From c6fde10766298ad1938d3e5c3069e55a945e997c Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Thu, 3 May 2018 13:53:32 -0400
Subject: [PATCH] Implement trylock

---
 src/zm_thread.cpp | 3 +++
 src/zm_thread.h   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/src/zm_thread.cpp b/src/zm_thread.cpp
index 559947d04..ca5784e7c 100644
--- a/src/zm_thread.cpp
+++ b/src/zm_thread.cpp
@@ -61,6 +61,9 @@ Mutex::~Mutex() {
     Error("Unable to destroy pthread mutex: %s", strerror(errno));
 }
 
+int Mutex::trylock() {
+  return pthread_mutex_trylock(&mMutex);
+}
 void Mutex::lock() {
   if ( pthread_mutex_lock(&mMutex) < 0 )
     throw ThreadException( stringtf( "Unable to lock pthread mutex: %s", strerror(errno) ) );
diff --git a/src/zm_thread.h b/src/zm_thread.h
index 66df9fd8e..e1facc6a5 100644
--- a/src/zm_thread.h
+++ b/src/zm_thread.h
@@ -74,6 +74,7 @@ private:
   }
 
 public:
+  int trylock();
   void lock();
   void lock( int secs );
   void lock( double secs );