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timer: make qemu_clock_enable sync between disable and timer's cb

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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>
This commit is contained in:
Liu Ping Fan 2013-09-25 14:21:00 +08:00 • committed by Paolo Bonzini
parent c7c4d063f5
commit 3c05341157
2 changed files with 28 additions and 1 deletions
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6
include/qemu/timer.h
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@ -189,6 +189,12 @@ void qemu_clock_notify(QEMUClockType type);
* @enabled: true to enable, false to disable
*
* Enable or disable a clock
* Disabling the clock will wait for related timerlists to stop
* executing qemu_run_timers. Thus, this functions should not
* be used from the callback of a timer that is based on @clock.
* Doing so would cause a deadlock.
*
* Caller should hold BQL.
*/
void qemu_clock_enable(QEMUClockType type, bool enabled);