A producer-consumer code using semaphore compiling but not running
i am in a very sticky situation as i am unable to figure out the problem with my producer-consumer problem using pthreads. the code compiles but when i run the code nothing happens and the expected output does not show. i believe there is a probelem in my producer and consumer threads with the if/else statement but i may be something else. the code is as shown below:
To compile it on command line:
gcc -pthread -lrt semaphore.c -o semaphore
Once you run the program it dosent display the correct output
c compilation pthreads semaphore producer-consumer
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
add a comment |
i am in a very sticky situation as i am unable to figure out the problem with my producer-consumer problem using pthreads. the code compiles but when i run the code nothing happens and the expected output does not show. i believe there is a probelem in my producer and consumer threads with the if/else statement but i may be something else. the code is as shown below:
To compile it on command line:
gcc -pthread -lrt semaphore.c -o semaphore
Once you run the program it dosent display the correct output
c compilation pthreads semaphore producer-consumer
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
2
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
you might want to check the return value frompthread_create.
– bruceg
Nov 16 '18 at 1:41
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14
add a comment |
i am in a very sticky situation as i am unable to figure out the problem with my producer-consumer problem using pthreads. the code compiles but when i run the code nothing happens and the expected output does not show. i believe there is a probelem in my producer and consumer threads with the if/else statement but i may be something else. the code is as shown below:
To compile it on command line:
gcc -pthread -lrt semaphore.c -o semaphore
Once you run the program it dosent display the correct output
c compilation pthreads semaphore producer-consumer
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
i am in a very sticky situation as i am unable to figure out the problem with my producer-consumer problem using pthreads. the code compiles but when i run the code nothing happens and the expected output does not show. i believe there is a probelem in my producer and consumer threads with the if/else statement but i may be something else. the code is as shown below:
To compile it on command line:
gcc -pthread -lrt semaphore.c -o semaphore
Once you run the program it dosent display the correct output
c compilation pthreads semaphore producer-consumer
c compilation pthreads semaphore producer-consumer
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
edited Nov 16 '18 at 19:36
preetyyyyyy
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
asked Nov 16 '18 at 0:45
preetyyyyyypreetyyyyyy
11
11
2
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
you might want to check the return value frompthread_create.
– bruceg
Nov 16 '18 at 1:41
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14
add a comment |
2
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
you might want to check the return value frompthread_create.
– bruceg
Nov 16 '18 at 1:41
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14
2
2
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
you might want to check the return value from
pthread_create.– bruceg
Nov 16 '18 at 1:41
you might want to check the return value from
pthread_create.– bruceg
Nov 16 '18 at 1:41
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14
add a comment |
1 Answer
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You might want to consider some sample output to go with it; but I noticed that your producer and consumer threads start by:
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);
Simply removing this from both threads made your program work. On my edition of linux, RAND_MAX is 2^31, so these could cause an up to 21 second sleep in each thread.
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You might want to consider some sample output to go with it; but I noticed that your producer and consumer threads start by:
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);
Simply removing this from both threads made your program work. On my edition of linux, RAND_MAX is 2^31, so these could cause an up to 21 second sleep in each thread.
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
add a comment |
You might want to consider some sample output to go with it; but I noticed that your producer and consumer threads start by:
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);
Simply removing this from both threads made your program work. On my edition of linux, RAND_MAX is 2^31, so these could cause an up to 21 second sleep in each thread.
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
add a comment |
You might want to consider some sample output to go with it; but I noticed that your producer and consumer threads start by:
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);
Simply removing this from both threads made your program work. On my edition of linux, RAND_MAX is 2^31, so these could cause an up to 21 second sleep in each thread.
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
You might want to consider some sample output to go with it; but I noticed that your producer and consumer threads start by:
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);
Simply removing this from both threads made your program work. On my edition of linux, RAND_MAX is 2^31, so these could cause an up to 21 second sleep in each thread.
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
answered Nov 16 '18 at 2:50
mevetsmevets
2,385918
2,385918
add a comment |
add a comment |
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2
This seems like a good time to learn how to debug your programs.
– Some programmer dude
Nov 16 '18 at 0:51
you might want to check the return value from
pthread_create.– bruceg
Nov 16 '18 at 1:41
The minimum would be to put some print statements in key places, and run it, so we can see where it went...
– benc
Nov 16 '18 at 2:14