src/sys/kern/kern_mutex.c - diff

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-version 1.64, 2017/01/26 04:11:56
+version 1.64.4.1, 2017/04/30 04:56:55
 Line 831  mutex_owner(kmutex_t *mtx)
 Line 831  mutex_owner(kmutex_t *mtx)
 Line 831  mutex_owner(kmutex_t *mtx)
  }
  /*
+  * mutex_ownable:
+  *
+  *      When compiled with LOCKDEBUG defined, ensure that the
+  *      mutex is available.  We cannot use !mutex_owned()
+  *      since that won't work correctly for spin mutexes.
+  */
+ int
+ mutex_ownable(kmutex_t *mtx)
+ {
+ #ifdef LOCKDEBUG
+         mutex_enter(mtx);
+         mutex_exit(mtx);
+ #endif
+         return 1;
+ }
+ /*
   * mutex_tryenter:
   *
   *      Try to acquire the mutex; return non-zero if we did.