eal/windows: cleanup interrupt resources

Interrupt manager in Windows EAL allocates on IOCP and starts
a control thread that runs indefinitely. At DPDK cleanup
this thread was not stopped and IOCP handle was not closed.

Gracefully stop interrupt-handling in rte_eal_cleanup().
The thread already closes IOCP handle before exiting.

Fixes: 5c016fc0205a ("eal/windows: add interrupt thread skeleton")
Cc: stable@dpdk.org

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Acked-by: Ranjit Menon <ranjit.menon@intel.com>
Acked-by: Jie Zhou <jizh@microsoft.com>
Tested-by: Jie Zhou <jizh@microsoft.com>

lib/eal/windows/eal.c

@@ -258,6 +258,8 @@ rte_eal_cleanup(void)
 {
 	struct internal_config *internal_conf =
 		eal_get_internal_configuration();
+
+	eal_intr_thread_cancel();
 	/* after this point, any DPDK pointers will become dangling */
 	rte_eal_memory_detach();
 	eal_cleanup_config(internal_conf);

lib/eal/windows/eal_interrupts.c

@@ -7,6 +7,8 @@
 #include "eal_private.h"
 #include "eal_windows.h"
 
+#define IOCP_KEY_SHUTDOWN UINT32_MAX
+
 static pthread_t intr_thread;
 
 static HANDLE intr_iocp;
@@ -34,12 +36,14 @@ eal_intr_thread_handle_init(void)
 static void *
 eal_intr_thread_main(LPVOID arg __rte_unused)
 {
+	bool finished = false;
+
 	if (eal_intr_thread_handle_init() < 0) {
 		RTE_LOG(ERR, EAL, "Cannot open interrupt thread handle\n");
 		goto cleanup;
 	}
 
-	while (1) {
+	while (!finished) {
 		OVERLAPPED_ENTRY events[16];
 		ULONG event_count, i;
 		BOOL result;
@@ -61,8 +65,13 @@ eal_intr_thread_main(LPVOID arg __rte_unused)
 			continue;
 		}
 
-		for (i = 0; i < event_count; i++)
+		for (i = 0; i < event_count; i++) {
+			if (events[i].lpCompletionKey == IOCP_KEY_SHUTDOWN) {
+				finished = true;
+				break;
+			}
 			eal_intr_process(&events[i]);
+		}
 	}
 
 	CloseHandle(intr_thread_handle);
@@ -125,6 +134,19 @@ eal_intr_thread_schedule(void (*func)(void *arg), void *arg)
 	return 0;
 }
 
+void
+eal_intr_thread_cancel(void)
+{
+	if (!PostQueuedCompletionStatus(
+			intr_iocp, 0, IOCP_KEY_SHUTDOWN, NULL)) {
+		RTE_LOG_WIN32_ERR("PostQueuedCompletionStatus()");
+		RTE_LOG(ERR, EAL, "Cannot cancel interrupt thread\n");
+		return;
+	}
+
+	WaitForSingleObject(intr_thread_handle, INFINITE);
+}
+
 int
 rte_intr_callback_register(
 	__rte_unused const struct rte_intr_handle *intr_handle,

lib/eal/windows/eal_windows.h

@@ -67,6 +67,11 @@ unsigned int eal_socket_numa_node(unsigned int socket_id);
  */
 int eal_intr_thread_schedule(void (*func)(void *arg), void *arg);
 
+/**
+ * Request interrupt thread to stop and wait its termination.
+ */
+void eal_intr_thread_cancel(void);
+
 /**
  * Open virt2phys driver interface device.
  *