Thread support is now required

Long ago we supported systems where there was no support for
threads, or where the threading library was broken. We shouldn't
have do that any more: on every OS that matters, threads exist, and
the OS supports running threads across multiple CPUs.

This resolves tickets 9495 and 12439.  It's a prerequisite to making
our workqueue code work better, since sensible workqueue
implementations don't split across multiple processes.

1 files changed, 2 insertions, 13 deletions

diff --git a/src/common/crypto.c b/src/common/crypto.c
index a247a87d48..16292455b5 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -75,12 +75,10 @@
 /** Macro: is k a valid RSA private key? */
 #define PRIVATE_KEY_OK(k) ((k) && (k)->key && (k)->key->p)
 
-#ifdef TOR_IS_MULTITHREADED
 /** A number of preallocated mutexes for use by OpenSSL. */
 static tor_mutex_t **openssl_mutexes_ = NULL;
 /** How many mutexes have we allocated for use by OpenSSL? */
 static int n_openssl_mutexes_ = 0;
-#endif
 
 /** A public key, or a public/private key-pair. */
 struct crypto_pk_t
@@ -3090,8 +3088,6 @@ memwipe(void *mem, uint8_t byte, size_t sz)
   memset(mem, byte, sz);
 }
 
-#ifdef TOR_IS_MULTITHREADED
-
 #ifndef OPENSSL_THREADS
 #error OpenSSL has been built without thread support. Tor requires an \
  OpenSSL library with thread support enabled.
@@ -3178,13 +3174,6 @@ setup_openssl_threading(void)
   CRYPTO_set_dynlock_destroy_callback(openssl_dynlock_destroy_cb_);
   return 0;
 }
-#else
-static int
-setup_openssl_threading(void)
-{
-  return 0;
-}
-#endif
 
 /** Uninitialize the crypto library. Return 0 on success, -1 on failure.
  */
@@ -3208,7 +3197,7 @@ crypto_global_cleanup(void)
 
   CONF_modules_unload(1);
   CRYPTO_cleanup_all_ex_data();
-#ifdef TOR_IS_MULTITHREADED
+
   if (n_openssl_mutexes_) {
     int n = n_openssl_mutexes_;
     tor_mutex_t **ms = openssl_mutexes_;
@@ -3220,7 +3209,7 @@ crypto_global_cleanup(void)
     }
     tor_free(ms);
   }
-#endif
+
   tor_free(crypto_openssl_version_str);
   tor_free(crypto_openssl_header_version_str);
   return 0;