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Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permane
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails |
Date: |
Wed, 1 Jul 2015 18:49:07 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1 |
On 01/07/2015 17:48, Zavadovsky Yan wrote:
> Ping.
Stefan, are you merging this?
Paolo
> Patchwork: http://patchwork.ozlabs.org/patch/488073/
>
> v1
> discussion:
> http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg05791.html
> and patchworks: http://patchwork.ozlabs.org/patch/487438/
> http://patchwork.ozlabs.org/patch/487566/
>
> On Wed, Jun 24, 2015 at 3:25 PM, Zavadovsky Yan
> <address@hidden <mailto:address@hidden>> wrote:
>
> Calling SuspendThread() is not enough to suspend Win32 thread.
> We need to call GetThreadContext() after SuspendThread()
> to make sure that OS have really suspended target thread.
> But GetThreadContext() needs for THREAD_GET_CONTEXT
> access right on thread object.
> More info about this technique can be found here:
> http://blogs.msdn.com/b/oldnewthing/archive/2015/02/05/10591215.aspx
>
> This patch adds THREAD_GET_CONTEXT to OpenThread() arguments
> and change oddity 'while(GetThreadContext() == SUCCESS)' to
> 'if(GetThreadContext() == FAILED){exit(1);}'.
> So this block of code will continue only after successful
> grabbing of thread context(i.e. when thread is really suspended).
> And halts otherwise with more verbose error message than previous.
>
> Signed-off-by: Zavadovsky Yan <address@hidden
> <mailto:address@hidden>>
> ---
> cpus.c | 14 ++++++++------
> util/qemu-thread-win32.c | 4 ++--
> 2 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/cpus.c b/cpus.c
> index 4f0e54d..0df6a7d 100644
> --- a/cpus.c
> +++ b/cpus.c
> @@ -1089,8 +1089,8 @@ static void qemu_cpu_kick_thread(CPUState *cpu)
> CONTEXT tcgContext;
>
> if (SuspendThread(cpu->hThread) == (DWORD)-1) {
> - fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
> - GetLastError());
> + fprintf(stderr, "qemu:%s: SuspendThread
> GetLastError:%lu\n",
> + __func__, GetLastError());
> exit(1);
> }
>
> @@ -1098,15 +1098,17 @@ static void qemu_cpu_kick_thread(CPUState *cpu)
> * suspended until we can get the context.
> */
> tcgContext.ContextFlags = CONTEXT_CONTROL;
> - while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
> - continue;
> + if (GetThreadContext(cpu->hThread, &tcgContext) == 0) {
> + fprintf(stderr, "qemu:%s: GetThreadContext
> GetLastError:%lu\n",
> + __func__, GetLastError());
> + exit(1);
> }
>
> cpu_signal(0);
>
> if (ResumeThread(cpu->hThread) == (DWORD)-1) {
> - fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
> - GetLastError());
> + fprintf(stderr, "qemu:%s: ResumeThread GetLastError:%lu\n",
> + __func__, GetLastError());
> exit(1);
> }
> }
> diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c
> index 406b52f..823eca1 100644
> --- a/util/qemu-thread-win32.c
> +++ b/util/qemu-thread-win32.c
> @@ -406,8 +406,8 @@ HANDLE qemu_thread_get_handle(QemuThread *thread)
>
> EnterCriticalSection(&data->cs);
> if (!data->exited) {
> - handle = OpenThread(SYNCHRONIZE | THREAD_SUSPEND_RESUME, FALSE,
> - thread->tid);
> + handle = OpenThread(SYNCHRONIZE | THREAD_SUSPEND_RESUME |
> THREAD_GET_CONTEXT,
> + FALSE, thread->tid);
> } else {
> handle = NULL;
> }
> --
> 2.4.4.windows.2
>
>
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Zavadovsky Yan, 2015/07/01
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Liviu Ionescu, 2015/07/01
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Stefan Weil, 2015/07/01
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Fabien Chouteau, 2015/07/02
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Zavadovsky Yan, 2015/07/02
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Fabien Chouteau, 2015/07/06
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Zavadovsky Yan, 2015/07/14
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Stefan Weil, 2015/07/14
- Re: [Qemu-devel] [PATCH v2] thread-win32: fix GetThreadContext() permanently fails, Zavadovsky Yan, 2015/07/14