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* timer: add timer_mod_anticipate and timer_mod_anticipate_nsPaolo Bonzini2013-10-171-0/+26
| | | | | | | | | These let a user anticipate the deadline of a timer, atomically with other sites that call the function. This helps avoiding complicated lock hierarchies. Reviewed-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* timer: make qemu_clock_enable sync between disable and timer's cbLiu Ping Fan2013-10-171-0/+6
| | | | | | | | | | | | | After disabling the QemuClock, we should make sure that no QemuTimers are still in flight. To implement that with light overhead, we resort to QemuEvent. The caller of disabling will wait on QemuEvent of each timerlist. Note, qemu_clock_enable(foo,false) can _not_ be called from timer's cb. Also, the callers of qemu_clock_enable() should be protected by the BQL. Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* timer: protect timers_state's clock with seqlockLiu Ping Fan2013-10-171-0/+2
| | | | | | | | | | | | | | | QEMU_CLOCK_VIRTUAL may be read outside BQL. This will make its foundation, i.e. cpu_clock_offset exposed to race condition. Using private lock to protect it. After this patch, reading QEMU_CLOCK_VIRTUAL is thread safe unless use_icount is true, in which case the existing callers still rely on the BQL. Lock rule: private lock innermost, ie BQL->"this lock" Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safeStefan Hajnoczi2013-09-181-0/+17
| | | | | | | | | | | | | | | Introduce QEMUTimerList->active_timers_lock to protect the linked list of active timers. This allows qemu_timer_mod_ns() to be called from any thread. Note that vm_clock is not thread-safe and its use of qemu_clock_has_timers() works fine today but is also not thread-safe. The purpose of this patch is to eventually let device models set or cancel timers from a vcpu thread without holding the global mutex. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove legacy interfaceAlex Bligh2013-08-221-212/+2Star
| | | | | | | | | Remove the legacy interface from include/qemu/timers.h. Ensure struct QEMUClock is not exposed at all. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove main_loop_timerlistAlex Bligh2013-08-221-5/+1Star
| | | | | | | | | | Now we have timerlistgroups implemented and main_loop_tlg, we no longer need the concept of a default timer list associated with each clock. Remove it and simplify initialisation of clocks and timer lists. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rearrange timer.h & make legacy functions call non-legacyAlex Bligh2013-08-221-273/+341
| | | | | | | | | | | Rearrange timer.h so it is in order by function type. Make legacy functions call non-legacy functions rather than vice-versa. Convert cpus.c to use new API. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add qemu_clock_get_ms and qemu_clock_get_msAlex Bligh2013-08-221-0/+28
| | | | | | | Add utility functions qemu_clock_get_ms and qemu_clock_get_us Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove legacy qemu_clock_deadline & qemu_timerlist_deadlineAlex Bligh2013-08-221-16/+0Star
| | | | | | | | Remove qemu_clock_deadline and qemu_timerlist_deadline now we are using the ns functions throughout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove alarm timersAlex Bligh2013-08-221-3/+0Star
| | | | | | | | Remove alarm timers from qemu-timers.c now we use g_poll / ppoll instead. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add documentation and new format callsAlex Bligh2013-08-221-22/+184
| | | | | | | | | Add documentation for existing qemu timer calls. Add new format calls of the format timer_XXX rather than qemu_XXX_timer for consistency. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Use all timerlists in icount warp calculationsAlex Bligh2013-08-221-0/+13
| | | | | | | | | | | | | | | | | | | Notify all timerlists derived from vm_clock in icount warp calculations. When calculating timer delay based on vm_clock deadline, use all timerlists. For compatibility, maintain an apparent bug where when using icount, if no vm_clock timer was set, qemu_clock_deadline would return INT32_MAX and always set an icount clock expiry about 2 seconds ahead. NB: thread safety - when different timerlists sit on different threads, this will need some locking. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Introduce new API timer_new and friendsAlex Bligh2013-08-221-0/+69
| | | | | | | | Introduce new API for creating timers - timer_new and _ns, _ms, _us derivatives. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: On timer modification, qemu_notify or aio_notifyAlex Bligh2013-08-221-0/+9
| | | | | | | | | | | On qemu_mod_timer_ns, ensure qemu_notify or aio_notify is called to end the appropriate poll(), irrespective of use_icount value. On qemu_clock_enable, ensure qemu_notify or aio_notify is called for all QEMUTimerLists attached to the QEMUClock. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add a notify callback to QEMUTimerListAlex Bligh2013-08-221-4/+23
