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libstdc++: Use __GCC_ATOMIC_TEST_AND_SET in atomic_flag. 

* include/bits/atomic_base.h (__atomic_flag_base): Define _M_i
        based on the value of __GCC_ATOMIC_TEST_AND_SET_TRUEVAL.
        (ATOMIC_FLAG_INIT): Initialize with 0, not false.
        (atomic_flag::atomic_flag): Use __GCC_ATOMIC_TEST_AND_SET_TRUEVAL.

From-SVN: r183582
This commit is contained in:
Richard Henderson 2012-01-26 13:50:52 -08:00 committed by Richard Henderson
parent 57c5ab1ba6
commit e29137fe36
2 changed files with 16 additions and 2 deletions
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7
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,10 @@
2012-01-27 Richard Henderson <rth@redhat.com>
* include/bits/atomic_base.h (__atomic_flag_base): Define _M_i
based on the value of __GCC_ATOMIC_TEST_AND_SET_TRUEVAL.
(ATOMIC_FLAG_INIT): Initialize with 0, not false.
(atomic_flag::atomic_flag): Use __GCC_ATOMIC_TEST_AND_SET_TRUEVAL.
2012-01-26 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/51985

11
libstdc++-v3/include/bits/atomic_base.h
View File

@ -227,12 +227,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __atomic_flag_base
{
/* The target's "set" value for test-and-set may not be exactly 1. */
#if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1
bool _M_i;
#else
unsigned char _M_i;
#endif
};
_GLIBCXX_END_EXTERN_C
#define ATOMIC_FLAG_INIT { false }
#define ATOMIC_FLAG_INIT { 0 }
/// atomic_flag
struct atomic_flag : public __atomic_flag_base
@ -244,7 +249,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
atomic_flag& operator=(const atomic_flag&) volatile = delete;
// Conversion to ATOMIC_FLAG_INIT.
atomic_flag(bool __i) noexcept : __atomic_flag_base({ __i }) { }
constexpr atomic_flag(bool __i) noexcept
: __atomic_flag_base({ __i ? __GCC_ATOMIC_TEST_AND_SET_TRUEVAL : 0 })
{ }
bool
test_and_set(memory_order __m = memory_order_seq_cst) noexcept