From: Derrick Brashear <shadow@your-file-system.com>
Date: Mon, 21 Jan 2013 21:13:56 +0000 (-0500)
Subject: rx: convert rxinit_status to atomic
X-Git-Tag: openafs-stable-1_8_0pre1~1617
X-Git-Url: https://git.openafs.org/?p=openafs.git;a=commitdiff_plain;h=17986a100e19992dc21b1b517d274857c1fc6984

rx: convert rxinit_status to atomic

we don't need to use a lock just for this; switch to atomic and use that
to trigger configuration.

Change-Id: Ia96ec308dda51d1f6d13f290a23251c66665e499
Reviewed-on: http://gerrit.openafs.org/8930
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
---

diff --git a/src/rx/rx.c b/src/rx/rx.c
index 2e30dfc..5113ac5 100644
--- a/src/rx/rx.c
+++ b/src/rx/rx.c
@@ -478,19 +478,7 @@ rx_SetEpoch(afs_uint32 epoch)
 #ifndef AFS_NT40_ENV
 static
 #endif
-int rxinit_status = 1;
-#ifdef AFS_PTHREAD_ENV
-/*
- * This mutex protects the following global variables:
- * rxinit_status
- */
-
-#define LOCK_RX_INIT MUTEX_ENTER(&rx_init_mutex)
-#define UNLOCK_RX_INIT MUTEX_EXIT(&rx_init_mutex)
-#else
-#define LOCK_RX_INIT
-#define UNLOCK_RX_INIT
-#endif
+rx_atomic_t rxinit_status = RX_ATOMIC_INIT(1);
 
 int
 rx_InitHost(u_int host, u_int port)
@@ -501,17 +489,13 @@ rx_InitHost(u_int host, u_int port)
     struct timeval tv;
 #endif /* KERNEL */
     char *htable, *ptable;
-    int tmp_status;
 
     SPLVAR;
 
     INIT_PTHREAD_LOCKS;
-    LOCK_RX_INIT;
-    if (rxinit_status == 0) {
-	tmp_status = rxinit_status;
-	UNLOCK_RX_INIT;
-	return tmp_status;	/* Already started; return previous error code. */
-    }
+    if (!rx_atomic_test_and_clear_bit(&rxinit_status, 0))
+	return 0; /* already started */
+
 #ifdef RXDEBUG
     rxi_DebugInit();
 #endif
@@ -533,7 +517,6 @@ rx_InitHost(u_int host, u_int port)
 
     rx_socket = rxi_GetHostUDPSocket(host, (u_short) port);
     if (rx_socket == OSI_NULLSOCKET) {
-	UNLOCK_RX_INIT;
 	return RX_ADDRINUSE;
     }
 #if defined(RX_ENABLE_LOCKS) && defined(KERNEL)
@@ -663,9 +646,8 @@ rx_InitHost(u_int host, u_int port)
 #endif
 
     USERPRI;
-    tmp_status = rxinit_status = 0;
-    UNLOCK_RX_INIT;
-    return tmp_status;
+    rx_atomic_clear_bit(&rxinit_status, 0);
+    return 0;
 }
 
 int
@@ -815,7 +797,7 @@ rx_rto_setPeerTimeoutSecs(struct rx_peer *peer, int secs) {
 void
 rx_SetBusyChannelError(afs_int32 onoff)
 {
-    osi_Assert(rxinit_status != 0);
+    osi_Assert(rx_atomic_test_bit(&rxinit_status, 0));
     rxi_busyChannelError = onoff ? 1 : 0;
 }
 
@@ -2550,11 +2532,9 @@ rx_Finalize(void)
     struct rx_connection **conn_ptr, **conn_end;
 
     INIT_PTHREAD_LOCKS;
-    LOCK_RX_INIT;
-    if (rxinit_status == 1) {
-	UNLOCK_RX_INIT;
+    if (rx_atomic_test_and_set_bit(&rxinit_status, 0))
 	return;			/* Already shutdown. */
-    }
+
     rxi_DeleteCachedConnections();
     if (rx_connHashTable) {
 	MUTEX_ENTER(&rx_connHashTable_lock);
@@ -2594,8 +2574,6 @@ rx_Finalize(void)
     afs_winsockCleanup();
 #endif
 
-    rxinit_status = 1;
-    UNLOCK_RX_INIT;
 }
 #endif
 
@@ -7934,11 +7912,9 @@ shutdown_rx(void)
     struct rx_serverQueueEntry *sq;
 #endif /* KERNEL */
 
-    LOCK_RX_INIT;
-    if (rxinit_status == 1) {
-	UNLOCK_RX_INIT;
+    if (rx_atomic_test_and_set_bit(&rxinit_status, 0))
 	return;			/* Already shutdown. */
-    }
+
 #ifndef KERNEL
     rx_port = 0;
 #ifndef AFS_PTHREAD_ENV
@@ -8062,8 +8038,6 @@ shutdown_rx(void)
     rxi_dataQuota = RX_MAX_QUOTA;
     rxi_availProcs = rxi_totalMin = rxi_minDeficit = 0;
     MUTEX_EXIT(&rx_quota_mutex);
-    rxinit_status = 1;
-    UNLOCK_RX_INIT;
 }
 
 #ifndef KERNEL
diff --git a/src/rx/rx_user.c b/src/rx/rx_user.c
index da265af..942829b 100644
--- a/src/rx/rx_user.c
+++ b/src/rx/rx_user.c
@@ -351,7 +351,7 @@ rx_getAllAddrMaskMtu(afs_uint32 addrBuffer[], afs_uint32 maskBuffer[],
 #endif
 
 #ifdef AFS_NT40_ENV
-extern int rxinit_status;
+extern rx_atomic_t rxinit_status;
 void
 rxi_InitMorePackets(void) {
     int npackets, ncbufs;
@@ -372,7 +372,7 @@ rx_GetIFInfo(void)
 
     LOCK_IF_INIT;
     if (Inited) {
-        if (Inited < 2 && rxinit_status == 0) {
+	if (Inited < 2 && !rx_atomic_test_bit(&rxinit_status, 0)) {
             /* We couldn't initialize more packets earlier.
              * Do it now. */
             rxi_InitMorePackets();
@@ -410,7 +410,7 @@ rx_GetIFInfo(void)
      * and we therefore do not have any mutex locks initialized.  As a
      * result we cannot call rxi_MorePackets() without crashing.
      */
-    if (rxinit_status)
+    if (rx_atomic_test_bit(&rxinit_status, 0))
         return;
 
     rxi_InitMorePackets();