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Atomic fast path for "locale" encoding registration

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The "locale" encoding is only registered once, so we can use an atomic
to avoid the full lock and hash lookup.
This commit is contained in:
John Hawthorn 2026-05-29 10:18:53 -07:00
parent de5545202d
commit d901035136
Notes: git 2026-05-29 18:30:17 +00:00 
Merged: https://github.com/ruby/ruby/pull/17153
1 changed files with 7 additions and 5 deletions
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12
encoding.c
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@ -98,6 +98,7 @@ static rb_encoding *global_enc_ascii,
*global_enc_us_ascii;
static int filesystem_encindex = ENCINDEX_ASCII_8BIT;
static rb_atomic_t locale_alias_registered;
#define GLOBAL_ENC_TABLE_LOCKING(tbl) \
for (struct enc_table *tbl = &global_enc_table, **locking = &tbl; \
@ -1568,15 +1569,16 @@ rb_locale_encindex(void)
if (idx < 0) idx = ENCINDEX_UTF_8;
GLOBAL_ENC_TABLE_LOCKING(enc_table) {
if (enc_registered(enc_table, "locale") < 0) {
if (!RUBY_ATOMIC_LOAD(locale_alias_registered)) {
GLOBAL_ENC_TABLE_LOCKING(enc_table) {
if (enc_registered(enc_table, "locale") < 0) {
# if defined _WIN32
void Init_w32_codepage(void);
Init_w32_codepage();
void Init_w32_codepage(void);
Init_w32_codepage();
# endif
GLOBAL_ENC_TABLE_LOCKING(enc_table) {
enc_alias_internal(enc_table, "locale", idx);
}
RUBY_ATOMIC_SET(locale_alias_registered, 1);
}
}