Hi Cheng... > --------------------results---------------------------------------- > main posix tid:3086476976 > main pid: 14700 > main tid: 14700 > In the thread 0:posix tid 3086474144 > In the thread 0:pid 14700 > In the thread 0:tid 14701 > In the thread 1:posix tid 3075984288 > In the thread 1:pid 14700 > In the thread 1:tid 14702 I got similar result. "pid"s are same for all threads, tids are unique for each threads, and so is the posix tid. BTW, try this: $ LD_ASSUME_KERNEL=2.4.9 ./testku you will get something like below: main posix tid: 16384 main pid: 4657 main tid: 4657 In the thread 0:posix tid 16386 In the thread 0:pid 4659 In the thread 0:tid 4659 In the thread 1:posix tid 32771 In the thread 1:pid 4660 In the thread 1:tid 4660 Fun isn't it? :) suddenly POSIX tid now use smaller number. Also, since we disable NPTL here, "getpid" returns unique numbers too :) Furthermore, if you trace the code using strace, you will find out that pthread_self doesn't generate any syscall. Thus, my not-so-smart conclusion is, pthread is maintaining its own thread id table, and this id is probably correlated with each current->pid. To be sure, try to dig inside pthread source code. regards, Mulyadi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
