[Qemu-devel] [PATCH 0/3] qemu-timer: make QEMUTimer functions thread-safe

[Stefan Hajnoczi]

This series makes the following functions thread-safe:

  qemu_mod_timer_ns()
  qemu_mod_timer()
  qemu_del_timer()
  qemu_timer_pending()

The following were already thread-safe:

  qemu_free_timer()
  qemu_new_timer()
  qemu_timer_expired()

Now it is possible to use QEMUTimer outside the QEMU global mutex.  Timer
callbacks are still invoked from the main loop.  If a thread wishes to run
timer callbacks it must use a thread-safe QEMUBH (which Ping Fan Liu is working
on).

Note that host_clock is not thread-safe because it keeps state and invokes
reset notifiers.  Device emulation threads mostly care about vm_clock, so this
is not a problem.

Stefan Hajnoczi (3):
  qemu-timer: drop outdated signal safety comments
  qemu-timer: add QEMUClock->active_timers list lock
  qemu-timer: add qemu_alarm_timer->timer_modified_lock

 qemu-timer.c | 129 +++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 90 insertions(+), 39 deletions(-)

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1.8.1.4