Semaphore headache

samguddy · 11-06-2009, 05:55 PM

Hey there. I have this project due in 3 days and I just cant seem to find the answer anywhere. I have to simulate the reader and writer problem. I do have the code but when it comes to the semaphore it does not seem that my IDE has the semaphore library file. Im using visual basic 2008. Can you guys plz help me. Also, the Professor asked that we use at switch statement to randomly choose threads to execute. I thought I got it but it does not work. Here is the code I have for switch statement with random number generator.

Code:

srand((unsigned)time(0)); 
int random_integer; 
int lowest=1, highest=2; 
int range=(highest-lowest)+1; 
	   
 for(int index=0; index<20; index++)
{ 
    random_integer = lowest+int(range*rand()/(RAND_MAX + 1.0)); 
	      
	switch (random_integer)
	{
		case 1  :  DWORD WINAPI READER1(LPVOID r);
				break;
		
		case  2 :	DWORD WINAPI WRITER1(LPVOID n);
				break;

abachler · 11-06-2009, 08:14 PM

1. this isn't a visual basic forum
2. that isn't visual basic
3. your code does nothing
4. there are missing brackets at the end
5. you are not creating threads merely declaring the thread functions
6. Read the homework policy

11-06-2009, 05:55 PM	#1
samguddy Registered User Join Date: Nov 2009 Posts: 2	Semaphore headache Hey there. I have this project due in 3 days and I just cant seem to find the answer anywhere. I have to simulate the reader and writer problem. I do have the code but when it comes to the semaphore it does not seem that my IDE has the semaphore library file. Im using visual basic 2008. Can you guys plz help me. Also, the Professor asked that we use at switch statement to randomly choose threads to execute. I thought I got it but it does not work. Here is the code I have for switch statement with random number generator. Code: srand((unsigned)time(0)); int random_integer; int lowest=1, highest=2; int range=(highest-lowest)+1; for(int index=0; index<20; index++) { random_integer = lowest+int(range*rand()/(RAND_MAX + 1.0)); switch (random_integer) { case 1 : DWORD WINAPI READER1(LPVOID r); break; case 2 : DWORD WINAPI WRITER1(LPVOID n); break;
samguddy is offline

11-06-2009, 08:14 PM	#2
abachler Rampaging 35 Stone Welsh Join Date: Apr 2007 Posts: 2,929	1. this isn't a visual basic forum 2. that isn't visual basic 3. your code does nothing 4. there are missing brackets at the end 5. you are not creating threads merely declaring the thread functions 6. Read the homework policy __________________ He is free, you say. Ah! That is his misfortune… These men… [have] the most terrible, the most imperious of masters, that is, need. … They must therefore find someone to hire them, or die of hunger. Is that to be free? - Simon Linguet
abachler is offline

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