Web__pthread_spin_lock (pthread_spinlock_t *lock) 25 {26: int val = 0; 27: 28 /* We assume that the first try mostly will be successful, thus we use: 29: atomic_exchange if it is not implemented by a CAS loop (we also assume: 30: that atomic_exchange can be faster if it succeeds, see: 31: ATOMIC_EXCHANGE_USES_CAS). Otherwise, we use a weak CAS and ... WebCalling pthread_spin_lock() on a lock that is already held by the caller or a lock that has not been initialized with pthread_spin_init(3) results in undefined behavior. The …
Linux中的spinlock机制[五] - 死锁问题 - 知乎 - 知乎专栏
WebMar 22, 2024 · 2. You need to try to acquire the lock in all threads which are supposed to be mutually exclusive: void ppp () { pthread_spin_lock (&lock); char a = 'C'; while (1) write (1, &a, 1); } Context-switching isn’t prevented by the lock’s existence, you prevent threads from making progress simultaneously by having them try to acquire the same lock. Web1、函数原型. 用来获取（锁定）指定的自旋锁. 如果该自旋锁当前没有被其它线程所持有，则调用该函数的线程获得该自旋锁.否则该函数在获得自旋锁之前不会返回。. 1. int … bithgroup technologies baltimore md
pthread_spin_init(3) - Linux man page - die.net
WebPTHREAD_PROCESS_SHARED. 自旋锁可以由有权访问包含该锁的内存的任何进程中的任何线程操作 (即，该锁可以在多个进程之间共享的共享内存对象中)。. 在已经初始化的自旋锁 … WebCalling pthread_spin_lock() on a lock that is already held by the caller or a lock that has not been initialized with pthread_spin_init(3) results in undefined behavior. The pthread_spin_trylock () function is like pthread_spin_lock (), except that if the spin lock referred to by lock is currently locked, then, instead of spinning, the call ... WebSep 5, 2009 · In short, use of spin lock is correct if you garantee that your tasks will run on different CPU. Secondly, locking a mutex IS fast (as fast as spinlock) when is is unlocked. Mutexes locking (and unlocking) is slow (very slow) only if mutex is already locked. So, in your case, I suggest to use mutexes. Share. bithgroup technologies baltimore