使用信号量编译但未运行的生产者-消费者代码

Question

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

Answer 1

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.