Migrate away from deprecated OSAtomic APIs. (#4184)

* Migrate away from deprecated OSAtomic APIs.

2 files changed, 12 insertions, 8 deletions

diff --git a/objectivec/google/protobuf/Struct.pbobjc.m b/objectivec/google/protobuf/Struct.pbobjc.m
index f36ec582..dff2f844 100644
--- a/objectivec/google/protobuf/Struct.pbobjc.m
+++ b/objectivec/google/protobuf/Struct.pbobjc.m
@@ -51,7 +51,7 @@ static GPBFileDescriptor *GPBStructRoot_FileDescriptor(void) {
 #pragma mark - Enum GPBNullValue
 
 GPBEnumDescriptor *GPBNullValue_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = NULL;
   if (!descriptor) {
     static const char *valueNames =
         "NullValue\000";
@@ -64,7 +64,8 @@ GPBEnumDescriptor *GPBNullValue_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBNullValue_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
diff --git a/objectivec/google/protobuf/Type.pbobjc.m b/objectivec/google/protobuf/Type.pbobjc.m
index 7a949388..06795308 100644
--- a/objectivec/google/protobuf/Type.pbobjc.m
+++ b/objectivec/google/protobuf/Type.pbobjc.m
@@ -54,7 +54,7 @@ static GPBFileDescriptor *GPBTypeRoot_FileDescriptor(void) {
 #pragma mark - Enum GPBSyntax
 
 GPBEnumDescriptor *GPBSyntax_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = NULL;
   if (!descriptor) {
     static const char *valueNames =
         "SyntaxProto2\000SyntaxProto3\000";
@@ -68,7 +68,8 @@ GPBEnumDescriptor *GPBSyntax_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBSyntax_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
@@ -368,7 +369,7 @@ void SetGPBField_Cardinality_RawValue(GPBField *message, int32_t value) {
 #pragma mark - Enum GPBField_Kind
 
 GPBEnumDescriptor *GPBField_Kind_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = NULL;
   if (!descriptor) {
     static const char *valueNames =
         "TypeUnknown\000TypeDouble\000TypeFloat\000TypeInt"
@@ -404,7 +405,8 @@ GPBEnumDescriptor *GPBField_Kind_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBField_Kind_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
@@ -441,7 +443,7 @@ BOOL GPBField_Kind_IsValidValue(int32_t value__) {
 #pragma mark - Enum GPBField_Cardinality
 
 GPBEnumDescriptor *GPBField_Cardinality_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = NULL;
   if (!descriptor) {
     static const char *valueNames =
         "CardinalityUnknown\000CardinalityOptional\000C"
@@ -458,7 +460,8 @@ GPBEnumDescriptor *GPBField_Cardinality_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBField_Cardinality_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }