diff -Nru libcoro-perl-6.514/Changes libcoro-perl-6.520/Changes
--- libcoro-perl-6.514/Changes	2017-08-31 16:25:35.000000000 +0000
+++ libcoro-perl-6.520/Changes	2018-08-14 16:50:12.000000000 +0000
@@ -5,6 +5,15 @@
 TODO: __GCC_HAVE_DWARF2_CFI_ASM
 TODO: swap_sv, maybe add scope_swap_sv?
 TODO: croak when async_pool tries to run canceled thread?
+TODO: how to debug safe_cancel failure (vebrose mode? show how to make backtrace?)
+TODO: scalar context for Coro::AIO wrappers?
+
+6.52  Tue Aug 14 18:49:43 CEST 2018
+	- libcoro update: allow sharing of coro threads using the pthreads
+          backend among different pthreads, as is required by Coro::Multicore.
+	- always allow ->call and ->eval when the coro is the current coroutine. this
+          makes it possible, among other things, to call these on $Coro::main.
+	- minor code cleanups.
 
 6.514 Thu Aug 31 18:25:31 CEST 2017
 	- safe_cancel no longer croaks when called on already-destroyed
diff -Nru libcoro-perl-6.514/Coro/AIO.pm libcoro-perl-6.520/Coro/AIO.pm
--- libcoro-perl-6.514/Coro/AIO.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/AIO.pm	2018-08-14 16:50:39.000000000 +0000
@@ -69,7 +69,7 @@
 
 use base Exporter::;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 our @EXPORT    = (@IO::AIO::EXPORT, qw(aio_wait));
 our @EXPORT_OK = @IO::AIO::EXPORT_OK;
diff -Nru libcoro-perl-6.514/Coro/AnyEvent.pm libcoro-perl-6.520/Coro/AnyEvent.pm
--- libcoro-perl-6.514/Coro/AnyEvent.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/AnyEvent.pm	2018-08-14 16:50:39.000000000 +0000
@@ -163,7 +163,7 @@
 use Coro;
 use AnyEvent ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 #############################################################################
 # idle handler
diff -Nru libcoro-perl-6.514/Coro/BDB.pm libcoro-perl-6.520/Coro/BDB.pm
--- libcoro-perl-6.514/Coro/BDB.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/BDB.pm	2018-08-14 16:50:39.000000000 +0000
@@ -47,7 +47,7 @@
 
 use base Exporter::;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our $WATCHER;
 
 BDB::set_sync_prepare {
diff -Nru libcoro-perl-6.514/Coro/Channel.pm libcoro-perl-6.520/Coro/Channel.pm
--- libcoro-perl-6.514/Coro/Channel.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Channel.pm	2018-08-14 16:50:39.000000000 +0000
@@ -35,7 +35,7 @@
 use Coro ();
 use Coro::Semaphore ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 sub DATA (){ 0 }
 sub SGET (){ 1 }
diff -Nru libcoro-perl-6.514/Coro/Debug.pm libcoro-perl-6.520/Coro/Debug.pm
--- libcoro-perl-6.514/Coro/Debug.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Debug.pm	2018-08-14 16:50:39.000000000 +0000
@@ -120,7 +120,7 @@
 use Coro::AnyEvent ();
 use Coro::Timer ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 our %log;
 our $SESLOGLEVEL = exists $ENV{PERL_CORO_DEFAULT_LOGLEVEL} ? $ENV{PERL_CORO_DEFAULT_LOGLEVEL} : -1;
diff -Nru libcoro-perl-6.514/Coro/Handle.pm libcoro-perl-6.520/Coro/Handle.pm
--- libcoro-perl-6.514/Coro/Handle.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Handle.pm	2018-08-14 16:50:39.000000000 +0000
@@ -46,7 +46,7 @@
 
 use base 'Exporter';
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our @EXPORT = qw(unblock);
 
