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-rw-r--r--mysql/mysys/thr_cond.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/mysql/mysys/thr_cond.c b/mysql/mysys/thr_cond.c
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+/* 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