rpc/socket.c: Modify approach to cleanup threads of socket_poller in socket_spawn.

Problem: Current approach to cleanup threads of socket_poller is not appropriate.

Solution: Enable detach flag at the time of thread creation in socket_spawn.

Fix: Write a new wrapper(gf_create_detach_thread) to create detachable thread
     instead of store thread ids in a queue.

Test: Fix is verfied on gluster process, To test the patch followed below procedure
      Enable the client.ssl and server.ssl option on the volume
      Start the volume and count anon segment in pmap output for glusterd process
      pmap -x <glusterd-pid> | grep "\[ anon \]" | wc -l
      Stop the volume and check again count of anon segment it should not increase.

Backport of commit 2ee48474be32f6ead2f3834677fee89d88348382

> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
> Change-Id: Ib8f7ec7504ec8f6f74b45ce6719b6fb47f9fdc37
> BUG: 1336508
> Reviewed-on: http://review.gluster.org/14694
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

BUG: 1354395
Change-Id: Ibdbbae508d9dda2fd36220a9b1e47f7776336929
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: http://review.gluster.org/14891
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: N Balachandran <nbalacha@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

3 files changed, 42 insertions, 1 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 09dfd450102..9a5f90b02f1 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -3554,6 +3554,36 @@ gf_thread_create (pthread_t *thread, const pthread_attr_t *attr,
 }
 
 int
+gf_thread_create_detached (pthread_t *thread,
+                         void *(*start_routine)(void *), void *arg)
+{
+        pthread_attr_t attr;
+        int ret = -1;
+
+        ret = pthread_attr_init (&attr);
+        if (ret) {
+                gf_msg (THIS->name, GF_LOG_ERROR, ret,
+                        LG_MSG_PTHREAD_ATTR_INIT_FAILED,
+                        "Thread attribute initialization failed");
+                return -1;
+        }
+
+        pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
+
+        ret = gf_thread_create (thread, &attr, start_routine, arg);
+        if (ret) {
+                gf_msg (THIS->name, GF_LOG_ERROR, ret,
+                        LG_MSG_PTHREAD_FAILED,
+                        "Thread creation failed");
+                ret = -1;
+        }
+
+        pthread_attr_destroy (&attr);
+
+        return ret;
+}
+
+int
 gf_skip_header_section (int fd, int header_len)
 {
         int  ret           = -1;
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 858e574dd4c..f1c26a2d0c5 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -767,6 +767,9 @@ int gf_set_timestamp  (const char *src, const char* dest);
 
 int gf_thread_create (pthread_t *thread, const pthread_attr_t *attr,
                       void *(*start_routine)(void *), void *arg);
+int gf_thread_create_detached (pthread_t *thread,
+                      void *(*start_routine)(void *), void *arg);
+
 gf_boolean_t
 gf_is_service_running (char *pidfile, int *pid);
 int
diff --git a/libglusterfs/src/libglusterfs-messages.h b/libglusterfs/src/libglusterfs-messages.h
index c0bcabac798..d18f4cb3112 100644
--- a/libglusterfs/src/libglusterfs-messages.h
+++ b/libglusterfs/src/libglusterfs-messages.h
@@ -36,7 +36,7 @@
  */
 
 #define GLFS_LG_BASE            GLFS_MSGID_COMP_LIBGLUSTERFS
-#define GLFS_LG_NUM_MESSAGES    205
+#define GLFS_LG_NUM_MESSAGES    206
 #define GLFS_LG_MSGID_END       (GLFS_LG_BASE + GLFS_LG_NUM_MESSAGES + 1)
 /* Messaged with message IDs */
 #define glfs_msg_start_lg GLFS_LG_BASE, "Invalid: Start of messages"
@@ -1754,6 +1754,14 @@
  * @recommendedaction
  *
  */
+#define LG_MSG_PTHREAD_ATTR_INIT_FAILED                  (GLFS_LG_BASE + 206)
+
+/*!
+ * @messageid
+ * @diagnosis
+ * @recommendedaction
+ *
+ */
 /*------------*/
 
 #define glfs_msg_end_lg GLFS_LG_MSGID_END, "Invalid: End of messages"