[PATCH 1/3] rte_interrupts: add rte_eal_intr_exit to shut down IRQ thread

[Matthew Hall <mhall@mhcomputing.net>]

There is no good way to shut down this thread from an application signal
handler. Here we add an rte_eal_intr_exit() function to allow this.

Signed-off-by: Matthew Hall <mhall@mhcomputing.net>
---
 lib/librte_eal/common/include/rte_eal.h      |  9 +++++++++
 lib/librte_eal/linuxapp/eal/eal_interrupts.c | 11 +++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_eal.h b/lib/librte_eal/common/include/rte_eal.h
index d2816a8..1533eeb 100644
--- a/lib/librte_eal/common/include/rte_eal.h
+++ b/lib/librte_eal/common/include/rte_eal.h
@@ -165,6 +165,15 @@ int rte_eal_init(int argc, char **argv);
 typedef void	(*rte_usage_hook_t)(const char * prgname);
 
 /**
+ * Shut down the EAL interrupt thread.
+ *
+ * This function can be called from a signal handler during application
+ * shutdown.
+ *
+ */
+int rte_eal_intr_exit(void);
+
+/**
  * Add application usage routine callout from the eal_usage() routine.
  *
  * This function allows the application to include its usage message
diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index b33ccdb..aa332a1 100644
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -892,6 +892,17 @@ rte_eal_intr_init(void)
 		if (ret_1 != 0)
 			RTE_LOG(ERR, EAL,
 			"Failed to set thread name for interrupt handling\n");
+
+int
+rte_eal_intr_exit(void)
+{
+	int ret = 0;
+
+	ret = pthread_cancel(intr_thread);
+	if (ret != 0) {
+		RTE_LOG(ERR, EAL,
+			"Failed to cancel thread for interrupt handling\n");
+		return -ret;
 	}
 
 	return -ret;
-- 
2.5.0