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1 #include "threadimpl.h"3 void4 makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)5 {6 int n;7 int *sp;9 sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;10 sp -= argc;11 /*12 * Stack pointer at call instruction (before return address13 * gets pushed) must be 16-byte aligned.14 */15 if((uintptr)sp%4)16 abort();17 while((uintptr)sp%16)18 sp--;19 memmove(sp, &argc+1, argc*sizeof(int));20 *--sp = 0; /* return address */21 ucp->uc_mcontext.mc_eip = (long)func;22 ucp->uc_mcontext.mc_esp = (int)sp;23 }25 int26 swapcontext(ucontext_t *oucp, ucontext_t *ucp)27 {28 if(getcontext(oucp) == 0)29 setcontext(ucp);30 return 0;31 }