introduce EsWorkQueue

apps/file_manager/main.cpp

@@ -247,12 +247,6 @@ Array<String> bookmarks;
 Array<FolderViewSettingsEntry> folderViewSettings;
 HashStore<uint64_t, Thumbnail> thumbnailCache;
 
-// Non-blocking task thread.
-
-EsHandle nonBlockingTaskWorkAvailable;
-EsMutex nonBlockingTaskMutex;
-Array<Task *> nonBlockingTasks;
-
 // Styles.
 
 const EsStyle styleFolderView = {
@@ -346,41 +340,20 @@ void BlockingTaskQueue(Instance *instance, Task task) {
 	}
 }
 
-void NonBlockingTaskThread(EsGeneric) {
-	while (true) {
-		EsWait(&nonBlockingTaskWorkAvailable, 1, ES_WAIT_NO_TIMEOUT);
-
-		while (true) {
-			EsMutexAcquire(&nonBlockingTaskMutex);
-
-			if (!nonBlockingTasks.Length()) {
-				EsMutexRelease(&nonBlockingTaskMutex);
-				break;
-			}
-
-			Task *task = nonBlockingTasks[0];
-			nonBlockingTasks.Delete(0);
-			EsMutexRelease(&nonBlockingTaskMutex);
-
-			task->callback(nullptr, task);
-
-			EsMessage m = { MESSAGE_NON_BLOCKING_TASK_COMPLETE };
-			m.user.context2.p = task;
-			EsMessagePost(nullptr, &m);
-		}
-	}
+void NonBlockingTaskWrapper(EsGeneric _task) {
+	Task *task = (Task *) _task.p;
+	task->callback(nullptr, task);
+	EsMessage m = { MESSAGE_NON_BLOCKING_TASK_COMPLETE };
+	m.user.context2.p = task;
+	EsMessagePost(nullptr, &m);
 }
 
 void NonBlockingTaskQueue(Task _task) {
 	// NOTE We can't store instances in tasks on the non-blocking queue thread,
 	// because the instances might be destroyed while the task is in progress!
-
 	Task *task = (Task *) EsHeapAllocate(sizeof(Task), false);
 	EsMemoryCopy(task, &_task, sizeof(Task));
-	EsMutexAcquire(&nonBlockingTaskMutex);
-	nonBlockingTasks.Add(task);
-	EsMutexRelease(&nonBlockingTaskMutex);
-	EsEventSet(nonBlockingTaskWorkAvailable);
+	EsWorkQueue(NonBlockingTaskWrapper, task);
 }
 
 void NonBlockingTaskComplete(EsMessage *message) {
@@ -515,15 +488,6 @@ void _start() {
 		DriveAdd(prefix, prefixBytes);
 	}, 0);
 
-	// Start the non-blocking task threads.
-
-	nonBlockingTaskWorkAvailable = EsEventCreate(true /* autoReset */);
-	EsThreadInformation _nonBlockingTaskThread = {};
-
-	for (uintptr_t i = 0; i < EsSystemGetOptimalWorkQueueThreadCount(); i++) {
-		EsThreadCreate(NonBlockingTaskThread, &_nonBlockingTaskThread, nullptr);
-	}
-
 	// Process messages.
 
 	while (true) {
@@ -557,7 +521,6 @@ void _start() {
 			}
 
 			EsAssert(!instances.Length());
-			EsHandleClose(nonBlockingTaskWorkAvailable);
 			EsHeapFree(fileTypesBuffer.out);
 
 			bookmarks.Free();
@@ -568,7 +531,6 @@ void _start() {
 			knownFileTypes.Free();
 			knownFileTypesByExtension.Free();
 			loadedFolders.Free();
-			nonBlockingTasks.Free();
 			thumbnailCache.Free();
 #endif
 		} else if (message->type == ES_MSG_REGISTER_FILE_SYSTEM) {

desktop/api.cpp

@@ -94,7 +94,7 @@ struct ThreadLocalStorage {
 	// This must be the first field.
 	ThreadLocalStorage *self;
 
-	uint64_t id;
+	EsObjectID id;
 };
 
 struct MountPoint : EsMountPoint {
@@ -109,6 +109,11 @@ struct Timer {
 	EsGeneric argument;
 };
 
+struct Work {
+	EsWorkCallback callback;
+	EsGeneric context;
+};
+
 struct {
 	Array<EsSystemConfigurationGroup> systemConfigurationGroups;
 	EsMutex systemConfigurationMutex;
@@ -136,6 +141,10 @@ struct {
 	uintptr_t performanceTimerStackCount;
 
