$NetBSD: patch-src_zm_thread_cpp,v 1.4 2022/09/27 01:20:39 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	2019-02-22 15:38:47.000000000 +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 )
 {
@@ -307,7 +315,7 @@ void Thread::join()
   if ( isThread() )
     throw ThreadException( "Can't self join thread" );
   mThreadMutex.lock();
-  if ( mPid >= 0 )
+  if ( mPid != MPID_UNDEFINED )
   {
     if ( mStarted )
     {
@@ -336,4 +344,5 @@ void Thread::kill( int signal )
 }
 
 // Some explicit template instantiations
-#include "zm_threaddata.cpp"
+template class ThreadData<bool>;
+template class ThreadData<int>;