int
__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
{
struct rv rv = __getcontext (oucp);
if (rv.first_return)
__setcontext (ucp);
return 0;
}
int
__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
{
extern void __swapcontext_ret (void);
/* Save the current machine context to oucp. */
__getcontext (oucp);
/* Modify oucp to skip the __setcontext call on reactivation. */
oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret;
oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4;
/* Restore the machine context in ucp. */
__setcontext (ucp, 1);
return 0;
}
int
__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
{
/* Save the current machine context to oucp. */
__getcontext (oucp);
/* mark sc_sar flag to skip the setcontext call on reactivation. */
if (oucp->uc_mcontext.sc_sar == 0) {
oucp->uc_mcontext.sc_sar++;
/* Restore the machine context in ucp. */
__setcontext (ucp);
}
return 0;
}
