linux下使用线程锁互斥访问资源

linux使用线程锁访问互斥资源：

1、线程锁的创建

pthread_mutex_t g_Mutex;

2、完整代码如下

 #include <stdio.h>
 #include <string.h>
 #include <pthread.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 #include <signal.h>

 #define READ_TIME    20000
 #define WRITE_TIME    30000

 pthread_mutex_t g_Mutex;
 int g_iX = ;
 int g_rwok = ;

 bool bExit = false;

 void sig(int signal)
 {
     bExit = true;
 }

 /* writer pthread, write per 30000 us */
 void * writer(void * arg)
 {
     while()
     {
         if(true == bExit)
         {
             g_rwok++;
             break;
         }
         if(EBUSY != pthread_mutex_trylock(&g_Mutex))
         {
             printf("\033[0;32mwriter : lock, write begin\033[0m\n");
             g_iX = ;
             usleep(WRITE_TIME);
             pthread_mutex_unlock(&g_Mutex);
             printf("\033[0;32mwriter : write ok, unlock\033[0m\n");
         }
         else
         {
             printf("\033[0;32mwriter : \033[0;31mbusy , can not write\033[0m\n");
         }
         usleep(WRITE_TIME);
     }

     return NULL;
 }

 /* reader pthread, read per 20000 us */
 void * reader(void * arg)
 {
     while()
     {
         if(true == bExit)
         {
             g_rwok++;
             break;
         }
         if(EBUSY != pthread_mutex_trylock(&g_Mutex))
         {
             printf("\033[0;33mreader : lock\033[0m\n");
             g_iX = ;
             usleep(READ_TIME);
             pthread_mutex_unlock(&g_Mutex);
             printf("\033[0;33mreader : unlock , read ok\033[0m\n");
         }
         else
         {
             printf("\033[0;33mreader : \033[0;31mbusy , can not read\033[0m\n");
         }
         usleep(READ_TIME);
     }

     return NULL;
 }

 int main(int argc, char *argv[])
 {
     signal(SIGINT, sig);
     memset(&g_Mutex, sizeof(g_Mutex), );
     pthread_mutex_init(&g_Mutex, NULL);

     pthread_t preader, pwriter;
     pthread_create(&preader, NULL, reader, NULL);
     pthread_create(&pwriter, NULL, writer, NULL);
     while()
     {
         if(true == bExit &&  == g_rwok)
         {
             break;
         }
         usleep();
     }
     pthread_mutex_destroy(&g_Mutex);
     printf("\033[0;33mdestroy mutex\033[0m\n");

     return ;
 }

3、运行结果如下

reader : lock
writer : busy , can not write
reader : unlock , read ok
writer : lock, write begin
reader : busy , can not read
writer : write ok, unlock
reader : lock
reader : unlock , read ok
writer : lock, write begin
reader : busy , can not read
writer : write ok, unlock