third_party/sqlite/patches/0003-Use-seperate-page-cache-pools-for-each-sqlite-connec.patch

From 3a6d9302ff14aec82291c7e2212ce37b7453ce9f Mon Sep 17 00:00:00 2001
From: rmcilroy <rmcilroy@chromium.org>
Date: Thu, 20 Jun 2013 22:50:12 +0000
Subject: [PATCH 03/16] Use seperate page-cache pools for each sqlite
 connection.

Due to multiple different subsystems using sqlite, the shared global page
cache policy does not suite our use-cases on Chrome very well.  This CL
enables a compile time flag to be set to disable shared cache pools.

BUG=243769

Original review URL: https://chromiumcodereview.appspot.com/17413004
---
 third_party/sqlite/src/src/pcache1.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/third_party/sqlite/src/src/pcache1.c b/third_party/sqlite/src/src/pcache1.c
index a8c3217..3fcee4b 100644
--- a/third_party/sqlite/src/src/pcache1.c
+++ b/third_party/sqlite/src/src/pcache1.c
@@ -567,6 +567,8 @@ static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){
   ** PGroup.  In other words, separateCache is true for mode (1) where no
   ** mutexing is required.
   **
+  **   *  Always use separate caches (mode-1) if SQLITE_SEPARATE_CACHE_POOLS
+  **
   **   *  Always use a unified cache (mode-2) if ENABLE_MEMORY_MANAGEMENT
   **
   **   *  Always use a unified cache in single-threaded applications
@@ -574,7 +576,9 @@ static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){
   **   *  Otherwise (if multi-threaded and ENABLE_MEMORY_MANAGEMENT is off)
   **      use separate caches (mode-1)
   */
-#if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
+#ifdef SQLITE_SEPARATE_CACHE_POOLS
+  const int separateCache = 1;
+#elif defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
   const int separateCache = 0;
 #else
   int separateCache = sqlite3GlobalConfig.bCoreMutex>0;
-- 
2.2.1