 =item $fh = new_from_fh Coro::Handle $fhandle [, arg => value...]
diff -Nru libcoro-perl-6.514/Coro/libcoro/coro.c libcoro-perl-6.520/Coro/libcoro/coro.c
--- libcoro-perl-6.514/Coro/libcoro/coro.c	2016-11-18 06:20:43.000000000 +0000
+++ libcoro-perl-6.520/Coro/libcoro/coro.c	2018-08-14 15:37:40.000000000 +0000
@@ -507,15 +507,6 @@
   coro_context *self, *main;
 };
 
-static pthread_t null_tid;
-
-/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
-static void
-mutex_unlock_wrapper (void *arg)
-{
-  pthread_mutex_unlock ((pthread_mutex_t *)arg);
-}
-
 static void *
 coro_init (void *args_)
 {
@@ -523,13 +514,8 @@
   coro_func func = args->func;
   void *arg = args->arg;
 
-  pthread_mutex_lock (&coro_mutex);
-
-  /* we try to be good citizens and use deferred cancellation and cleanup handlers */
-  pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
-    coro_transfer (args->self, args->main);
-    func (arg);
-  pthread_cleanup_pop (1);
+  coro_transfer (args->self, args->main);
+  func (arg);
 
   return 0;
 }
@@ -537,11 +523,25 @@
 void
 coro_transfer (coro_context *prev, coro_context *next)
 {
+  pthread_mutex_lock (&coro_mutex);
+
+  next->flags = 1;
   pthread_cond_signal (&next->cv);
-  pthread_cond_wait (&prev->cv, &coro_mutex);
-#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
-  pthread_testcancel ();
-#endif
+
+  prev->flags = 0;
+
+  while (!prev->flags)
+    pthread_cond_wait (&prev->cv, &coro_mutex);
+
+  if (prev->flags == 2)
+    {
+      pthread_mutex_unlock (&coro_mutex);
+      pthread_cond_destroy (&prev->cv);
+      pthread_detach (pthread_self ());
+      pthread_exit (0);
+    }
+
+  pthread_mutex_unlock (&coro_mutex);
 }
 
 void
@@ -554,9 +554,7 @@
     {
       once = 1;
 
-      pthread_mutex_lock (&coro_mutex);
       pthread_cond_init (&nctx.cv, 0);
-      null_tid = pthread_self ();
     }
 
   pthread_cond_init (&ctx->cv, 0);
@@ -565,6 +563,7 @@
     {
       pthread_attr_t attr;
       struct coro_init_args args;
+      pthread_t id;
 
       args.func = coro;
       args.arg  = arg;
@@ -582,26 +581,19 @@
       pthread_attr_setstack (&attr, sptr, (size_t)ssize);
 #endif
       pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
-      pthread_create (&ctx->id, &attr, coro_init, &args);
+      pthread_create (&id, &attr, coro_init, &args);
 
       coro_transfer (args.main, args.self);
     }
-  else
-    ctx->id = null_tid;
 }
 
 void
 coro_destroy (coro_context *ctx)
 {
-  if (!pthread_equal (ctx->id, null_tid))
-    {
-      pthread_cancel (ctx->id);
-      pthread_mutex_unlock (&coro_mutex);
-      pthread_join (ctx->id, 0);
-      pthread_mutex_lock (&coro_mutex);
-    }
-
-  pthread_cond_destroy (&ctx->cv);
+  pthread_mutex_lock (&coro_mutex);
+  ctx->flags = 2;
+  pthread_cond_signal (&ctx->cv);
+  pthread_mutex_unlock (&coro_mutex);
 }
 
 /*****************************************************************************/
diff -Nru libcoro-perl-6.514/Coro/libcoro/coro.h libcoro-perl-6.520/Coro/libcoro/coro.h
--- libcoro-perl-6.514/Coro/libcoro/coro.h	2016-11-18 06:21:55.000000000 +0000
+++ libcoro-perl-6.520/Coro/libcoro/coro.h	2018-08-14 15:36:28.000000000 +0000
@@ -87,6 +87,11 @@
  *            as it was reported to crash.
  * 2016-11-18 disable cfi_undefined again - backtraces might be worse, but
  *            compile compatibility is improved.
+ * 2018-08-14 use a completely different pthread strategy that should allow
+ *            sharing of coroutines among different threads. this would
+ *            undefined behaviour before as mutexes would be unlocked on
+ *            a different thread. overall, this might be slower than
+ *            using a pipe for synchronisation, but pipes eat fd's...
  */
 
