Add failing test for atomicity of WaitForMultipleEvents w/ waitAll

Test contributed by @qwertymaster617, see [0] for associated issue.

[0]: #9

meson.build

@@ -33,6 +33,7 @@ basic_tests = ['ManualResetInitialState',
 # Tests that required wfmo
 wfmo_tests = [
     'WaitTimeoutAllSignalled',
+    'AtomicWaitAll',
   ]
 
 test_std = 'c++11'

tests/AtomicWaitAll.cpp

@@ -0,0 +1,45 @@
+#ifdef _WIN32
+#include <Windows.h>
+#endif
+#include <cassert>
+#include <chrono>
+#include <iostream>
+#include <pevents.h>
+#include <thread>
+
+using namespace neosmart;
+
+int main() {
+    neosmart::neosmart_event_t lEvents[3];
+    lEvents[0] = neosmart::CreateEvent( false, true );  // Already Signaled AutoReset
+    lEvents[1] = neosmart::CreateEvent( false, false ); // Not Signaled AutoReset
+    lEvents[2] = neosmart::CreateEvent( false, true );  // Already Signaled AutoReset
+
+    // WFMO is non-destructive if a wait-all with any timeout value fails on auto-reset events.
+    if ( neosmart::WaitForMultipleEvents( lEvents, 3, true, 0 ) == 0 )
+        throw std::runtime_error( "Must not be signaled!" );
+
+    // FAILS!!
+    if ( neosmart::WaitForEvent( lEvents[0], 0 ) != 0 )
+        throw std::runtime_error( "Must be signaled" );
+
+    if ( neosmart::WaitForEvent( lEvents[1], 0 ) != WAIT_TIMEOUT )
+        throw std::runtime_error( "Must not be signaled" );
+
+    // FAILS!!
+    if ( neosmart::WaitForEvent( lEvents[2], 0 ) != 0 )
+        throw std::runtime_error( "Must be signaled" );
+
+
+    // WFMO is destructive if a wait-all succeeds with any timeout value on auto-reset events.
+    for ( auto& lEvent : lEvents )
+        neosmart::SetEvent( lEvent );
+    if ( neosmart::WaitForMultipleEvents( lEvents, 3, true, 0 ) != 0 )  // OK
+        throw std::runtime_error( "Must be signaled!" );
+    for ( auto& lEvent : lEvents )
+    {
+        if ( neosmart::WaitForEvent( lEvent, 0 ) != WAIT_TIMEOUT ) // OK
+            throw std::runtime_error( "Must not be signaled" );
+        neosmart::DestroyEvent( lEvent );
+    }
+}