tspy/2

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Predicate tspy/2

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Documentation
- Reference manual
  - Multithreaded applications
    - Thread support library(threadutil)
      - Debugging threads
        
        attach_console/0
        
        tdebug/1
        
        tdebug/0
        
        tnodebug/1
        
        tnodebug/0
        
        tspy/2
        
        tspy/1
- Packages

Availability::- use_module(library(threadutil)).(can be autoloaded)

tspy(:Spec, +ThreadId)

Set a spy point as spy/1 and enable the thread for debugging using tdebug/1. Note that a spy point is a global flag on a predicate that is visible from all threads. Spy points are honoured in all threads that are in debug mode and ignored in threads that are in nodebug mode.