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libthread: Lion context routines

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This commit is contained in:
Russ Cox 2011-10-13 23:57:54 -04:00
parent f1825251e7
commit 04e0a9bb81
6 changed files with 129 additions and 3 deletions
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32
src/libthread/Darwin-x86_64-swapcontext.c Normal file
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@ -0,0 +1,32 @@
#include "threadimpl.h"
void
makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
{
uintptr *sp;
va_list arg;
//fprint(2, "makecontext %d\n", argc);
if(argc != 2)
sysfatal("libthread: makecontext misused");
va_start(arg, argc);
uc->mc.di = va_arg(arg, uint);
uc->mc.si = va_arg(arg, uint);
//fprint(2, "%ux %ux\n", uc->mc.di, uc->mc.si);
va_end(arg);
sp = (uintptr*)((char*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size);
*--sp = 0; // fn's return address
*--sp = (uintptr)fn; // return address of setcontext
uc->mc.sp = (uintptr)sp;
}
int
swapcontext(ucontext_t *oucp, ucontext_t *ucp)
{
if(getcontext(oucp) == 0)
setcontext(ucp);
return 0;
}