PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, PTHREAD_RWLOCK_DEFAULT_NP =PTHREAD_RWLOCK_PREFER_READER_NP }; 可是直接pthread_rwlockattr_setkind_np(&attr,PTHREAD_RWLOCK_PREFER_WRITER_NP); 没用!为啥呢?连man页都没有,所以我思疑这个函数没实现,因而就用debuginfo-install glibc? 装glibc的调试符号,然后用...
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,//写者优先 PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP//读者优先 }; 1 /* 获取与设置属性 */intpthread_rwlockattr_getkind_np(constpthread_rwlockattr_t * attr,int* pref);intpthread_rwlockattr_setkind_np(pthread_rwlockattr_t * attr...
PTHREAD_RWLOCK_PREFER_READER_NP, //读者优先 PTHREAD_RWLOCK_PREFER_WRITER_NP, //很唬人, 但是也是读者优先 PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, //写者优先 PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP 读者优先:读锁来请求可以立即响应,只要有一个读锁没完成,那么写锁就无法写。
为了控制写线程饥饿,必须要在创建读写锁的时候设置PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE,不要用PTHREAD_RWLOCK_PREFER_WRITER_NP啊,这个似乎没什么用,感觉应该是个bug,不要问我是怎么知道的。。。 /// /usr/include/pthread.h /* Read-write lock types. */ #if defined ...
为了控制写线程饥饿,必须要在创建读写锁的时候设置PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE,不要用PTHREAD_RWLOCK_PREFER_WRITER_NP啊,这个似乎没什么用,感觉应该是个bug,不要问我是怎么知道的。。。 /// /usr/include/pthread.h /* Read-write lock types. */ #if defined...
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP); pthread_mutex_init(&heap->lock, &attr); pthread_mutexattr_destroy(&attr);pthread_rwlockattr_init(&rwattr); pthread_rwlockattr_setkind_np(&rwattr, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP); ...
PTHREAD_MUTEX_ADAPTIVE_NP #ifdef __USE_UNIX98 , PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP, PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL ...
|| mutex->attr == __PTHREAD_RECURSIVE_MUTEXATTR)mutex->attr = malloc (sizeof *attr); //pthread_mutex_destroy释放的就是这里的资源 if (! mutex->attr)return ENOMEM;*mutex->attr = *attr;return 0;} 但是业界有另一种说法是：早年的POSIX只支持在static变量上使用PTHREAD_MUTEX_INITIALIZER，所...
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP Setting the lock kind to this avoids writer starvation as long as any read locking is not done in a recursive fashion. Thepthread_rwlockattr_getkind_np() function returns the value of the lock kind attribute of the read-write lock attribute object...
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, PTHREAD_PROCESS_PRIVATE } #endif /* Values for attributes. */ enum { PTHREAD_CREATE_JOINABLE, #define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_DETACHED #define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED ...