在C中实现互斥的问题
我正在实施一个程序来读取包含房间名称，连接和房间类型的文件名。例如：
ROOM NAME: chicago
CONNECTION 1: sarasota
CONNECTION 2: columbus
CONNECTION 3: miami
CONNECTION 4: boston
ROOM TYPE: END_ROOM
该程序旨在向用户显示他们正在开始的房间，询问用户的输入，检查输入是终端房间还是其他连接。如果是另一个连接，则会再次显示提示。如果用户到达终端房间，则游戏结束。但是，我需要实现一个互斥锁，如果用户输入＆＃34; time＆＃34;，则会创建一个文件，将时间写入其中，并显示在屏幕上。之后，再次为用户显示提示。当删除互斥锁实现时，我的代码工作正常。这是我在代码中使用互斥锁时所看到的内容。我似乎达到时间功能，程序似乎识别不正确的房间，但当一个＆＃34;正确＆＃34;房间进入光标只是返回，什么都不做。有关为什么我只在互斥实现上获得此行为的任何线索？
该程序如下，您是否看到任何可能导致此问题的内容？
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <fcntl.h>
//Read in the room data
//Perform the stat() function on the rooms directory in the same directory
//and open the file with the most recent st_mtime component of the returned stat struct
#define NUM_USED_ROOMS 7
char usedRooms[NUM_USED_ROOMS][256];
char roomFilePath[75];
char timeFilePath[75];
char* connections[NUM_USED_ROOMS];
int end = 0;
char input[20];
int numberOfSteps = -1;
char *steps[75];
int file_descriptor;
char timeText[100];
pthread_mutex_t myMutex = PTHREAD_MUTEX_INITIALIZER;
void * getTime() {
pthread_mutex_lock(&myMutex);
printf("You asked for the time!\n");
pthread_mutex_unlock(&myMutex);
return NULL;
}
//Check if the room number passed is the end
void isEnd(int roomNumber, char *dirName){
//Counting the number of steps for the end of the program
numberOfSteps++;
steps[numberOfSteps - 1] = usedRooms[roomNumber];
//Getting the name of the proper file
sprintf(roomFilePath, "%s/%s", dirName, usedRooms[roomNumber]);
char substring[20];
int numLine = 1;
FILE * filePointer;
filePointer = fopen(roomFilePath, "r");
int lines = 0;
char buffer[256];
while(fgets(buffer, sizeof(buffer), filePointer) != NULL){
lines = lines + 1;
}
fclose(filePointer);
//Opening the file to read to see if it is the end. If it is, assign end = 1.
filePointer = fopen(roomFilePath, "r");
while(fgets(buffer, sizeof(buffer), filePointer) != NULL) {
if (numLine == lines)
{
strcpy(substring, buffer+11);
}
numLine = numLine + 1;
}
if(strstr(substring, "END" ) != NULL) {
end = 1;
}
}
//Get the user input
void getInput() {
fflush(stdin);
scanf("%s", input);
fflush(stdin);
fflush(stdout);
}
void readFile(char *dirName){
DIR *dir;
struct dirent *ent;
int i = 0;
if ((dir = opendir (dirName)) != NULL) {
/* print all the files and directories within directory */
while ((ent = readdir (dir)) != NULL) {
if (strncmp(ent->d_name,".",sizeof(ent->d_name)) == 0 ||
strncmp(ent->d_name,"..",sizeof(ent->d_name)) == 0 )
{
} else {
strcpy(usedRooms[i],ent->d_name);
i++;
}
}
closedir (dir);
} else {
/* could not open directory */
perror ("");
}
}
void playGame(int roomNumber, char * dirName){
int i;
printf("usedRooms is %s", usedRooms[roomNumber]);
pthread_mutex_lock(&myMutex);
pthread_t secondThread;
pthread_create(&secondThread, NULL, getTime,NULL);
//Check if the user guessed the end room
if(end == 1) {
fflush(stdout);
return;
}
else{
isEnd(roomNumber, dirName);
if (end == 1)
{
fflush(stdout);
return;
}
}
int move = 1;
while(move == 1) {
//Open the file of the path of the room passed in
sprintf(roomFilePath, "%s/%s", dirName, usedRooms[roomNumber]);
FILE * filePointer;
filePointer = fopen(roomFilePath, "r");
int fileLines = 0;
char line[256];
//Count the lines in the file so I know how to traverse it
while(fgets(line, sizeof line, filePointer) != NULL) {
fileLines = fileLines + 1;
}
fclose(filePointer);
filePointer = fopen(roomFilePath, "r");
int currentLine = 0;
//Create the array for the rooms that can be navigated to
char gameRooms[6][30];
while(fgets(line, sizeof line, filePointer) != NULL) {
char *pos;
if((pos = strchr(line, '\n')) != NULL)
{
*pos = '\0';
}
//Print out the current room
if (currentLine == 0)
{
char substring[20];
strcpy(substring, line+11);
printf("CURRENT LOCATION: %s\n", substring);
