From 18a3a48db1ff3f4fef94915e2021c5d0a790d24b Mon Sep 17 00:00:00 2001
From: drh <>
Date: Fri, 2 Sep 2022 00:36:16 +0000
Subject: Experimental changes to put sqlite3_temp_directory behind a mutex.

FossilOrigin-Name: 5ee3515fbb88bf1ae5f8b507844f82dcc429380b6ebeab9b09b52b25ee60a60d
---
 src/os_unix.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

(limited to 'src/os_unix.c')

diff --git a/src/os_unix.c b/src/os_unix.c
index f809eca9f..fd7a50dcd 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -5855,6 +5855,7 @@ static const char *unixTempFileDir(void){
 static int unixGetTempname(int nBuf, char *zBuf){
   const char *zDir;
   int iLimit = 0;
+  int rc = SQLITE_OK;
 
   /* It's odd to simulate an io-error here, but really this is just
   ** using the io-error infrastructure to test that SQLite handles this
@@ -5863,18 +5864,26 @@ static int unixGetTempname(int nBuf, char *zBuf){
   zBuf[0] = 0;
   SimulateIOError( return SQLITE_IOERR );
 
+  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_TEMPDIR));
   zDir = unixTempFileDir();
-  if( zDir==0 ) return SQLITE_IOERR_GETTEMPPATH;
-  do{
-    u64 r;
-    sqlite3_randomness(sizeof(r), &r);
-    assert( nBuf>2 );
-    zBuf[nBuf-2] = 0;
-    sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
-                     zDir, r, 0);
-    if( zBuf[nBuf-2]!=0 || (iLimit++)>10 ) return SQLITE_ERROR;
-  }while( osAccess(zBuf,0)==0 );
-  return SQLITE_OK;
+  if( zDir==0 ){
+    rc = SQLITE_IOERR_GETTEMPPATH;
+  }else{
+    do{
+      u64 r;
+      sqlite3_randomness(sizeof(r), &r);
+      assert( nBuf>2 );
+      zBuf[nBuf-2] = 0;
+      sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
+                       zDir, r, 0);
+      if( zBuf[nBuf-2]!=0 || (iLimit++)>10 ){
+        rc = SQLITE_ERROR;
+        break;
+      }
+    }while( osAccess(zBuf,0)==0 );
+  }
+  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_TEMPDIR));
+  return rc;
 }
 
 #if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
-- 
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