SourceFormat Enforcement

[thirdparty/squid.git] / src / ipc / mem / PagePool.cc

diff --git a/src/ipc/mem/PagePool.cc b/src/ipc/mem/PagePool.cc
index 5fb2288b1743eece4b5e3a173469e36b556cf1d0..d5ef1bcd0583fdfaa70a4065e7d830831d66fa78 100644 (file)
--- a/src/ipc/mem/PagePool.cc
+++ b/src/ipc/mem/PagePool.cc
@@ -1,11 +1,73 @@
 /*
- * $Id$
- *
- * DEBUG: section 54    Interprocess Communication
+ * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
  *
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
  */
 
-#include "config.h"
+/* DEBUG: section 54    Interprocess Communication */
+
+#include "squid.h"
+#include "base/TextException.h"
+#include "ipc/mem/Page.h"
 #include "ipc/mem/PagePool.h"
 
-// TODO: implement
+// Ipc::Mem::PagePool
+
+Ipc::Mem::PagePool::Owner *
+Ipc::Mem::PagePool::Init(const char *const id, const unsigned int capacity, const size_t pageSize)
+{
+    static uint32_t LastPagePoolId = 0;
+    if (++LastPagePoolId == 0)
+        ++LastPagePoolId; // skip zero pool id
+    return shm_new(PageStack)(id, LastPagePoolId, capacity, pageSize);
+}
+
+Ipc::Mem::PagePool::PagePool(const char *const id):
+    pageIndex(shm_old(PageStack)(id)),
+    theLevels(reinterpret_cast<Levels_t *>(
+                  reinterpret_cast<char *>(pageIndex.getRaw()) +
+                  pageIndex->stackSize())),
+    theBuf(reinterpret_cast<char *>(theLevels + PageId::maxPurpose))
+{
+}
+
+size_t
+Ipc::Mem::PagePool::level(const int purpose) const
+{
+    Must(0 <= purpose && purpose < PageId::maxPurpose);
+    return theLevels[purpose];
+}
+
+bool
+Ipc::Mem::PagePool::get(const PageId::Purpose purpose, PageId &page)
+{
+    Must(0 <= purpose && purpose < PageId::maxPurpose);
+    if (pageIndex->pop(page)) {
+        page.purpose = purpose;
+        ++theLevels[purpose];
+        return true;
+    }
+    return false;
+}
+
+void
+Ipc::Mem::PagePool::put(PageId &page)
+{
+    if (!page)
+        return;
+
+    Must(0 <= page.purpose && page.purpose < PageId::maxPurpose);
+    --theLevels[page.purpose];
+    page.purpose = PageId::maxPurpose;
+    return pageIndex->push(page);
+}
+
+char *
+Ipc::Mem::PagePool::pagePointer(const PageId &page)
+{
+    Must(pageIndex->pageIdIsValid(page));
+    return theBuf + pageSize() * (page.number - 1);
+}
+