linux c++(线程 & 读写锁)

读写锁

• 读写锁的特点： 读共享，写独占，写优先级高
• 读写锁仍然是一把锁，有不同的状态:
  • 未加锁
  • 读锁
  • 写锁

读写锁的使用场景：适合读的线程多

常用 pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
#include <pthread.h>
//销毁
int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);
//初始化
int pthread_rwlock_init(pthread_rwlock_t *restrict rwlock,const pthread_rwlockattr_t *restrict attr);
//销毁
int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);
//加读锁
int pthread_rwlock_rdlock(pthread_rwlock_t *rwlock);
//加写锁
int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock);
//释放锁
int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);