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libexpr: use thread_local to make the parser thread-safe

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If we call `adjustLoc`, the global variable `prev_yylloc` is shared
between threads and racy.

Currently, nix itself does not concurrently parsing files, but this is
helpful for libexpr users. (The parser is thread-safe except this.)
This commit is contained in:
Yingchi Long 2023-07-03 16:02:54 +08:00
parent 7b39a388b3
commit 3c90340fe6
1 changed files with 1 additions and 1 deletions
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2
src/libexpr/lexer.l
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@ -36,7 +36,7 @@ static inline PosIdx makeCurPos(const YYLTYPE & loc, ParseData * data)
#define CUR_POS makeCurPos(*yylloc, data)
// backup to recover from yyless(0)
YYLTYPE prev_yylloc;
thread_local YYLTYPE prev_yylloc;
static void initLoc(YYLTYPE * loc)
{