Add some debugging output to opfs and track down the breakage to the initial WebLock request, which is never reaching its callback. Still broken, but this is progress.

FossilOrigin-Name: 62fc8b35aeec75f5648b3daa24162c638999d447aa874bdfcbac1431c5c97b6f

ext/wasm/api/sqlite3-opfs-async-proxy.c-pp.js

@@ -620,11 +620,12 @@ const installAsyncProxy = function(){
     const view = state.sabOPView;
     const slock = state.lock;
     const lockType = Atomics.load(view, slock.type);
-
-    await navigator.locks.request('sqlite3-vfs-opfs:'+args[0], {
+    warn("handleLockRequest()", args, lockType);
+    navigator.locks.request('sqlite3-vfs-opfs:'+args[0], {
       mode: (lockType===state.sq3Codes.SQLITE_LOCK_EXCLUSIVE)
         ? 'exclusive' : 'shared'
     }, async (wl)=>{
+      warn("handleLockRequest() starting lock", args, lockType);
       /**
          A. Tell the C-side we have the browser lock. We use the same
          handshake slot, but a specific 'Granted' value.
@@ -642,6 +643,7 @@ const installAsyncProxy = function(){
       Atomics.store(view, slock.atomicsHandshake, 0);
       Atomics.notify(view, lock.atomicsHandshake);
     });
+    warn("handleLockRequest() ending", args, lockType);
   };
 
   const waitLoop = async function f(){
@@ -679,6 +681,7 @@ const installAsyncProxy = function(){
           continue;
         }
         const opId = Atomics.exchange(state.sabOPView, opIds.whichOp, 0);
+        warn("opId =",opId, opIds);
         if( opId===opIds.lockControl ){
           handleLockRequest();
           continue;

ext/wasm/api/sqlite3-vfs-opfs-wl.c-pp.js

@@ -60,13 +60,14 @@ const installOpfsWlVfs = async function callee(options){
   options = opfsUtil.initOptions(options, callee);
   if( !options ) return sqlite3;
   const capi = sqlite3.capi,
-        debug = sqlite3.config.debug,
+        debug = (...args)=>sqlite3.config.warn("opfs-wl:",...args),
         state = opfsUtil.createVfsState('opfs-wl', options),
         opfsVfs = state.vfs,
         metrics = opfsVfs.metrics.counters,
         mTimeStart = opfsVfs.mTimeStart,
         mTimeEnd = opfsVfs.mTimeEnd,
         __openFiles = opfsVfs.__openFiles;
+  debug("state",JSON.stringify(state,false,'  '));
   /* At this point, createVfsState() has populated state and opfsVfs
      with any code common to both the "opfs" and "opfs-wl" VFSes. Now
      comes the VFS-dependent work... */
@@ -75,6 +76,7 @@ const installOpfsWlVfs = async function callee(options){
       mTimeStart('xLock');
       ++metrics.xLock.count;
       const f = __openFiles[pFile];
+      debug("xLock()",f,lockType);
       let rc = 0;
       /* See notes in sqlite3-vfs-opfs.c-pp.js. */
       if( f.lockType ) {
@@ -89,10 +91,13 @@ const installOpfsWlVfs = async function callee(options){
           Atomics.store(view, state.lock.type, lockType);
           Atomics.store(view, state.opIds.whichOp, state.opIds.lockControl);
           Atomics.notify(state.sabOPView, state.opIds.whichOp)
+          debug("xLock waiting...");
           while('not-equal'!==Atomics.wait(view, state.lock.atomicsHandshake, 0)){
             /* Loop is a workaround for environment-specific quirks. See
                notes in similar loops. */
+            debug("xLock still waiting...");
           }
+          debug("xLock done waiting");
           f.lockType = lockType;
         }catch(e){
           sqlite3.config.error("xLock(",arguments,") failed", e, f);
@@ -103,6 +108,7 @@ const installOpfsWlVfs = async function callee(options){
       return rc;
     },
     xUnlock: function(pFile,lockType){
+      debug("xUnlock()",f,lockType);
       mTimeStart('xUnlock');
       ++metrics.xUnlock.count;
       const f = __openFiles[pFile];

