From 5456ef30926fa38b0d1705f9dcc6aa8def8a802d Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Thu, 10 May 2012 20:45:35 +0200
Subject: [PATCH] Use polling instead of boost's broken semaphore on OSX

---
 src/util.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/util.h b/src/util.h
index 61ff5535..f25a030f 100644
--- a/src/util.h
+++ b/src/util.h
@@ -292,7 +292,47 @@ typedef CMutexLock<CCriticalSection> CCriticalBlock;
         LeaveCritical(); \
     }
 
+#ifdef MAC_OSX
+// boost::interprocess::interprocess_semaphore seems to spinlock on OSX; prefer polling instead
+class CSemaphore
+{
+private:
+    CCriticalSection cs;
+    int val;
+
+public:
+    CSemaphore(int init) : val(init) {}
+
+    void wait() {
+        do {
+            {
+                LOCK(cs);
+                if (val>0) {
+                    val--;
+                    return;
+                }
+            }
+            Sleep(100);
+        } while(1);
+    }
+
+    bool try_wait() {
+        LOCK(cs);
+        if (val>0) {
+            val--;
+            return true;
+        }
+        return false;
+    }
+
+    void post() {
+        LOCK(cs);
+        val++;
+    }
+};
+#else
 typedef boost::interprocess::interprocess_semaphore CSemaphore;
+#endif
 
 /** RAII-style semaphore lock */
 class CSemaphoreGrant