 #ifndef CORO_H
@@ -406,8 +411,8 @@
 
 struct coro_context
 {
+  int flags;
   pthread_cond_t cv;
-  pthread_t id;
 };
 
 void coro_transfer (coro_context *prev, coro_context *next);
diff -Nru libcoro-perl-6.514/Coro/LWP.pm libcoro-perl-6.520/Coro/LWP.pm
--- libcoro-perl-6.514/Coro/LWP.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/LWP.pm	2018-08-14 16:50:39.000000000 +0000
@@ -126,7 +126,7 @@
 use Net::FTP ();
 use Net::NNTP ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 *Socket::inet_aton = \&Coro::Util::inet_aton;
 
diff -Nru libcoro-perl-6.514/Coro/MakeMaker.pm libcoro-perl-6.520/Coro/MakeMaker.pm
--- libcoro-perl-6.514/Coro/MakeMaker.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/MakeMaker.pm	2018-08-14 16:50:39.000000000 +0000
@@ -7,7 +7,7 @@
 
 our $installsitearch;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our @EXPORT_OK = qw(&coro_args $installsitearch);
 
 my %opt;
diff -Nru libcoro-perl-6.514/Coro/RWLock.pm libcoro-perl-6.520/Coro/RWLock.pm
--- libcoro-perl-6.514/Coro/RWLock.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/RWLock.pm	2018-08-14 16:50:39.000000000 +0000
@@ -38,7 +38,7 @@
 
 use Coro ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 =item $l = new Coro::RWLock;
 
diff -Nru libcoro-perl-6.514/Coro/Select.pm libcoro-perl-6.520/Coro/Select.pm
--- libcoro-perl-6.514/Coro/Select.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Select.pm	2018-08-14 16:50:39.000000000 +0000
@@ -67,7 +67,7 @@
 
 use base Exporter::;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our @EXPORT_OK = "select";
 
 sub import {
diff -Nru libcoro-perl-6.514/Coro/Semaphore.pm libcoro-perl-6.520/Coro/Semaphore.pm
--- libcoro-perl-6.514/Coro/Semaphore.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Semaphore.pm	2018-08-14 16:50:39.000000000 +0000
@@ -42,7 +42,7 @@
 
 use Coro ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 =item new [initial count]
 
diff -Nru libcoro-perl-6.514/Coro/SemaphoreSet.pm libcoro-perl-6.520/Coro/SemaphoreSet.pm
--- libcoro-perl-6.514/Coro/SemaphoreSet.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/SemaphoreSet.pm	2018-08-14 16:50:39.000000000 +0000
@@ -35,7 +35,7 @@
 
 use common::sense;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 use Coro::Semaphore ();
 
diff -Nru libcoro-perl-6.514/Coro/Signal.pm libcoro-perl-6.520/Coro/Signal.pm
--- libcoro-perl-6.514/Coro/Signal.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Signal.pm	2018-08-14 16:50:39.000000000 +0000
@@ -38,7 +38,7 @@
 
 use Coro::Semaphore ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 =item $sig = new Coro::Signal;
 
diff -Nru libcoro-perl-6.514/Coro/Socket.pm libcoro-perl-6.520/Coro/Socket.pm
--- libcoro-perl-6.514/Coro/Socket.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Socket.pm	2018-08-14 16:50:39.000000000 +0000
@@ -73,7 +73,7 @@
 
 use base qw(Coro::Handle IO::Socket::INET);
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 our (%_proto, %_port);
 
diff -Nru libcoro-perl-6.514/Coro/Specific.pm libcoro-perl-6.520/Coro/Specific.pm
--- libcoro-perl-6.514/Coro/Specific.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Specific.pm	2018-08-14 16:50:39.000000000 +0000
@@ -36,7 +36,7 @@
 
 use common::sense;
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 =item new
 
diff -Nru libcoro-perl-6.514/Coro/State.pm libcoro-perl-6.520/Coro/State.pm
--- libcoro-perl-6.514/Coro/State.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/State.pm	2018-08-14 16:50:39.000000000 +0000
@@ -93,7 +93,7 @@
 use XSLoader;
 
