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* include/bits/atomic_futex.h [_GLIBCXX_HAVE_LINUX_FUTEX]

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(_M_load_and_test_until): Whitespace.
	(_M_load_and_test): Value-initialize the unused durations.
	(_M_load_when_equal): Add missing return value.

From-SVN: r226174
This commit is contained in:
Jonathan Wakely 2015-07-24 17:30:04 +01:00 • committed by Jonathan Wakely
parent 776280c4a8
commit fa0ed2b062
2 changed files with 15 additions and 7 deletions
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7
libstdc++-v3/ChangeLog
View file

@ -1,3 +1,10 @@
2015-07-24 Jonathan Wakely <jwakely@redhat.com>
* include/bits/atomic_futex.h [_GLIBCXX_HAVE_LINUX_FUTEX]
(_M_load_and_test_until): Whitespace.
(_M_load_and_test): Value-initialize the unused durations.
(_M_load_when_equal): Add missing return value.
2015-07-24 Michael Haubenwallner <michael.haubenwallner@ssi-schaefer.com>
* fragment.am (AM_CPPFLAGS): Add CPPFLAGS.

15
libstdc++-v3/include/bits/atomic_futex.h
View file

@ -93,15 +93,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
for (;;)
{
// Don't bother checking the value again because we expect the caller to
// have done it recently.
// Don't bother checking the value again because we expect the caller
// to have done it recently.
// memory_order_relaxed is sufficient because we can rely on just the
// modification order (store_notify uses an atomic RMW operation too),
// and the futex syscalls synchronize between themselves.
_M_data.fetch_or(_Waiter_bit, memory_order_relaxed);
bool __ret;
__ret = _M_futex_wait_until((unsigned*)(void*)&_M_data,
__assumed | _Waiter_bit, __has_timeout, __s, __ns);
bool __ret = _M_futex_wait_until((unsigned*)(void*)&_M_data,
__assumed | _Waiter_bit,
__has_timeout, __s, __ns);
// Fetch the current value after waiting (clears _Waiter_bit).
__assumed = _M_load(__mo);
if (!__ret || ((__operand == __assumed) == __equal))
@ -119,7 +119,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
bool __equal, memory_order __mo)
{
return _M_load_and_test_until(__assumed, __operand, __equal, __mo,
false, chrono::seconds(0), chrono::nanoseconds(0));
false, {}, {});
}
// If a timeout occurs, returns a current value after the timeout;
@ -146,7 +146,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_load_when_not_equal(unsigned __val, memory_order __mo)
{
unsigned __i = _M_load(__mo);
if ((__i & ~_Waiter_bit) != __val) return;
if ((__i & ~_Waiter_bit) != __val)
return (__i & ~_Waiter_bit);
// TODO Spin-wait first.
return _M_load_and_test(__i, __val, false, __mo);
}