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    "抢占模式与合作模式\n",
    "=============================="
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    ".Net中，托管线程分为抢占模式和合作模式；区分这两种模式，主要是为了GC的实现。  \n",
    "\n",
    "处于合作模式的线程可以自由地访问托管堆上的对象；处理抢占模式的线程则不能访问托管堆上的对象，如果需要访问则必须等待GC结束并切换到合作模式。因为托管代码随时需要访问托管堆，所以托管代码必须在合作模式下运行，而非托管代码则没有这个限制。进入抢占模式后，托管代码暂停执行而非托管代码可以继续做与.Net对象无关的处理。  \n",
    "\n",
    "模式切换分为主动切换和被动切换"
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    "GC安全点"
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