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Fix unsafe use of ptsignal() in mi_switch().
ptsignal() has to be called with the kernel lock held. As ensuring the locking in mi_switch() is not easy, and deferring the signaling using the task API is not possible because of lock order issues in mi_switch(), move the CPU time checking into a periodic timer where the kernel can be locked without issues. With this change, each process has a dedicated resource check timer. The timer gets activated only when a CPU time limit is set. Because the checking is not done as frequently as before, some precision is lost. Use of timers adapted from FreeBSD. OK tedu@ Reported-by: firstname.lastname@example.org
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