[PATCH] manual: Add note to process.texi about MT-process fork (Bug 30159)

[Carlos O'Donell]

The forked child of an MT-process may only call AS-safe functions.
---
 manual/process.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/manual/process.texi b/manual/process.texi
index 9307379194..dfdf0923b4 100644
--- a/manual/process.texi
+++ b/manual/process.texi
@@ -316,6 +316,12 @@ 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.
+
 @end itemize
 
 @deftypefun pid_t _Fork (void)
-- 
2.39.2