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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...

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@115538 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2010-10-04 18:52:54 +00:00
parent 7c0c696afd
commit 611fdaf229
4 changed files with 1213 additions and 118 deletions
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1284
include/atomic
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File diff suppressed because it is too large Load Diff

23
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
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
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();