| | | | | | | | Add a notify pointer to QEMUTimerList so it knows what to notify on a timer change. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add QEMUTimerListGroup and helper functionsAlex Bligh2013-08-221-0/+49
| | | | | | | | | | | Add QEMUTimerListGroup and helper functions, to represent a QEMUTimerList associated with each clock. Add a default QEMUTimerListGroup representing the default timer lists which are not associated with any other object (e.g. an AioContext as added by future patches). Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Untangle include filesAlex Bligh2013-08-221-1/+0Star
| | | | | | | | | | include/qemu/timer.h has no need to include main-loop.h and doing so causes an issue for the next patch. Unfortunately various files assume including timers.h will pull in main-loop.h. Untangle this mess. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Split QEMUClock into QEMUClock and QEMUTimerListAlex Bligh2013-08-221-23/+325
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split QEMUClock into QEMUClock and QEMUTimerList so that we can have more than one QEMUTimerList associated with the same clock. Introduce a main_loop_timerlist concept and make existing qemu_clock_* calls that actually should operate on a QEMUTimerList call the relevant QEMUTimerList implementations, using the clock's default timerlist. This vastly reduces the invasiveness of this change and means the API stays constant for existing users. Introduce a list of QEMUTimerLists associated with each clock so that reenabling the clock can cause all the notifiers to be called. Note the code to do the notifications is added in a later patch. Switch QEMUClockType to an enum. Remove global variables vm_clock, host_clock and rt_clock and add compatibility defines. Do not fix qemu_next_alarm_deadline as it's going to be deleted. Add qemu_clock_use_for_deadline to indicate whether a particular clock should be used for deadline calculations. When use_icount is true, vm_clock should not be used for deadline calculations as it does not contain a nanosecond count. Instead, icount timeouts come from the execution thread doing aio_notify or qemu_notify as appropriate. This function is used in the next patch. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Make qemu_run_timers and qemu_run_all_timers return progressAlex Bligh2013-08-221-2/+19
| | | | | | | | | Make qemu_run_timers and qemu_run_all_timers return progress so that aio_poll etc. can determine whether a timer has been run. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: add ppoll support with qemu_poll_nsAlex Bligh2013-08-221-0/+12
| | | | | | | | Add qemu_poll_ns which works like g_poll but takes a nanosecond timeout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: add qemu-timer.c utility functionsAlex Bligh2013-08-221-0/+42
| | | | | | | | | | | | | | | Add utility functions to qemu-timer.c for nanosecond timing. Add qemu_clock_deadline_ns to calculate deadlines to nanosecond accuracy. Add utility function qemu_soonest_timeout to calculate soonest deadline. Add qemu_timeout_ns_to_ms to convert a timeout in nanoseconds back to milliseconds for when ppoll is not used. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rename qemu_new_clock and expose clock typesAlex Bligh2013-08-221-0/+4
| | | | | | | | | Rename qemu_new_clock to qemu_clock_new. Expose clock types. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rename qemu_timer_* functionsAlex Bligh2013-08-221-3/+3
| | | | | | | | | | | | Rename four functions in preparation for new API. Rename qemu_timer_expired to timer_expired Rename qemu_timer_expire_time_ns to timer_expire_time_ns Rename qemu_timer_pending to timer_pending Rename qemu_timer_expired_ns to timer_expired_ns Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Remove unnecessary FreeBSD #includeEd Maste2013-04-251-4/+0Star
| | | | | | | | | | | | sys/param.h was included to define __FreeBSD_version, but the conditional using it was removed by commit d05ef160453e98546a4197496dc8a3cb2defac53 (Brad Smith, "Allow clock_gettime() monotonic clock to be utilized on more OS's"), so the include is no longer needed here. Signed-off-by: Ed Maste <emaste@freebsd.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1366906631-2680-1-git-send-email-emaste@freebsd.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* Allow clock_gettime() monotonic clock to be utilized on more OS'sBrad Smith2013-04-051-2/+1Star
| | | | | | | | | | | | Allow the clock_gettime() code using monotonic clock to be utilized on more POSIX compliannt OS's. This started as a fix for OpenBSD which was listed in one function as part of the previous hard coded list of OS's for the functions to support but not in the other. Signed-off-by: Brad Smith <brad@comstyle.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20130405003748.GH884@rox.home.comstyle.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* misc: move include files to include/qemu/Paolo Bonzini2012-12-191-0/+310
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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