4 files changed, 35 insertions, 2 deletions
diff --git a/deps/libeio/Changes b/deps/libeio/Changes
index d98deefdd0..d4c3a12a7a 100644
--- a/deps/libeio/Changes
+++ b/deps/libeio/Changes
@@ -3,6 +3,7 @@ Revision history for libeio
 TODO: maybe add mincore support? available on at leats darwin, solaris, linux, freebsd
 
 1.0
+	- added EIO_STACKSIZE.
 	- added msync, mtouch support (untested).
         - added sync_file_range (untested).
         - fixed custom support.
diff --git a/deps/libeio/eio.c b/deps/libeio/eio.c
index e0e172fbf4..b26008b140 100644
--- a/deps/libeio/eio.c
+++ b/deps/libeio/eio.c
@@ -38,6 +38,10 @@
  */
 
 #include "eio.h"
+
+#ifdef EIO_STACKSIZE
+# define XTHREAD_STACKSIZE EIO_STACKSIZE
+#endif
 #include "xthread.h"
 
 #include <errno.h>
diff --git a/deps/libeio/eio.pod b/deps/libeio/eio.pod
index bbacb662d3..d16b3a9a4f 100644
--- a/deps/libeio/eio.pod
+++ b/deps/libeio/eio.pod
@@ -245,6 +245,27 @@ If you need to know how, check the C<IO::AIO> perl module, which does
 exactly that.
 
 
+=head1 COMPILETIME CONFIGURATION
+
+These symbols, if used, must be defined when compiling F<eio.c>.
+
+=over 4
+
+=item EIO_STACKSIZE
+
+This symbol governs the stack size for each eio thread. Libeio itself
+was written to use very little stackspace, but when using C<EIO_CUSTOM>
+requests, you might want to increase this.
+
+If this symbol is undefined (the default) then libeio will use its default
+stack size (C<sizeof (long) * 4096> currently).  If it is defined, but
+C<0>, then the default operating system stack size will be used. In all
+other cases, the value must be an expression that evaluates to the desired
+stack size.
+
+=back
+
+
 =head1 PORTABILITY REQUIREMENTS
 
 In addition to a working ISO-C implementation, libeio relies on a few
diff --git a/deps/libeio/xthread.h b/deps/libeio/xthread.h
index 63ff20cbd4..88881e8a97 100644
--- a/deps/libeio/xthread.h
+++ b/deps/libeio/xthread.h
@@ -118,6 +118,10 @@ typedef pthread_t thread_t;
 # define PTHREAD_STACK_MIN 0
 #endif
 
+#ifndef XTHREAD_STACKSIZE
+# define XTHREAD_STACKSIZE sizeof (long) * 4096
+#endif
+
 static int
 thread_create (thread_t *tid, void *(*proc)(void *), void *arg)
 {
@@ -127,8 +131,11 @@ thread_create (thread_t *tid, void *(*proc)(void *), void *arg)
 
   pthread_attr_init (&attr);
   pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
-  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN < sizeof (long) * 4096 * 4
-                                    ? sizeof (long) * 4096 * 4 : PTHREAD_STACK_MIN);
+
+  if (XTHREAD_STACKSIZE > 0)
+    pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN > (XTHREAD_STACKSIZE)
+                                      ? PTHREAD_STACK_MIN : (XTHREAD_STACKSIZE));
+
 #ifdef PTHREAD_SCOPE_PROCESS
   pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
 #endif