else {
					flag = -1;
					break;
				}
			}
			
			if（flag == 1） {
				for（int k = 0; k < 3; k++） {
					available_process[k] += have_process[i][k];	
				}
				index[i] = 1;
			}
		}
		
		
		k--;
	}

	
	
	for（int i = 0; i < 5; i++） {
		if（index[i] == 1） {
			
			continue;
		}else {
			printf（“不存在安全序列
“）;
			return -1;
		}
		
	}
	printf（“存在安全序列
“）;
	return 1;

}
int bank（int num_process） {
	int index = 1;
	int result;
	char input;
	
	int available_process_test[3];
	
	for（int i = 0; i < 3; i++） {
		if（available_process[i] < request_process[i]） {
			index = -1;
			break;
		} else if（request_process[i] > need_process[num_process][i]） {
			index = -2;
			break;
		}
	} 
	if（index == -1） {
		printf（“要求资源大于可用资源。
“）;
	} else if（index == -2） {
		printf（“要求资源大于进程所需资源。
“）;
	}else {
		
		distribute（num_process）;
				
		result = isExist（）;
		
		if（result == 1） {
			printf（“分配资源成功！
“）;
		} else if（result == -1） {
		
		}				
	}
	
}

int main

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