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SERVER-12064 SERVER-12283 Use gcc atomic builtins if available

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Switch to using gcc atomic builtins for atomic operations if using a new
enough gcc and clang and support is available. Otherwise, fall back to
the old behaviour of existing non-portable inline assembly to continue
to support builds on older versions of gcc.

Signed-off-by: Benety Goh <benety@mongodb.com>
This commit is contained in:
Robie Basak 2013-12-13 15:52:07 +00:00 committed by Benety Goh
parent 677bd638dd
commit 19cceceb78
2 changed files with 28 additions and 2 deletions
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24
SConstruct
View File

@ -1431,6 +1431,30 @@ def doConfigure(myenv):
if haveUUThread:
myenv.Append(CPPDEFINES=['MONGO_HAVE___THREAD'])
if using_gcc() or using_clang():
def CheckGCCAtomicBuiltins(context):
test_body = """
int main(int argc, char **argv) {
int a = 0;
int b = 0;
int c = 0;
__atomic_compare_exchange(&a, &b, &c, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
return 0;
}
"""
context.Message('Checking for gcc atomic builtins... ')
ret = context.TryLink(textwrap.dedent(test_body), '.cpp')
context.Result(ret)
return ret
conf = Configure(myenv, help=False, custom_tests = {
'CheckGCCAtomicBuiltins': CheckGCCAtomicBuiltins,
})
haveGCCAtomicBuiltins = conf.CheckGCCAtomicBuiltins()
conf.Finish()
if haveGCCAtomicBuiltins:
conf.env.Append(CPPDEFINES=["HAVE_GCC_ATOMIC_BUILTINS"])
conf = Configure(myenv)
libdeps.setup_conftests(conf)

6
src/mongo/platform/atomic_intrinsics.h
View File

@ -43,10 +43,12 @@
#if defined(_WIN32)
#include "mongo/platform/atomic_intrinsics_win32.h"
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
#if defined(HAVE_GCC_ATOMIC_BUILTINS)
#include "mongo/platform/atomic_intrinsics_gcc_generic.h"
#elif defined(__i386__) || defined(__x86_64__)
#include "mongo/platform/atomic_intrinsics_gcc_intel.h"
#else
#include "mongo/platform/atomic_intrinsics_gcc_generic.h"
#error "Unsupported platform: no gcc atomic builtins or port available"
#endif
#else
#error "Unsupported os/compiler family"