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-rw-r--r--ext/wasm/api/sqlite3-opfs-async-proxy.js133
-rw-r--r--ext/wasm/api/sqlite3-vfs-opfs.c-pp.js22
2 files changed, 19 insertions, 136 deletions
diff --git a/ext/wasm/api/sqlite3-opfs-async-proxy.js b/ext/wasm/api/sqlite3-opfs-async-proxy.js
index a2c052d32..ca5583971 100644
--- a/ext/wasm/api/sqlite3-opfs-async-proxy.js
+++ b/ext/wasm/api/sqlite3-opfs-async-proxy.js
@@ -87,35 +87,6 @@ const installAsyncProxy = function(){
const log = (...args)=>logImpl(2, ...args);
const warn = (...args)=>logImpl(1, ...args);
const error = (...args)=>logImpl(0, ...args);
- const metrics = Object.create(null);
- metrics.reset = ()=>{
- let k;
- const r = (m)=>(m.count = m.time = m.wait = 0);
- for(k in state.opIds){
- r(metrics[k] = Object.create(null));
- }
- let s = metrics.s11n = Object.create(null);
- s = s.serialize = Object.create(null);
- s.count = s.time = 0;
- s = metrics.s11n.deserialize = Object.create(null);
- s.count = s.time = 0;
- };
- metrics.dump = ()=>{
- let k, n = 0, t = 0, w = 0;
- for(k in state.opIds){
- const m = metrics[k];
- n += m.count;
- t += m.time;
- w += m.wait;
- m.avgTime = (m.count && m.time) ? (m.time / m.count) : 0;
- }
- console.log(globalThis?.location?.href,
- "metrics for",globalThis?.location?.href,":\n",
- metrics,
- "\nTotal of",n,"op(s) for",t,"ms",
- "approx",w,"ms spent waiting on OPFS APIs.");
- console.log("Serialization metrics:",metrics.s11n);
- };
/**
__openFiles is a map of sqlite3_file pointers (integers) to
@@ -373,37 +344,6 @@ const installAsyncProxy = function(){
};
/**
- We track 2 different timers: the "metrics" timer records how much
- time we spend performing work. The "wait" timer records how much
- time we spend waiting on the underlying OPFS timer. See the calls
- to mTimeStart(), mTimeEnd(), wTimeStart(), and wTimeEnd()
- throughout this file to see how they're used.
- */
- const __mTimer = Object.create(null);
- __mTimer.op = undefined;
- __mTimer.start = undefined;
- const mTimeStart = (op)=>{
- __mTimer.start = performance.now();
- __mTimer.op = op;
- //metrics[op] || toss("Maintenance required: missing metrics for",op);
- ++metrics[op].count;
- };
- const mTimeEnd = ()=>(
- metrics[__mTimer.op].time += performance.now() - __mTimer.start
- );
- const __wTimer = Object.create(null);
- __wTimer.op = undefined;
- __wTimer.start = undefined;
- const wTimeStart = (op)=>{
- __wTimer.start = performance.now();
- __wTimer.op = op;
- //metrics[op] || toss("Maintenance required: missing metrics for",op);
- };
- const wTimeEnd = ()=>(
- metrics[__wTimer.op].wait += performance.now() - __wTimer.start
- );
-
- /**
Gets set to true by the 'opfs-async-shutdown' command to quit the
wait loop. This is only intended for debugging purposes: we cannot
inspect this file's state while the tight waitLoop() is running and
@@ -413,37 +353,24 @@ const installAsyncProxy = function(){
/**
Asynchronous wrappers for sqlite3_vfs and sqlite3_io_methods
- methods, as well as helpers like mkdir(). Maintenance reminder:
- members are in alphabetical order to simplify finding them.
+ methods, as well as helpers like mkdir().