 BEGIN {
-   our $VERSION = 6.514;
+   our $VERSION = 6.52;
 
    # must be done here because the xs part expects it to exist
    # it might exist already because Coro::Specific created it.
diff -Nru libcoro-perl-6.514/Coro/State.xs libcoro-perl-6.520/Coro/State.xs
--- libcoro-perl-6.514/Coro/State.xs	2017-08-31 16:20:38.000000000 +0000
+++ libcoro-perl-6.520/Coro/State.xs	2018-08-14 16:48:18.000000000 +0000
@@ -5,6 +5,26 @@
 
 #include "libcoro/coro.c"
 
+#if CORO_UCONTEXT
+  #define CORO_BACKEND "ucontext"
+#elif CORO_SJLJ
+  #define CORO_BACKEND "sjlj"
+#elif CORO_LINUX
+  #define CORO_BACKEND "linux"
+#elif CORO_LOSER
+  #define CORO_BACKEND "loser"
+#elif CORO_FIBER
+  #define CORO_BACKEND "fiber"
+#elif CORO_IRIX
+  #define CORO_BACKEND "irix"
+#elif CORO_ASM
+  #define CORO_BACKEND "asm"
+#elif CORO_PTHREAD
+  #define CORO_BACKEND "pthread"
+#else
+  #define CORO_BACKEND "unknown"
+#endif
+
 #define PERL_NO_GET_CONTEXT
 #define PERL_EXT
 
@@ -1224,7 +1244,7 @@
     myop.op_flags = OPf_WANT_VOID;
 
     PUSHMARK (SP);
-    PUSHs ((SV *)coro->startcv);
+    XPUSHs ((SV *)coro->startcv);
     PUTBACK;
     PL_op = (OP *)&myop;
     PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
@@ -1382,8 +1402,8 @@
               PL_runops = RUNOPS_DEFAULT;
               ENTER;
               SAVETMPS;
-              EXTEND (SP, 3);
               PUSHMARK (SP);
+              EXTEND (SP, 3);
               PUSHs (&PL_sv_no);
               PUSHs (fullname);
               PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
@@ -1420,8 +1440,8 @@
                           PL_runops = RUNOPS_DEFAULT;
                           ENTER;
                           SAVETMPS;
-                          EXTEND (SP, 3);
                           PUSHMARK (SP);
+                          EXTEND (SP, 3);
                           PUSHs (&PL_sv_yes);
                           PUSHs (fullname);
                           PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc (SUB_ARGARRAY)) : &PL_sv_undef);
@@ -1444,9 +1464,8 @@
                       PL_runops = RUNOPS_DEFAULT;
                       ENTER;
                       SAVETMPS;
-                      EXTEND (SP, 3);
-                      PL_runops = RUNOPS_DEFAULT;
                       PUSHMARK (SP);
+                      EXTEND (SP, 2);
                       PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
                       PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
                       PUTBACK;
@@ -3677,6 +3696,8 @@
 
 	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
 
+        newCONSTSUB (coro_state_stash, "BACKEND", newSVpv (CORO_BACKEND, 0)); /* undocumented */
+
         newCONSTSUB (coro_state_stash, "CC_TRACE"     , newSViv (CC_TRACE));
         newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
         newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
@@ -3810,9 +3831,10 @@
         eval = 1
 	CODE:
 {
-        if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
+        struct coro *current = SvSTATE_current;
+
+        if ((coro == current) || (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot)))
           {
-            struct coro *current = SvSTATE_current;
             struct CoroSLF slf_save;
 
             if (current != coro)
diff -Nru libcoro-perl-6.514/Coro/Storable.pm libcoro-perl-6.520/Coro/Storable.pm
--- libcoro-perl-6.514/Coro/Storable.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Storable.pm	2018-08-14 16:50:39.000000000 +0000
@@ -84,7 +84,7 @@
 use Storable;
 use base "Exporter";
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our @EXPORT = qw(thaw freeze nfreeze blocking_thaw blocking_freeze blocking_nfreeze);
 
 our $GRANULARITY = 0.01;
diff -Nru libcoro-perl-6.514/Coro/Timer.pm libcoro-perl-6.520/Coro/Timer.pm
--- libcoro-perl-6.514/Coro/Timer.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Timer.pm	2018-08-14 16:50:39.000000000 +0000
@@ -28,7 +28,7 @@
 use Coro ();
 use Coro::AnyEvent ();
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 our @EXPORT_OK = qw(timeout sleep);
 
