From 0c7f84ca41ebd871615426b9a159922422701859 Mon Sep 17 00:00:00 2001 From: Brad King Date: Mon, 19 May 2014 10:53:51 -0400 Subject: [PATCH] KWSys Process: Workaround child kill trouble on Cygwin When we kill a child we send SIGSTOP first so that we can traverse its child processes recursively. On unwinding the recursion we then send SIGKILL. Current Cygwin has trouble when both signals are sent in quick succession by the parent process. Add a usleep(1) after sending the first signal to give up our time slice and give Cygwin a chance to process the first signal before sending the second. --- Source/kwsys/ProcessUNIX.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Source/kwsys/ProcessUNIX.c b/Source/kwsys/ProcessUNIX.c index faeb96793..241e29573 100644 --- a/Source/kwsys/ProcessUNIX.c +++ b/Source/kwsys/ProcessUNIX.c @@ -2413,6 +2413,12 @@ static void kwsysProcessKill(pid_t process_id) /* Suspend the process to be sure it will not create more children. */ kill(process_id, SIGSTOP); +#if defined(__CYGWIN__) + /* Some Cygwin versions seem to need help here. Give up our time slice + so that the child can process SIGSTOP before we send SIGKILL. */ + usleep(1); +#endif + /* Kill all children if we can find them. */ #if defined(__linux__) || defined(__CYGWIN__) /* First try using the /proc filesystem. */