*/
const vfsAsyncImpls = {
- 'opfs-async-metrics': async ()=>{
- mTimeStart('opfs-async-metrics');
- metrics.dump();
- storeAndNotify('opfs-async-metrics', 0);
- mTimeEnd();
- },
'opfs-async-shutdown': async ()=>{
flagAsyncShutdown = true;
storeAndNotify('opfs-async-shutdown', 0);
},
mkdir: async (dirname)=>{
- mTimeStart('mkdir');
let rc = 0;
- wTimeStart('mkdir');
try {
await getDirForFilename(dirname+"/filepart", true);
}catch(e){
state.s11n.storeException(2,e);
rc = state.sq3Codes.SQLITE_IOERR;
- }finally{
- wTimeEnd();
}
storeAndNotify('mkdir', rc);
- mTimeEnd();
},
xAccess: async (filename)=>{
- mTimeStart('xAccess');
/* OPFS cannot support the full range of xAccess() queries
sqlite3 calls for. We can essentially just tell if the file
is accessible, but if it is then it's automatically writable
@@ -456,26 +383,20 @@ const installAsyncProxy = function(){
accessible, non-0 means not accessible.
*/
let rc = 0;
- wTimeStart('xAccess');
try{
const [dh, fn] = await getDirForFilename(filename);
await dh.getFileHandle(fn);
}catch(e){
state.s11n.storeException(2,e);
rc = state.sq3Codes.SQLITE_IOERR;
- }finally{
- wTimeEnd();
}
storeAndNotify('xAccess', rc);
- mTimeEnd();
},
xClose: async function(fid/*sqlite3_file pointer*/){
const opName = 'xClose';
- mTimeStart(opName);
__implicitLocks.delete(fid);
const fh = __openFiles[fid];
let rc = 0;
- wTimeStart(opName);
if(fh){
delete __openFiles[fid];
await closeSyncHandle(fh);
@@ -487,15 +408,11 @@ const installAsyncProxy = function(){
state.s11n.serialize();
rc = state.sq3Codes.SQLITE_NOTFOUND;
}
- wTimeEnd();
storeAndNotify(opName, rc);
- mTimeEnd();
},
xDelete: async function(...args){
- mTimeStart('xDelete');
const rc = await vfsAsyncImpls.xDeleteNoWait(...args);
storeAndNotify('xDelete', rc);
- mTimeEnd();
},
xDeleteNoWait: async function(filename, syncDir = 0, recursive = false){
/* The syncDir flag is, for purposes of the VFS API's semantics,
@@ -511,7 +428,6 @@ const installAsyncProxy = function(){
is false.
*/
let rc = 0;
- wTimeStart('xDelete');
try {
while(filename){
const [hDir, filenamePart] = await getDirForFilename(filename, false);
@@ -527,14 +443,11 @@ const installAsyncProxy = function(){
state.s11n.storeException(2,e);
rc = state.sq3Codes.SQLITE_IOERR_DELETE;
}
- wTimeEnd();
return rc;
},
xFileSize: async function(fid/*sqlite3_file pointer*/){
- mTimeStart('xFileSize');
const fh = __openFiles[fid];
let rc = 0;
- wTimeStart('xFileSize');
try{
const sz = await (await getSyncHandle(fh,'xFileSize')).getSize();
state.s11n.serialize(Number(sz));
@@ -543,19 +456,15 @@ const installAsyncProxy = function(){
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR);
}
await releaseImplicitLock(fh);
- wTimeEnd();
storeAndNotify('xFileSize', rc);
- mTimeEnd();
},
xLock: async function(fid/*sqlite3_file pointer*/,
lockType/*SQLITE_LOCK_...*/){
- mTimeStart('xLock');
const fh = __openFiles[fid];
let rc = 0;
const oldLockType = fh.xLock;
fh.xLock = lockType;
if( !fh.syncHandle ){
- wTimeStart('xLock');
try {
await getSyncHandle(fh,'xLock');
__implicitLocks.delete(fid);
@@ -564,18 +473,14 @@ const installAsyncProxy = function(){
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_LOCK);
fh.xLock = oldLockType;
}
- wTimeEnd();
}
