From 30ff41beab5d8a53cbcbdab4109b32b9ef5c0f6e Mon Sep 17 00:00:00 2001 From: Pauli Date: Mon, 9 Oct 2017 14:39:43 +1000 Subject: Add atomic write call Reviewed-by: Rich Salz (Merged from https://github.com/openssl/openssl/pull/4414) --- crypto/threads_pthread.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'crypto/threads_pthread.c') diff --git a/crypto/threads_pthread.c b/crypto/threads_pthread.c index 3f8ada2c37..34be314f1f 100644 --- a/crypto/threads_pthread.c +++ b/crypto/threads_pthread.c @@ -188,6 +188,25 @@ int CRYPTO_atomic_read(int *val, int *ret, CRYPTO_RWLOCK *lock) return 1; } +int CRYPTO_atomic_write(int *val, int n, CRYPTO_RWLOCK *lock) +{ +# if defined(__GNUC__) && defined(__ATOMIC_RELEASE) + if (__atomic_is_lock_free(sizeof(*val), val)) { + __atomic_store(val, &n, __ATOMIC_RELEASE); + return 1; + } +# endif + if (!CRYPTO_THREAD_write_lock(lock)) + return 0; + + *val = n; + + if (!CRYPTO_THREAD_unlock(lock)) + return 0; + + return 1; +} + # ifdef OPENSSL_SYS_UNIX static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT; -- cgit v1.2.3