- Add libmysql to the tree

1 files changed, 198 insertions, 0 deletions

diff --git a/ext/mysql/libmysql/thr_mutex.c b/ext/mysql/libmysql/thr_mutex.c
new file mode 100644
index 0000000000..3ac2013efd
--- /dev/null
+++ b/ext/mysql/libmysql/thr_mutex.c
@@ -0,0 +1,198 @@
+/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
+   This file is public domain and comes with NO WARRANTY of any kind */
+
+/* This makes a wrapper for mutex handling to make it easier to debug mutex */
+
+#include <global.h>
+#ifdef HAVE_LINUXTHREADS			/* Some extra safety */
+#define __USE_UNIX98
+#endif
+#include <m_string.h>
+#if defined(THREAD) && defined(SAFE_MUTEX)
+#undef SAFE_MUTEX		/* Avoid safe_mutex redefinitions */
+#include <my_pthread.h>
+
+
+/* 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
+
+int safe_mutex_init(safe_mutex_t *mp, const pthread_mutexattr_t *attr)
+{
+  bzero((char*) mp,sizeof(*mp));
+#ifdef HAVE_LINUXTHREADS			/* Some extra safety */
+  {
+    pthread_mutexattr_t tmp;
+    pthread_mutexattr_init(&tmp);
+    pthread_mutexattr_settype(&tmp,PTHREAD_MUTEX_ERRORCHECK_NP);
+    pthread_mutex_init(&mp->global,&tmp);
+    pthread_mutex_init(&mp->mutex, &tmp);
+    pthread_mutexattr_destroy(&tmp);
+  }
+#else
+  pthread_mutex_init(&mp->global,NULL);
+  pthread_mutex_init(&mp->mutex,attr);
+#endif
+  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);
+    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);
+    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);
+    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);
+    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);
+    abort();
+  }
+  mp->count--;
+  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);
+    abort();
+  }
+  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);
+    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);
+    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);
+    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);
+    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);
+    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);
+    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);
+    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)
+{
+  if (mp->count != 0)
+  {
+    fprintf(stderr,"safe_mutex: Trying to destroy a mutex that was locked at %s, line %d\n",
+	    mp->file,mp->line);
+    abort();
+  }
+  pthread_mutex_destroy(&mp->global);
+  return pthread_mutex_destroy(&mp->mutex);
+}
+
+#endif /* SAFE_MUTEX */