[dpdk-dev] [PATCH v2] eal/windows: fix invalid thread handle

[dpdk-dev] [PATCH v2] eal/windows: fix invalid thread handle

[Tasnim Bashar]

Casting thread ID to handle is not accurate way to get thread handle.
Need to use OpenThread function to get thread handle from thread ID.

pthread_setaffinity_np and pthread_getaffinity_np functions
for Windows are affected because of it.

Signed-off-by: Tasnim Bashar <tbashar@mellanox.com>
---
 lib/librte_eal/windows/include/pthread.h     | 56 ++++++++++++++++----
 lib/librte_eal/windows/include/rte_windows.h |  1 +
 2 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/lib/librte_eal/windows/include/pthread.h b/lib/librte_eal/windows/include/pthread.h
index 0bbed5c3b8..88dab36b79 100644
--- a/lib/librte_eal/windows/include/pthread.h
+++ b/lib/librte_eal/windows/include/pthread.h
@@ -16,8 +16,8 @@
 extern "C" {
 #endif
 
-#include <windows.h>
 #include <rte_common.h>
+#include <rte_windows.h>
 
 #define PTHREAD_BARRIER_SERIAL_THREAD TRUE
 
@@ -41,31 +41,67 @@ typedef SYNCHRONIZATION_BARRIER pthread_barrier_t;
 #define pthread_self() \
 	((pthread_t)GetCurrentThreadId())
 #define pthread_setaffinity_np(thread, size, cpuset) \
-	eal_set_thread_affinity_mask(thread, (unsigned long *) cpuset)
+	eal_set_thread_affinity_mask(thread, (long long *) cpuset)
 #define pthread_getaffinity_np(thread, size, cpuset) \
-	eal_get_thread_affinity_mask(thread, (unsigned long *) cpuset)
+	eal_get_thread_affinity_mask(thread, (long long *) cpuset)
 #define pthread_create(threadid, threadattr, threadfunc, args) \
 	eal_create_thread(threadid, threadfunc, args)
 
 static inline int
-eal_set_thread_affinity_mask(pthread_t threadid, unsigned long *cpuset)
+eal_set_thread_affinity_mask(pthread_t threadid, long long *cpuset)
 {
-	SetThreadAffinityMask((HANDLE) threadid, *cpuset);
+	DWORD_PTR ret;
+	HANDLE thread_handle;
+
+	thread_handle = OpenThread(THREAD_ALL_ACCESS, FALSE, threadid);
+	if (thread_handle == NULL) {
+		RTE_LOG_WIN32_ERR("OpenThread()");
+		return -1;
+	}
+
+	ret = SetThreadAffinityMask(thread_handle, *cpuset);
+	if (ret == 0) {
+		RTE_LOG_WIN32_ERR("SetThreadAffinityMask()");
+		CloseHandle(thread_handle);
+		return -1;
+	}
+	CloseHandle(thread_handle);
 	return 0;
 }
 
 static inline int
-eal_get_thread_affinity_mask(pthread_t threadid, unsigned long *cpuset)
+eal_get_thread_affinity_mask(pthread_t threadid, long long *cpuset)
 {
 	/* Workaround for the lack of a GetThreadAffinityMask()
 	 *API in Windows
 	 */
-		/* obtain previous mask by setting dummy mask */
-	DWORD dwprevaffinitymask =
-		SetThreadAffinityMask((HANDLE) threadid, 0x1);
+	DWORD_PTR dwprevaffinitymask;
+	HANDLE thread_handle;
+	DWORD_PTR ret;
+
+	thread_handle = OpenThread(THREAD_ALL_ACCESS, FALSE, threadid);
+	if (thread_handle == NULL) {
+		RTE_LOG_WIN32_ERR("OpenThread()");
+		return -1;
+	}
+
+	/* obtain previous mask by setting dummy mask */
+	dwprevaffinitymask = SetThreadAffinityMask(thread_handle, 0x1);
+	if (dwprevaffinitymask == 0) {
+		RTE_LOG_WIN32_ERR("SetThreadAffinityMask()");
+		CloseHandle(thread_handle);
+		return -1;
+	}
+
 	/* set it back! */
-	SetThreadAffinityMask((HANDLE) threadid, dwprevaffinitymask);
+	ret = SetThreadAffinityMask(thread_handle, dwprevaffinitymask);
+	if (ret == 0) {
+		RTE_LOG_WIN32_ERR("SetThreadAffinityMask()");
+		CloseHandle(thread_handle);
+		return -1;
+	}
 	*cpuset = dwprevaffinitymask;
+	CloseHandle(thread_handle);
 	return 0;
 }
 
diff --git a/lib/librte_eal/windows/include/rte_windows.h b/lib/librte_eal/windows/include/rte_windows.h
index ed6e4c1485..677b63c42d 100644
--- a/lib/librte_eal/windows/include/rte_windows.h
+++ b/lib/librte_eal/windows/include/rte_windows.h
@@ -29,6 +29,7 @@
 #define INITGUID
 #endif
 #include <initguid.h>
+#include <rte_log.h>
 
