Hi! > Instructions > ------------ > senduipi <index> - send a user IPI to a target task based on the UITT index. > > clui - Mask user interrupts by clearing UIF (User Interrupt Flag). > > stui - Unmask user interrupts by setting UIF. > > testui - Test current value of UIF. > > uiret - return from a user interrupt handler. Are other CPU vendors allowed to implement compatible instructions? If not, we should probably have VDSO entries so kernel can abstract differences between CPUs. > Untrusted processes > ------------------- > The current implementation expects only trusted and cooperating processes to > communicate using user interrupts. Coordination is expected between processes > for a connection teardown. In situations where coordination doesn't happen > (say, due to abrupt process exit), the kernel would end up keeping shared > resources (like UPID) allocated to avoid faults. Keeping resources allocated after process exit is a no-no. Best regards, Pavel -- http://www.livejournal.com/~pavelmachek
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