Attachment 126676 Details for Bug 97880 – proposed patch

[patch] proposed patch

0001-Add-processed-all-input-dev-removes-barrier.patch (text/plain), 3.15 KB, created by Mihail Konev on 2016-09-20 21:00:17 UTC

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Creator: Mihail Konev

Created: 2016-09-20 21:00:17 UTC

Size: 3.15 KB

patch

obsolete

>From c927f4ccf933b0ef41b8059ac8f02a6b7e4fe16a Mon Sep 17 00:00:00 2001
>From: Mihail Konev <k.mvc@ya.ru>
>Date: Tue, 20 Sep 2016 18:43:15 +0000
>Subject: [PATCH xserver] Add processed-all-input-dev-removes barrier
>
>Signed-off-by: Mihail Konev <k.mvc@ya.ru>
>---
> hw/xfree86/common/xf86Events.c |  1 +
> include/input.h                |  2 ++
> os/inputthread.c               | 20 ++++++++++++++++++++
> 3 files changed, 23 insertions(+)
>
>diff --git a/hw/xfree86/common/xf86Events.c b/hw/xfree86/common/xf86Events.c
>index 9a8f432a0556..92b1ec5c00cb 100644
>--- a/hw/xfree86/common/xf86Events.c
>+++ b/hw/xfree86/common/xf86Events.c
>@@ -438,6 +438,7 @@ xf86VTLeave(void)
>     }
>     for (pInfo = xf86InputDevs; pInfo; pInfo = pInfo->next)
>         xf86DisableInputDeviceForVTSwitch(pInfo);
>+    input_wait_for_processing_all_removes();
> 
>     input_lock();
>     for (i = 0; i < xf86NumScreens; i++)
>diff --git a/include/input.h b/include/input.h
>index e0f6b9b01d97..3635b8ab4e97 100644
>--- a/include/input.h
>+++ b/include/input.h
>@@ -719,6 +719,8 @@ extern _X_EXPORT void input_lock(void);
> extern _X_EXPORT void input_unlock(void);
> extern _X_EXPORT void input_force_unlock(void);
> 
>+extern _X_EXPORT void input_wait_for_processing_all_removes(void);
>+
> extern void InputThreadPreInit(void);
> extern void InputThreadInit(void);
> extern void InputThreadFini(void);
>diff --git a/os/inputthread.c b/os/inputthread.c
>index 6aa0a9ce6fb5..c7f051759b86 100644
>--- a/os/inputthread.c
>+++ b/os/inputthread.c
>@@ -90,6 +90,17 @@ static pthread_mutex_t input_mutex;
> static Bool input_mutex_initialized;
> #endif
> 
>+static Bool waiting_for_processing_all_removes = FALSE;
>+static int unprocessed_removes_count = 0;
>+static pthread_barrier_t all_removes_processed_barrier;
>+
>+void
>+input_wait_for_processing_all_removes(void)
>+{
>+    waiting_for_processing_all_removes = TRUE;
>+    pthread_barrier_wait(&all_removes_processed_barrier);
>+}
>+
> void
> input_lock(void)
> {
>@@ -267,6 +278,7 @@ InputThreadUnregisterDev(int fd)
> 
>     dev->state = device_state_removed;
>     inputThreadInfo->changed = TRUE;
>+    unprocessed_removes_count++;
> 
>     input_unlock();
> 
>@@ -348,12 +360,18 @@ InputThreadDoWork(void *arg)
>                     ospoll_remove(inputThreadInfo->fds, dev->fd);
>                     xorg_list_del(&dev->node);
>                     free(dev);
>+                    unprocessed_removes_count--;
>                     break;
>                 }
>             }
>             input_unlock();
>         }
> 
>+        if (!unprocessed_removes_count && waiting_for_processing_all_removes) {
>+            waiting_for_processing_all_removes = FALSE;
>+            pthread_barrier_wait(&all_removes_processed_barrier);
>+        }
>+
>         if (ospoll_wait(inputThreadInfo->fds, -1) < 0) {
>             if (errno == EINVAL)
>                 FatalError("input-thread: %s (%s)", __func__, strerror(errno));
>@@ -400,6 +418,8 @@ InputThreadPreInit(void)
>     if (!inputThreadInfo)
>         FatalError("input-thread: could not allocate memory");
> 
>+    pthread_barrier_init(&all_removes_processed_barrier, NULL, 2);
>+
>     inputThreadInfo->thread = 0;
>     xorg_list_init(&inputThreadInfo->devs);
>     inputThreadInfo->fds = ospoll_create();
>-- 
>2.9.2
>

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