Improve graceful shutdown.

configure.ac

@@ -176,15 +176,13 @@ AC_ARG_ENABLE([mime-sanity-check],
 AC_MSG_RESULT([$enable_mime_sanity_check])
 
 # Enable code coverage instrumentation only if requested by the user.
-use_gcov=0
 AC_MSG_CHECKING([whether to code coverage])
 AC_ARG_ENABLE([coverage],
   [AS_HELP_STRING([--enable-coverage],[generate code coverage instrumentation])],
-  [use_gcov=1],
+  [],
   [enable_coverage=no]
 )
 AC_MSG_RESULT([$enable_coverage])
-AC_SUBST(use_gcov)
 
 #
 # Enable -Werror. We want this enabled by default for developers, but disabled by default

doc/appendices/command-line/traffic_server.en.rst

@@ -97,4 +97,26 @@ Environment
 
 .. envvar:: PROXY_REMOTE_MGMT
 
+This environment variable forces :program:`traffic_server` to believe that it is being managed by
+:program:`traffic_manager`.
+
 .. envvar:: PROXY_AUTO_EXIT
+
+When this environment variable is set to an integral number of
+seconds, :program:`traffic_server` will exit that many seconds after
+startup. This is primarily useful for testing.
+
+Signals
+=======
+
+On `SIGTERM`, :program:`traffic_server` exits.
+
+On `SIGUSR1`, :program:`traffic_server` logs its current memory usage.
+
+On `SIGUSR2`, :program:`traffic_server` re-opens its standard error and standard out file descriptors.
+
+See also
+========
+
+:manpage:`traffic_ctl(8)`,
+:manpage:`traffic_manager(8)`

lib/ts/ink_config.h.in

@@ -58,7 +58,6 @@
 #define TS_HAS_IN6_IS_ADDR_UNSPECIFIED @has_in6_is_addr_unspecified@
 #define TS_HAS_BACKTRACE @has_backtrace@
 #define TS_HAS_PROFILER @has_profiler@
-#define TS_USE_GCOV @use_gcov@
 #define TS_USE_FAST_SDK @use_fast_sdk@
 #define TS_USE_DIAGS @use_diags@
 #define TS_USE_EPOLL @use_epoll@

lib/ts/ink_thread.h

@@ -213,6 +213,12 @@ ink_thread_sigsetmask(int how, const sigset_t *set, sigset_t *oset)
   return (pthread_sigmask(how, set, oset));
 }
 
+static inline int
+ink_thread_kill(ink_thread t, int sig)
+{
+  return pthread_kill(t, sig);
+}
+
 /*******************************************************************
  * Posix Semaphores
  ******************************************************************/

mgmt/BaseManager.cc

@@ -145,7 +145,8 @@ BaseManager::signalMgmtEntity(int msg_id, char *data_raw, int data_len)
     mh->msg_id   = msg_id;
     mh->data_len = 0;
   }
-  ink_assert(enqueue(mgmt_event_queue, mh));
+
+  ink_release_assert(enqueue(mgmt_event_queue, mh));
   return msg_id;
 
 } /* End BaseManager::signalMgmtEntity */