Re: [Qemu-devel] [PATCH 0/4] qemu-timer: introduce usable pointer-free API

[Paolo Bonzini <pbonzini@redhat.com>]

On 09/01/2015 03:10, Fam Zheng wrote:
> On Thu, 01/08 11:03, Paolo Bonzini wrote:
>> The current pointer free API for timers is very low level.  Introduce
>> a new API that matches timer_new_ns/us/ms and also a new API timer_deinit
>> that can be used instead of timer_free.
>>
>> Finally, mechanically change timer macro names in vmstate, to make it
>> clear that they accept a pointer.
>>
>> This prepares for conversion of timers from QEMUTimer * to QEMUTimer.
> 
> Novice question: what's the advantage, please?

No need to free them, so no memory leaks.  From a quick look I found two
(hw/net/pcnet.c and hw/char/serial.c).

Also it matches more recent device model APIs like memory regions or
throttling.

Paolo

> Fam
> 
>>
>> Paolo
>>
>> Paolo Bonzini (4):
>>   qemu-timer: rename timer_init to timer_init_tl
>>   qemu-timer: add timer_init and timer_init_ns/us/ms
>>   qemu-timer: introduce timer_deinit
>>   vmstate: accept QEMUTimer in VMSTATE_TIMER*, add VMSTATE_TIMER_PTR*
>>
>>  hw/acpi/ich9.c              |  2 +-
>>  hw/acpi/piix4.c             |  2 +-
>>  hw/arm/stellaris.c          |  2 +-
>>  hw/block/fdc.c              |  2 +-
>>  hw/char/cadence_uart.c      |  2 +-
>>  hw/char/serial.c            |  4 +-
>>  hw/core/ptimer.c            |  2 +-
>>  hw/dma/pl330.c              |  2 +-
>>  hw/input/lm832x.c           |  2 +-
>>  hw/intc/armv7m_nvic.c       |  2 +-
>>  hw/isa/vt82c686.c           |  2 +-
>>  hw/misc/macio/cuda.c        |  2 +-
>>  hw/net/pcnet.c              |  2 +-
>>  hw/sd/sdhci.c               |  4 +-
>>  hw/timer/a9gtimer.c         |  2 +-
>>  hw/timer/arm_mptimer.c      |  2 +-
>>  hw/timer/hpet.c             |  2 +-
>>  hw/timer/mc146818rtc.c      |  4 +-
>>  hw/usb/hcd-ehci.c           |  2 +-
>>  hw/usb/hcd-ohci.c           |  2 +-
>>  hw/usb/hcd-uhci.c           |  2 +-
>>  hw/usb/hcd-xhci.c           |  2 +-
>>  hw/usb/redirect.c           |  2 +-
>>  hw/watchdog/wdt_i6300esb.c  |  2 +-
>>  hw/watchdog/wdt_ib700.c     |  2 +-
>>  include/block/aio.h         |  2 +-
>>  include/migration/vmstate.h | 18 +++++++--
>>  include/qemu/timer.h        | 94 ++++++++++++++++++++++++++++++++++++++++++---
>>  qemu-timer.c                | 20 +++++++---
>>  target-arm/machine.c        |  4 +-
>>  30 files changed, 149 insertions(+), 45 deletions(-)
>>
>> -- 
>> 2.1.0
>>
>>
> 
>