[問題] 請問pthread_create為何會產生process

看板C_and_CPP (C/C++)作者mingtai1 (綠豆嘉義人)時間12年前 (2013/06/27 14:48)推噓0(0推 0噓 2→)

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開發平台(Platform): (Ex: VC++, GCC, Linux, ...) gcc 3.4.6, RED HAT LINUX 3.4.6-11 請問一下, 之前學的觀念是所有thread應該屬於同一個process, 但我CentOS下用pthread_create測試開2條thread, 卻多跑出了3個process 用ps aux|grep ptest看跑出了下面訊息 root 18569 0.0 0.0 24572 824 pts/2 S+ 14:42 0:00 ./ptest root 18570 0.0 0.0 24572 824 pts/2 S+ 14:42 0:00 ./ptest root 18571 0.0 0.0 24572 824 pts/2 S+ 14:42 0:00 ./ptest root 18572 0.0 0.0 24572 824 pts/2 S+ 14:42 0:00 ./ptest 請問有人知道這個原理是什麼嗎?為什麼會跑出這麼多process... 有沒有大大可以解惑一下, 感謝... @@ 程式碼如下: #include <unistd.h> /* Symbolic Constants */ #include <sys/types.h> /* Primitive System Data Types */ #include <errno.h> /* Errors */ #include <stdio.h> /* Input/Output */ #include <stdlib.h> /* General Utilities */ #include <pthread.h> /* POSIX Threads */ #include <string.h> /* String handling */ void* print_message_function ( void *ptr ); typedef struct str_thdata { int thread_no; char message[100]; } thdata; int main() { pthread_t thread1, thread2; thdata data1, data2; data1.thread_no = 1; strcpy(data1.message, "Hello!"); data2.thread_no = 2; strcpy(data2.message, "Hi!"); pthread_create (&thread1, NULL, print_message_function, (void *)&data1); pthread_create (&thread2, NULL, print_message_function, (void *)&data2); pthread_join(thread1, NULL); pthread_join(thread2, NULL); } void* print_message_function ( void *ptr ) { thdata *data; data = (thdata *) ptr; while(1) { printf("Thread %d says %s \n", data->thread_no, data->message); usleep(1); } return NULL; } -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.163.12.151