13.1 Multi-threaded operation shared memory, producer consumer model, multi-threaded server framework

The producer consumer model is as follows:

The procedure is as follows:

1#include <unistd.h>2#include <sys/types.h>3 4#include <stdlib.h>5#include <stdio.h>6#include <errno.h>7#include <string.h>8 9#include <pthread.h>Ten  One intG_count =0; A  - intNnum, Nloop; -  the //Defining Locks -pthread_mutex_t Mutex =Pthread_mutex_initializer; -  - //define conditions and initialize +pthread_cond_t my_condition=Pthread_cond_initializer; -  + #defineCustom_count 2 A #defineProduct_count 4 at  -  -   //int Pthread_mutex_lock (pthread_mutex_t *mutex); -   //int Pthread_mutex_trylock (pthread_mutex_t *mutex); -    //int Pthread_mutex_unlock (pthread_mutex_t *mutex); -  in /* - int pthread_cond_timedwait (pthread_cond_t *restrict cond, to pthread_mutex_t *restrict Mutex, + const struct TIMESPEC *restrict abstime); - int pthread_cond_wait (pthread_cond_t *restrict cond, the pthread_mutex_t *restrict mutex); *               */ $ Panax Notoginseng //POSIX line Libraries's function line libraries - void*consume (void*Arg) the { +      A     intInum =0; theInum = (int) arg; +      while(1) -     { $Pthread_mutex_lock (&mutex); $printf"consum:%d\n", inum); -          while(G_count = =0)//while waking up need to re-judge whether the condition G_count is satisfied, if not satisfied, wait again -         { theprintf"consum:%d started to wait \ n", inum); -Pthread_cond_wait (&my_condition, &mutex);//API has done three things//pthread_cond_wait false AwakeWuyiprintf"consum:%d woke up \ n", inum); the         } -      Wuprintf"consum:%d Consumer Products begin\n", inum); -g_count--;//Consumer Products Aboutprintf"consum:%d Consumer Products end\n", inum); $          -Pthread_mutex_unlock (&mutex); -      -Sleep1); A     } +  thePthread_exit (0); -  $ }  the  the //Producer Threads the // the void*produce (void*Arg) - { in     intInum =0; theInum = (int) arg; the      About      while(1) the     { the      the     /* + //Because it is a lot of producers call produce, to protect the global variable g_count, so locking - Pthread_mutex_lock (&mutex); the if (G_count >)Bayi         { the printf ("produce:%d products too much, need control, hibernate \ n", inum); the Pthread_mutex_unlock (&mutex); - sleep (1); - continue; the         } the Else the         { the Pthread_mutex_unlock (&mutex); -         } the         */ the      thePthread_mutex_lock (&mutex);94printf"Product Quantity:%d\n", g_count); theprintf"produce:%d Production Products begin\n", inum); theg_count++; the         //as long as I produce a product, I tell consumers to spend98printf"produce:%d Production Products end\n", inum); About          -printf"produce:%d conditions Signal begin\n", inum);101Pthread_cond_signal (&my_condition);//notifications, threads waiting on a condition102printf"produce:%d conditions Signal end\n", inum);103         104Pthread_mutex_unlock (&mutex); theSleep1);106     }107     108Pthread_exit (0);109  the } 111  the //Conclusion: The results of return ARG and pthread_exit () can be used to get pthread_join.113 intMain () the { the     inti =0; thepthread_t tidarray[custom_count+product_count+Ten];117     118     //Create a consumer thread119      for(i=0; i<custom_count; i++) -     {121Pthread_create (&tidarray[i], NULL, consume, (void*) (i);122     }123     124Sleep1); the     //Create a line process126      for(i=0; i<product_count; i++)127     { -Pthread_create (&tidarray[i+custom_count], NULL, Produce, (void*) (i);129     } the     131      the     133      for(i=0; i<custom_count+product_count; i++)134     {135Pthread_join (Tidarray[i], NULL);//wait for thread to end ... 136     }137     138     139printf"The process has to end 1233\n"); $     141     return 0;142}

The results of the implementation are as follows:

13.1 Multi-threaded operation shared memory, producer consumer model, multi-threaded server framework