A NOTE has been added to this issue. ====================================================================== https://austingroupbugs.net/view.php?id=708 ====================================================================== Reported By: dalias Assigned To: ====================================================================== Project: 1003.1(2013)/Issue7+TC1 Issue ID: 708 Category: System Interfaces Type: Enhancement Request Severity: Editorial Priority: normal Status: New Name: Rich Felker Organization: musl libc User Reference: Section: XSH 2.9.1 Thread-Safety Page Number: unknown Line Number: unknown Interp Status: --- Final Accepted Text: ====================================================================== Date Submitted: 2013-06-07 21:23 UTC Last Modified: 2023-08-14 16:25 UTC ====================================================================== Summary: Make mblen, mbtowc, and wctomb thread-safe for alignment with C11 ======================================================================
---------------------------------------------------------------------- (0006433) geoffclare (manager) - 2023-08-14 16:25 https://austingroupbugs.net/view.php?id=708#c6433 ---------------------------------------------------------------------- In all of these changes the placeholder <i>XXXX</i> should be replaced with the name of the function. Page and line numbers are for Issue 8 draft 2.1. On page 1274 line 42635 section mblen(), and page 1285 line 42996 section mbtowc(), and page 2255 line 72488 section wctomb(), change:<blockquote>The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-202x defers to the ISO C standard.</blockquote>to:<blockquote>Except for requirements relating to data races, the functionality described on this reference page is aligned with the ISO C standard. Any other conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-202x defers to the ISO C standard for all <i>XXXX</i>() functionality except in relation to data races.</blockquote> On page 1274 line 42652 section mblen(), and page 1285 line 43015 section mbtowc(), and page 2255 line 72505 section wctomb(), change:<blockquote>[CX]The <i>XXXX</i>() function need not be thread-safe.[/CX]</blockquote>to:<blockquote>The <i>XXXX</i>() function [CX]need not be thread-safe; however, it[/CX] shall avoid data races with all other functions.</blockquote> On page 1274 line 42669 section mblen(), and page 1286 line 43032 section mbtowc(), and page 2255 line 72522 section wctomb(), change RATIONALE from "None" to:<blockquote>When the ISO C standard introduced threads in C11, it required <i>XXXX</i>() to avoid data races (with itself as well as with other functions), whereas POSIX.1-2008 did not require it to be thread-safe, and in many implementations it did not avoid data races with itself and still does not. The ISO C committee intend to change the requirements in a future version of the ISO C standard, but since POSIX.1 currently refers to C17 it is necessary for it not to defer to the ISO C standard regarding data races in order to continue to allow this function not to avoid data races with itself.</blockquote> On page 1274 line 42669 section mblen(), and page 1286 line 43034 section mbtowc(), and page 2256 line 72524 section wctomb(), change FUTURE DIRECTIONS from "None" to:<blockquote>It is expected that a change in a future version of the ISO C standard will allow a future version of this standard to remove the data race exception from the statement that it defers to the ISO C standard.</blockquote> Issue History Date Modified Username Field Change ====================================================================== 2013-06-07 21:23 dalias New Issue 2013-06-07 21:23 dalias Name => Rich Felker 2013-06-07 21:23 dalias Organization => musl libc 2013-06-07 21:23 dalias Section => XSH 2.9.1 Thread-Safety 2013-06-07 21:23 dalias Page Number => unknown 2013-06-07 21:23 dalias Line Number => unknown 2013-06-08 09:12 geoffclare Note Added: 0001647 2013-06-08 09:13 geoffclare Tag Attached: C11 2013-06-08 12:14 dalias Note Added: 0001648 2013-06-13 15:35 nick Note Added: 0001651 2013-12-03 21:09 torvald Issue Monitored: torvald 2022-08-15 15:11 nick Note Added: 0005933 2023-01-26 12:11 geoffclare Note Added: 0006139 2023-08-14 16:25 geoffclare Note Added: 0006433 ======================================================================
