cpython.git/Python, branch v3.7.0b2

bpo-32838: Fix Python versions in the table of magic numbers. (GH-5658)

2018-02-23T19:01:54Z

(cherry picked from commit 4af8fd561433826ac897c55e41a087a5c5dbacf3)

Co-authored-by: Serhiy Storchaka

bpo-32604: Swap threads only if the interpreter is different. (gh-5783)

2018-02-21T00:09:41Z

The CPython runtime assumes that there is a one-to-one relationship (for a given interpreter) between PyThreadState and OS threads. Sending and receiving on a channel in the same interpreter was causing crashes because of this (specifically due to a check in PyThreadState_Swap()). The solution is to not switch threads if the interpreter is the same.
(cherry picked from commit f53d9f2778a87bdd48eb9030f782a4ebf9e7622f)

Co-authored-by: Eric Snow

bpo-32869: Fix incorrect dst buffer size for MultiByteToWideChar (GH-5739)

2018-02-18T18:40:07Z

This function expects the destination buffer size to be given
in wide characters, not bytes.
(cherry picked from commit b3b4a9d3001f1fc7df8efcccdce081de54fa5eab)

Co-authored-by: Alexey Izbyshev

bpo-32604: Clean up created subinterpreters before runtime finalization. (gh-5710)

2018-02-17T02:15:24Z

(cherry picked from commit 4c6955e2b0ccf88c705f8d1fac685a8e65f9699e)

Co-authored-by: Eric Snow

Fix some warnings produced by different compilers. (GH-5593) (GH-5600)

2018-02-09T15:56:34Z

(cherry picked from commit bfe4fd5f2e96e72eecb5b8a0c7df0ac1689f3b7e)

Co-authored-by: Serhiy Storchaka

bpo-32777: Fix _Py_set_inheritable async-safety in subprocess (GH-5560) (GH-5562)

2018-02-06T06:31:22Z

Fix a rare but potential pre-exec child process deadlock in subprocess on POSIX systems when marking file descriptors inheritable on exec in the child process.  This bug appears to have been introduced in 3.4 with the inheritable file descriptors support.

This also changes Python/fileutils.c `set_inheritable` to use the "slow" two `fcntl` syscall path instead of the "fast" single `ioctl` syscall path when asked to be async signal safe (by way of being asked not to raise exceptions).  `ioctl` is not a POSIX async-signal-safe approved function.

ref: http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html
(cherry picked from commit c1e46e94de38a92f98736af9a42d89c3975a9919)

Co-authored-by: Alexey Izbyshev

[3.7] bpo-32746: Fix multiple typos (GH-5144) (GH-5520)

2018-02-04T01:41:43Z

Fix typos found by codespell in docs, docstrings, and comments.
(cherry picked from commit c3d9508ff22ece9a96892b628dd5813e2fb0cd80)

Co-authored-by: Leo Arias

bpo-32604: Fix memory leaks in the new _xxsubinterpreters module. (GH-5507)

2018-02-03T05:38:57Z

(cherry picked from commit 4e9da0d163731caa79811c723c703ee416c31826)

Co-authored-by: Eric Snow

bpo-32303 - Consistency fixes for namespace loaders (GH-5481) (#5503)

2018-02-03T00:49:25Z

* Make sure ``__spec__.loader`` matches ``__loader__`` for namespace packages.
* Make sure ``__spec__.origin` matches ``__file__`` for namespace packages.

https://bugs.python.org/issue32303
https://bugs.python.org/issue32305
(cherry picked from commit bbbcf8693b876daae4469765aa62f8924f39a7d2)

Co-authored-by: Barry Warsaw

bpo-32674: Improve the docstring for import (GH-5339) (GH-5488)

2018-02-02T04:51:36Z

Clarify that the level argument is used to determine whether to
perform absolute or relative imports: 0 is absolute, while a positive number
is the number of parent directories to search relative to the current module.
(cherry picked from commit 461d225b195eec5269f317323b41115516144c41)

Co-authored-by: oldk