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39 lines
662 B
C
39 lines
662 B
C
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#include "threadimpl.h"
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void
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makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
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{
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int *sp;
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sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
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sp -= argc;
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memmove(sp, &argc+1, argc*sizeof(int));
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*--sp = 0; /* return address */
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ucp->uc_mcontext.mc_eip = (long)func;
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ucp->uc_mcontext.mc_esp = (int)sp;
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}
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extern int getmcontext(mcontext_t*);
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extern int setmcontext(mcontext_t*);
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int
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getcontext(ucontext_t *uc)
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{
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return getmcontext(&uc->uc_mcontext);
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}
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void
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setcontext(ucontext_t *uc)
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{
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setmcontext(&uc->uc_mcontext);
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}
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int
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swapcontext(ucontext_t *oucp, ucontext_t *ucp)
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{
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if(getcontext(oucp) == 0)
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setcontext(ucp);
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return 0;
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}
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