Added possibility to repeat the -Dm option to halve the mutex maximum wait time.

git-svn-id: http://yate.null.ro/svn/yate/trunk@2982 acf43c95-373e-0410-b603-e72c3f656dc1

docs/man/yate.8

@@ -97,7 +97,7 @@ Special debugging options
 Abort (coredumps if allowed) if bugs are encountered
 .TP
 .B \-Dm
-Attempt to debug mutex deadlocks by setting a maximum 10s limit
+Attempt to debug mutex deadlocks by setting a maximum 10s limit, if repeated halves the limit
 .TP
 .B \-Dl
 Attempt to load modules without having their symbols globally visible

engine/Engine.cpp

@@ -1682,7 +1682,17 @@ int Engine::main(int argc, const char** argv, const char** env, RunMode mode, bo
 				    s_lateabrt = true;
 				    break;
 				case 'm':
-				    Lockable::wait(10000000);
+				    {
+					unsigned long lockWait = Lockable::wait();
+					if (lockWait) {
+					    lockWait /= 2;
+					    if (lockWait < Thread::idleUsec())
+						lockWait = Thread::idleUsec();
+					}
+					else
+					    lockWait = 10000000;
+					Lockable::wait(lockWait);
+				    }
 				    break;
 #ifdef RTLD_GLOBAL
 				case 'l':

engine/Mutex.cpp

@@ -511,6 +511,10 @@ void Lockable::wait(unsigned long maxwait)
     s_maxwait = maxwait;
 }
 
+unsigned long Lockable::wait()
+{
+    return s_maxwait;
+}
 
 Mutex::Mutex(bool recursive, const char* name)
     : m_private(0)

yateclass.h

@@ -3637,6 +3637,12 @@ public:
      */
     static void wait(unsigned long maxwait);
 
+    /**
+     * Get the maximum wait time used for debugging purposes
+     * @return Maximum time in microseconds, zero if no maximum is set
+     */
+    static unsigned long wait();
+
     /**
      * Start actually using lockables, for platforms where these objects are not
      *  usable in global object constructors.