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PR libstdc++/51798 continued

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PR libstdc++/51798 continued
	* include/bits/shared_ptr_base.h
	(_Sp_counted_base<_S_atomic>::_M_add_ref_lock): Hoist initial load
	outside compare_exchange loop.
	* include/tr1/shared_ptr.h: Same.
	* include/parallel/compatibility.h (__compare_and_swap_32): Use strong
	version of compare_exchange.
	(__compare_and_swap_64): Same.
	* include/profile/impl/profiler_state.h (__gnu_profile::__turn): Same.
	* libsupc++/guard.cc (__cxa_guard_acquire): Same.

From-SVN: r184171
This commit is contained in:
Richard Henderson 2012-02-13 13:30:31 -08:00 committed by Richard Henderson
parent 67b977ada8
commit b2cb69647e
6 changed files with 29 additions and 16 deletions
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13
libstdc++-v3/ChangeLog
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@ -1,3 +1,16 @@
2012-02-13 Richard Henderson <rth@redhat.com>
PR libstdc++/51798 continued.
* include/bits/shared_ptr_base.h
(_Sp_counted_base<_S_atomic>::_M_add_ref_lock): Hoist initial load
outside compare_exchange loop.
* include/tr1/shared_ptr.h: Same.
* include/parallel/compatibility.h (__compare_and_swap_32): Use strong
version of compare_exchange.
(__compare_and_swap_64): Same.
* include/profile/impl/profiler_state.h (__gnu_profile::__turn): Same.
* libsupc++/guard.cc (__cxa_guard_acquire): Same.
2012-02-10 Benjamin Kosnik <bkoz@redhat.com>
Jonathan Wakely <jwakely.gcc@gmail.com>

4
libstdc++-v3/include/bits/shared_ptr_base.h
View File

@ -236,13 +236,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_add_ref_lock()
{
// Perform lock-free add-if-not-zero operation.
_Atomic_word __count;
_Atomic_word __count = _M_use_count;
do
{
__count = _M_use_count;
if (__count == 0)
__throw_bad_weak_ptr();
// Replace the current counter value with the old value + 1, as
// long as it's not changed meanwhile.
}

15
libstdc++-v3/include/parallel/compatibility.h
View File

@ -252,8 +252,9 @@ namespace __gnu_parallel
__replacement, __comparand)
== __comparand;
#elif defined(__GNUC__)
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement, true,
__ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement,
false, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
#elif defined(__SUNPRO_CC) && defined(__sparc)
return atomic_cas_32((volatile unsigned int*)__ptr, __comparand,
__replacement) == __comparand;
@ -299,13 +300,15 @@ namespace __gnu_parallel
#endif
#elif defined(__GNUC__) && defined(__x86_64)
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement, true,
__ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement,
false, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
#elif defined(__GNUC__) && defined(__i386) && \
(defined(__i686) || defined(__pentium4) || defined(__athlon) \
|| defined(__k8) || defined(__core2))
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement, true,
__ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
return __atomic_compare_exchange_n(__ptr, &__comparand, __replacement,
false, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
#elif defined(__SUNPRO_CC) && defined(__sparc)
return atomic_cas_64((volatile unsigned long long*)__ptr,
__comparand, __replacement) == __comparand;

2
libstdc++-v3/include/profile/impl/profiler_state.h
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@ -48,7 +48,7 @@ namespace __gnu_profile
{
__state_type inv(__INVALID);
return __atomic_compare_exchange_n(&_GLIBCXX_PROFILE_DATA(__state),
&inv, __s, true, __ATOMIC_ACQ_REL,
&inv, __s, false, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
}

4
libstdc++-v3/include/tr1/shared_ptr.h
View File

@ -237,13 +237,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_add_ref_lock()
{
// Perform lock-free add-if-not-zero operation.
_Atomic_word __count;
_Atomic_word __count = _M_use_count;
do
{
__count = _M_use_count;
if (__count == 0)
__throw_bad_weak_ptr();
// Replace the current counter value with the old value + 1, as
// long as it's not changed meanwhile.
}

7
libstdc++-v3/libsupc++/guard.cc
View File

@ -251,8 +251,9 @@ namespace __cxxabiv1
while (1)
{
if (__atomic_compare_exchange_n(gi, &expected, pending_bit, true,
__ATOMIC_ACQ_REL, __ATOMIC_RELAXED))
if (__atomic_compare_exchange_n(gi, &expected, pending_bit, false,
__ATOMIC_ACQ_REL,
__ATOMIC_RELAXED))
{
// This thread should do the initialization.
return 1;
@ -266,7 +267,7 @@ namespace __cxxabiv1
if (expected == pending_bit)
{
int newv = expected | waiting_bit;
if (!__atomic_compare_exchange_n(gi, &expected, newv, true,
if (!__atomic_compare_exchange_n(gi, &expected, newv, false,
__ATOMIC_ACQ_REL,
__ATOMIC_RELAXED))
continue;