This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[PATCH] fix parisc atomic locking builtins for libgomp

The attached patch fixes gcc's atomic locking builtins on parisc so that they can be used for libgomp with HAVE_SYNC_BUILTINS defined. Successfully tested with the libgomp testsuite.

2008-11-23 Helge Deller <>

	* pa/linux-atomic.c (EBUSY): Define if not _LP64.
	(__kernel_cmpxchg): Return -EBUSY if the kernel LWS call
	succeeded and lws_ret is not equal to oldval.

Index: config/pa/linux-atomic.c
--- config/pa/linux-atomic.c	(revision 142140)
+++ config/pa/linux-atomic.c	(working copy)
@@ -33,8 +33,9 @@
 #ifndef _LP64
 #include <errno.h>
+#define EFAULT  14
+#define EBUSY   16
 #define ENOSYS 251
-#define EFAULT 14

 /* All PA-RISC implementations supported by linux have strongly
@@ -74,6 +75,13 @@
   if (__builtin_expect (lws_errno == -EFAULT || lws_errno == -ENOSYS, 0))
+  /* If the kernel LWS call succeeded (lws_errno == 0), lws_ret contains
+     the old value from memory.  If this value is equal to OLDVAL, the
+     new value was written to memory.  If not, return -EBUSY.  */
+  if (!lws_errno && lws_ret != oldval)
+    lws_errno = -EBUSY;
   return lws_errno;

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]