From 0917b3d40163b247c05fe33f60eb71c00a7c6854 Mon Sep 17 00:00:00 2001
From: Augustin Degomme <augustin.degomme@imag.fr>
Date: Thu, 28 Aug 2014 15:26:15 +0200
Subject: [PATCH 1/1] Add a xbt wrapper for simcall_mutex_trylock (asked in
 [#17878])

---
 include/xbt/synchro_core.h | 9 +++++++++
 src/xbt/xbt_sg_synchro.c   | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/include/xbt/synchro_core.h b/include/xbt/synchro_core.h
index d4274884c7..2c8e641a1b 100644
--- a/include/xbt/synchro_core.h
+++ b/include/xbt/synchro_core.h
@@ -79,6 +79,15 @@ XBT_PUBLIC(xbt_mutex_t) xbt_mutex_init(void);
 /** @brief Blocks onto the given mutex variable */
 XBT_PUBLIC(void) xbt_mutex_acquire(xbt_mutex_t mutex);
 
+/** @brief Tries to block onto the given mutex variable 
+ * Tries to lock a mutex, return 1 if the mutex is unlocked, else 0.
+ * This function does not block and wait for the mutex to be unlocked.
+ * \param mutex The mutex
+ * \param issuer The process that tries to acquire the mutex
+ * \return 1 - mutex free, 0 - mutex used
+ */
+XBT_PUBLIC(int) xbt_mutex_try_acquire(xbt_mutex_t mutex);
+
 /** @brief Releases the given mutex variable */
 XBT_PUBLIC(void) xbt_mutex_release(xbt_mutex_t mutex);
 
diff --git a/src/xbt/xbt_sg_synchro.c b/src/xbt/xbt_sg_synchro.c
index 724755b2ae..3221ba8036 100644
--- a/src/xbt/xbt_sg_synchro.c
+++ b/src/xbt/xbt_sg_synchro.c
@@ -140,6 +140,11 @@ void xbt_mutex_acquire(xbt_mutex_t mutex)
   simcall_mutex_lock((smx_mutex_t) mutex);
 }
 
+int xbt_mutex_try_acquire(xbt_mutex_t mutex)
+{
+  return simcall_mutex_trylock((smx_mutex_t) mutex);
+}
+
 void xbt_mutex_release(xbt_mutex_t mutex)
 {
   simcall_mutex_unlock((smx_mutex_t) mutex);
-- 
2.20.1