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# Check for availability of atomic operations
# This module defines
# OPENTHREADS_HAVE_ATOMIC_OPS
OPTION(OPENTHREADS_ATOMIC_USE_MUTEX "Set to ON to force OpenThreads to use a mutex for Atmoic." OFF)
IF (OPENTHREADS_ATOMIC_USE_MUTEX)
SET(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS 0)
SET(_OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS 0)
SET(_OPENTHREADS_ATOMIC_USE_SUN 0)
SET(_OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED 0)
SET(_OPENTHREADS_ATOMIC_USE_BSD_ATOMIC 0)
SET(_OPENTHREADS_ATOMIC_USE_MUTEX 1)
ELSE()
# as the test does not work for IOS hardcode the ATOMIC implementation
IF(OSG_BUILD_PLATFORM_IPHONE_SIMULATOR OR OSG_BUILD_PLATFORM_IPHONE)
SET(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS 0)
SET(_OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS 0)
SET(_OPENTHREADS_ATOMIC_USE_SUN 0)
SET(_OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED 0)
SET(_OPENTHREADS_ATOMIC_USE_MUTEX 0)
SET(_OPENTHREADS_ATOMIC_USE_BSD_ATOMIC 1)
ELSE()
INCLUDE(CheckCXXSourceRuns)
# Do step by step checking,
CHECK_CXX_SOURCE_RUNS("
#include <cstdlib>
int main()
{
unsigned value = 0;
void* ptr = &value;
__sync_add_and_fetch(&value, 1);
__sync_synchronize();
__sync_sub_and_fetch(&value, 1);
if (!__sync_bool_compare_and_swap(&value, 0, 1))
return EXIT_FAILURE;
if (!__sync_bool_compare_and_swap(&ptr, ptr, ptr))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
" _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS)
CHECK_CXX_SOURCE_RUNS("
#include <stdlib.h>
int main(int, const char**)
{
unsigned value = 0;
void* ptr = &value;
__add_and_fetch(&value, 1);
__synchronize(value);
__sub_and_fetch(&value, 1);
if (!__compare_and_swap(&value, 0, 1))
return EXIT_FAILURE;
if (!__compare_and_swap((unsigned long*)&ptr, (unsigned long)ptr, (unsigned long)ptr))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
" _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS)
CHECK_CXX_SOURCE_RUNS("
#include <atomic.h>
#include <cstdlib>
int main(int, const char**)
{
uint_t value = 0;
void* ptr = &value;
atomic_inc_uint_nv(&value);
membar_consumer();
atomic_dec_uint_nv(&value);
if (0 != atomic_cas_uint(&value, 0, 1))
return EXIT_FAILURE;
if (ptr != atomic_cas_ptr(&ptr, ptr, ptr))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
" _OPENTHREADS_ATOMIC_USE_SUN)
CHECK_CXX_SOURCE_RUNS("
#include <windows.h>
#include <intrin.h>
#include <cstdlib>
#pragma intrinsic(_InterlockedAnd)
#pragma intrinsic(_InterlockedOr)
#pragma intrinsic(_InterlockedXor)
int main(int, const char**)
{
volatile long value = 0;
long data = 0;
long* volatile ptr = &data;
InterlockedIncrement(&value);
MemoryBarrier();
InterlockedDecrement(&value);
if (0 != InterlockedCompareExchange(&value, 1, 0))
return EXIT_FAILURE;
if (ptr != InterlockedCompareExchangePointer((PVOID volatile*)&ptr, (PVOID)ptr, (PVOID)ptr))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
" _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED)
CHECK_CXX_SOURCE_RUNS("
#include <libkern/OSAtomic.h>
int main()
{
volatile int32_t value = 0;
long data = 0;
long * volatile ptr = &data;
OSAtomicIncrement32(&value);
OSMemoryBarrier();
OSAtomicDecrement32(&value);
OSAtomicCompareAndSwapInt(value, 1, &value);
OSAtomicCompareAndSwapPtr(ptr, ptr, (void * volatile *)&ptr);
}
" _OPENTHREADS_ATOMIC_USE_BSD_ATOMIC)
IF(NOT _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS AND
NOT _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS AND
NOT _OPENTHREADS_ATOMIC_USE_SUN AND
NOT _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED AND
NOT _OPENTHREADS_ATOMIC_USE_BSD_ATOMIC)
SET(_OPENTHREADS_ATOMIC_USE_MUTEX 1)
ENDIF()
# MinGW can set both WIN32_INTERLOCKED and GCC_BUILTINS to true which results in compliation errors
IF (_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS AND _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED)
# In this case we prefer the GCC_BUILTINS
SET(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS 1)
SET(_OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED 0)
ENDIF()
ENDIF()
ENDIF()
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