Experimentally add --nomutex flag to speedtest1 to have it open db with the SQLITE_OPEN_NOMUTEX flag.

FossilOrigin-Name: 45ef576b2ee6369ab1e3aa2ad284764bb334f92a69a33d88b7292bbc0a1b1fda

manifest

@@ -1,5 +1,5 @@
-C Add\sspeedtest1-worker.html,\san\sinteractive\sWorker-thread\svariant\sof\sspeedtest1.html.\sAdd\sext/wasm/index.html\sto\sact\sas\sa\sgateway\sto\sthe\svarious\stest\spages.
-D 2022-09-08T15:30:59.731
+C Experimentally\sadd\s--nomutex\sflag\sto\sspeedtest1\sto\shave\sit\sopen\sdb\swith\sthe\sSQLITE_OPEN_NOMUTEX\sflag.
+D 2022-09-08T19:53:59.576
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -1499,7 +1499,7 @@ F test/speed3.test 694affeb9100526007436334cf7d08f3d74b85ef
 F test/speed4.test abc0ad3399dcf9703abed2fff8705e4f8e416715
 F test/speed4p.explain 6b5f104ebeb34a038b2f714150f51d01143e59aa
 F test/speed4p.test 377a0c48e5a92e0b11c1c5ebb1bc9d83a7312c922bc0cb05970ef5d6a96d1f0c
-F test/speedtest1.c 55ef13e008cbb7dbea032478e60686599679b0b6192e44845c100fdabd14f8ff
+F test/speedtest1.c 345566965466923762c1d7f29295d766a05c87bf48115b3030ceec7592cd1cca
 F test/spellfix.test 951a6405d49d1a23d6b78027d3877b4a33eeb8221dcab5704b499755bb4f552e
 F test/spellfix2.test dfc8f519a3fc204cb2dfa8b4f29821ae90f6f8c3
 F test/spellfix3.test 0f9efaaa502a0e0a09848028518a6fb096c8ad33
@@ -2019,8 +2019,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 5ea0623630d769a8f3f07a40cd119be86b631192cdb5178131876b01b40ee5e0
-R b5dc0101db445e11af3bccae9adaef48
+P f16c68ee6d5ebb8dec2ab656dbab2ddb5f1d5133153ad553f986b31020adaa38
+R 7f356b1a33873f45424fcff13841218e
 U stephan
-Z 2c78924308cfac29c905a5ead30d4718
+Z 0d8d2c17b5d2ef83d66b0d6f4d0cb65c
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-f16c68ee6d5ebb8dec2ab656dbab2ddb5f1d5133153ad553f986b31020adaa38
+45ef576b2ee6369ab1e3aa2ad284764bb334f92a69a33d88b7292bbc0a1b1fda

test/speedtest1.c

@@ -20,6 +20,7 @@ static const char zHelp[] =
   "  --mmap SZ           MMAP the first SZ bytes of the database file\n"
   "  --multithread       Set multithreaded mode\n"
   "  --nomemstat         Disable memory statistics\n"
+  "  --nomutex           Open db with SQLITE_OPEN_NOMUTEX\n"
   "  --nosync            Set PRAGMA synchronous=OFF\n"
   "  --notnull           Add NOT NULL constraints to table columns\n"
   "  --output FILE       Store SQL output in FILE\n"
@@ -2192,6 +2193,8 @@ int main(int argc, char **argv){
   int nThread = 0;              /* --threads value */
   int mmapSize = 0;             /* How big of a memory map to use */
   int memDb = 0;                /* --memdb.  Use an in-memory database */
+  int openFlags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE
+    ;                           /* SQLITE_OPEN_xxx flags. */
   char *zTSet = "main";         /* Which --testset torun */
   int doTrace = 0;              /* True for --trace */
   const char *zEncoding = 0;    /* --utf16be or --utf16le */
@@ -2272,6 +2275,8 @@ int main(int argc, char **argv){
         if( i>=argc-1 ) fatal_error("missing argument on %s\n", argv[i]);
         mmapSize = integerValue(argv[++i]);
  #endif
+      }else if( strcmp(z,"nomutex")==0 ){
+        openFlags |= SQLITE_OPEN_NOMUTEX;
       }else if( strcmp(z,"nosync")==0 ){
         noSync = 1;
       }else if( strcmp(z,"notnull")==0 ){
@@ -2413,7 +2418,8 @@ int main(int argc, char **argv){
   sqlite3_initialize();
 
   /* Open the database and the input file */
-  if( sqlite3_open(memDb ? ":memory:" : zDbName, &g.db) ){
+  if( sqlite3_open_v2(memDb ? ":memory:" : zDbName, &g.db,
+                      openFlags, 0) ){
     fatal_error("Cannot open database file: %s\n", zDbName);
   }
 #if SQLITE_VERSION_NUMBER>=3006001