diff options
| -rw-r--r-- | run-command.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/run-command.c b/run-command.c index 615b6e9c9..df1edd963 100644 --- a/run-command.c +++ b/run-command.c @@ -537,6 +537,15 @@ fail_pipe: prepare_cmd(&argv, cmd); childenv = prep_childenv(cmd->env); + /* + * NOTE: In order to prevent deadlocking when using threads special + * care should be taken with the function calls made in between the + * fork() and exec() calls. No calls should be made to functions which + * require acquiring a lock (e.g. malloc) as the lock could have been + * held by another thread at the time of forking, causing the lock to + * never be released in the child process. This means only + * Async-Signal-Safe functions are permitted in the child. + */ cmd->pid = fork(); failed_errno = errno; if (!cmd->pid) { |