 # compatibility with older programs
diff -Nru libcoro-perl-6.514/Coro/Util.pm libcoro-perl-6.520/Coro/Util.pm
--- libcoro-perl-6.514/Coro/Util.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro/Util.pm	2018-08-14 16:50:39.000000000 +0000
@@ -41,7 +41,7 @@
 our @EXPORT = qw(gethostbyname gethostbyaddr);
 our @EXPORT_OK = qw(inet_aton fork_eval);
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 our $MAXPARALLEL = 16; # max. number of parallel jobs
 
diff -Nru libcoro-perl-6.514/Coro.pm libcoro-perl-6.520/Coro.pm
--- libcoro-perl-6.514/Coro.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Coro.pm	2018-08-14 16:50:39.000000000 +0000
@@ -368,7 +368,7 @@
 our $main;    # main coro
 our $current; # current coro
 
-our $VERSION = 6.514;
+our $VERSION = 6.52;
 
 our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub rouse_cb rouse_wait);
 our %EXPORT_TAGS = (
diff -Nru libcoro-perl-6.514/debian/changelog libcoro-perl-6.520/debian/changelog
--- libcoro-perl-6.514/debian/changelog	2017-10-29 15:14:17.000000000 +0000
+++ libcoro-perl-6.520/debian/changelog	2018-08-18 11:08:21.000000000 +0000
@@ -1,3 +1,20 @@
+libcoro-perl (6.520-1) unstable; urgency=medium
+
+  [ Damyan Ivanov ]
+  * declare conformance with Policy 4.1.3 (no changes needed)
+
+  [ Salvatore Bonaccorso ]
+  * Update Vcs-* headers for switch to salsa.debian.org
+
+  [ Xavier Guimard ]
+  * Import upstream version 6.520
+  * Declare conformance with Policy 4.2.0
+  * Bump debhelper compat level to 10
+  * Change hardening flags to +all
+  * Add "Multi-Arch: same"
+
+ -- Xavier Guimard <x.guimard@free.fr>  Sat, 18 Aug 2018 13:08:21 +0200
+
 libcoro-perl (6.514-1) unstable; urgency=medium
 
   * Team upload
diff -Nru libcoro-perl-6.514/debian/compat libcoro-perl-6.520/debian/compat
--- libcoro-perl-6.514/debian/compat	2016-11-20 07:20:09.000000000 +0000
+++ libcoro-perl-6.520/debian/compat	2018-08-18 11:08:21.000000000 +0000
@@ -1 +1 @@
-9
+10
diff -Nru libcoro-perl-6.514/debian/control libcoro-perl-6.520/debian/control
--- libcoro-perl-6.514/debian/control	2017-10-29 15:13:40.000000000 +0000
+++ libcoro-perl-6.520/debian/control	2018-08-18 11:08:21.000000000 +0000
@@ -5,7 +5,7 @@
 Section: perl
 Testsuite: autopkgtest-pkg-perl
 Priority: optional
-Build-Depends: debhelper (>= 9.20120312),
+Build-Depends: debhelper (>= 10),
                libanyevent-perl,
                libcanary-stability-perl,
                libcommon-sense-perl,
@@ -13,9 +13,9 @@
                libevent-perl,
                libguard-perl,
                perl
-Standards-Version: 4.1.1
-Vcs-Browser: https://anonscm.debian.org/cgit/pkg-perl/packages/libcoro-perl.git
-Vcs-Git: https://anonscm.debian.org/git/pkg-perl/packages/libcoro-perl.git
+Standards-Version: 4.2.0
+Vcs-Browser: https://salsa.debian.org/perl-team/modules/packages/libcoro-perl
+Vcs-Git: https://salsa.debian.org/perl-team/modules/packages/libcoro-perl.git
 Homepage: https://metacpan.org/release/Coro
 
