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Editing: pycore_gil.h
#ifndef Py_INTERNAL_GIL_H #define Py_INTERNAL_GIL_H #ifdef __cplusplus extern "C" { #endif #ifndef Py_BUILD_CORE # error "this header requires Py_BUILD_CORE define" #endif #include "pycore_atomic.h" /* _Py_atomic_address */ #include "pycore_condvar.h" /* PyCOND_T */ #ifndef Py_HAVE_CONDVAR # error You need either a POSIX-compatible or a Windows system! #endif /* Enable if you want to force the switching of threads at least every `interval`. */ #undef FORCE_SWITCHING #define FORCE_SWITCHING struct _gil_runtime_state { /* microseconds (the Python API uses seconds, though) */ unsigned long interval; /* Last PyThreadState holding / having held the GIL. This helps us know whether anyone else was scheduled after we dropped the GIL. */ _Py_atomic_address last_holder; /* Whether the GIL is already taken (-1 if uninitialized). This is atomic because it can be read without any lock taken in ceval.c. */ _Py_atomic_int locked; /* Number of GIL switches since the beginning. */ unsigned long switch_number; /* This condition variable allows one or several threads to wait until the GIL is released. In addition, the mutex also protects the above variables. */ PyCOND_T cond; PyMUTEX_T mutex; #ifdef FORCE_SWITCHING /* This condition variable helps the GIL-releasing thread wait for a GIL-awaiting thread to be scheduled and take the GIL. */ PyCOND_T switch_cond; PyMUTEX_T switch_mutex; #endif }; #ifdef __cplusplus } #endif #endif /* !Py_INTERNAL_GIL_H */
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