Record useful info from Jeremy.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3529

diff --git a/THREADS_SYSCALLS_SIGNALS.txt b/THREADS_SYSCALLS_SIGNALS.txt
index 3f06d7108a4bfdbb7049a84f4e69d6cfe27bbc2f..5a083c12226dc6eb5ed9b819247fb5846b5fbee4 100644 (file)
--- a/THREADS_SYSCALLS_SIGNALS.txt
+++ b/THREADS_SYSCALLS_SIGNALS.txt
@@ -19,6 +19,13 @@ extern void VG_(set_sleeping) ( ThreadId tid, ThreadStatus state );
 
 The master semaphore is run_sema in vg_scheduler.c.
 
+
+(what happens at a fork?)
+
+VG_(scheduler_init) registers sched_fork_cleanup as a child atfork
+handler.  sched_fork_cleanup, among other things, reinitializes the
+semaphore with a new pipe so the process has its own.
+
 --------------------------------------------------------------------
 
 Re:   New World signal handling