 Package: libcoro-perl
@@ -30,6 +30,7 @@
             libevent-perl,
             libio-aio-perl,
             libnet-http-perl
+Multi-Arch: same
 Description: Perl framework implementing coroutines
  Coro is a collection of modules which manages continuations in general, most
  often in the form of cooperative threads (also called coros, or simply "coro"
diff -Nru libcoro-perl-6.514/debian/rules libcoro-perl-6.520/debian/rules
--- libcoro-perl-6.514/debian/rules	2017-06-21 18:44:11.000000000 +0000
+++ libcoro-perl-6.520/debian/rules	2018-08-18 11:08:21.000000000 +0000
@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 
-export DEB_BUILD_MAINT_OPTIONS = hardening=+bindnow
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 
 %:
 	dh $@
diff -Nru libcoro-perl-6.514/EV/EV.pm libcoro-perl-6.520/EV/EV.pm
--- libcoro-perl-6.514/EV/EV.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/EV/EV.pm	2018-08-14 16:50:39.000000000 +0000
@@ -60,7 +60,7 @@
 use XSLoader;
 
 BEGIN {
-   our $VERSION = 6.514;
+   our $VERSION = 6.52;
 
    local $^W = 0; # avoid redefine warning for Coro::ready;
    XSLoader::load __PACKAGE__, $VERSION;
diff -Nru libcoro-perl-6.514/Event/Event.pm libcoro-perl-6.520/Event/Event.pm
--- libcoro-perl-6.514/Event/Event.pm	2017-08-31 16:28:28.000000000 +0000
+++ libcoro-perl-6.520/Event/Event.pm	2018-08-14 16:50:39.000000000 +0000
@@ -92,7 +92,7 @@
 our @EXPORT = qw(loop unloop sweep);
 
 BEGIN {
-   our $VERSION = 6.514;
+   our $VERSION = 6.52;
 
    local $^W = 0; # avoid redefine warning for Coro::ready;
    XSLoader::load __PACKAGE__, $VERSION;
diff -Nru libcoro-perl-6.514/META.json libcoro-perl-6.520/META.json
--- libcoro-perl-6.514/META.json	2017-08-31 16:28:35.000000000 +0000
+++ libcoro-perl-6.520/META.json	2018-08-14 16:51:26.000000000 +0000
@@ -4,7 +4,7 @@
       "unknown"
    ],
    "dynamic_config" : 1,
-   "generated_by" : "ExtUtils::MakeMaker version 7.3, CPAN::Meta::Converter version 2.150010",
+   "generated_by" : "ExtUtils::MakeMaker version 7.32, CPAN::Meta::Converter version 2.150010",
    "license" : [
       "unknown"
    ],
@@ -51,6 +51,6 @@
       }
    },
    "release_status" : "stable",
-   "version" : 6.514,
+   "version" : 6.52,
    "x_serialization_backend" : "JSON::PP version 2.27300"
 }
diff -Nru libcoro-perl-6.514/META.yml libcoro-perl-6.520/META.yml
--- libcoro-perl-6.514/META.yml	2017-08-31 16:28:35.000000000 +0000
+++ libcoro-perl-6.520/META.yml	2018-08-14 16:51:25.000000000 +0000
@@ -8,7 +8,7 @@
   Canary::Stability: '0'
   ExtUtils::MakeMaker: '6.52'
 dynamic_config: 1
-generated_by: 'ExtUtils::MakeMaker version 7.3, CPAN::Meta::Converter version 2.150010'
+generated_by: 'ExtUtils::MakeMaker version 7.32, CPAN::Meta::Converter version 2.150010'
 license: unknown
 meta-spec:
   url: http://module-build.sourceforge.net/META-spec-v1.4.html
@@ -32,5 +32,5 @@
   Scalar::Util: '0'
   Storable: '2.15'
   common::sense: '0'
-version: 6.514
+version: 6.52
 x_serialization_backend: 'CPAN::Meta::YAML version 0.012'