}
//Print the first connection from this room
else if (currentLine == 1){
printf("POSSIBLE CONNECTIONS: ");
fflush(stdout);
char substring[20];
strcpy(substring, line+14);
printf("%s", substring);
fflush(stdout);
strcpy(gameRooms[currentLine - 1], substring);
}
//Print the rest of the connections, comma separated
else if (currentLine > 1 && currentLine < fileLines - 1) {
printf(",");
fflush(stdout);
char substring[20];
strcpy(substring, line+14);
printf("%s", substring);
fflush(stdout);
strcpy(gameRooms[currentLine - 1], substring);
//gameRooms[currentLine - 1] = substring;
}
else {
printf(".");
fflush(stdout);
}
currentLine = currentLine + 1;
}
fclose(filePointer);
printf("\nWHERE TO?>");
//Get the user input
getInput();
if(strcmp("time", input) == 0){
pthread_mutex_unlock(&myMutex);
pthread_join(secondThread, NULL);
pthread_mutex_lock(&myMutex);
pthread_create(&secondThread, NULL, getTime, NULL);
}
//Loop through the file to see if the input matches a room name in the array
for(i = 0; i < fileLines - 2; i++) {
if (strcmp(gameRooms[i], input) == 0)
{
int j;
for(j = 0; j < NUM_USED_ROOMS; j++) {
//If there is a match, play the game starting at the room entered
if(strcmp(usedRooms[j], input) == 0) {
printf("THE STRINGS MATCH usedRooms is %s "
"and input is %s\n",usedRooms[j],input);
playGame(j,dirName);
}
}
move = 0;
}
}
//If the user's input didn't match the list of rooms
if (move == 1) {
printf("\nHUH? I DON'T UNDERSTAND THAT ROOM. TRY AGAIN. \n\n");
fflush(stdout);
fflush(stdin);
}
}
}
int main() {
int newestDirTime = -1; // Modified timestamp of newest subdir examined
char targetDirPrefix[32] = "walterer.rooms."; // Prefix we're looking for
char newestDirName[256]; // Holds the name of the newest dir that contains prefix
memset(newestDirName, '\0', sizeof(newestDirName));
DIR* dirToCheck; // Holds the directory we're starting in
struct dirent *fileInDir; // Holds the current subdir of the starting dir
struct stat dirAttributes; // Holds information we've gained about subdir
dirToCheck = opendir("."); // Open up the directory this program was run in
if (dirToCheck > 0) // Make sure the current directory could be opened
{
while ((fileInDir = readdir(dirToCheck)) != NULL) // Check each entry in dir
{
if (strstr(fileInDir->d_name, targetDirPrefix) != NULL) // If entry has prefix
{
//printf("Found the prefex: %s\n", fileInDir->d_name);
stat(fileInDir->d_name, &dirAttributes); // Get attributes of the entry
if ((int)dirAttributes.st_mtime > newestDirTime) // If this time is bigger
{
newestDirTime = (int)dirAttributes.st_mtime;
memset(newestDirName, '\0', sizeof(newestDirName));
strcpy(newestDirName, fileInDir->d_name);
}
}
}
}
closedir(dirToCheck);
//Read the file at the specified directory
readFile(newestDirName);
int start;
int i;
for (i = 0; i < NUM_USED_ROOMS; i++)
{
memset(roomFilePath, '\0', sizeof(roomFilePath));
sprintf(roomFilePath,"%s/%s", newestDirName, usedRooms[i]);
char output[256];
memset(output, '\0', sizeof(output));
char* token;
char* connectRoom;
FILE *filePointer;
filePointer = fopen(roomFilePath,"r");
//Find the starting room and pass that into the playGame function
if (filePointer == NULL)
{
printf("Unable to open file!\n");
} else {
while(!feof(filePointer)) {
fgets(output, 256, filePointer);
token = strtok(output, "\n");
if(strstr(token, "START") != NULL){
start = i;
}
}
fclose(filePointer);
}
}
//Play the game with the starting room at the directory name
playGame(start, newestDirName);
printf("YOU HAVE FOUND THE END ROOM. CONGRATULATIONS!\n");
printf("YOU TOOK %d STEPS. YOUR PATH TO VICTORY WAS: \n", numberOfSteps);
for(i = 0; i < numberOfSteps; i++){
printf("%s\n", steps[i]);
}
return 0;
}
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