wolfssl/wolfcrypt/wc_port.h and wolfcrypt/src/wc_port.c: implement wolfSSL_Atomic_Int_Exchange().

Author: douzzer

wolfcrypt/src/wc_port.c

@@ -1432,6 +1432,11 @@ unsigned int wolfSSL_Atomic_Uint_SubFetch(wolfSSL_Atomic_Uint* c,
     return val - i;
 }
 
+int wolfSSL_Atomic_Int_Exchange(wolfSSL_Atomic_Int* c, int new_i)
+{
+    return atomic_swap_int(c, new_i);
+}
+
 int wolfSSL_Atomic_Int_CompareExchange(wolfSSL_Atomic_Int* c, int *expected_i,
                                        int new_i)
 {
@@ -1495,6 +1500,11 @@ int wolfSSL_Atomic_Int_SubFetch(wolfSSL_Atomic_Int* c, int i)
     return ret - i;
 }
 
+int wolfSSL_Atomic_Int_Exchange(wolfSSL_Atomic_Int* c, int new_i)
+{
+    return atomic_exchange_explicit(c, new_i, memory_order_seq_cst);
+}
+
 int wolfSSL_Atomic_Int_CompareExchange(
     wolfSSL_Atomic_Int* c, int *expected_i, int new_i)
 {
@@ -1600,6 +1610,11 @@ int wolfSSL_Atomic_Int_SubFetch(wolfSSL_Atomic_Int* c, int i)
     return __atomic_sub_fetch(c, i, __ATOMIC_RELAXED);
 }
 
+int wolfSSL_Atomic_Int_Exchange(wolfSSL_Atomic_Int* c, int new_i)
+{
+    return __atomic_exchange_n(c, new_i, __ATOMIC_SEQ_CST);
+}
+
 int wolfSSL_Atomic_Int_CompareExchange(wolfSSL_Atomic_Int* c, int *expected_i,
                                        int new_i)
 {
@@ -1692,6 +1707,12 @@ int wolfSSL_Atomic_Int_SubFetch(wolfSSL_Atomic_Int* c, int i)
     return ret - i;
 }
 
+int wolfSSL_Atomic_Int_Exchange(wolfSSL_Atomic_Int* c, int new_i)
+{
+    long actual_i = InterlockedExchange(c, (long)new_i);
+    return (int)actual_i;
+}
+
 int wolfSSL_Atomic_Int_CompareExchange(wolfSSL_Atomic_Int* c, int *expected_i,
                                        int new_i)
 {

wolfssl/wolfcrypt/wc_port.h

@@ -613,6 +613,8 @@
     WOLFSSL_API int wolfSSL_Atomic_Int_FetchSub(wolfSSL_Atomic_Int* c, int i);
     WOLFSSL_API int wolfSSL_Atomic_Int_AddFetch(wolfSSL_Atomic_Int* c, int i);
     WOLFSSL_API int wolfSSL_Atomic_Int_SubFetch(wolfSSL_Atomic_Int* c, int i);
+    WOLFSSL_API int wolfSSL_Atomic_Int_Exchange(
+        wolfSSL_Atomic_Int* c, int new_i);
     WOLFSSL_API int wolfSSL_Atomic_Int_CompareExchange(
         wolfSSL_Atomic_Int* c, int *expected_i, int new_i);
     WOLFSSL_API unsigned int wolfSSL_Atomic_Uint_FetchAdd(
@@ -652,6 +654,13 @@
     static WC_INLINE int wolfSSL_Atomic_Int_SubFetch(int *c, int i) {
         return (*c -= i);
     }
+    static WC_INLINE int wolfSSL_Atomic_Int_Exchange(
+        int *c, int new_i)
+    {
+        int ret = *c;
+        *c = new_i;
+        return ret;
+    }
     static WC_INLINE int wolfSSL_Atomic_Int_CompareExchange(
         int *c, int *expected_i, int new_i)
     {