UNIX Environment Advanced Programming 11.5 thread termination

THREADS/EXITSTATUS.C 11-2#include "apue.h" #include <pthread.h>void* thr_fn1 (void* Arg) {printf ("Thread 1 retur    Ning\n "); /* Return a variable of type void* return a pointer who points to a variable of type void*/return ((void*) 10);}    void* thr_fn2 (void* Arg) {printf ("Thread 2 exiting\n"); Pthread_exit ((void *) 21);}     /* p is a pointer to a pointer b b points to an vaviable with type void */void test2 (void** p) {/* void* Tret;     void** p = &tret; *p is equal to variable tret tret = ' n ' test2 successfully-Modify the vaviable of Tret just like Tret = (     void*) ' n '; In outside of this function Tret are treated as a variable of type char so the compiler treate the memory of &t RET as a variable of char and the content (of course one byte) is the ASC code of CHAR ' n ' */*p = (void*) ' n ';    Don ' t think too much, this is just a type conversion}int main (void) {int err;    pthread_t Tid1;    pthread_t Tid2; Void* Tret;    /* Define a pointer to void*/err = pthread_create (&AMP;TID1, NULL, THR_FN1, NULL);    if (err! = 0) err_quit ("Can ' t create thread 1:%s\n", strerror (err));    Err = pthread_create (&tid2, NULL, THR_FN2, NULL);    if (err! = 0) err_quit ("Can ' t create thread 2:%s\n", strerror (err));    /* Pass an address of a vaviable, could change the value of the it*/err = Pthread_join (TID1, &tret);    if (err! = 0) err_quit ("can ' t join with thread 1:%s\n", strerror (err)); /* Force a variable with type void* to int force a pointer to an int */printf ("Thread 1 exit Code%d\n", (    int) (long) tret);    Err = Pthread_join (Tid2, &tret);    if (err! = 0) err_quit ("can ' t join with thread 2:%s\n", strerror (err));    printf ("Thread 2 exit Code%d\n", (int) (long) tret);    Test2 (&tret); printf ("%c\n", (char) (long) tret); Treat Tret as a variable of type char//Just like the following int A = 10;    int* pp = &a; *PP = (int) ' n ';    Just like a = (int) ' n ' printf ("%c \ n", (char) a); return 0;}

threads/badexit2.c 11-3#include "apue.h" #include <pthread.h>struct foo {int A;    int b;    int C; int D;};    void Printfoo (const char *s, const struct Foo *fp) {printf (s);    printf ("Structure at 0x%x\n", (unsigned int) (long) FP);    printf ("FOO.A =%d\n", fp->a);    printf ("FOO.B =%d\n", fp->b);    printf ("foo.c =%d\n", fp->c); printf ("FOO.D =%d\n", fp->d);}    void * THR_FN1 (void *arg) {struct Foo foo = {1, 2, 3, 4};    Printfoo ("Thread 1:\n", &foo); Pthread_exit (void *) &foo);    void * THR_FN2 (void *arg) {printf ("Thread 2:id is%d\n", (int) pthread_self ()); Pthread_exit ((void *) 0);}    int main (void) {int err;    pthread_t Tid1;    pthread_t Tid2;    struct foo* fp;    Err = pthread_create (&AMP;TID1, NULL, THR_FN1, NULL);    if (err! = 0) err_quit ("Can ' t create thread 1:%s\n", strerror (err));    Err = Pthread_join (Tid1, (void*) &AMP;FP);    Err = Pthread_join (Tid1, (void**) &AMP;FP); if (err! = 0) Err_quit ("Can ' t join with thread 1:%s\n ", strerror (err));    Sleep (1);    printf ("Parent starting second thread\n");    Err = pthread_create (&tid2, NULL, THR_FN2, NULL);    if (err! = 0) err_quit ("Can ' t create thread 2:%s\n", strerror (err));    Sleep (1);    Printfoo ("parent:\n", FP); Exit (0);}

UNIX Environment Advanced Programming 11.5 thread termination