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-rw-r--r--mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c b/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c
new file mode 100644
index 0000000..102bb33
--- /dev/null
+++ b/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c
@@ -0,0 +1,231 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this library; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02111-1301, USA */
+
+/* This makes a wrapper for mutex handling to make it easier to debug mutex */
+
+#include <my_global.h>
+#if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98)
+#define __USE_UNIX98 /* To get rw locks under Linux */
+#endif
+#include <m_string.h>
+#if defined(THREAD) && defined(SAFE_MUTEX)
+#undef SAFE_MUTEX /* Avoid safe_mutex redefinitions */
+#include <my_pthread.h>
+
+#ifndef DO_NOT_REMOVE_THREAD_WRAPPERS
+/* Remove wrappers */
+#undef pthread_mutex_init
+#undef pthread_mutex_lock
+#undef pthread_mutex_unlock
+#undef pthread_mutex_destroy
+#undef pthread_cond_wait
+#undef pthread_cond_timedwait
+#ifdef HAVE_NONPOSIX_PTHREAD_MUTEX_INIT
+#define pthread_mutex_init(a,b) my_pthread_mutex_init((a),(b))
+#endif
+#endif /* DO_NOT_REMOVE_THREAD_WRAPPERS */
+
+int safe_mutex_init(safe_mutex_t *mp,
+ const pthread_mutexattr_t *attr __attribute__((unused)))
+{
+ bzero((char*) mp,sizeof(*mp));
+ pthread_mutex_init(&mp->global,MY_MUTEX_INIT_ERRCHK);
+ pthread_mutex_init(&mp->mutex,attr);
+ return 0;
+}
+
+int safe_mutex_lock(safe_mutex_t *mp,const char *file, uint line)
+{
+ int error;
+ pthread_mutex_lock(&mp->global);
+ if (mp->count > 0 && pthread_equal(pthread_self(),mp->thread))
+ {
+ fprintf(stderr,"safe_mutex: Trying to lock mutex at %s, line %d, when the mutex was already locked at %s, line %d\n",
+ file,line,mp->file,mp->line);
+ fflush(stderr);
+ abort();
+ }
+ pthread_mutex_unlock(&mp->global);
+ error=pthread_mutex_lock(&mp->mutex);
+ if (error || (error=pthread_mutex_lock(&mp->global)))
+ {
+ fprintf(stderr,"Got error %d when trying to lock mutex at %s, line %d\n",
+ error, file, line);
+ fflush(stderr);
+ abort();
+ }
+ if (mp->count++)
+ {
+ fprintf(stderr,"safe_mutex: Error in thread libray: Got mutex at %s, line %d more than 1 time\n", file,line);
+ fflush(stderr);
+ abort();
+ }
+ mp->thread=pthread_self();
+ mp->file= (char*) file;
+ mp->line=line;
+ pthread_mutex_unlock(&mp->global);
+ return error;
+}
+
+
+int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint line)
+{
+ int error;
+ pthread_mutex_lock(&mp->global);
+ if (mp->count == 0)
+ {
+ fprintf(stderr,"safe_mutex: Trying to unlock mutex that wasn't locked at %s, line %d\n Last used at %s, line: %d\n",
+ file,line,mp->file ? mp->file : "",mp->line);
+ fflush(stderr);
+ abort();
+ }
+ if (!pthread_equal(pthread_self(),mp->thread))
+ {
+ fprintf(stderr,"safe_mutex: Trying to unlock 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();
+ }
+ mp->count--;
+#ifdef _WIN32
+ pthread_mutex_unlock(&mp->mutex);
+ error=0;
+#else
+ error=pthread_mutex_unlock(&mp->mutex);
+ if (error)
+ {
+ fprintf(stderr,"safe_mutex: Got error: %d when trying to unlock mutex at %s, line %d\n", error, file, line);
+ fflush(stderr);
+ abort();
+ }
+#endif /* _WIN32 */
+ pthread_mutex_unlock(&mp->global);
+ return error;
+}
+
+
+int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp, const char *file,
+ uint line)
+{
+ int error;
+ pthread_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 (!pthread_equal(pthread_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();
+ }
+ pthread_mutex_unlock(&mp->global);
+ error=pthread_cond_wait(cond,&mp->mutex);
+ pthread_mutex_lock(&mp->global);
+ if (error)
+ {
+ fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_wait at %s, line %d\n", error, file, line);
+ fflush(stderr);
+ abort();
+ }
+ if (mp->count++)
+ {
+ fprintf(stderr,
+ "safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d\n",
+ mp->count-1, my_thread_id(), file, line);
+ fflush(stderr);
+ abort();
+ }
+ mp->thread=pthread_self();
+ mp->file= (char*) file;
+ mp->line=line;
+ pthread_mutex_unlock(&mp->global);
+ return error;
+}
+
+
+int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp,
+ struct timespec *abstime,
+ const char *file, uint line)
+{
+ int error;
+ pthread_mutex_lock(&mp->global);
+ if (mp->count != 1 || !pthread_equal(pthread_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 */
+ pthread_mutex_unlock(&mp->global);
+ error=pthread_cond_timedwait(cond,&mp->mutex,abstime);
+#ifdef EXTRA_DEBUG
+ if (error && (error != EINTR && error != ETIMEDOUT))
+ {
+ fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_timedwait at %s, line %d\n", error, file, line);
+ }
+#endif
+ pthread_mutex_lock(&mp->global);
+ if (mp->count++)
+ {
+ fprintf(stderr,
+ "safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d (error: %d)\n",
+ mp->count-1, my_thread_id(), file, line, error);
+ fflush(stderr);
+ abort();
+ }
+ mp->thread=pthread_self();
+ mp->file= (char*) file;
+ mp->line=line;
+ pthread_mutex_unlock(&mp->global);
+ return error;
+}
+
+int safe_mutex_destroy(safe_mutex_t *mp, const char *file, uint line)
+{
+ int error=0;
+ if (mp->count != 0)
+ {
+ fprintf(stderr,"safe_mutex: Trying to destroy a mutex that was locked at %s, line %d at %s, line %d\n",
+ mp->file,mp->line, file, line);
+ fflush(stderr);
+ abort();
+ }
+#ifdef _WIN32
+ pthread_mutex_destroy(&mp->global);
+ pthread_mutex_destroy(&mp->mutex);
+#else
+ if (pthread_mutex_destroy(&mp->global))
+ error=1;
+ if (pthread_mutex_destroy(&mp->mutex))
+ error=1;
+#endif
+ return error;
+}
+
+#endif /* THREAD && SAFE_MUTEX */