Michael Felt <aixto...@felt.demon.nl> added the comment:
OK, I have gone as far back as "where" in dbx can bring me.
Could this, somehow, be related with changes made in issue-33015 ?
In any case, does it seem correct that "pthread_wrapper(void *arg) can be
correct if arg is nil?
+155 /* bpo-33015: pythread_callback struct and pythread_wrapper() cast
+156 "void func(void *)" to "void* func(void *)": always return NULL.
+157
+158 PyThread_start_new_thread() uses "void func(void *)" type, whereas
+159 pthread_create() requires a void* return value. */
+160 typedef struct {
+161 void (*func) (void *);
+162 void *arg;
+163 } pythread_callback;
+164
+165 static void *
+166 pythread_wrapper(void *arg)
+167 {
+168 /* copy func and func_arg and free the temporary structure */
+169 pythread_callback *callback = arg;
+170 void (*func)(void *) = callback->func;
+171 void *func_arg = callback->arg;
+172 PyMem_RawFree(arg);
+173
+174 func(func_arg);
+175 return NULL;
+176 }
(dbx) print boot
0x2030cab0
(dbx) which boot
_threadmodule.t_bootstrap.boot
(dbx) print boot
0x2030cab0
(dbx) print *boot
(interp = 0x2030cb00, func = 0xcbcbcbcb, args = 0x1018c460, keyw = 0xcbcbcbcb,
tstate = 0xcbcbcbcb)
(dbx) which arg
thread.pythread_wrapper.arg
(dbx) print arg
(nil)
(dbx) print *arg
reference through nil pointer
(dbx) which callback
thread.pythread_wrapper.callback
(dbx) print callback
0x2030cb00
(dbx) print *callback
(func = 0x2030cb50, arg = 0x35000000)
I am "nervous" when it comes to accepting a value such as 0xcbcbcbcb or
0xdbdbdbdb as values for pointers to objects - or even "int" or unsigned values
- look so "specific pattern" like.
Suggestions on how to look at this "better" would be appreciated.
Michael
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<https://bugs.python.org/issue35828>
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