storeAndNotify('xLock',rc);
- mTimeEnd();
},
xOpen: async function(fid/*sqlite3_file pointer*/, filename,
flags/*SQLITE_OPEN_...*/,
opfsFlags/*OPFS_...*/){
const opName = 'xOpen';
- mTimeStart(opName);
const create = (state.sq3Codes.SQLITE_OPEN_CREATE & flags);
- wTimeStart('xOpen');
try{
let hDir, filenamePart;
try {
@@ -583,8 +488,6 @@ const installAsyncProxy = function(){
}catch(e){
state.s11n.storeException(1,e);
storeAndNotify(opName, state.sq3Codes.SQLITE_NOTFOUND);
- mTimeEnd();
- wTimeEnd();
return;
}
if( state.opfsFlags.OPFS_UNLINK_BEFORE_OPEN & opfsFlags ){
@@ -596,7 +499,6 @@ const installAsyncProxy = function(){
}
}
const hFile = await hDir.getFileHandle(filenamePart, {create});
- wTimeEnd();
const fh = Object.assign(Object.create(null),{
fid: fid,
filenameAbs: filename,
@@ -614,60 +516,47 @@ const installAsyncProxy = function(){
__openFiles[fid] = fh;
storeAndNotify(opName, 0);
}catch(e){
- wTimeEnd();
error(opName,e);
state.s11n.storeException(1,e);
storeAndNotify(opName, state.sq3Codes.SQLITE_IOERR);
}
- mTimeEnd();
},
xRead: async function(fid/*sqlite3_file pointer*/,n,offset64){
- mTimeStart('xRead');
let rc = 0, nRead;
const fh = __openFiles[fid];
try{
- wTimeStart('xRead');
nRead = (await getSyncHandle(fh,'xRead')).read(
fh.sabView.subarray(0, n),
{at: Number(offset64)}
);
- wTimeEnd();
if(nRead < n){/* Zero-fill remaining bytes */
fh.sabView.fill(0, nRead, n);
rc = state.sq3Codes.SQLITE_IOERR_SHORT_READ;
}
}catch(e){
- if(undefined===nRead) wTimeEnd();
error("xRead() failed",e,fh);
state.s11n.storeException(1,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_READ);
}
await releaseImplicitLock(fh);
storeAndNotify('xRead',rc);
- mTimeEnd();
},
xSync: async function(fid/*sqlite3_file pointer*/,flags/*ignored*/){
- mTimeStart('xSync');
const fh = __openFiles[fid];
let rc = 0;
if(!fh.readOnly && fh.syncHandle){
try {
- wTimeStart('xSync');
await fh.syncHandle.flush();
}catch(e){
state.s11n.storeException(2,e);
rc = state.sq3Codes.SQLITE_IOERR_FSYNC;
}
- wTimeEnd();
}
storeAndNotify('xSync',rc);
- mTimeEnd();
},
xTruncate: async function(fid/*sqlite3_file pointer*/,size){
- mTimeStart('xTruncate');
let rc = 0;
const fh = __openFiles[fid];
- wTimeStart('xTruncate');
try{
affirmNotRO('xTruncate', fh);
await (await getSyncHandle(fh,'xTruncate')).truncate(size);
@@ -677,35 +566,27 @@ const installAsyncProxy = function(){
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_TRUNCATE);
}
await releaseImplicitLock(fh);
- wTimeEnd();
storeAndNotify('xTruncate',rc);
- mTimeEnd();
},
xUnlock: async function(fid/*sqlite3_file pointer*/,
lockType/*SQLITE_LOCK_...*/){
- mTimeStart('xUnlock');
let rc = 0;
const fh = __openFiles[fid];
if( fh.syncHandle
&& state.sq3Codes.SQLITE_LOCK_NONE===lockType
/* Note that we do not differentiate between lock types in
this VFS. We're either locked or unlocked. */ ){
- wTimeStart('xUnlock');
try { await closeSyncHandle(fh) }
catch(e){
state.s11n.storeException(1,e);
rc = state.sq3Codes.SQLITE_IOERR_UNLOCK;
}
- wTimeEnd();
}
storeAndNotify('xUnlock',rc);
- mTimeEnd();
},
xWrite: async function(fid/*sqlite3_file pointer*/,n,offset64){
- mTimeStart('xWrite');
let rc;
const fh = __openFiles[fid];
- wTimeStart('xWrite');
try{
affirmNotRO('xWrite', fh);
rc = (
