lock « semaphore « C Q&A

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C Q&A » semaphore » lock

1. Locking semaphores in C problem sys/sem stackoverflow.com

EDIT: This peace of code is pretty fine (so take it as example of semaphores ;). Bug in my program was in another place - found by my friend. ~~I have problem ...~~

2. Help with Semaphores/Locks bytes.com

To make it clear I am a student with a question and have read the Posting Guidelines, here is what I have written: It is contained within a file called synch.cc Lock::Lock(char* debugName) { name = debugName; lockHolder = NULL; // no thread yet holds lock Semaphore(name, 1); } Lock::~Lock() { delete lockHolder; } void Lock::Acquire() { IntStatus oldLevel = interrupt->SetLevel(IntOff); ...

3. reader/writer locks on shared mem using semaphores cboard.cprogramming.com

I think posting the actual problem will help Suppose we have a shared memory segment shared between 3 processes. Each of these processes keeps trying to write to the memory or read from it randomly. We are to allow only one writer at a time to prevent an inconsistent value from being written. Implement this using semaphore. Keep in mind that ...

4. how to check if semaphore is lock efficiently daniweb.com

void *thread_proxy_stub(void *arg) { int x; // wait untill the main thread will lock the first semaphore: while (1) { x = semctl ( sem1 , 0 , GETNCNT); // get the number of waiting threads. if (x == -1) exit(-1); // error - exit. if (x > 0) break; // if the main thread locked the first semaphore - break ...

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