| Message ID | 20230223223728.423748-1-carlos@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] manual: Add note to process.texi about MT-process fork (Bug 30159) | expand |
* Carlos O'Donell: > The forked child of an MT-process may only call AS-safe functions. > --- > manual/process.texi | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/manual/process.texi b/manual/process.texi > index 9307379194..c712fe3a26 100644 > --- a/manual/process.texi > +++ b/manual/process.texi > @@ -316,6 +316,18 @@ The child doesn't inherit alarms set by the parent process. > The set of pending signals (@pxref{Delivery of Signal}) for the child > process is cleared. (The child process inherits its mask of blocked > signals and signal actions from the parent process.) > + > +@item > +In the case of a multi-threaded parent, the child process may only > +safely call asynchronous-signal-safe functions until the process is > +replaced with a call to an @code{exec} family function. > + > +As an extension relative to POSIX, @theglibc{} supports calling > +@code{malloc} and other allocation functions after @code{fork}. This > +only applies to the standard @code{malloc}. Whether this extension is > +supported by replacement @code{malloc} implementations depends on the > +replacement. @xref{Replacing malloc}. > + > @end itemize My only remaining comment is that this new item isn't really about a process attribute as such. Thanks, Florian
diff --git a/manual/process.texi b/manual/process.texi index 9307379194..c712fe3a26 100644 --- a/manual/process.texi +++ b/manual/process.texi @@ -316,6 +316,18 @@ The child doesn't inherit alarms set by the parent process. The set of pending signals (@pxref{Delivery of Signal}) for the child process is cleared. (The child process inherits its mask of blocked signals and signal actions from the parent process.) + +@item +In the case of a multi-threaded parent, the child process may only +safely call asynchronous-signal-safe functions until the process is +replaced with a call to an @code{exec} family function. + +As an extension relative to POSIX, @theglibc{} supports calling +@code{malloc} and other allocation functions after @code{fork}. This +only applies to the standard @code{malloc}. Whether this extension is +supported by replacement @code{malloc} implementations depends on the +replacement. @xref{Replacing malloc}. + @end itemize @deftypefun pid_t _Fork (void)