@@ -719,9 +600,7 @@ const installAsyncProxy = function(){
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_WRITE);
}
await releaseImplicitLock(fh);
- wTimeEnd();
storeAndNotify('xWrite',rc);
- mTimeEnd();
}
}/*vfsAsyncImpls*/;
@@ -755,8 +634,6 @@ const installAsyncProxy = function(){
}
};
state.s11n.deserialize = function(clear=false){
- ++metrics.s11n.deserialize.count;
- const t = performance.now();
const argc = viewU8[0];
const rc = argc ? [] : null;
if(argc){
@@ -781,12 +658,9 @@ const installAsyncProxy = function(){
}
if(clear) viewU8[0] = 0;
//log("deserialize:",argc, rc);
- metrics.s11n.deserialize.time += performance.now() - t;
return rc;
};
state.s11n.serialize = function(...args){
- const t = performance.now();
- ++metrics.s11n.serialize.count;
if(args.length){
//log("serialize():",args);
const typeIds = [];
@@ -817,7 +691,6 @@ const installAsyncProxy = function(){
}else{
viewU8[0] = 0;
}
- metrics.s11n.serialize.time += performance.now() - t;
};
state.s11n.storeException = state.asyncS11nExceptions
@@ -899,7 +772,6 @@ const installAsyncProxy = function(){
}
});
initS11n();
- metrics.reset();
log("init state",state);
wPost('opfs-async-inited');
waitLoop();
@@ -912,9 +784,6 @@ const installAsyncProxy = function(){
waitLoop();
}
break;
- case 'opfs-async-metrics':
- metrics.dump();
- break;
}
};
wPost('opfs-async-loaded');
diff --git a/ext/wasm/api/sqlite3-vfs-opfs.c-pp.js b/ext/wasm/api/sqlite3-vfs-opfs.c-pp.js
index fc0fb9db9..59a07aac7 100644
--- a/ext/wasm/api/sqlite3-vfs-opfs.c-pp.js
+++ b/ext/wasm/api/sqlite3-vfs-opfs.c-pp.js
@@ -443,7 +443,7 @@ const installOpfsVfs = function callee(options){
OPFS_UNLINK_BEFORE_OPEN: 0x02,
/**
If true, any async routine which implicitly acquires a sync
- access handle (i.e. an OPFS lock) will release that locks at
+ access handle (i.e. an OPFS lock) will release that lock at
the end of the call which acquires it. If false, such
"autolocks" are not released until the VFS is idle for some
brief amount of time.
@@ -470,9 +470,23 @@ const installOpfsVfs = function callee(options){
Atomics.notify(state.sabOPView, state.opIds.whichOp)
/* async thread will take over here */;
const t = performance.now();
- Atomics.wait(state.sabOPView, state.opIds.rc, -1)
- /* When this wait() call returns, the async half will have
- completed the operation and reported its results. */;
+ while('not-equal'!==Atomics.wait(state.sabOPView, state.opIds.rc, -1)){
+ /*
+ The reason for this loop is burried in the details of
+ a long discussion at:
+
+ https://github.com/sqlite/sqlite-wasm/issues/12
+
+ Summary: in at least one browser flavor, under high loads,
+ this wait() call can, on rare occasion, end up returning
+ 'ok', which indicates that it's returning _without_ the
+ other half of the proxy having called Atomics.notify(). When
+ this happens, we just wait() again.
+ */
+ }
+ /* When the above wait() call returns 'not-equal', the async
+ half will have completed the operation and reported its results
+ in the state.opIds.rc slot of the SAB. */
const rc = Atomics.load(state.sabOPView, state.opIds.rc);
metrics[op].wait += performance.now() - t;
if(rc && state.asyncS11nExceptions){
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-19 13:37:19 +0000