select.poll() objects are not thread-safe in the free-threaded build

Bug report

The polling objects returned by select.poll and related functions are not thread-safe in the free-threaded build.

The fix might be as simple as adding critical sections to the functions on pollObject or it may require more work.

The following test exercises the thread-unsafe behavior:

./python -m test test_poll -m test_threaded_poll

Relevant object:

Lines 434 to 441 in 3ec719f

    
           typedef struct { 
        
               PyObject_HEAD 
        
               PyObject *dict; 
        
               int ufd_uptodate; 
        
               int ufd_len; 
        
               struct pollfd *ufds; 
        
               int poll_running; 
        
           } pollObject;

Linked PRs

pythongh-121592: Make select.poll() and related objects thread-safe

gh-121592: Make select.poll() and related objects thread-safe (#121594)

pythongh-121592: Make select.poll() and related objects thread-safe (p…

[3.13] gh-121592: Make select.poll() and related objects thread-safe (G…

pythongh-121592: Make select.poll() and related objects thread-safe (p…

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`select.poll()` objects are not thread-safe in the free-threaded build #121592

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	typedef struct {
	PyObject_HEAD
	PyObject *dict;
	int ufd_uptodate;
	int ufd_len;
	struct pollfd *ufds;
	int poll_running;
	} pollObject;

select.poll() objects are not thread-safe in the free-threaded build #121592

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`select.poll()` objects are not thread-safe in the free-threaded build #121592