Experimental Physics and
Industrial Control System

Marty Kraimer <[email protected]> · Tue, 01 Nov 2005 13:26:39 -0600

I did a cvs update and rebuild.
exampleApp still crashes.

There are still lots of warning messages like

/fdmgr/fdmgr.cpp

"../../../src/libCom/fdmgr/fdManager.h", line 171: Warning: Conversion

of 64 bit type value to "const unsigned" causes truncation.

"../../../src/libCom/fdmgr/fdManager.h", line 171: Warning: Conversion

of 64 bit type value to "const unsigned" causes truncation.

"../../../src/libCom/fdmgr/fdmgr.cpp", line 33: Warning: Conversion of

64 bit type value to "const unsigned" causes truncation.

I think we should create 3.14.8 and take care of this later.
I am concerned that fixing the 64 bit problems will in turn cause new bugs.

Marty

Jeff Hill wrote:

I get many many warning messages like:

"../../../include/epicsTime.h", line 328: Warning: Conversion of 64 bit
type value to "unsigned" causes truncation.

This is because the epicsTime has a 64 bit unsigned seconds field and the
network time stamp has a 32 bit unsigned seconds' field. I committed a fix
(which just suppresses the warning allowing truncation by design to
continue). Here is the comment in the source code.

 // epicsTime::secPastEpoch is based on ulong and has much greater range

 // on 64 bit hosts than the orginal epicsTimeStamp::secPastEpoch. The

 // epicsTimeStamp::secPastEpoch is based on epicsUInt32 so that it will

 // match the original network protocol. Of course one can anticipate

 // that eventually, a epicsUInt64 based network time stamp will be

 // introduced when 64 bit architectures are more ubiquitous.

   //
   // Truncation usually works fine here because the routines in this code
   // that compute time stamp differences and compare time stamps produce
   // good results when the operands are on either side of a time stamp

 // rollover as long as the difference between the operands does

 // not exceed 1/2 of full range.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System