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authorRainer Gerhards <rgerhards@adiscon.com>2007-12-11 16:18:43 +0000
committerRainer Gerhards <rgerhards@adiscon.com>2007-12-11 16:18:43 +0000
commit3c79979b830ad0204ae47592fa858a996ce90b5e (patch)
tree12faae4acccedfeb75f20409ee36e32b7b8ec262 /sync.c
parent4465b4d4ac8e209efcffe4030713144b3a4459c9 (diff)
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added synchronization class to handle mutex-operations in the most portable
way.
Diffstat (limited to 'sync.c')
-rw-r--r--sync.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/sync.c b/sync.c
new file mode 100644
index 0000000..38e9e0d
--- /dev/null
+++ b/sync.c
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+/* synrchonization-related stuff. In theory, that should
+ * help porting to something different from pthreads.
+ *
+ * Copyright 2007 Rainer Gerhards and Adiscon GmbH.
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * A copy of the GPL can be found in the file "COPYING" in this distribution.
+ */
+
+#include "config.h"
+
+#ifdef USE_PTHREADS
+/* all of this code is compiled only if PTHREADS is supported - otherwise
+ * we do not need syncrhonization objects (and do not have them!).
+ */
+#include <stdlib.h>
+
+#include "rsyslog.h"
+#include "sync.h"
+
+
+void
+SyncObjInit(pthread_mutex_t **mut)
+{
+ *mut = (pthread_mutex_t *) malloc (sizeof (pthread_mutex_t));
+ pthread_mutex_init(*mut, NULL);
+}
+
+
+/* This function destroys the mutex and also sets the mutex object
+ * to NULL. While the later is not strictly necessary, it is a good
+ * aid when debugging problems. As this function is not exepected to
+ * be called quite frequently, the additional overhead can well be
+ * accepted. If this changes over time, setting to NULL may be
+ * reconsidered. - rgerhards, 2007-11-12
+ */
+void
+SyncObjExit(pthread_mutex_t **mut)
+{
+ if(*mut != NULL) {
+ pthread_mutex_destroy(*mut);
+ free(*mut);
+ *mut = NULL;
+ }
+}
+
+/* lock an object. The synchronization tool (mutex) must be passed in.
+ */
+void
+lockObj(pthread_mutex_t *mut)
+{
+dbgprintf("trying to lock %lx\n", (unsigned long) mut);
+ pthread_mutex_lock(mut);
+}
+
+/* unlock an object. The synchronization tool (mutex) must be passed in.
+ */
+void
+unlockObj(pthread_mutex_t *mut)
+{
+dbgprintf("trying to UNlock %lx\n", (unsigned long) mut);
+ pthread_mutex_unlock(mut);
+}
+
+#endif /* #ifdef USE_PTHREADS */