From 2ef04bad714981349b54fea4af9a629bc0a20c18 Mon Sep 17 00:00:00 2001
From: Glauber Costa <glommer@cloudius-systems.com>
Date: Mon, 12 May 2014 16:06:36 +0400
Subject: [PATCH] shrinker: export to C
Export the shrinker interface to C users.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Reviewed-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
---
core/mempool.cc | 7 +++++++
include/osv/shrinker.h | 28 ++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
create mode 100644 include/osv/shrinker.h
diff --git a/core/mempool.cc b/core/mempool.cc
index 919a9a67c..04a1adb09 100644
--- a/core/mempool.cc
+++ b/core/mempool.cc
@@ -28,6 +28,7 @@
#include <algorithm>
#include <osv/prio.hh>
#include <stdlib.h>
+#include <osv/shrinker.h>
#include "java/jvm_balloon.hh"
TRACEPOINT(trace_memory_malloc, "buf=%p, len=%d", void *, size_t);
@@ -629,6 +630,12 @@ shrinker::shrinker(std::string name)
}
}
+void *osv_register_shrinker(const char *name,
+ size_t (*func)(size_t target, bool hard))
+{
+ return reinterpret_cast<void *>(new c_shrinker(name, func));
+}
+
bool reclaimer_waiters::wake_waiters()
{
bool woken = false;
diff --git a/include/osv/shrinker.h b/include/osv/shrinker.h
new file mode 100644
index 000000000..bac7d242b
--- /dev/null
+++ b/include/osv/shrinker.h
@@ -0,0 +1,28 @@
+#ifndef SHRINKER_H_
+#define SHRINKER_H_
+
+#ifdef __cplusplus
+
+#include <osv/mempool.hh>
+
+class c_shrinker : public memory::shrinker {
+public:
+ explicit c_shrinker(const char *name,
+ size_t (*func)(size_t target, bool hard)) :
+ memory::shrinker(name), _func(func) {}
+ size_t request_memory(size_t s, bool hard) { return _func(s, hard); }
+private:
+ size_t (*_func)(size_t target, bool hard);
+};
+
+
+extern "C"
+void *osv_register_shrinker(const char *name,
+ size_t (*func)(size_t target, bool hard));
+#else
+#include <stdbool.h>
+void *osv_register_shrinker(const char *name,
+ size_t (*func)(size_t target, bool hard));
+#endif
+
+#endif
--
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