IRIX spinlock patch from James Peach <jpeach@sgi.com>.

Jeremy.
(This used to be commit 1ae1987a002716e8aa0d4bc0dd68f580ad762e47)

1 files changed, 45 insertions, 0 deletions

diff --git a/source3/tdb/spinlock.c b/source3/tdb/spinlock.c
index 3fddeafb2c..3b3ebefded 100644
--- a/source3/tdb/spinlock.c
+++ b/source3/tdb/spinlock.c
@@ -143,6 +143,47 @@ static inline int __spin_is_locked(spinlock_t *lock)
 	return (*lock != 1);
 }
 
+#elif defined(MIPS_SPINLOCKS) && defined(sgi) && (_COMPILER_VERSION >= 730)
+
+/* Implement spinlocks on IRIX using the MIPSPro atomic fetch operations. See
+ * sync(3) for the details of the intrinsic operations.
+ *
+ * "sgi" and "_COMPILER_VERSION" are always defined by MIPSPro.
+ */
+
+#if defined(STANDALONE)
+
+/* MIPSPro 7.3 has "__inline" as an extension, but not "inline. */
+#define inline __inline
+
+#endif /* STANDALONE */
+
+/* Returns 0 if the lock is acquired, EBUSY otherwise. */
+static inline int __spin_trylock(spinlock_t *lock)
+{
+        unsigned int val;
+        val = __lock_test_and_set(lock, 1);
+        return val == 0 ? 0 : EBUSY;
+}
+
+static inline void __spin_unlock(spinlock_t *lock)
+{
+        __lock_release(lock);
+}
+
+static inline void __spin_lock_init(spinlock_t *lock)
+{
+        __lock_release(lock);
+}
+
+/* Returns 1 if the lock is held, 0 otherwise. */
+static inline int __spin_is_locked(spinlock_t *lock)
+{
+        unsigned int val;
+        val = __add_and_fetch(lock, 0);
+	return val;
+}
+
 #elif defined(MIPS_SPINLOCKS) 
 
 static inline unsigned int load_linked(unsigned long addr)
@@ -221,7 +262,11 @@ static void yield_cpu(void)
 
 static int this_is_smp(void)
 {
+#if defined(HAVE_SYSCONF) && defined(SYSCONF_SC_NPROC_ONLN)
+        return (sysconf(_SC_NPROC_ONLN) > 1) ? 1 : 0;
+#else
 	return 0;
+#endif
 }
 
 /*