 /**
  * Log GetLastError() with context, usually a Win32 API function and arguments.
-- 
2.19.1.windows.1

Re: [dpdk-dev] [PATCH v2] eal/windows: fix invalid thread handle

[Dmitry Kozlyuk]

On Sat, 23 May 2020 00:25:56 -0700
Tasnim Bashar <tbashar@mellanox.com> wrote:

> Casting thread ID to handle is not accurate way to get thread handle.
> Need to use OpenThread function to get thread handle from thread ID.
> 
> pthread_setaffinity_np and pthread_getaffinity_np functions
> for Windows are affected because of it.
> 
> Signed-off-by: Tasnim Bashar <tbashar@mellanox.com>
> ---

Please use --in-reply-to=Message-ID-of-previous-version to send v2, etc.
If you're using Outlook, you can find message ID as follows:

https://support.office.com/en-us/article/view-internet-message-headers-in-outlook-cd039382-dc6e-4264-ac74-c048563d212c

For example, this is how this patch should have been sent:

git send-email --in-reply-to=20200522001112.48932-1-tbashar@mellanox.com ...

[snip]
> +
>  	/* set it back! */
> -	SetThreadAffinityMask((HANDLE) threadid, dwprevaffinitymask);
> +	ret = SetThreadAffinityMask(thread_handle, dwprevaffinitymask);
> +	if (ret == 0) {
> +		RTE_LOG_WIN32_ERR("SetThreadAffinityMask()");
> +		CloseHandle(thread_handle);
> +		return -1;
> +	}
>  	*cpuset = dwprevaffinitymask;

Getting a warning with MinGW-w64:

In file included from ../../../../../lib/librte_eal/include/rte_eal.h:15,
                 from ../../../../../lib/librte_eal/common/eal_common_options.c:24:
../../../../../lib/librte_eal/common/eal_common_options.c: In function 'eal_adjust_config':
../../../../../lib/librte_eal/windows/include/sched.h:63:40: warning: 'default_set' may be used uninitialized in this function [-Wmaybe-uninitialized]
   63 |   (dst)->_bits[_i] = (src1)->_bits[_i] & (src2)->_bits[_i]; \
      |                                        ^
../../../../../lib/librte_eal/common/eal_common_options.c:1624:15: note: 'default_set' was declared here
 1624 |  rte_cpuset_t default_set;
      |               ^~~~~~~~~~~

This is correct, because you only initialize first "long long" in
rte_cpuset_t and not the second. Since we're trying not to introduce new
warnings, the fix is as follows:

	memset(cpuset, 0, sizeof(rte_cpuset_t));

"sizeof(rte_cpuset_t)" requires <sched.h> and then it's probably worth using
"rte_cpuset_t *" for instead of "long long *" for the parameter.

-- 
Dmitry Kozlyuk

Re: [dpdk-dev] [PATCH v2] eal/windows: fix invalid thread handle

[Thomas Monjalon]

25/05/2020 03:02, Dmitry Kozlyuk:
> On Sat, 23 May 2020 00:25:56 -0700
> Tasnim Bashar <tbashar@mellanox.com> wrote:
> 
> > Casting thread ID to handle is not accurate way to get thread handle.
> > Need to use OpenThread function to get thread handle from thread ID.
> > 
> > pthread_setaffinity_np and pthread_getaffinity_np functions
> > for Windows are affected because of it.
> > 
> > Signed-off-by: Tasnim Bashar <tbashar@mellanox.com>
> > ---
> 
> Please use --in-reply-to=Message-ID-of-previous-version to send v2, etc.

I should update the doc to ask replying to the first patch.


> If you're using Outlook, you can find message ID as follows:
> 
> https://support.office.com/en-us/article/view-internet-message-headers-in-outlook-cd039382-dc6e-4264-ac74-c048563d212c

You can also find the message ID in patchwork or inbox.dpdk.org.


> For example, this is how this patch should have been sent:
> 
> git send-email --in-reply-to=20200522001112.48932-1-tbashar@mellanox.com ...