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view mercurial/help/revisions.txt @ 20208:61a47fd64f30 stable
fileset, revset: do not use global parser object for thread safety
parse() cannot be called at the same time because a parser object keeps its
states. This is no problem for command-line hg client, but it would cause
strange errors in multi-threaded hgweb.
Creating parser object is not too expensive.
original:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 11.3 usec per loop
thread-safe:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 13.1 usec per loop
| author | Yuya Nishihara <yuya@tcha.org> |
|---|---|
| date | Sat, 21 Dec 2013 12:44:19 +0900 |
| parents | 43cfe56121d3 |
| children | 4edd179fefb8 |
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Mercurial supports several ways to specify individual revisions. A plain integer is treated as a revision number. Negative integers are treated as sequential offsets from the tip, with -1 denoting the tip, -2 denoting the revision prior to the tip, and so forth. A 40-digit hexadecimal string is treated as a unique revision identifier. A hexadecimal string less than 40 characters long is treated as a unique revision identifier and is referred to as a short-form identifier. A short-form identifier is only valid if it is the prefix of exactly one full-length identifier. Any other string is treated as a bookmark, tag, or branch name. A bookmark is a movable pointer to a revision. A tag is a permanent name associated with a revision. A branch name denotes the tipmost revision of that branch. Bookmark, tag, and branch names must not contain the ":" character. The reserved name "tip" always identifies the most recent revision. The reserved name "null" indicates the null revision. This is the revision of an empty repository, and the parent of revision 0. The reserved name "." indicates the working directory parent. If no working directory is checked out, it is equivalent to null. If an uncommitted merge is in progress, "." is the revision of the first parent.