Code Sea supplements: Linux multi-threaded mutex lock

　　Multithreading counts, with each thread accumulating 10 numbers.

Realize:

1#include <stdio.h>2#include <stdlib.h>3#include <string.h>4#include <errno.h>5#include <pthread.h>6 7 pthread_mutex_t Num_lock;8 9 intnum =0;Ten intsum =0; One  A void*foo1 () - { - #if1 thePthread_mutex_lock (&num_lock); -      for(inti =0;i<Ten;++i) -     { -num + =1; +Sum + =num; -printf"thread 1,num =%d,sum =%d\n", num,sum); +UsleepTen); A     } atPthread_mutex_unlock (&num_lock); - #else -      for(inti =0;i<Ten;++i) -     { -num + =1; -Sum + =num; inprintf"thread 1,num =%d,sum =%d\n", num,sum); -UsleepTen); to     } + #endif -     returnNULL; the } *  $ void*Foo2 ()Panax Notoginseng { - #if1 thePthread_mutex_lock (&num_lock); +      for(inti =0;i<Ten;++i) A     { thenum + =1; +Sum + =num; -printf"thread 2,num =%d,sum =%d\n", num,sum); $UsleepTen); $     } -Pthread_mutex_unlock (&num_lock); - #else the      for(inti =0;i<Ten;++i) -     {Wuyinum + =1; theSum + =num; -printf"thread 2,num =%d,sum =%d\n", num,sum); WuUsleepTen); -     } About #endif $     returnNULL; - } -  - intMainintargcChar*argv[]) A { + pthread_t Tid1,tid2; the     interr; -  $Pthread_mutex_init (&num_lock,null); the  theErr = Pthread_create (&tid1,null,foo1,null); the     if(Err! =0) the     { -printf"Error code:%d,reason:%s\n", Err,strerror (err)); in         return-1; the     } the  AboutErr = Pthread_create (&tid2,null,foo2,null); the     if(Err! =0) the     { theprintf"Error code:%d,reason:%s\n", Err,strerror (err)); +         return-1; -     } the Bayi     //for (int i = 0;i<10;++i) the     //printf ("main thread, num =%d\n", num++); the  -Err =Pthread_join (tid1,null); -     if(Err! =0) the     { theprintf"Error code:%d,reason:%s\n", Err,strerror (err)); the         return-1; the     } -Err =Pthread_join (tid2,null); the     if(Err! =0) the     { theprintf"Error code:%d,reason:%s\n", Err,strerror (err));94         return-1; the     } the  thePthread_mutex_destroy (&num_lock);98  About     return 0; -}

Code Sea supplements: Linux multi-threaded mutex lock