Re: [Qemu-devel] [PATCH uq/master 00/21] Win32 iothread support

[Anthony Liguori]

On 02/21/2011 02:43 AM, Paolo Bonzini wrote:
> After gathering the comments about the two series I sent separately,
> here is the full series for Win32 iothread support, ready to be
> applied to uq/master.
>
> Patches 1 to 5 are generic Win32 improvements, including the qemu-thread
> implementation.  Because of complex dependencies, I think it's better
> if this part is also routed through uq/master.
>
> Patches 6 to 8 are generic threading improvements, including using
> PTHREAD_MUTEX_ERRORCHECK as suggested by Jan.
>
> Patches 9 to 16 eliminate polling, replacing condition variable
> timedwait with wait.
>
> Patch 17 removes a redundant condition from the TCG cpu_exec_all
> function.
>
> Patches 18 to 20 add all necessary stubs to make iothread compile
> with Win32, except the IPI calls.  These are provided by patch 21.
>
> Tested on Wine and Linux, not on "real" Windows.  The series introduces
> a dependency on Windows 2K or newer.  I don't think either 95/98/ME
> or Windows NT 3.x are reasonable host systems for QEMU, anyway.
>
> I incorporated all suggestions from Jan.
>    

So why reinvent this instead of just using glib for thread support?

Regards,

Anthony Liguori

> Paolo Bonzini (21):
>    unlock iothread during WaitForMultipleObjects
>    implement win32 dynticks timer
>    use win32 timer queues
>    replace qemu_thread_equal API with qemu_thread_is_current
>    add win32 qemu-thread implementation
>    include qemu-thread.h early
>    add assertions on the owner of a QemuMutex
>    remove CONFIG_THREAD
>    inline cpu_halted into sole caller
>    always qemu_cpu_kick after unhalting a cpu
>    exit round-robin vcpu loop if cpu->stopped is true
>    always signal pause_cond after stopping a VCPU
>    do not use timedwait on qemu_halt_cond
>    do not use timedwait on qemu_system_cond
>    do not use timedwait on qemu_pause_cond
>    do not use timedwait on qemu_cpu_cond
>    iothread stops the vcpu thread via IPI
>    move blocking of signals to qemu_signalfd_init
>    provide dummy signal init functions for win32
>    protect qemu_cpu_kick_self for Win32
>    add Win32 IPI service
>
>   Makefile.objs                        |    4 +-
>   configure                            |    2 -
>   cpu-defs.h                           |    1 +
>   cpu-exec.c                           |   17 ++-
>   cpus.c                               |  288 +++++++++++++++++----------------
>   hw/apic.c                            |    1 +
>   hw/ppc.c                             |    2 +
>   hw/sun4m.c                           |   10 +-
>   hw/sun4u.c                           |    4 +-
>   os-win32.c                           |    2 +
>   qemu-thread.c =>  qemu-thread-posix.c |   40 +++--
>   qemu-thread-posix.h                  |   18 ++
>   qemu-thread-win32.c                  |  261 ++++++++++++++++++++++++++++++
>   qemu-thread-win32.h                  |   21 +++
>   qemu-thread.h                        |   29 ++--
>   qemu-timer.c                         |   88 +++++------
>   target-alpha/exec.h                  |   11 --
>   target-arm/exec.h                    |   13 --
>   target-cris/exec.h                   |   11 --
>   target-i386/exec.h                   |   12 --
>   target-m68k/exec.h                   |   10 --
>   target-microblaze/exec.h             |   11 --
>   target-mips/exec.h                   |   11 --
>   target-ppc/exec.h                    |   11 --
>   target-s390x/exec.h                  |   12 --
>   target-s390x/kvm.c                   |    1 +
>   target-sh4/cpu.h                     |    1 -
>   target-sh4/exec.h                    |   11 --
>   target-sparc/exec.h                  |   10 --
>   29 files changed, 559 insertions(+), 353 deletions(-)
>   rename qemu-thread.c =>  qemu-thread-posix.c (78%)
>   create mode 100644 qemu-thread-posix.h
>   create mode 100644 qemu-thread-win32.c
>   create mode 100644 qemu-thread-win32.h
>
>