1.多线程的程序很多不是为了提高效率，充分利用多 CPU，而是为了逻辑描述方便。
2.纤程往往可以提供更加便捷的描述，因为它只能通过 SwitchToFiber 显式切换，这样可以少许多加解锁的过程。而且切换的效率也比真正的线程来的高
刚接触到fiber这个名词，很不错的东西，将异步化为同步，减少逻辑复杂度
实现代码
#include <ucontext.h>
#define FIBER_STACK 1024*64
ucontext_t child, parent;
void threadFunction()
{
printf("333 Child fiber yielding to parent\n");
swapcontext(&child, &parent);
printf("555 Child thread exiting\n");
swapcontext(&child, &parent);
}
int main()
{
getcontext(&child);
child.uc_link = 0;
child.uc_stack.ss_sp = malloc(FIBER_STACK);
child.uc_stack.ss_size = FIBER_STACK;
child.uc_stack.ss_flags = 0;
if (child.uc_stack.ss_sp == 0)
{
perror("malloc: Could not allocate stack");
exit(1);
}
printf("111 Creating child fiber\n");
makecontext(&child, &threadFunction, 0);
printf("222 Switching to child fiber\n");
swapcontext(&parent, &child);
printf("444 Switching to child fiber again\n");
swapcontext(&parent, &child);
free(child.uc_stack.ss_sp);
printf("666 Child fiber returned and stack freed\n");
return 0;
}
参考
http://blog.csdn.net/cyberlabs/article/details/6920138
