From: dan <dan@noemail.net>
Date: Wed, 11 May 2016 20:03:23 +0000 (+0000)
Subject: Remove a redundant condition from pcache.c. Add an OPTIMIZATION-IF-TRUE comment to... 
X-Git-Tag: version-3.13.0~15
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=401907e3ff7616e85469752102c52f4bdaf7d73c;p=thirdparty%2Fsqlite.git

Remove a redundant condition from pcache.c. Add an OPTIMIZATION-IF-TRUE comment to another condition that requires it.

FossilOrigin-Name: 3bfd2621d13b4f842f3af6d35519653f4eb8cad7
---

diff --git a/manifest b/manifest
index a51e55cb83..6c5a26e092 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Remove\ssome\sa\ssmall\samount\sof\sredundant\scode\srelated\sto\sPCache.pSynced\sfrom\spcache.c.
-D 2016-05-11T15:41:15.317
+C Remove\sa\sredundant\scondition\sfrom\spcache.c.\sAdd\san\sOPTIMIZATION-IF-TRUE\scomment\sto\sanother\scondition\sthat\srequires\sit.
+D 2016-05-11T20:03:23.145
 F Makefile.in 9eda6e1c90d05c199c3ec8a7069b0682ad307657
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc db82b35aef27f412fef14d8534afc022138bcdfd
@@ -367,7 +367,7 @@ F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
 F src/pager.c cb7a3990eabd895f6487c0856a7fec02b5e40faa
 F src/pager.h 329bdf078a4e0a3b35084534d58625d21fd03681
 F src/parse.y 10eb2f3fb62341291528c7984498054731f9d31e
-F src/pcache.c 4af980bc2a987cf81ddbe867d238c9ccdbaac95c
+F src/pcache.c 95ee5008eddda9c61b8d053de8eebf72cf5df7c6
 F src/pcache.h 6b865be765d1ebd06145219550b10921c7da7cc9
 F src/pcache1.c 7f51d2b541aab57596adf62db2c4bb025d34f04d
 F src/pragma.c faf42922bb7ab2f6672cb550356c1967abae3c84
@@ -1488,7 +1488,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 345ce1c9f64f2a424663b4dfcbe4586d9df7bff6
-R 410857f6cadf18a1818aed66391afc72
+P 9cc8cad78fdfe044ad6726ebfe6909c1e242fa55
+R bd613f88cc94ba593741d724ce8bf946
 U dan
-Z b239392669bc1d86adff0f06ee03f5ae
+Z ba94a14dc94ea0c9562dd2071f1152d6
diff --git a/manifest.uuid b/manifest.uuid
index 9b2b37fae9..034ae63216 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-9cc8cad78fdfe044ad6726ebfe6909c1e242fa55
\ No newline at end of file
+3bfd2621d13b4f842f3af6d35519653f4eb8cad7
\ No newline at end of file
diff --git a/src/pcache.c b/src/pcache.c
index 54b4044a01..4051bee00e 100644
--- a/src/pcache.c
+++ b/src/pcache.c
@@ -94,10 +94,15 @@ static void pcacheManageDirtyList(PgHdr *pPage, u8 addRemove){
     if( pPage->pDirtyPrev ){
       pPage->pDirtyPrev->pDirtyNext = pPage->pDirtyNext;
     }else{
+      /* If there are now no dirty pages in the cache, set eCreate to 2. 
+      ** This is an optimization that allows sqlite3PcacheFetch() to skip
+      ** searching for a dirty page to eject from the cache when it might
+      ** otherwise have to.  */
       assert( pPage==p->pDirty );
       p->pDirty = pPage->pDirtyNext;
-      if( p->pDirty==0 && p->bPurgeable ){
-        assert( p->eCreate==1 );
+      assert( p->bPurgeable || p->eCreate==2 );
+      if( p->pDirty==0 ){         /*OPTIMIZATION-IF-TRUE*/
+        assert( p->bPurgeable==0 || p->eCreate==1 );
         p->eCreate = 2;
       }
     }
@@ -266,6 +271,7 @@ sqlite3_pcache_page *sqlite3PcacheFetch(
   assert( pCache->pCache!=0 );
   assert( createFlag==3 || createFlag==0 );
   assert( pgno>0 );
+  assert( pCache->eCreate==((pCache->bPurgeable && pCache->pDirty) ? 1 : 2) );
 
   /* eCreate defines what to do if the page does not exist.
   **    0     Do not allocate a new page.  (createFlag==0)