1 files changed, 10 insertions, 0 deletions
diff --git a/crypto/threads_pthread.c b/crypto/threads_pthread.c
index 0d351ca6fa..c3fd2411db 100644
--- a/crypto/threads_pthread.c
+++ b/crypto/threads_pthread.c
@@ -10,6 +10,10 @@
 #include <openssl/crypto.h>
 #include "internal/cryptlib.h"
 
+#if defined(__sun)
+# include <atomic.h>
+#endif
+
 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
 
 # ifdef PTHREAD_RWLOCK_INITIALIZER
@@ -162,6 +166,12 @@ int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
         *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
         return 1;
     }
+# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
+    /* This will work for all future Solaris versions. */
+    if (ret != NULL) {
+        *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
+        return 1;
+    }
 # endif
     if (!CRYPTO_THREAD_write_lock(lock))
         return 0;