Reader / Writer 동기화

원문 : Stanford iTunesU Programming Paradigm 16강

버퍼에서 Read 전에 Write 금지.
Write 되지 않은 버퍼 Read 하지 않기.

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print?

01	char buffer[8];

02	Semaphore emptyBuffers(8);

03	Semaphore fullBuffers(0);

04

05	int main()

06

{

07	ThreadNew("Writer", Writer, 0);

08	ThreadNew("Reader", Reader, 0);

09	RunAllThread();

10

}

11

12	void Writer()

13

{

14	for (int i=0; i < 40; ++i)

15

{

16	char c = PrepareRandomChar();

17	SemaphoreWait(emptyBuffers);

18	buffer[ i%f ] = c;

19	SemaphoreSignal(fullBuffers);

20

}

21

}

22

23	void Reader()

24

{

25	for (int i=0; i < 40; ++i)

26

{

27	SemaphoreWait(fullBuffers);

28	char c = buffer[ i%f ];

29	ProcessChar(c);

30	SemaphoreSignal(emptyBuffers);

31

}

32

}