1 files changed, 77 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/mutex_trylock.c b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/mutex_trylock.c
new file mode 100644
index 0000000000..99ba7a13da
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/mutex_trylock.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <inline-syscall.h>
+#include <pthreadP.h>
+#include <synch.h>
+#include <errno.h>
+#include <synchP.h>
+
+DECLARE_INLINE_SYSCALL (int, lwp_mutex_trylock, mutex_t *lp);
+
+extern int __mutex_lock_fast (mutex_t *mutex, bool try);
+
+
+int mutex_trylock (mutex)
+      mutex_t *mutex;
+{
+  /* Handle inconsistent robust mutexes.  */
+  if ((mutex->mutex_type & LOCK_ROBUST) &&
+      (mutex->mutex_flag & LOCK_NOTRECOVERABLE))
+    return ENOTRECOVERABLE;
+
+  /* Always hit the kernel for priority inherit locks.  */
+  if ((mutex->mutex_type & LOCK_PRIO_INHERIT) == 0)
+    {
+      int result = __mutex_lock_fast (mutex, true);
+      if(result >= 0)
+        return result;
+    }
+  else
+    {
+      /* Except when we already hold a recursive lock.  */
+      if ((mutex->mutex_type & LOCK_RECURSIVE) && MUTEX_IS_OWNER (mutex) &&
+           mutex->mutex_rcount > 0)
+        {
+          if (mutex->mutex_rcount == RECURSION_MAX)
+            return EAGAIN;
+          ++mutex->mutex_rcount;
+          return 0;
+        }
+    }
+
+  int errval = INLINE_SYSCALL (lwp_mutex_trylock, 1, mutex);
+
+  /* The kernel sets EDEADLK for priority inherit mutexes.  */
+  if (mutex->mutex_type & LOCK_PRIO_INHERIT && errval == EDEADLK)
+    return EBUSY;
+  if (errval != 0 && errval != EOWNERDEAD)
+    return errval;
+
+  /* The kernel does not set mutex_owner so we set it here.  */
+  mutex->mutex_owner = THREAD_GETMEM (THREAD_SELF, tid);
+
+  /* The kernel does not set the lockbyte for priority inherit mutexes.  */
+  if (mutex->mutex_type & LOCK_PRIO_INHERIT)
+    mutex->mutex_lockbyte = 1;
+
+  return errval;
+}
+
+weak_alias (mutex_trylock, _lwp_mutex_trylock)