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multithreading - Reader Writer Locks in C++ - Stack Overflow Greg Rogers pointed out that the POSIX standard does specify pthread_rwlock_* This doesn't help if you don't have pthreads , but it stirred my mind into remembering: Pthreads-w32 should work! Instead of porting this code to non- pthreads for your own use, just use Pthreads-w32 on Windows, and native pthreads everywhere else
When or why should I use a Mutex over an RwLock? RwLock requires T to be Send and Sync to be itself Sync In other words, Mutex is the only wrapper that can make a T syncable I found a good and intuitive explanation in reddit: Because of those bounds, RwLock requires its contents to be Sync, i e it's safe for two threads to have a ptr to that type at the same time
Understanding a thread safe RwLock lt;Arc lt;T gt; gt; mechanism in Rust The entire point of a RwLock is that modifications cannot be made while the object is locked for reading (i e the RwLockReadGuard returned from RwLock::read() is alive) So an Arc<RwLock<Config>> won't have your flags "randomly flipped" while a read lock is taken out (Granted, it can be an issue, if you release the lock and take it again, and
PThread RWLock Deadlocking with Recursive Locks pthread_rwlock supports recursive read locking, but not recursive write locking If you write lock the lock while you already hold it, you have entered the realm of undefined behavior This is the case for your thfn3() It's clearer if you call the threads the "reader" (thfn4) and the "writer" (thfn3) Case one is then:
go - How to use RWMutex? - Stack Overflow type Stat struct { counters map[string]*int64 countersLock sync RWMutex averages map[string]*int64 averagesLock sync RWMutex } It is called below func (s *Stat) Count(name
c - reader writer lock in pthread - Stack Overflow From the man pages of pthread_rwlock_wrlock, "The calling thread acquires the write lock if no other thread (reader or writer) holds the read-write lock rwlock Otherwise, the thread shall block until it can acquire the lock" So I was assuming that writer won't be blocked but this is not the case
RwLock deadlock and safety of the primitive - Stack Overflow A RwLock can offer better performance for many concurrent reads than a mutex by not blocking Even if a system specific policy is problematic, you will at least have the protection provided by the type system enforcing that a RwLock only be Sync if its contents are also Sync
Using pthread condition variable with rwlock - Stack Overflow No, you cannot use a rwlock when waiting on a conditional variable I cannot answer as to the "why", but that's the way POSIX has decided to do it Perhaps just to keep things simple You can still get the behavior you want, however, by making your own rwlock class by using only a mutex and 2 conditional variables without using a POSIX rwlock:
rust - flat_map on a Vec lt;RwLock lt;Vec lt;T gt; gt; gt; - Stack Overflow In general, using interior mutability primitives like RefCell, Mutex or RwLock cannot be hidden in API boundaries Sometimes, you can use methods like parking_lot's RwLockReadGuard::map() to explicitly mention the lock (like fn iter( self) -> MappedRwLockReadGuard<'_, impl Iterator< >> ), but not in your case, because flat_map() requires