$NetBSD: patch-src_zm_thread_cpp,v 1.3 2020/08/25 16:42:21 gdt Exp $

pthread_mutex_timedlock() is not available on NetBSD 5.0, and not required
in ZoneMinder.

Work around varying notion of an undefined mpid on pthread/not.

--- src/zm_thread.cpp.orig	2016-02-03 18:40:30.000000000 +0000
+++ src/zm_thread.cpp
@@ -72,6 +72,7 @@ void Mutex::lock()
         throw ThreadException( stringtf( "Unable to lock pthread mutex: %s", strerror(errno) ) );
 }
 
+#if 0
 void Mutex::lock( int secs )
 {
     struct timespec timeout = getTimeout( secs );
@@ -85,6 +86,7 @@ void Mutex::lock( double secs )
     if ( pthread_mutex_timedlock( &mMutex, &timeout ) < 0 )
         throw ThreadException( stringtf( "Unable to timedlock pthread mutex: %s", strerror(errno) ) );
 }
+#endif
 
 void Mutex::unlock()
 {
@@ -232,9 +234,15 @@ template <class T> void ThreadData<T>::u
     Debug( 9, "Updated value, %p", this );
 }
 
+#ifndef USE_PTHREAD
+#define MPID_UNDEFINED -1
+#else /* USE_PTHREAD */
+#define MPID_UNDEFINED NULL
+#endif /* USE_PTHREAD */
+
 Thread::Thread() :
     mThreadCondition( mThreadMutex ),
-    mPid( -1 ),
+    mPid( MPID_UNDEFINED ),
     mStarted( false ),
     mRunning( false )
 {
@@ -308,7 +316,7 @@ void Thread::join()
     if ( isThread() )
         throw ThreadException( "Can't self join thread" );
     mThreadMutex.lock();
-    if ( mPid >= 0 )
+    if ( mPid != MPID_UNDEFINED )
     {
         if ( mStarted )
         {
@@ -337,4 +345,5 @@ void Thread::kill( int signal )
 }
 
 // Some explicit template instantiations
-#include "zm_threaddata.cpp"
+template class ThreadData<bool>;
+template class ThreadData<int>;