線程默認共享數據段、代碼段等地址空間，常用的是全局變量。而進程不共享全局變量，只能借助mmap。

//代碼示例

#include <string.h> #include <stdio.h> #include <pthread.h> #include <stdlib.h> #include <string.h> #include <unistd.h>int var = 100;void *tfn(void *arg) {var = 200;printf("In thread, the var is %d.\n",var);return NULL; }int main(void) {pthread_t tid;int ret;printf("In main, the var is %d at first.\n",var);ret = pthread_create(&tid, NULL, tfn, NULL);if( ret != 0 ) //出錯判斷{fprintf(stderr,"pthread_create error: %s\n",strerror(ret));exit(1);}sleep(1);printf("In main, the var is %d after thread's ending.\n",var);return 0; }

[root@localhost 01_pthread_test]# ./pthrd_crt

In main, the var is 100 at first.

In thread, the var is 200.

In main, the var is 200 after thread's ending.

總結

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