网站权重如何提高,作品集设计,移动手机号码网站,免费建论坛我试图从Linux中的文件夹中读取所有文件和目录#xff0c;其线程为 获取最大文件大小当前目录和当前目录树下的名称。在线程应用程序(linux#xff0c;pthreads)中读取文件大小时出错主线程扫描基本目录查找文件#xff0c;当找到它的目录时#xff0c;会生成一个新线…我试图从Linux中的文件夹中读取所有文件和目录其线程为 获取最大文件大小当前目录和当前目录树下的名称。在线程应用程序(linuxpthreads)中读取文件大小时出错主线程扫描基本目录查找文件当找到它的目录时会生成一个新线程以生成继续扫描的线程。在这一点上线程加入直到最后创建的线程结束。 (我知道这不是最好的方法但它只是一个练习。)问题是它的程序返回错误的结果我不知道为什么。我有以下文件树来测试应用程序下树. (Debug folder under codelite project/workspace)├── [ 4096] dir1│ └── [ 9] arch-dir1.txt├── [ 4096] dir2│ ├── [ 27] arch-dir2.txt│ └── [ 29083] huge├── [ 29053] direxp├── [ 27048] direxp.o└── [ 68] direxp.o.d正如你可以看到当前目录下的最大文件大小是direxp(这个节目)最大文件大小是巨大的运行二进制文件我得到了以下结果dir: .dir: ..arch: direxp.o.dmax dir tree set to: direxp.o.d size: 68arch: direxp.omax file dir set to: direxp.o size: 27048arch: .darch: direxpmax file dir set to: direxp size: 29053dir: dir1th dir: .th dir: ..th arch: arch-dir1.txt thsize: 4096max tree file set to: arch-dir1.txt thsize: 4096dir: dir2th dir: .th dir: ..th arch: arch-dir2.txt thsize: 4096th arch: huge thsize: 4096Highest current directory file:direxp tam:29053 bytes.Highest tree file:arch-dir1.txt tam:4096 bytes.个前缀字符串显示在另一个线程处理的数据。我使用函数readdir(主线程)和readdir_r(衍生线程)来读取目录条目。我认为这可能是麻烦但后来编译程序调用readdir_r在所有线程下并且错误的结果仍然存在。我真的不明白为什么文件大小它返回错误的(4096它在我的文件系统默认的簇大小。那么为什么文件处理为目录能给我一个忙吗 感谢主要功能码#include #include #include #include #include #include #include #include #include using std::cout;using std::cin;using std::endl;#define MAX_PATH 255struct archivo{char nombre[MAX_PATH1];off_t tam;};// thread argsstruct thargs{char nextdir[MAX_PATH1]; // next dirvoid* (*pth)(void*); // pointer to thread functionarchivo* arch; // pointer to archivo};pthread_mutex_t lock PTHREAD_MUTEX_INITIALIZER;int main(int argc, char **argv){char target[MAX_PATH1] {0}; // directorio inicialarchivo grande_dir {{0}},grande_arbol {{0}};// No paramsif (argc 2){if (! getcwd(target,MAX_PATH)){perror(Error en path:);exit(-1);}}if (argc 2)strncpy(target,argv[1],MAX_PATH);if (argc 2){perror(Num params incorrecto);exit(-2);}DIR* midir NULL;// try to open target dirif (! (midir opendir(target))){perror(Error abriendo dir:);exit(-3);}dirent* direntry;//dirent* rentry1 NULL;struct stat estado {0}; // struct needed for desambiguationbool primera true; // control var to initialize the search// read current dir contents//while((readdir_r(midir,direntry,rentry1) 0) rentry1 )while((direntry readdir(midir))){stat(direntry-d_name,estado);// current entry its a fileif (direntry-d_type DT_REG){cout arch: direntry-d_name endl;// init search to find the highest fileif (primera){strncpy(grande_dir.nombre,direntry-d_name,MAX_PATH);grande_dir.tam estado.st_size;strncpy(grande_arbol.nombre,direntry-d_name,MAX_PATH);grande_arbol.tam estado.st_size;primera false;cout max dir tree set to: direntry-d_name size: estado.st_size endl;}// High file sizeif (estado.st_size grande_dir.tam){pthread_mutex_lock(lock);strncpy(grande_dir.nombre,direntry-d_name,MAX_PATH);grande_dir.tam estado.st_size;pthread_mutex_unlock(lock);cout max file dir set to: direntry-d_name size: estado.st_size endl;}}// current entry its a directoryif (direntry-d_type DT_DIR){cout dir: direntry-d_name endl;// check not . or .. dirif ((strcmp(direntry-d_name,.) ! 0) (strcmp(direntry-d_name,..) ! 0)){thargs args {{0}};pthread_t th1;pthread_mutex_lock(lock);sprintf(args.nextdir,%s/%s,target,direntry-d_name);args.arch grande_arbol;args.pth procesadir;pthread_mutex_unlock(lock);// new thread creationpthread_create(th1,NULL,procesadir,args);// main thread waits th1 completionpthread_join(th1, NULL);}}}closedir(midir);pthread_mutex_destroy(lock);cout endl Highest file in current directory file : endl grande_dir.nombre tam: grande_dir.tam bytes. endl;cout endl Highest file in tree: endl grande_arbol.nombre tam: grande_arbol.tam bytes. endl;return 0;}线程函数代码void* procesadir(void* args){thargs* myargs reinterpret_cast(args);DIR* thdir NULL;if ((thdir opendir(myargs-nextdir))){dirent thentry;dirent* rentry NULL;struct stat thstat {0};//while((thentry readdir(thdir)))while((readdir_r(thdir,thentry,rentry) 0) rentry ){stat(thentry.d_name,thstat);if (thentry.d_type DT_REG){cout th arch: thentry.d_name thsize: thstat.st_size endl;if (thstat.st_size myargs-arch-tam){pthread_mutex_lock(lock);memset(myargs-arch-nombre,0,MAX_PATH);strncpy(myargs-arch-nombre,thentry.d_name,MAX_PATH);myargs-arch-tam thstat.st_size;pthread_mutex_unlock(lock);cout max tree file set to: thentry.d_name thsize: thstat.st_size endl;}}if (thentry.d_type DT_DIR){if ((strcmp(thentry.d_name,.) ! 0) (strcmp(thentry.d_name,..) ! 0)){thargs largs {{0}};pthread_t th2;sprintf(largs.nextdir,%s/%s,myargs-nextdir,thentry.d_name);largs.arch myargs-arch;largs.pth myargs-pth;// thread creationpthread_create(th2,NULL,procesadir,args);// current thread waits th2 completionpthread_join(th2, NULL);}cout th dir: thentry.d_name endl;}}closedir(thdir);elseperror(Error abriendo dir en thread:);return 0;}2012-01-26ppk
