Shulou(Shulou.com)06/03 Report--

Piecemeal knowledge.

1. The type of thread id--- process id is pid_t, and the type of thread id is pthread_t

Compare two thread id:

# include

Int pthread_equal (pthread_t tid1, pthread_t tid2)

Get your own thread id:

Pthread_t pthread_self (void)

two。 Thread creation

Int pthread_create (pthread_t * restrict tidp, const pthread_attr_t * restrict attr

Void * (* start_rtn) (void *), void * restrict arg)

Here is an example of the print thread id:

# include

# include

# include

# include

# include

# include

Pthread_t ntid

Void printids (const char * s) {

Pid_t pid

Pthread_t tid

Pid = getpid ()

Tid = pthread_self ()

Printf ("% s pid% u tid% u (0x%x)\ n", s, (unsigned int) pid

(unsigned int) tid, (unsigned int) tid)

}

Void * thr_fn (void * arg) {

Printids ("new thread:")

Return ((void*) 0)

}

Int main () {

Int err = 0

Err = pthread_create (& ntid, NULL, thr_fn, NULL)

/ / err = pthread_create (& ntid, NULL, thr_fn, NULL)

If (erratically ordered 0) {

Printf ("% s\ n", strerror (err))

}

Printids ("main thread:")

Sleep (1)

Exit (0)

}

Compiled with ubuntu,eclipse, prompts that pthread_create. The header file is defined, but there is no connection thread library. Eclipse needs to be set up. Select Project-Properties-c, c++build--settings---gcc c linker---libraries, and add the library pthread. Compile and run again. Ok .

Main thread: pid 2164 tid 3079145152 (0xb78806c0)

New thread: pid 2164 tid 3079142256 (0xb787fb70)

3. Thread termination

Void * thr_fn1 (void * arg) {

Printf ("thread 1 returning\ n")

Return ((void*) 1)

}

Void * thr_fn2 (void * arg) {

Printf ("thread 2 exiting\ n")

Pthread_exit ((void *) 1)

}

Int main () {

Int err

Pthread_t tid1, tid2

Void * tret

Err = pthread_create (& tid1, NULL, thr_fn1, NULL)

If (err! = 0) {

Printf ("can't create thread 1 err% s\ n", strerror (err))

}

Err = pthread_create (& tid2, NULL, thr_fn2, NULL)

If (erratically ordered 0) {

Printf ("can't create thread 2VR% s\ n", strerror (err))

}

Err = pthread_join (tid1, & tret)

If (erratically ordered 0) {

Printf ("can't join with thread 1 err% s\ n", strerror (err))

}

Printf ("thread 1 exit code% d\ n", (int) tret)

Err = pthread_join (tid2, & tret)

If (erratically ordered 0) {

Printf ("can't join eith thread 2VR% s\ n", strerror (err))

}

Printf ("thread 2 exit code% d\ n", (int) tret)

Exit (0)

}

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