[ovs-dev] [rwlock 1/5] ofproto-dpif-monitor: Change global rwlock into mutex.

[Ben Pfaff]

Nothing ever took monitor_rwlock's read lock, so it might as well be a
mutex.

Signed-off-by: Ben Pfaff <blp at nicira.com>
---
 ofproto/ofproto-dpif-monitor.c |   34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/ofproto/ofproto-dpif-monitor.c b/ofproto/ofproto-dpif-monitor.c
index 33115f3..b521735 100644
--- a/ofproto/ofproto-dpif-monitor.c
+++ b/ofproto/ofproto-dpif-monitor.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -64,25 +64,25 @@ static pthread_t monitor_tid;
 static bool monitor_running;
 
 static struct latch monitor_exit_latch;
-static struct ovs_rwlock monitor_rwlock = OVS_RWLOCK_INITIALIZER;
+static struct ovs_mutex monitor_mutex = OVS_MUTEX_INITIALIZER;
 
 static void *monitor_main(void *);
 static void monitor_run(void);
 
 static void mport_register(const struct ofport_dpif *, struct bfd *,
                            struct cfm *, uint8_t[ETH_ADDR_LEN])
-    OVS_REQ_WRLOCK(monitor_rwlock);
+    OVS_REQUIRES(monitor_mutex);
 static void mport_unregister(const struct ofport_dpif *)
-    OVS_REQ_WRLOCK(monitor_rwlock);
+    OVS_REQUIRES(monitor_mutex);
 static void mport_update(struct mport *, struct bfd *, struct cfm *,
-                         uint8_t[ETH_ADDR_LEN]) OVS_REQ_WRLOCK(monitor_rwlock);
+                         uint8_t[ETH_ADDR_LEN]) OVS_REQUIRES(monitor_mutex);
 static struct mport *mport_find(const struct ofport_dpif *)
-    OVS_REQ_WRLOCK(monitor_rwlock);
+    OVS_REQUIRES(monitor_mutex);
 
 /* Tries finding and returning the 'mport' from the monitor_hmap.
  * If there is no such 'mport', returns NULL. */
 static struct mport *
-mport_find(const struct ofport_dpif *ofport) OVS_REQ_WRLOCK(monitor_rwlock)
+mport_find(const struct ofport_dpif *ofport) OVS_REQUIRES(monitor_mutex)
 {
     struct mport *node;
 
@@ -100,7 +100,7 @@ mport_find(const struct ofport_dpif *ofport) OVS_REQ_WRLOCK(monitor_rwlock)
 static void
 mport_register(const struct ofport_dpif *ofport, struct bfd *bfd,
                struct cfm *cfm, uint8_t *hw_addr)
-    OVS_REQ_WRLOCK(monitor_rwlock)
+    OVS_REQUIRES(monitor_mutex)
 {
     struct mport *mport = mport_find(ofport);
 
@@ -116,7 +116,7 @@ mport_register(const struct ofport_dpif *ofport, struct bfd *bfd,
 /* Removes mport from monitor_hmap and monitor_heap and frees it. */
 static void
 mport_unregister(const struct ofport_dpif *ofport)
-    OVS_REQ_WRLOCK(monitor_rwlock)
+    OVS_REQUIRES(monitor_mutex)
 {
     struct mport *mport = mport_find(ofport);
 
@@ -131,7 +131,7 @@ mport_unregister(const struct ofport_dpif *ofport)
 /* Updates the fields of an existing mport struct. */
 static void
 mport_update(struct mport *mport, struct bfd *bfd, struct cfm *cfm,
-             uint8_t hw_addr[ETH_ADDR_LEN]) OVS_REQ_WRLOCK(monitor_rwlock)
+             uint8_t hw_addr[ETH_ADDR_LEN]) OVS_REQUIRES(monitor_mutex)
 {
     ovs_assert(mport);
 
@@ -184,7 +184,7 @@ monitor_run(void)
     struct ofpbuf packet;
 
     ofpbuf_use_stub(&packet, stub, sizeof stub);
-    ovs_rwlock_wrlock(&monitor_rwlock);
+    ovs_mutex_lock(&monitor_mutex);
     prio_now = MSEC_TO_PRIO(time_msec());
     /* Peeks the top of heap and checks if we should run this mport. */
     while (!heap_is_empty(&monitor_heap)
@@ -226,7 +226,7 @@ monitor_run(void)
         next_mport_wakeup = PRIO_TO_MSEC(heap_max(&monitor_heap)->priority);
         poll_timer_wait_until(MIN(next_timeout, next_mport_wakeup));
     }
-    ovs_rwlock_unlock(&monitor_rwlock);
+    ovs_mutex_unlock(&monitor_mutex);
     ofpbuf_uninit(&packet);
 }
 
@@ -240,13 +240,13 @@ ofproto_dpif_monitor_port_update(const struct ofport_dpif *ofport,
                                  struct bfd *bfd, struct cfm *cfm,
                                  uint8_t hw_addr[ETH_ADDR_LEN])
 {
-    ovs_rwlock_wrlock(&monitor_rwlock);
+    ovs_mutex_lock(&monitor_mutex);
     if (!cfm && !bfd) {
         mport_unregister(ofport);
     } else {
         mport_register(ofport, bfd, cfm, hw_addr);
     }
-    ovs_rwlock_unlock(&monitor_rwlock);
+    ovs_mutex_unlock(&monitor_mutex);
 
     /* If the monitor thread is not running and the hmap
      * is not empty, starts it.  If it is and the hmap is empty,
@@ -269,14 +269,14 @@ ofproto_dpif_monitor_port_update(const struct ofport_dpif *ofport,
 void
 ofproto_dpif_monitor_port_send_soon_safe(const struct ofport_dpif *ofport)
 {
-    ovs_rwlock_wrlock(&monitor_rwlock);
+    ovs_mutex_lock(&monitor_mutex);
     ofproto_dpif_monitor_port_send_soon(ofport);
-    ovs_rwlock_unlock(&monitor_rwlock);
+    ovs_mutex_unlock(&monitor_mutex);
 }
 
 void
 ofproto_dpif_monitor_port_send_soon(const struct ofport_dpif *ofport)
-    OVS_REQ_WRLOCK(monitor_rwlock)
+    OVS_REQUIRES(monitor_mutex)
 {
     struct mport *mport;
 
-- 
1.7.10.4