futex-based pthread_cond】的更多相关文章

pthread_cond的实现使用了几个futex来协同进行同步,以及如何来实现的. 假定你已经明白 futex,futex-requeue,以及 pthread lowlevellock. <linux 内核的futex> <linux 内核的futex - requeue 以及 requeue-pi> <pthread的lowlevellock> pthread_cond一共使用了4个futex,其中包括1个外部的futex,是它所从属的Mutex. pthread…
futex是linux内核为用户空间实现锁等同步机制而设计的同步排队(队列queueing)服务.在futex.c的注释中,futex起源于"Fast Userspace Mutex",但它并非只是一个Mutex,而是用户空间线程(pthread)同步机制的底层服务.它的基本设计有三点,1.同步对象可以在进程之使用,并且保证同步对象的内部状态访问有序,2.当同步对象没有竞争的情况下,可以在用户空间快速完成(fastpath),3.当同步对象发生竞争时,必须进入内核使用futex系统提供…
futex为更好支持pthread_cond的实现(,最主要是broadcast),设计了requeue功能,并以futex系统调用提供操作接口,包括一对配对的操作 futex_wait_requeue_pi 以及 futex_requeue. mutex互斥体,确保临界区之间互斥(mutual exclusion),但不能满足不同临界区之间的前驱后继的关系,所以可以通过在临界区A使用condition variable条件变量,等待另一临界区B的发出信号指令. Condition Variab…
pthread_cond的实现使用了几个futex来协同进行同步,以及如何来实现的. 假定你已经明白 futex,futex-requeue,以及 pthread lowlevellock. <linux 内核的futex> <linux 内核的futex - requeue 以及 requeue-pi> <pthread的lowlevellock> pthread_cond一共使用了4个futex,其中包括1个外部的futex,是它所从属的Mutex. pthread…
The algorithm for supporting distributed MVCC based cross-row transactions on top of a distributed key-value database with single-row transaction support. https://gist.github.com/weidagang/1b001d0e55c4eff15ad34cc469fafb84…
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