From: Ivan Maidanski <ivmai@mail.ru>
Date: Tue, 28 Nov 2017 19:11:15 +0000 (+0300)
Subject: Define AO_TS_SET to true (1) if GCC atomic_test_and_set is used
X-Git-Tag: v7.6.2~43
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e8d559f5be67befec44c839809b2941295c03988;p=libatomic_ops

Define AO_TS_SET to true (1) if GCC atomic_test_and_set is used
(fix commit 3315a03)

According to GCC manual about the built-in functions for memory model
aware atomic operations, __atomic_test_and_set returns bool value;
bool true is encoded as 1.

* src/atomic_ops/sysdeps/test_and_set_t_is_char.h [AO_PREFER_GENERALIZED
|| !__GCC_ATOMIC_TEST_AND_SET_TRUEVAL] (AO_TS_SET_TRUEVAL): Define to 1
(instead of 0xff).
---

diff --git a/src/atomic_ops/sysdeps/test_and_set_t_is_char.h b/src/atomic_ops/sysdeps/test_and_set_t_is_char.h
index 75df9c0..9eb250c 100644
--- a/src/atomic_ops/sysdeps/test_and_set_t_is_char.h
+++ b/src/atomic_ops/sysdeps/test_and_set_t_is_char.h
@@ -26,11 +26,13 @@
  * all zeroes, and the "set" value contains all ones typically.
  */
 
-#if defined(AO_GCC_ATOMIC_TEST_AND_SET) && !defined(AO_PREFER_GENERALIZED) \
-    && defined(__GCC_ATOMIC_TEST_AND_SET_TRUEVAL)
+#ifndef AO_GCC_ATOMIC_TEST_AND_SET
+# define AO_TS_SET_TRUEVAL 0xff
+#elif defined(__GCC_ATOMIC_TEST_AND_SET_TRUEVAL) \
+      && !defined(AO_PREFER_GENERALIZED)
 # define AO_TS_SET_TRUEVAL __GCC_ATOMIC_TEST_AND_SET_TRUEVAL
 #else
-# define AO_TS_SET_TRUEVAL 0xff
+# define AO_TS_SET_TRUEVAL 1 /* true */
 #endif
 
 typedef enum {