From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/mysys/thr_cond.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 mysql/mysys/thr_cond.c

(limited to 'mysql/mysys/thr_cond.c')

diff --git a/mysql/mysys/thr_cond.c b/mysql/mysys/thr_cond.c
new file mode 100644
index 0000000..25decb4
--- /dev/null
+++ b/mysql/mysys/thr_cond.c
@@ -0,0 +1,113 @@
+/* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#ifdef SAFE_MUTEX
+
+#include "thr_cond.h"
+#include "my_thread_local.h"
+
+int safe_cond_wait(native_cond_t *cond, my_mutex_t *mp,
+                   const char *file, uint line)
+{
+  int error;
+  native_mutex_lock(&mp->global);
+  if (mp->count == 0)
+  {
+    fprintf(stderr,"safe_mutex: Trying to cond_wait on a unlocked mutex at %s, line %d\n",file,line);
+    fflush(stderr);
+    abort();
+  }
+  if (!my_thread_equal(my_thread_self(),mp->thread))
+  {
+    fprintf(stderr,"safe_mutex: Trying to cond_wait on a mutex at %s, line %d  that was locked by another thread at: %s, line: %d\n",
+	    file,line,mp->file,mp->line);
+    fflush(stderr);
+    abort();
+  }
+
+  if (mp->count-- != 1)
+  {
+    fprintf(stderr,"safe_mutex:  Count was %d on locked mutex at %s, line %d\n",
+	    mp->count+1, file, line);
+    fflush(stderr);
+    abort();
+  }
+  native_mutex_unlock(&mp->global);
+  error= native_cond_wait(cond,&mp->mutex);
+  native_mutex_lock(&mp->global);
+  if (error)
+  {
+    fprintf(stderr,"safe_mutex: Got error: %d (%d) when doing a safe_mutex_wait at %s, line %d\n", error, errno, file, line);
+    fflush(stderr);
+    abort();
+  }
+  mp->thread= my_thread_self();
+  if (mp->count++)
+  {
+#ifndef DBUG_OFF
+    fprintf(stderr,
+	    "safe_mutex:  Count was %d in thread 0x%x when locking mutex at %s, line %d\n",
+	    mp->count-1, my_thread_var_id(), file, line);
+    fflush(stderr);
+#endif
+    abort();
+  }
+  mp->file= file;
+  mp->line=line;
+  native_mutex_unlock(&mp->global);
+  return error;
+}
+
+
+int safe_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
+                        const struct timespec *abstime,
+                        const char *file, uint line)
+{
+  int error;
+  native_mutex_lock(&mp->global);
+  if (mp->count != 1 || !my_thread_equal(my_thread_self(),mp->thread))
+  {
+    fprintf(stderr,"safe_mutex: Trying to cond_wait at %s, line %d on a not hold mutex\n",file,line);
+    fflush(stderr);
+    abort();
+  }
+  mp->count--;					/* Mutex will be released */
+  native_mutex_unlock(&mp->global);
+  error= native_cond_timedwait(cond,&mp->mutex,abstime);
+#ifdef EXTRA_DEBUG
+  if (error && (error != EINTR && error != ETIMEDOUT && error != ETIME))
+  {
+    fprintf(stderr,"safe_mutex: Got error: %d (%d) when doing a safe_cond_timedwait at %s, line %d\n", error, errno, file, line);
+  }
+#endif
+  native_mutex_lock(&mp->global);
+  mp->thread= my_thread_self();
+  if (mp->count++)
+  {
+#ifndef DBUG_OFF
+    fprintf(stderr,
+	    "safe_mutex:  Count was %d in thread 0x%x when locking mutex at %s, line %d (error: %d (%d))\n",
+	    mp->count-1, my_thread_var_id(), file, line, error, error);
+    fflush(stderr);
+#endif
+    abort();
+  }
+  mp->file= file;
+  mp->line=line;
+  native_mutex_unlock(&mp->global);
+  return error;
+}
+
+#endif
-- 
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