[Qemu-devel] [PATCH v4 0/3] qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe

[Stefan Hajnoczi <stefanha@redhat.com>]

v4:
 * Rebased & retested for easy review and merge
 * No code changes

v3:
 * Squashed Paolo's fixes and added his patch to avoid locking in timer_pending()

v2:
 * Rebased onto qemu.git/master following the merge of Alex's AioContext timers

The purpose of these patches is to eventually allow device models to set and
cancel timers without holding the global mutex.  When the device model runs in
a vcpu thread and the iothread processes timers, the
QEMUTimerList->active_timers must be protected from concurrent access.

Patch 1 is a clean-up.

Patch 2 is the entire change needed to protect ->active_timers.

Patch 3 makes timer_pending() run without a lock.

Paolo Bonzini (1):
  qemu-timer: do not take the lock in timer_pending

Stefan Hajnoczi (2):
  qemu-timer: drop outdated signal safety comments
  qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe

 include/qemu/timer.h | 17 ++++++++++
 qemu-timer.c         | 92 ++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 81 insertions(+), 28 deletions(-)

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1.8.3.1