Fixed pthread_spin_lock on sparc32/64 (bug 16882)release/2.16/master

	[BZ #16882]
	* nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S
	(pthread_spin_lock): Branch out of spin loop to proper location.
	* nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S
	(pthread_spin_lock): Likewise.

	* nptl/tst-spin4.c: New test.
	* nptl/Makefile (tests): Add tst-spin4.

6 files changed, 126 insertions, 6 deletions

diff --git a/ChangeLog b/ChangeLog
index 16ff227..aa09ea1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2014-06-03  Guo Yixuan  <culu.gyx@gmail.com>
+
+	[BZ #16882]
+	* nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S
+	(pthread_spin_lock): Branch out of spin loop to proper location.
+	* nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S
+	(pthread_spin_lock): Likewise.
+
+	* nptl/tst-spin4.c: New test.
+	* nptl/Makefile (tests): Add tst-spin4.
+
 2014-05-16  Aurelien Jarno  <aurelien@aurel32.net>
 
 	[BZ #16943]
diff --git a/NEWS b/NEWS
index 8702a3a..2ffc962 100644
--- a/NEWS
+++ b/NEWS
@@ -38,7 +38,7 @@ Version 2.16
   14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
   14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
   14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
-  14277, 14278
+  14277, 14278, 16882
 
 * Support for the x32 ABI on x86-64 added.  The x32 target is selected by
   configuring glibc with:
diff --git a/nptl/Makefile b/nptl/Makefile
index ef8e874..1a9a676 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -202,7 +202,7 @@ tests = tst-typesizes \
 	tst-mutexpi1 tst-mutexpi2 tst-mutexpi3 tst-mutexpi4 tst-mutexpi5 \
 	tst-mutexpi5a tst-mutexpi6 tst-mutexpi7 tst-mutexpi7a tst-mutexpi8 \
 	tst-mutexpi9 \
-	tst-spin1 tst-spin2 tst-spin3 \
+	tst-spin1 tst-spin2 tst-spin3 tst-spin4 \
 	tst-cond1 tst-cond2 tst-cond3 tst-cond4 tst-cond5 tst-cond6 tst-cond7 \
 	tst-cond8 tst-cond9 tst-cond10 tst-cond11 tst-cond12 tst-cond13 \
 	tst-cond14 tst-cond15 tst-cond16 tst-cond17 tst-cond18 tst-cond19 \
diff --git a/nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S b/nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S
index 3155121..703dbca 100644
--- a/nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S
+++ b/nptl/sysdeps/sparc/sparc32/pthread_spin_lock.S
@@ -19,11 +19,11 @@
 
 	.text
 ENTRY(pthread_spin_lock)
-	ldstub		[%o0], %g1
+1:	ldstub		[%o0], %g1
 	orcc		%g1, 0x0, %g0
 	bne,a		2f
 	 ldub		[%o0], %g1
-1:	retl
+	retl
 	 mov		0, %o0
 2:	orcc		%g1, 0x0, %g0
 	bne,a		2b
diff --git a/nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S b/nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S
index cd3b01f..d52c4a6 100644
--- a/nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S
+++ b/nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S
@@ -19,10 +19,10 @@
 
 	.text
 ENTRY(pthread_spin_lock)
-	ldstub		[%o0], %g1
+1:	ldstub		[%o0], %g1
 	brnz,pn		%g1, 2f
 	 membar		#StoreLoad | #StoreStore
-1:	retl
+	retl
 	 mov		0, %o0
 2:	ldub		[%o0], %g1
 	brnz,pt		%g1, 2b
diff --git a/nptl/tst-spin4.c b/nptl/tst-spin4.c
new file mode 100644
index 0000000..5b23a17
--- /dev/null
+++ b/nptl/tst-spin4.c
@@ -0,0 +1,109 @@
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static int count = 0;
+
+static void *
+thread_add_one (void *arg)
+{
+  int tmp;
+  pthread_spinlock_t *lock = (pthread_spinlock_t *) arg;
+
+  /* When do_test holds the lock for 1 sec, the two thread will be
+     in contention for the lock. */
+  if (pthread_spin_lock (lock) != 0)
+    {
+      puts ("thread_add_one(): spin_lock failed");
+      pthread_exit ((void *) 1l);
+    }
+
+  /* sleep 1s before modifying count */
+  tmp = count;
+  sleep (1);
+  count = tmp + 1;
+
+  if (pthread_spin_unlock (lock) != 0)
+    {
+      puts ("thread_add_one(): spin_unlock failed");
+      pthread_exit ((void *) 1l);
+    }
+
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  pthread_t thr1, thr2;
+  pthread_spinlock_t lock;
+  int tmp;
+
+  if (pthread_spin_init (&lock, PTHREAD_PROCESS_PRIVATE) != 0)
+    {
+      puts ("spin_init failed");
+      return 1;
+    }
+
+  if (pthread_spin_lock (&lock) != 0)
+    {
+      puts ("1st spin_lock failed");
+      return 1;
+    }
+
+  if (pthread_create (&thr1, NULL, thread_add_one, (void *) &lock) != 0)
+    {
+      puts ("1st pthread_create failed");
+      return 1;
+    }
+
+  if (pthread_create (&thr2, NULL, thread_add_one, (void *) &lock) != 0)
+    {
+      puts ("2nd pthread_create failed");
+      return 1;
+    }
+
+  /* sleep 1s before modifying count */
+  tmp = count;
+  sleep (1);
+  count = tmp + 1;
+
+  if (pthread_spin_unlock (&lock) != 0)
+    {
+      puts ("1st spin_unlock failed");
+      return 1;
+    }
+
+  void *status;
+  if (pthread_join (thr1, &status) != 0)
+    {
+      puts ("1st pthread_join failed");
+      return 1;
+    }
+  if (status != NULL)
+    {
+      puts ("failure in the 1st thread");
+      return 1;
+    }
+  if (pthread_join (thr2, &status) != 0)
+    {
+      puts ("2nd pthread_join failed");
+      return 1;
+    }
+  if (status != NULL)
+    {
+      puts ("failure in the 2nd thread");
+      return 1;
+    }
+
+  if (count != 3)
+    {
+      printf ("count is %d, should be 3\n", count);
+      return 1;
+    }
+  return 0;
+}
+
+#define TIMEOUT 5
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"