fork()函数调用后为什么总是子进程先运行呢

gtkmm

随机 != 不确定

enrique_yu

出于copy on write的考虑，linux主观上是希望子进程能先运行，但是实际的调用顺序并不能得到保证。引用LKD上的一段话：
Back in do_fork(), if copy_process() returns successfully, the new child is woken up and run. Deliberately, the kernel runs the child process first[9]. In the common case of the child simply calling exec() immediately, this eliminates any copy-on-write overhead that would occur if the parent ran first and began writing to the address space.

[9] Amusingly, this does not currently function correctly, although the goal is for the child to run first.

wangjingyu00711

回复 5# drangon

cow具体是什么啊。
   

wangjingyu00711

http://autumnice.blog.163.com/blog/static/555200201010265035695/   copy-on-write部分介绍