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Use npxdrop in cpu_thread_exit to save some cycles.

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Clear FPU pcb flags for new upcall thread, these flags needn't
be inherited, the new thread should start from clean FPU status.
This commit is contained in:
David Xu 2003-10-19 00:57:10 +00:00
parent 93227805ff
commit d5e1f581ff
1 changed files with 3 additions and 1 deletions
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4
sys/i386/i386/vm_machdep.c
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@ -286,7 +286,8 @@ cpu_thread_exit(struct thread *td)
{
struct pcb *pcb = td->td_pcb;
#ifdef DEV_NPX
npxexit(td);
if (td == PCPU_GET(fpcurthread))
npxdrop();
#endif
if (pcb->pcb_flags & PCB_DBREGS) {
/* disable all hardware breakpoints */
@ -369,6 +370,7 @@ cpu_set_upcall(struct thread *td, struct thread *td0)
* more analysis) (need a good safe default).
*/
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
pcb2->pcb_flags &= ~(PCB_NPXTRAP|PCB_NPXINITDONE);
/*
* Create a new fresh stack for the new thread.