Try to access 'support' only atomically (#520)

RoaringBitmap · Oct 8, 2023 · 0e27348 · 0e27348
1 parent c438bee
commit 0e27348
Showing 1 changed file with 15 additions and 7 deletions.
diff --git a/src/isadetection.c b/src/isadetection.c
@@ -198,23 +198,23 @@ static inline uint32_t dynamic_croaring_detect_supported_architectures(void) {
  if (ebx & cpuid_avx512f_bit) {
  host_isa |= CROARING_AVX512F;
  }
- 
+
  if (ebx & cpuid_avx512bw_bit) {
  host_isa |= CROARING_AVX512BW;
  }
- 
+
  if (ebx & cpuid_avx512dq_bit) {
  host_isa |= CROARING_AVX512DQ;
  }
- 
+
  if (ecx & cpuid_avx512vbmi2_bit) {
  host_isa |= CROARING_AVX512VBMI2;
  }
- 
+
  if (ecx & cpuid_avx512bitalg_bit) {
  host_isa |= CROARING_AVX512BITALG;
  }
- 
+
  if (ecx & cpuid_avx512vpopcntdq_bit) {
  host_isa |= CROARING_AVX512VPOPCNTDQ;
  }
@@ -267,7 +267,11 @@ int croaring_hardware_support(void) {
 #elif defined(__AVX2__)
 
 int croaring_hardware_support(void) {
- static int support = 0xFFFFFFF;
+ static
+#if CROARING_ATOMIC_IMPL == CROARING_ATOMIC_IMPL_C
+ _Atomic
+#endif
+ int support = 0xFFFFFFF;
  if(support == 0xFFFFFFF) {
  bool avx512_support = false;
 #if CROARING_COMPILER_SUPPORTS_AVX512
@@ -281,7 +285,11 @@ int croaring_hardware_support(void) {
 #else
 
 int croaring_hardware_support(void) {
- static int support = 0xFFFFFFF;
+ static
+#if CROARING_ATOMIC_IMPL == CROARING_ATOMIC_IMPL_C
+ _Atomic
+#endif
+ int support = 0xFFFFFFF;
  if(support == 0xFFFFFFF) {
  bool has_avx2 = (croaring_detect_supported_architectures() & CROARING_AVX2) == CROARING_AVX2;
  bool has_avx512 = false;