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Still working on the basic design of <atomic>. I'm working towards a system by which the compiler only needs to define the strongest intrinsics it can. Weaker atomics in the library automatically try stronger and stronger variants, picking the weakest compiler intrinsic available. If no compiler intrinsics are available for a given operation, the library locks a mutex and does the job. Better documentation to follow... 

llvm-svn: 115538
This commit is contained in:
Howard Hinnant 2010-10-04 18:52:54 +00:00
parent b2c4ca6433
commit 2b672e24a5
4 changed files with 1213 additions and 118 deletions
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1284
libcxx/include/atomic
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23
libcxx/src/atomic.cpp Normal file
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@ -0,0 +1,23 @@
//===------------------------- atomic.cpp ---------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "__mutex_base"
#include "atomic"
_LIBCPP_BEGIN_NAMESPACE_STD
_LIBCPP_VISIBLE
mutex&
__not_atomic_mut()
{
static mutex m;
return m;
}
_LIBCPP_END_NAMESPACE_STD

12
libcxx/test/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp
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@ -25,12 +25,6 @@ int main()
atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.test_and_set();
atomic_flag_clear_explicit(&f, std::memory_order_consume);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.test_and_set();
@ -49,12 +43,6 @@ int main()
atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.test_and_set();
atomic_flag_clear_explicit(&f, std::memory_order_consume);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.test_and_set();

12
libcxx/test/atomics/atomics.flag/clear.pass.cpp
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@ -31,12 +31,6 @@ int main()
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.test_and_set();
f.clear(std::memory_order_consume);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.test_and_set();
@ -61,12 +55,6 @@ int main()
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.test_and_set();
f.clear(std::memory_order_consume);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.test_and_set();