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bpo-39465: Add pycore_atomic_funcs.h internal header #20766

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Merged
vstinner merged 4 commits into from
Dec 23, 2020
Merged

bpo-39465: Add pycore_atomic_funcs.h internal header #20766

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23cfadf
bpo-39465: Add pycore_atomic_funcs.h header
vstinner Jun 9, 2020
08a37ee
Fix Windows impl
vstinner Dec 23, 2020
afebc16
Fix 32-bit Windows
vstinner Dec 23, 2020
2de9950
Enhance sizeof() assert
vstinner Dec 23, 2020
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Enhance sizeof() assert
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@vstinner
vstinner committed Dec 23, 2020
commit 2de99500ea77030c47898ea6d1cb126fb6a11ae9
8 changes: 4 additions & 4 deletions Include/internal/pycore_atomic_funcs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,14 +42,14 @@ static inline void _Py_atomic_size_set(Py_ssize_t *var, Py_ssize_t value)
static inline Py_ssize_t _Py_atomic_size_get(Py_ssize_t *var)
{
#if SIZEOF_VOID_P == 8
Py_BUILD_ASSERT(sizeof(__int64) == sizeof(Py_ssize_t));
Py_BUILD_ASSERT(sizeof(__int64) == sizeof(*var));
volatile __int64 *volatile_var = (volatile __int64 *)var;
__int64 old;
do {
old = *volatile_var;
} while(_InterlockedCompareExchange64(volatile_var, old, old) != old);
#else
Py_BUILD_ASSERT(sizeof(long) == sizeof(Py_ssize_t));
Py_BUILD_ASSERT(sizeof(long) == sizeof(*var));
volatile long *volatile_var = (volatile long *)var;
long old;
do {
Expand All @@ -62,11 +62,11 @@ static inline Py_ssize_t _Py_atomic_size_get(Py_ssize_t *var)
static inline void _Py_atomic_size_set(Py_ssize_t *var, Py_ssize_t value)
{
#if SIZEOF_VOID_P == 8
Py_BUILD_ASSERT(sizeof(__int64) == sizeof(Py_ssize_t));
Py_BUILD_ASSERT(sizeof(__int64) == sizeof(*var));
volatile __int64 *volatile_var = (volatile __int64 *)var;
_InterlockedExchange64(volatile_var, value);
#else
Py_BUILD_ASSERT(sizeof(long) == sizeof(Py_ssize_t));
Py_BUILD_ASSERT(sizeof(long) == sizeof(*var));
volatile long *volatile_var = (volatile long *)var;
_InterlockedExchange(volatile_var, value);
#endif
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