From 6a93b596c5c3af31b843d63013a7985ffeea354d Mon Sep 17 00:00:00 2001 From: Wan-Teh Chang Date: Fri, 2 Dec 2016 16:56:16 -0800 Subject: compat/atomics: add typecasts in atomic_compare_exchange_strong() The Solaris and Windows emulations of atomic_compare_exchange_strong() need typecasts to avoid compiler warnings, because the functions they call expect a void* pointer but an intptr_t integer is passed. Note that the emulations of atomic_compare_exchange_strong() (except the gcc version) only work for atomic_intptr_t because of the type of the second argument (|expected|). See http://en.cppreference.com/w/c/atomic: _Bool atomic_compare_exchange_strong( volatile A* obj, C* expected, C desired ); The types of the first argument and second argument are different (|A| and |C|, respectively). |C| is the non-atomic type corresponding to |A|. In the emulations of atomic_compare_exchange_strong(), |C| is intptr_t. This implies |A| can only be sig_intptr_t. Signed-off-by: Wan-Teh Chang --- compat/atomics/win32/stdatomic.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'compat/atomics/win32') diff --git a/compat/atomics/win32/stdatomic.h b/compat/atomics/win32/stdatomic.h index bdd39337a3..9cfdaa523f 100644 --- a/compat/atomics/win32/stdatomic.h +++ b/compat/atomics/win32/stdatomic.h @@ -104,7 +104,8 @@ static inline int atomic_compare_exchange_strong(intptr_t *object, intptr_t *exp intptr_t desired) { intptr_t old = *expected; - *expected = InterlockedCompareExchangePointer(object, desired, old); + *expected = (intptr_t)InterlockedCompareExchangePointer( + (PVOID *)object, (PVOID)desired, (PVOID)old); return *expected == old; } -- cgit v1.2.3