From 631f1669539aaa58b8c49c4d431930f7ab68a633 Mon Sep 17 00:00:00 2001
From: Pekka Riikonen <priikone@silcnet.org>
Date: Sat, 23 Feb 2008 15:41:33 +0200
Subject: [PATCH] Added silc_mutex_trylock

---
 lib/silcutil/silcmutex.h           | 16 ++++++++++++++++
 lib/silcutil/unix/silcunixthread.c | 13 +++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/lib/silcutil/silcmutex.h b/lib/silcutil/silcmutex.h
index 878d37de..2ff79f39 100644
--- a/lib/silcutil/silcmutex.h
+++ b/lib/silcutil/silcmutex.h
@@ -133,6 +133,22 @@ void silc_mutex_lock(SilcMutex mutex);
  ***/
 void silc_mutex_unlock(SilcMutex mutex);
 
+/****f* silcutil/silc_mutex_trylock
+ *
+ * SYNOPSIS
+ *
+ *    SilcBool silc_mutex_trylock(SilcMutex mutex);
+ *
+ * DESCRIPTION
+ *
+ *    Attempts to lock the `mutex'.  Returns TRUE if the caller was able
+ *    to acquire the lock and FALSE if the mutex is already locked.  If the
+ *    mutex is already locked the caller cannot acquire the lock at this
+ *    time.
+ *
+ ***/
+SilcBool silc_mutex_trylock(SilcMutex mutex);
+
 /****f* silcutil/silc_mutex_assert_locked
  *
  * SYNOPSIS
diff --git a/lib/silcutil/unix/silcunixthread.c b/lib/silcutil/unix/silcunixthread.c
index 286a26db..fd30cf3d 100644
--- a/lib/silcutil/unix/silcunixthread.c
+++ b/lib/silcutil/unix/silcunixthread.c
@@ -200,6 +200,19 @@ void silc_mutex_unlock(SilcMutex mutex)
 #endif /* SILC_THREADS */
 }
 
+SilcBool silc_mutex_trylock(SilcMutex mutex)
+{
+#ifdef SILC_THREADS
+  if (mutex) {
+    if (pthread_mutex_trylock(&mutex->mutex) == 0) {
+      mutex->locked = TRUE;
+      return TRUE;
+    }
+  }
+#endif /* SILC_THREADS */
+  return FALSE;
+}
+
 void silc_mutex_assert_locked(SilcMutex mutex)
 {
 #ifdef SILC_THREADS
-- 
2.24.0