我一直在試圖調試我的代碼,只要我有一天半的空閒時間,我不知道我的代碼有什麼問題。當我將close()
函數添加到遞歸調用時,該程序會給我一個無效的指針。但是,當我刪除close()
函數調用的程序運行正常,但它不會做什麼是應該做的,這就是:在C中調試遞歸線程調用
- 在用戶 輸入目錄
- 開放加起來所有的文件大小子目錄,如果有的話,並添加 子目錄
而是裏面 的所有文件,它增加了所有的文件大小輸入目錄能夠打開最後一個子目錄,將該目錄內的文件添加到總文件大小計數中。
我想用線程做到這一點。 main()
函數從用戶輸入目錄創建一個主線程,並在球杆上運行opendirectory()
。
/*
* Iterates through given directory
*/
void *opendirectory(void *t)
{
pthread_mutex_lock(&dirlock);
DIR *dpntr;
struct dirent *dentry;
char new_directory[512], dir = t;
printf("OPENING DIRECTORY ... %s\n", t);
/* Checks if given directory can be opened */
if((dpntr = opendir(t)) == NULL) {
printf("DIRECTORY FAILED ...%s\n",t);
perror("ERROR -- COULD NOT OPEN DIR");
pthread_exit(NULL);
}
printf("DIRECTORY OPENED: %s\n", t);
/* Read each file in current directory */
while ((dentry = readdir(dpntr)) != NULL) {
/* Ignore special directories */
if(strcmp(dentry -> d_name, ".") == 0 || strcmp(dentry -> d_name, "..") == 0) {
continue;
} else {
compilelist(t, dentry->d_name);
}
}
pthread_mutex_unlock(&dirlock);
/* Checks if directory can be closed */
if(closedir(dpntr) < 0)
printf("ERROR CLOSING %s.\n", t);
}
這是確定是否應該創建新線程並且應該遞歸運行的函數。
/*
* Determines if current file is a directory
* Creates a new thread if true
*/
void compilelist (const char* dirname, const char *filename)
{
pthread_mutex_lock(&filelock);
struct stat statdata;
char *filepathname, *dpntr;
/* Allocate memory for filepathname */
if((filepathname = (char *) malloc(sizeof(char) * strlen(dirname))) == NULL)
{
printf("CANNOT ALLOCATE MEMORY FOR FILE PATH NAME.");
pthread_exit(NULL);
}
/* Concats directory name with file name */
if(dirname[strlen(dirname) -1] == '/')
{
pthread_mutex_lock(&pathlock);
sprintf(filepathname, "%s%s", dirname, filename);
pthread_mutex_unlock(&pathlock);
}else
{
pthread_mutex_lock(&pathlock);
sprintf(filepathname, "%s/%s", dirname, filename);
pthread_mutex_unlock(&pathlock);
}
lstat(filepathname, &statdata);
/* Calls print_statdata() if current item is a file */
if(!(S_ISDIR(statdata.st_mode)))
{
printf("FILE: %s\n", filepathname);
if(!stat(filepathname, &statdata))
{
print_statdata(filename, &statdata);
}
else {
fprintf (stderr, "GETTING STAT FOR %s", filepathname);
perror("ERROR IN STATDATA WHILE GETTING STAT");
}
}
/* Recursive call to opendirectory() */
else {
pthread_mutex_lock(&dircountlock);
dirCount++;
pthread_mutex_unlock(&dircountlock);
dpntr = filepathname;
free(filepathname);
printf("SUB-DIRECTORY THREAD: %s\nTHREAD ID NUMBER: %d\n", dpntr, dirCount);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_create(&threads[dirCount-1], &attr, opendirectory, (void *)dpntr);
}
pthread_mutex_unlock(&filelock);
}
這裏是main()
/*
* Main function prompts user for a directory
*/
int main(int argc, char *argv[])
{
int i;
char *dPtr;
// pthread_attr_t attr;
printf("ENTER A DIRECTORY:\n\t");
scanf("%s", directory);
dPtr = directory;
/* Initialize mutex and condition variable objects */
pthread_mutex_init(&mutex, NULL);
pthread_mutex_init(&filelock, NULL);
pthread_mutex_init(&dirlock, NULL);
pthread_mutex_init(&dircountlock, NULL);
pthread_cond_init (&count_threshold_cv, NULL);
/* For portability, explicitly create threads in a joinable state */
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_create(&threads[0], &attr, opendirectory, (void *)dPtr);
/* Wait for all threads to complete */
for (i = 0; i < dirCount; i++) {
pthread_join(threads[i], NULL);
}
printf("TOTAL DIRECTORY SIZE: %d\n", dirSize);
/* Clean up and exit */
pthread_attr_destroy(&attr);
pthread_mutex_destroy(&mutex);
pthread_mutex_destroy(&filelock);
pthread_mutex_destroy(&dirlock);
pthread_mutex_destroy(&dircountlock);
pthread_cond_destroy(&count_threshold_cv);
pthread_exit (NULL);
}
而且全局變量...
pthread_mutex_t mutex;
pthread_mutex_t dirlock;
pthread_mutex_t filelock;
pthread_mutex_t dircountlock;
pthread_mutex_t threadlock;
pthread_cond_t count_threshold_cv;
pthread_attr_t attr;
pthread_t threads[128]; // handles up to 128 threads (i.e. 128 directories, change accordingly)
char directory[512];
int dirSize = 0;
int dirCount = 1; // user's input directory
我覺得所謂的compilelist()
功能的底部pthread_create()
工作不正常。線程[]指的是默認大小爲20的全局線程數組,假設總共不會超過20個目錄。由於用戶的輸入目錄,dirCount從1開始,並在遇到新目錄時增加。
whoah,很多代碼... – stefanB 2009-11-17 01:48:14
如果你想得到這個幫助,你將不得不提供整個源代碼(dPtr在哪裏聲明?dir = t是錯誤的,等等......) – Gonzalo 2009-11-17 01:58:12
你能將代碼發佈到main()?或者至少你在設置線程屬性/處理連接/ etc? – 2009-11-17 01:58:38