大家好，又见面了，我是你们的朋友全栈君
国内几乎没啥说的，公司很多网站很多还不让上，用手机谷歌还可能会被领导批评，寻思回家查，还强制加班下班还很晚，这是又要马儿跑又要马儿不吃草啊。 源码中这块是这么写的
代码语言：javascript复制 #define FUTEX_PRIVATE_FLAG 128
#define FUTEX_CMD_MASK ~FUTEX_PRIVATE_FLAG
#define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
#define FUTEX_REQUEUE_PRIVATE (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG)
#define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_OP_PRIVATE (FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG)
#define FUTEX_LOCK_PI_PRIVATE (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_PI_PRIVATE (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG)具体的FUTEX_PRIVATE_FLAG作用用man2来查， https://lwn.net/Articles/229668/ 公司的电脑不能访问这个网站，我就把内容贴出来，应该不算侵权吧 Hi all
I’m pleased to present this patch which improves linux futexes performance and scalability, merely avoiding taking mmap_sem rwlock.
Ulrich agreed with the API and said glibc work could start as soon
as he gets a Fedora kernel with it