 	ThreadLocalStorage firstThreadLocalStorage;
+
+	EsHandle workAvailable;
+	EsMutex workMutex;
+	Array<Work> workQueue;
 } api;
 
 ptrdiff_t tlsStorageOffset;
@@ -866,6 +875,9 @@ EsMessage *EsMessageReceive() {
 				gui.allWindows.Free();
 				calculator.Free();
 				HashTableFree(&gui.keyboardShortcutNames, false);
+				EsHandleClose(api.workAvailable); // TODO Waiting for all work to finish.
+				EsAssert(!api.workQueue.Length());
+				api.workQueue.Free();
 				MemoryLeakDetectorCheckpoint(&heap);
 				EsPrint("ES_MSG_APPLICATION_EXIT - Heap allocation count: %d (%d from malloc).\n", heap.allocationsCount, mallocCount);
 #endif
@@ -1259,7 +1271,7 @@ uintptr_t EsSystemGetOptimalWorkQueueThreadCount() {
 
 void ThreadInitialise(ThreadLocalStorage *local) {
 	EsMemoryZero(local, sizeof(ThreadLocalStorage));
-	local->id = EsSyscall(ES_SYSCALL_THREAD_GET_ID, ES_CURRENT_THREAD, 0, 0, 0);
+	EsSyscall(ES_SYSCALL_THREAD_GET_ID, ES_CURRENT_THREAD, (uintptr_t) &local->id, 0, 0);
 	local->self = local;
 	EsSyscall(ES_SYSCALL_PROCESS_SET_TLS, (uintptr_t) local - tlsStorageOffset, 0, 0, 0);
 }
@@ -1881,6 +1893,44 @@ void EsTimerCancel(EsTimer id) {
 	EsMutexRelease(&api.timersMutex);
 }
 
+void WorkThread(EsGeneric) {
+	while (true) {
+		EsWait(&api.workAvailable, 1, ES_WAIT_NO_TIMEOUT);
+
+		while (true) {
+			EsMutexAcquire(&api.workMutex);
+
+			if (api.workQueue.Length()) {
+				Work work = api.workQueue[0];
+				api.workQueue.Delete(0);
+				EsMutexRelease(&api.workMutex);
+				work.callback(work.context);
+			} else {
+				EsMutexRelease(&api.workMutex);
+			}
+		}
+	}
+}
+
+void EsWorkQueue(EsWorkCallback callback, EsGeneric context) {
+	EsMutexAcquire(&api.workMutex);
+
+	if (!api.workAvailable) {
+		api.workAvailable = EsEventCreate(true /* autoReset */);
+		EsThreadInformation thread = {};
+
+		for (uintptr_t i = 0; i < EsSystemGetOptimalWorkQueueThreadCount(); i++) {
+			EsThreadCreate(WorkThread, &thread, nullptr);
+			EsHandleClose(thread.handle);
+		}
+	}
+
+	Work work = { callback, context };
+	api.workQueue.Add(work);
+	EsMutexRelease(&api.workMutex);
+	EsEventSet(api.workAvailable);
+}
+
 #ifndef ENABLE_POSIX_SUBSYSTEM
 void EsPOSIXInitialise(int *, char ***) {
 	while (true) {

desktop/os.header

@@ -1905,6 +1905,7 @@ function_pointer void EsListViewEnumerateVisibleItemsCallback(EsListView *view,
 function_pointer void EsFontEnumerationCallback(const EsFontInformation *information, EsGeneric context);
 function_pointer void EsUserTaskCallback(EsUserTask *task, EsGeneric data);
 function_pointer bool EsFileCopyCallback(EsFileOffset bytesCopied, EsFileOffset totalBytes, EsGeneric data); // Return false to cancel.
+function_pointer void EsWorkCallback(EsGeneric context);
 
 // System.
 
@@ -1985,16 +1986,19 @@ function EsError EsDeviceControl(EsHandle handle, EsDeviceControlType type, void
 
 function EsError EsProcessCreate(EsProcessCreationArguments *arguments, EsProcessInformation *information); 
 function int EsProcessGetExitStatus(EsHandle process); 
-function EsObjectID EsProcessGetID(EsHandle process); 
+function EsObjectID EsProcessGetID(EsHandle process);
 function void EsProcessGetState(EsHandle process, EsProcessState *state); 
 function EsHandle EsProcessOpen(EsObjectID pid); 
 function void EsProcessPause(EsHandle process, bool resume); 
 function void EsProcessTerminate(EsHandle process, int status); 
 function void EsProcessTerminateCurrent(); 
+
 function EsError EsThreadCreate(EsThreadEntryCallback entryFunction, EsThreadInformation *information, EsGeneric argument); 
-function EsObjectID EsThreadGetID(EsHandle thread); // TODO Make this 64-bit.
+function EsObjectID EsThreadGetID(EsHandle thread);
 function void EsThreadTerminate(EsHandle thread); 
 
