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1 #include "../threadimpl.h"2 #undef exits5 ucontext_t c0, c1;6 char stack[65536];8 void9 go(void *v)10 {11 print("hello, world\n");12 setcontext(&c0);13 }15 void16 main(void)17 {18 // print("in main\n");19 getcontext(&c1);20 c1.uc_stack.ss_sp = stack;21 c1.uc_stack.ss_size = sizeof stack;22 makecontext(&c1, go, 1, 0);23 if(getcontext(&c0) == 0)24 setcontext(&c1);25 print("back in main\n");26 exits(0);27 }