ext/wasm/tests/opfs/concurrency/test.js

@@ -120,15 +120,15 @@
   const optArgs = function(obj){
     const li = [];
     for(const k of [
-      'interval','iterations','unlock-asap',
-      'verbose','vfs','workers',
+      'interval', 'iterations', 'unlock-asap',
+      'verbose', 'vfs', 'workers'
     ]){
       if( obj.hasOwnProperty(k) ) li.push(k+'='+obj[k]);
     }
     return li.join('&');
   };
   for(const opt of [
-    {interval: 500, workers: 3, iterations: 30, vfs: 'opfs-wl'},
+    {interval: 500, workers: 2, iterations: 30, vfs: 'opfs-wl', verbose: 2},
     {interval: 1000, workers: 5, iterations: 30},
     {interval: 500, workers: 5, iterations: 30},
     {interval: 250, workers: 3, iterations: 30},
@@ -154,7 +154,7 @@
       + '&opfs-unlock-asap='+options.unlockAsap
   );
   for(let i = 0; i < options.workerCount; ++i){
-    stdout("Launching worker...");
+    stdout("Launching worker...", i, );
     workers.push(new Worker(
       workers.uri+'&workerId='+(i+1)+(
         (i || options.noUnlink) ? '' : '&unlink-db'

ext/wasm/tests/opfs/concurrency/worker.js

@@ -36,8 +36,7 @@ globalThis.sqlite3InitModule().then(async function(sqlite3){
     count: 0
   });
   const finish = ()=>{
-    if(db){
-      if(!db.pointer) return;
+    if(db?.pointer){
       db.close();
     }
     if(interval.error){
@@ -71,7 +70,7 @@ globalThis.sqlite3InitModule().then(async function(sqlite3){
 
     const maxIterations =
           urlArgs.has('iterations') ? (+urlArgs.get('iterations') || 10) : 10;
-    stdout("Starting interval-based db updates with delay of",interval.delay,"ms.");
+    stdout("Starting",maxIterations,"interval-based db updates with delay of",interval.delay,"ms.");
     const doWork = async ()=>{
       const tm = new Date().getTime();
       ++interval.count;
@@ -86,39 +85,32 @@ globalThis.sqlite3InitModule().then(async function(sqlite3){
       }catch(e){
         interval.error = e;
       }
+      stdout("doWork()",prefix,"error ",interval.error);
     };
-    if(1){/*use setInterval()*/
-      setTimeout(async function timer(){
-        await doWork();
-        if(interval.error || maxIterations === interval.count){
-          finish();
-        }else{
-          setTimeout(timer, interval.delay);
-        }
-      }, interval.delay);
-    }else{
-      /*This approach provides no concurrency whatsoever: each worker
-        is run to completion before any others can work.*/
-      let i;
-      for(i = 0; i < maxIterations; ++i){
-        await doWork();
-        if(interval.error) break;
-        await wait(interval.ms);
+    setTimeout(async function timer(){
+      await doWork();
+      if(interval.error || maxIterations === interval.count){
+        finish();
+      }else{
+        setTimeout(timer, interval.delay);
       }
-      finish();
-    }
+    }, interval.delay);
   }/*run()*/;
 
   globalThis.onmessage = function({data}){
     switch(data.type){
-        case 'run': run().catch((e)=>{
+      case 'run':
+        run().catch((e)=>{
           if(!interval.error) interval.error = e;
+        }).catch(e=>{
+          /* Don't do this in finally() - it fires too soon. */
           finish();
+          throw e;
         });
-          break;
-        default:
-          stderr("Unhandled message type '"+data.type+"'.");
-          break;
+        break;
+      default:
+        stderr("Unhandled message type '"+data.type+"'.");
+        break;
     }
   };
 });

