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8 Commits

Author SHA1 Message Date
Victor Stinner 52d1477566
gh-110850: Rename internal PyTime C API functions (#115734) 
Rename functions:

* _PyTime_GetSystemClock() => _PyTime_TimeUnchecked()
* _PyTime_GetPerfCounter() => _PyTime_PerfCounterUnchecked()
* _PyTime_GetMonotonicClock() => _PyTime_MonotonicUnchecked()
* _PyTime_GetSystemClockWithInfo() => _PyTime_TimeWithInfo()
* _PyTime_GetMonotonicClockWithInfo() => _PyTime_MonotonicWithInfo()
* _PyTime_GetMonotonicClockWithInfo() => _PyTime_MonotonicWithInfo()

Changes:

* Remove "typedef PyTime_t PyTime_t;" which was
  "typedef PyTime_t _PyTime_t;" before a previous rename.
* Update comments of "Unchecked" functions.
* Remove invalid PyTime_Time() comment.
 2024-02-20 22:16:37 +00:00
Victor Stinner d207c7cd5a
gh-110850: Cleanup pycore_time.h includes (#115724) 
<pycore_time.h> include is no longer needed to get the PyTime_t type
in internal header files. This type is now provided by <Python.h>
include. Add <pycore_time.h> includes to C files instead.
 2024-02-20 16:50:43 +00:00
Victor Stinner 9af80ec83d
gh-110850: Replace _PyTime_t with PyTime_t (#115719) 
Run command:

sed -i -e 's!\<_PyTime_t\>!PyTime_t!g' $(find -name "*.c" -o -name "*.h")
 2024-02-20 15:02:27 +00:00
Dino Viehland ae460d450a
gh-113743: Make the MRO cache thread-safe in free-threaded builds (#113930) 
Makes _PyType_Lookup thread safe, including:
    Thread safety of the underlying cache.
    Make mutation of mro and type members thread safe
    Also _PyType_GetMRO and _PyType_GetBases are currently returning borrowed references which aren't safe.
 2024-02-15 10:54:57 -08:00
Sam Gross 5ae75e1be2
gh-111964: Add _PyRWMutex a "readers-writer" lock (gh-112859) 
This adds `_PyRWMutex`, a "readers-writer" lock, which wil be used to
serialize global stop-the-world pauses with per-interpreter pauses.
 2023-12-15 18:56:55 -07:00
Hugo van Kemenade 3b3ec0d77f
gh-111863: Rename `Py_NOGIL` to `Py_GIL_DISABLED` (#111864) 
Rename Py_NOGIL to Py_GIL_DISABLED
 2023-11-20 15:52:00 +02:00
Sam Gross 446f18a911
gh-111956: Add thread-safe one-time initialization. (gh-111960) 2023-11-16 12:19:54 -07:00
Sam Gross 0c89056fe5
gh-108724: Add PyMutex and _PyParkingLot APIs (gh-109344) 
PyMutex is a one byte lock with fast, inlineable lock and unlock functions for the common uncontended case.  The design is based on WebKit's WTF::Lock.

PyMutex is built using the _PyParkingLot APIs, which provides a cross-platform futex-like API (based on WebKit's WTF::ParkingLot).  This internal API will be used for building other synchronization primitives used to implement PEP 703, such as one-time initialization and events.

This also includes tests and a mini benchmark in Tools/lockbench/lockbench.py to compare with the existing PyThread_type_lock.

Uncontended acquisition + release:
* Linux (x86-64): PyMutex: 11 ns, PyThread_type_lock: 44 ns
* macOS (arm64): PyMutex: 13 ns, PyThread_type_lock: 18 ns
* Windows (x86-64): PyMutex: 13 ns, PyThread_type_lock: 38 ns

PR Overview:

The primary purpose of this PR is to implement PyMutex, but there are a number of support pieces (described below).

* PyMutex:  A 1-byte lock that doesn't require memory allocation to initialize and is generally faster than the existing PyThread_type_lock.  The API is internal only for now.
* _PyParking_Lot:  A futex-like API based on the API of the same name in WebKit.  Used to implement PyMutex.
* _PyRawMutex:  A word sized lock used to implement _PyParking_Lot.
* PyEvent:  A one time event.  This was used a bunch in the "nogil" fork and is useful for testing the PyMutex implementation, so I've included it as part of the PR.
* pycore_llist.h:  Defines common operations on doubly-linked list.  Not strictly necessary (could do the list operations manually), but they come up frequently in the "nogil" fork. ( Similar to https://man.freebsd.org/cgi/man.cgi?queue)

---------

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
 2023-09-19 09:54:29 -06:00