Description:
All issues about multithreaded programming.
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implementing V() / signal()
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Why would this function need to do anything other than increment the semaphore? I can see why P() needs to decrement then wait -- but is there a need for V() to context switch on sem <= 0 etc? TIA
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Would this work on even one platform?
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Here is simple example: static char string[] = "XXXXX XXXXX"; static bool volatile done = false; static pthread_mutex_t mutex; void thread_1() { strcpy(string, "Hello World"); pthread_mutex_lock(&mutex); pthread_mutex_unlock(&mutex); done = true; ...void other_threads() { do { pthread_mutex_lock(&mutex);... more »
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my understanding of acquire/release/etc
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I find myself increasingly explaining to others my view of the memory model, CPU architecture, etc relating to lock free programming. I'm starting to think I better do a 'sanity check' before more people come asking. So here it is in (hopefully) a nutshell: I tend to give people a picture revolving around the CPU requesting... more »
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user-space RCU implementation in Relacy 2.0
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This code: [link] simulates a user-space RCU algorithm that is driven by a polling thread. Reader threads simply execute a synchronization operation on a episodic/periodic basis. Or, the reader threads can dynamically "opt-out" of the RCU polling process altogether. A reader thread would only do this... more »
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sem_post() and signals
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Hello, sem_post() is a signal safe function, which means that it's normally heavier to use than mutexes. However, I took a look to its implementation on Linux, and I don't see where is the actual cost. Below is the implementation on Linux, and there's nothing about signals here. Could anybody tell me if semaphore are really expensive ?... more »
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pthread_cond_wait segmentation fault
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I tried to make a producer of 'items' but my implementation crashes at pthread_cond_wait ... I really tried looking at everything and put print statements throughout my code, but there it just crashes. I did put the wait within a mutex. This code isn't complete, but the relevant parts are in there (I assume). Any idea what I did wrong?... more »
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