manifest

@@ -1,5 +1,5 @@
-C Get\sopfs-wl\splugged\sin\sto\sthe\sconcurrency\stester.\sSomewhat\sironically,\sall\scompeting\sworkers\sfail\swith\slocking\serrors\swhile\sworker\s1\sis\sbusy\srunning\soff\sthe\srails\ssomewhere.\sStashing\sfor\scloser\sinvestigation\slater.
-D 2026-03-04T20:33:21.840
+C Add\ssome\sdebugging\soutput\sto\sopfs\sand\strack\sdown\sthe\sbreakage\sto\sthe\sinitial\sWebLock\srequest,\swhich\sis\snever\sreaching\sits\scallback.\sStill\sbroken,\sbut\sthis\sis\sprogress.
+D 2026-03-04T21:16:36.068
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -594,11 +594,11 @@ F ext/wasm/api/sqlite3-api-oo1.c-pp.js 45454631265d9ce82685f1a64e1650ee19c8e121c
 F ext/wasm/api/sqlite3-api-prologue.js 98fedc159c9239b226d19567d7172300dee5ffce176e5fa2f62dd1f17d088385
 F ext/wasm/api/sqlite3-api-worker1.c-pp.js 1041dd645e8e821c082b628cd8d9acf70c667430f9d45167569633ffc7567938
 F ext/wasm/api/sqlite3-license-version-header.js 98d90255a12d02214db634e041c8e7f2f133d9361a8ebf000ba9c9af4c6761cc
-F ext/wasm/api/sqlite3-opfs-async-proxy.c-pp.js f0a2aa8712211ff9db2ef548ae8b676be3e7c82f61586d03fd8317fbc95bbedd
+F ext/wasm/api/sqlite3-opfs-async-proxy.c-pp.js 792a18708a6207d9bf274b04dcddd06fd805e93d1b7f716230df3c745f2800ee
 F ext/wasm/api/sqlite3-vfs-helper.c-pp.js 3f828cc66758acb40e9c5b4dcfd87fd478a14c8fb7f0630264e6c7fa0e57515d
 F ext/wasm/api/sqlite3-vfs-kvvfs.c-pp.js a61dd2b4d919d2d5d83c5c7e49b89ecbff2525ff81419f6a6dbaecaf3819c490
 F ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js 1575ea6bbcf2da1e6df6892c17521a0c1c1c199a672e9090176ea0b88de48bd9
-F ext/wasm/api/sqlite3-vfs-opfs-wl.c-pp.js 62d41024ad20c388c022f032d3f25838809cb00915ebeb97b598b9f370fba2c3
+F ext/wasm/api/sqlite3-vfs-opfs-wl.c-pp.js 1e6e087a89e9cd202d457c84dae29fa4808612ff9f37210c383eb6bbab3dfd34
 F ext/wasm/api/sqlite3-vfs-opfs.c-pp.js 50a955ef393722d498177ad09c9e2d05bbe8dccae4c40c501482a860ca30017d
 F ext/wasm/api/sqlite3-vtab-helper.c-pp.js 366596d8ff73d4cefb938bbe95bc839d503c3fab6c8335ce4bf52f0d8a7dee81
 F ext/wasm/api/sqlite3-wasm.c 45bb20e19b245136711f9b78584371233975811b6560c29ed9b650e225417e29
@@ -646,8 +646,8 @@ F ext/wasm/tester1-worker.c-pp.html d0032241d0b24d996cf1c4dd0dde364189693af9b5c9
 F ext/wasm/tester1.c-pp.html 52d88fe2c6f21a046030a36410b4839b632f4424028197a45a3d5669ea724ddb
 F ext/wasm/tester1.c-pp.js 6b946cd6d4da130dbae4a401057716d27117ca02cad2ea8c29ae9c46c675d618
 F ext/wasm/tests/opfs/concurrency/index.html 657578a6e9ce1e9b8be951549ed93a6a471f4520a99e5b545928668f4285fb5e
-F ext/wasm/tests/opfs/concurrency/test.js 2150850176a1ffbe7f6b19f5cf5db9c77290764d6d54430b2796b6512b676a4a
-F ext/wasm/tests/opfs/concurrency/worker.js 537e11f86fdc5d5bc64032aaa48cd027a2f8cf4b020aca6c3c012fec85da2eb1
+F ext/wasm/tests/opfs/concurrency/test.js b80e17488a8e4d5500deaf68f73a7298d7d351f74bb952691a4e7b6c02a5643b
+F ext/wasm/tests/opfs/concurrency/worker.js de0be3be41da20e6639cdea10467fb5d9cdf540e711b403728a08d99bbb82ee6
 F ext/wasm/tests/opfs/sahpool/digest-worker.js b0ab6218588f1f0a6d15a363b493ceaf29bfb87804d9e0165915a9996377cf79
 F ext/wasm/tests/opfs/sahpool/digest.html 206d08a34dc8bd570b2581d3d9ab3ecad3201b516a598dd096dcf3cf8cd81df8
 F ext/wasm/tests/opfs/sahpool/index.html be736567fd92d3ecb9754c145755037cbbd2bca01385e2732294b53f4c842328
@@ -2191,8 +2191,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh d924598cf2f55a4ecbc2aeb055c10bd5f48114793e7ba25f9585435da29e7e98
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P 5978ee4902e4223fed6b95bd2d8f489bb300af8b762650e7113d1f3e97519d88
-R 0cf8357d9b35fb1b75ea83762f01c38b
+P 3b27310aa29ea84f459974981a600301abac5c705029a289d3872ecacf231da3
+R 5c13d459ac5b107e6cc5943524da9a40
 U stephan
-Z eba11c8254e99ee26ae9feba85ef81c4
+Z 9fafbc035e4ee3a2d442f9b59c8a5807
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-3b27310aa29ea84f459974981a600301abac5c705029a289d3872ecacf231da3
+62fc8b35aeec75f5648b3daa24162c638999d447aa874bdfcbac1431c5c97b6f