clear need_locks in child after fork

the child is single-threaded, but may still need to synchronize with
last changes made to memory by another thread in the parent, so set
need_locks to -1 whereby the next lock-taker will drop to 0 and
prevent further barriers/locking.

diff --git a/src/process/fork.c b/src/process/fork.c
index fb42478..7e984ff 100644 (file)
--- a/src/process/fork.c
+++ b/src/process/fork.c
@@ -30,6 +30,7 @@ pid_t fork(void)
                self->next = self->prev = self;
                __thread_list_lock = 0;
                libc.threads_minus_1 = 0;
+               if (libc.need_locks) libc.need_locks = -1;
        }
        __restore_sigs(&set);
        __fork_handler(!ret);