Fixing tsan errors in OpenSSL (#319)

- Added cross-platform implementation of gpr_thd_currentid();
- OpenSSL still shows some TSAN errors on OPENSSL_cleanse which is
  inherently not thread-safe but this should not matter:
  see
  http://stackoverflow.com/questions/26433772/why-does-openssl-cleanse-look-so-complex-and-thread-unsafe

include/grpc/support/thd.h

@@ -44,18 +44,12 @@
 
 #include <grpc/support/port_platform.h>
 
-#if defined(GPR_POSIX_SYNC)
-#include <grpc/support/thd_posix.h>
-#elif defined(GPR_WIN32)
-#include <grpc/support/thd_win32.h>
-#else
-#error could not determine platform for thd
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef gpr_uint64 gpr_thd_id;
+
 /* Thread creation options. */
 typedef struct {
   int flags; /* Flags below can be set here.  Default value 0.  */
@@ -72,6 +66,9 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
 /* Return a gpr_thd_options struct with all fields set to defaults. */
 gpr_thd_options gpr_thd_options_default(void);
 
+/* Returns the identifier of the current thread. */
+gpr_thd_id gpr_thd_currentid(void);
+
 #ifdef __cplusplus
 }
 #endif

include/grpc/support/thd_posix.h

@@ -1,42 +0,0 @@
-/*
- *
- * Copyright 2014, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef __GRPC_SUPPORT_THD_POSIX_H__
-#define __GRPC_SUPPORT_THD_POSIX_H__
-/* Posix variant of gpr_thd_platform.h. */
-
-#include <pthread.h>
-
-typedef pthread_t gpr_thd_id;
-
-#endif /* __GRPC_SUPPORT_THD_POSIX_H__ */

include/grpc/support/thd_win32.h

@@ -1,44 +0,0 @@
-/*
- *
- * Copyright 2014, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef __GRPC_SUPPORT_THD_WIN32_H__
-#define __GRPC_SUPPORT_THD_WIN32_H__
-
-/* Win32 variant of gpr_thd_platform.h */
-
-#include <windows.h>
-#include <grpc/support/atm.h>
-
-typedef int gpr_thd_id;
-
-#endif /* __GRPC_SUPPORT_THD_WIN32_H__ */

src/core/support/thd_posix.c

@@ -62,17 +62,19 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
                 const gpr_thd_options *options) {
   int thread_started;
   pthread_attr_t attr;
+  pthread_t p;
   struct thd_arg *a = gpr_malloc(sizeof(*a));
   a->body = thd_body;
   a->arg = arg;
 
   GPR_ASSERT(pthread_attr_init(&attr) == 0);
   GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
-  thread_started = (pthread_create(t, &attr, &thread_body, a) == 0);
+  thread_started = (pthread_create(&p, &attr, &thread_body, a) == 0);
   GPR_ASSERT(pthread_attr_destroy(&attr) == 0);
   if (!thread_started) {
     gpr_free(a);
   }
+  *t = (gpr_thd_id)p;
   return thread_started;
 }
 
@@ -82,4 +84,8 @@ gpr_thd_options gpr_thd_options_default(void) {
   return options;
 }
 
+gpr_thd_id gpr_thd_currentid(void) {
+  return (gpr_thd_id)pthread_self();
+}
+
 #endif /* GPR_POSIX_SYNC */

src/core/support/thd_win32.c

@@ -77,4 +77,8 @@ gpr_thd_options gpr_thd_options_default(void) {
   return options;
 }
 
+gpr_thd_id gpr_thd_currentid(void) {
+  return (gpr_thd_id)GetCurrentThreadId();
+}
+
 #endif /* GPR_WIN32 */

src/core/tsi/ssl_transport_security.c

@@ -37,6 +37,7 @@
 
 #include <grpc/support/log.h>
 #include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
 #include <grpc/support/useful.h>
 #include "src/core/tsi/transport_security.h"
 
@@ -103,11 +104,32 @@ typedef struct {
 /* --- Library Initialization. ---*/
 
 static gpr_once init_openssl_once = GPR_ONCE_INIT;
+static gpr_mu *openssl_mutexes = NULL;
+
+static void openssl_locking_cb(int mode, int type, const char* file, int line) {
+  if (mode & CRYPTO_LOCK) {
+    gpr_mu_lock(&openssl_mutexes[type]);
+  } else {
+    gpr_mu_unlock(&openssl_mutexes[type]);
+  }
+}
+
+static unsigned long openssl_thread_id_cb(void) {
+  return (unsigned long)gpr_thd_currentid();
+}
 
 static void init_openssl(void) {
+  int i;
   SSL_library_init();
   SSL_load_error_strings();
   OpenSSL_add_all_algorithms();
+  openssl_mutexes = malloc(CRYPTO_num_locks() * sizeof(gpr_mu));
+  GPR_ASSERT(openssl_mutexes != NULL);
+  for (i = 0; i < CRYPTO_num_locks(); i++) {
+    gpr_mu_init(&openssl_mutexes[i]);
+  }
+  CRYPTO_set_locking_callback(openssl_locking_cb);
+  CRYPTO_set_id_callback(openssl_thread_id_cb);
 }
 
 /* --- Ssl utils. ---*/