mnt: inform user of slow mountlist scan

This will inform the user of why cmogstored may be slow
to start, since we need the mountlist to be populated at
startup.

We also throw a pthread_cancel() in there to load libgcc_s under
glibc, so we can avoid loading libgcc_s once we're under FD pressure.
This makes test/http_idle_expire.rb more reliable.

1 files changed, 21 insertions, 0 deletions

diff --git a/sig.c b/sig.c
index 63a40fe..7fa2708 100644
--- a/sig.c
+++ b/sig.c
@@ -23,3 +23,24 @@ void mog_intr_enable(void)
         CHECK(int, 0, sigemptyset(&set));
         CHECK(int, 0, pthread_sigmask(SIG_SETMASK, &set, NULL));
 }
+
+/* thread-safe, interruptible sleep, negative seconds -> sleep forever */
+void mog_sleep(long seconds)
+{
+        sigset_t set;
+        struct timespec ts;
+        struct timespec *tsp;
+
+        if (seconds < 0) {
+                tsp = NULL;
+        } else {
+                ts.tv_sec = seconds;
+                ts.tv_nsec = 0;
+                tsp = &ts;
+        }
+
+        CHECK(int, 0, sigemptyset(&set));
+        if (pselect(0, NULL, NULL, NULL, tsp, &set) < 0)
+                assert((errno == EINTR || errno == ENOMEM) &&
+                       "BUG in pselect usage");
+}