Process and Threads - Operating Systems, Lecture Notes | CS 3204, Study notes of Operating Systems

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^ Process 1^ Process 2 User Space^ Process n-1^ Process n^ Operating System(kernel)

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^ int waitpid(pid, &status, options)
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int fds[2];retval

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Process 2 fd[0]

fd[1]

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int^ fds[2]; char s[100];retval = pipe(fds);pid^ =^

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if(pid != 0){ /* parent process /write(fds[1], “hello”, 6);} else^ { / child process */read(fds[0], s, 100);printf(“Read %s\n”, s);}

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^ $gcc –o firstthread firstthread.c-lpthread

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^ =pthread_create

pthread_create(thread,attr,routine,arg)
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void *PrintHello(void *threadid){ printf("%d: Hello World!\n", threadid);pthread_exit(NULL);}
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