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Edit File : pycore_gil.h \| Size : 1.53 KB
#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 */ Back

Edit File : pycore_gil.h | Size : 1.53 KB

#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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