Linux 帮助手册安装不全
今天在新安装的 fedora 17 虚拟机上写多线程程序的时候，本想查看下系统帮助手册中关于线程相关函数的说明，结果。。。
[tom@localhost thread]$ man pthread_createNo manual entry for pthread_create
为啥呢？
在以下网页上找到了答案：http://blog.163.com/yungang_z/blog/static/1751531332011103103529810/
于是操作如下（安装手册）：
[tom@localhost thread]$ yum install man-pages -yLoaded plugins: langpacks, presto, refresh-packagekitYou need to be root to perform this command.[tom@localhost thread]$ sudo yum install man-pages -yLoaded plugins: langpacks, presto, refresh-packagekitExisting lock /var/run/yum.pid: another copy is running as pid 6661.Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 26 M RSS (431 MB VSZ) Started: Sun Dec 16 17:57:33 2012 - 00:32 ago State : Sleeping, pid: 6661 从上面红色部分可以看到，由于 yum 锁被另一个名为 PackageKit 的进程占用，因此本安装没法继续进行，于是查出那个进程，然后 kill 掉：
[tom@localhost ~]$ ps -ef | grep packageroot 6656 1 0 17:57 ? 00:00:00 /usr/libexec/packagekitdtom 6744 6686 0 17:59 pts/0 00:00:00 grep --color=auto package[tom@localhost ~]$ kill 6656[tom@localhost ~]$ sudo kill 6656[sudo] password for tom: [tom@localhost ~]$ ps -ef | grep packagetom 6780 6686 0 18:01 pts/0 00:00:00 grep --color=auto package
一旦该进程被 kill 成功之后，手册安装就能成功进行了：
Resolving Dependencies--> Running transaction check---> Package man-pages.noarch 0:3.35-4.fc17 will be installed--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================================= Package Arch Version Repository Size=============================================================================================================================================================Installing: man-pages noarch 3.35-4.fc17 updates 4.9 M
Transaction Summary=============================================================================================================================================================Install 1 Package
Total download size: 4.9 MInstalled size: 4.4 MDownloading Packages:http://mirrors.ustc.edu.cn/fedora/linux/updates/17/x86_64/man-pages-3.35-4.fc17.noarch.rpm: [Errno 12] Timeout onhttp://mirrors.ustc.edu.cn/fedora/linux/updates/17/x86_64/man-pages-3.35-4.fc17.noarch.rpm: (28, '')Trying other mirror.man-pages-3.35-4.fc17.noarch.rpm | 4.9 MB 00:41 Running Transaction CheckRunning Transaction TestTransaction Test SucceededRunning Transaction Installing : man-pages-3.35-4.fc17.noarch 1/1 Verifying : man-pages-3.35-4.fc17.noarch 1/1
Installed: man-pages.noarch 0:3.35-4.fc17
Complete!

再查一下相关函数的帮助，就 ok 了：
[tom@localhost thread]$ man pthread_createPTHREAD_CREATE(3) Linux Programmer's Manual PTHREAD_CREATE(3)
NAME pthread_create - create a new thread
SYNOPSIS #include <pthread.h>
int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
Compile and link with -pthread.
DESCRIPTION The pthread_create() function starts a new thread in the calling process. The new thread starts execution by invoking start_routine(); arg is passed as the sole argument of start_routine().