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cpython/Include/internal/pycore_brc.h at issue-130160-httpserver · donbarbos/cpython · GitHub
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issue-130160-httpserver
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issue-130160-httpserver
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#ifndef
Py_INTERNAL_BRC_H
#define
Py_INTERNAL_BRC_H
#include
<stdint.h>
#include
"pycore_llist.h"
// struct llist_node
#include
"pycore_lock.h"
// PyMutex
#include
"pycore_object_stack.h"
// _PyObjectStack
#ifdef
__cplusplus
extern
"C"
{
#endif
#ifndef
Py_BUILD_CORE
# error
"this header requires Py_BUILD_CORE define"
#endif
#ifdef
Py_GIL_DISABLED
// Prime number to avoid correlations with memory addresses.
#define
_Py_BRC_NUM_BUCKETS
257
// Hash table bucket
struct
_brc_bucket
{
// Mutex protects both the bucket and thread state queues in this bucket.
PyMutex
mutex
;
// Linked list of _PyThreadStateImpl objects hashed to this bucket.
struct
llist_node
root
;
};
// Per-interpreter biased reference counting state
struct
_brc_state
{
// Hash table of thread states by thread-id. Thread states within a bucket
// are chained using a doubly-linked list.
struct
_brc_bucket
table
[
_Py_BRC_NUM_BUCKETS
];
};
// Per-thread biased reference counting state
struct
_brc_thread_state
{
// Linked-list of thread states per hash bucket
struct
llist_node
bucket_node
;
// Thread-id as determined by _PyThread_Id()
uintptr_t
tid
;
// Objects with refcounts to be merged (protected by bucket mutex)
_PyObjectStack
objects_to_merge
;
// Local stack of objects to be merged (not accessed by other threads)
_PyObjectStack
local_objects_to_merge
;
};
// Initialize/finalize the per-thread biased reference counting state
void
_Py_brc_init_thread
(
PyThreadState
*
tstate
);
void
_Py_brc_remove_thread
(
PyThreadState
*
tstate
);
// Initialize per-interpreter state
void
_Py_brc_init_state
(
PyInterpreterState
*
interp
);
void
_Py_brc_after_fork
(
PyInterpreterState
*
interp
);
// Enqueues an object to be merged by it's owning thread (tid). This
// steals a reference to the object.
void
_Py_brc_queue_object
(
PyObject
*
ob
);
// Merge the refcounts of queued objects for the current thread.
void
_Py_brc_merge_refcounts
(
PyThreadState
*
tstate
);
#endif
/* Py_GIL_DISABLED */
#ifdef
__cplusplus
}
#endif
#endif
/* !Py_INTERNAL_BRC_H */
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