Mercurial > hg
view Makefile @ 48793:6e559391f96e
tracked-key: remove the dual write and rename to tracked-hint
The dual-write approach was mostly useless. As explained in the previous version
of the help, the key had to be read twice before we could cache a value.
However this "read twice" limitation actually also apply to any usage of the
key. If some operation wants to rely of the "same value == same tracked set"
property it would need to read the value before, and after running that
operation (or at least, after, in all cases). So it cannot be sure the operation
it did is "valid" until checking the key after the operation. As a resultat such
operation can only be read-only or rollbackable.
This reduce the utility of the "same value == same tracked set" a lot.
So it seems simpler to drop the double write and to update the documentation to
highlight that this file does not garantee race-free operation. As a result the
"key" is demoted to a "hint".
Documentation is updated accordingly.
Differential Revision: https://phab.mercurial-scm.org/D12201
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Thu, 17 Feb 2022 07:34:49 +0100 |
parents | 6387562e68b3 |
children | 649ff7f86f96 |
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# If you want to change PREFIX, do not just edit it below. The changed # value wont get passed on to recursive make calls. You should instead # override the variable on the command like: # # % make PREFIX=/opt/ install export PREFIX=/usr/local # Default to Python 3. # # Windows ships Python 3 as `python.exe`, which may not be on PATH. py.exe is. ifeq ($(OS),Windows_NT) PYTHON?=py -3 else PYTHON?=python3 endif PYOXIDIZER?=pyoxidizer $(eval HGROOT := $(shell pwd)) HGPYTHONS ?= $(HGROOT)/build/pythons PURE= PYFILESCMD=find mercurial hgext doc -name '*.py' PYFILES:=$(shell $(PYFILESCMD)) DOCFILES=mercurial/helptext/*.txt export LANGUAGE=C export LC_ALL=C TESTFLAGS ?= $(shell echo $$HGTESTFLAGS) OSXVERSIONFLAGS ?= $(shell echo $$OSXVERSIONFLAGS) CARGO = cargo # Set this to e.g. "mingw32" to use a non-default compiler. 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