+function void EsWorkQueue(EsWorkCallback callback, EsGeneric context);
+
 // Memory.
 
 function void *EsArenaAllocate(EsArena *arena, bool zero); // Not thread-safe.

desktop/posix.cpp

@@ -257,7 +257,9 @@ long EsPOSIXSystemCall(long n, long a1, long a2, long a3, long a4, long a5, long
 
 		case SYS_getpid: {
 			// Run the system call directly, so that the kernel can handle the vfork()'d case.
-			returnValue = EsSyscall(ES_SYSCALL_THREAD_GET_ID, ES_CURRENT_PROCESS, 0, 0, 0);
+			EsObjectID id;
+			EsSyscall(ES_SYSCALL_THREAD_GET_ID, ES_CURRENT_PROCESS, (uintptr_t) &id, 0, 0);
+			returnValue = id;
 		} break;
 
 		case SYS_gettid: {
@@ -484,7 +486,7 @@ long EsPOSIXSystemCall(long n, long a1, long a2, long a3, long a4, long a5, long
 
 		case SYS_prlimit64: {
 			// You can't access other process's resources.
-			if (a1 && a1 != (long) EsSyscall(ES_SYSCALL_THREAD_GET_ID, ES_CURRENT_PROCESS, 0, 0, 0)) {
+			if (a1 && a1 != (long) EsProcessGetID(ES_CURRENT_PROCESS)) {
 				returnValue = -EPERM;
 				break;
 			}

desktop/syscall.cpp

@@ -436,16 +436,20 @@ void EsProcessPause(EsHandle process, bool resume) {
 	EsSyscall(ES_SYSCALL_PROCESS_PAUSE, process, resume, 0, 0);
 }
 
-uint64_t EsThreadGetID(EsHandle thread) {
+EsObjectID EsThreadGetID(EsHandle thread) {
 	if (thread == ES_CURRENT_THREAD) {
 		return GetThreadLocalStorage()->id;
 	} else {
-		return EsSyscall(ES_SYSCALL_THREAD_GET_ID, thread, 0, 0, 0);
+		EsObjectID id;
+		EsSyscall(ES_SYSCALL_THREAD_GET_ID, thread, (uintptr_t) &id, 0, 0);
+		return id;
 	}
 }
 
-uintptr_t EsProcessGetID(EsHandle process) {
-	return EsSyscall(ES_SYSCALL_THREAD_GET_ID, process, 0, 0, 0);
+EsObjectID EsProcessGetID(EsHandle process) {
+	EsObjectID id;
+	EsSyscall(ES_SYSCALL_THREAD_GET_ID, process, (uintptr_t) &id, 0, 0);
+	return id;
 }
 
 ptrdiff_t EsDirectoryEnumerateChildrenFromHandle(EsHandle directory, EsDirectoryChild *buffer, size_t size) {

kernel/elf.cpp

@@ -164,6 +164,8 @@ EsError KLoadELF(KNode *node, KLoadedExecutable *executable) {
 
 #ifdef ARCH_X86_64
 			uint64_t name = CalculateCRC64(EsLiteral("$Executables/x86_64"));
+#else
+#error Unimplemented.
 #endif
 
 			BundleFile *files = (BundleFile *) ((BundleHeader *) header.mapAddress + 1);

kernel/syscall.cpp

@@ -1253,20 +1253,20 @@ SYSCALL_IMPLEMENT(ES_SYSCALL_THREAD_GET_ID) {
 	SYSCALL_HANDLE_2(argument0, KERNEL_OBJECT_THREAD | KERNEL_OBJECT_PROCESS, object);
 
 	if (object.type == KERNEL_OBJECT_THREAD) {
-		SYSCALL_RETURN(((Thread *) object.object)->id, false);
+		SYSCALL_WRITE(argument1, &((Thread *) object.object)->id, sizeof(EsObjectID));
 	} else if (object.type == KERNEL_OBJECT_PROCESS) {
 		Process *process = (Process *) object.object;
+		EsObjectID id = process->id;
 
 #ifdef ENABLE_POSIX_SUBSYSTEM
 		if (currentThread->posixData && currentThread->posixData->forkProcess) {
-			SYSCALL_RETURN(currentThread->posixData->forkProcess->id, false);
+			id = currentThread->posixData->forkProcess->id;
 		}
 #endif
 
-		SYSCALL_RETURN(process->id, false);
+		SYSCALL_WRITE(argument1, &id, sizeof(EsObjectID));
 	}
 
-	KernelPanic("ES_SYSCALL_THREAD_GET_ID - Unhandled case.\n");
 	SYSCALL_RETURN(ES_SUCCESS, false);
 }
 

util/api_table.ini

@@ -453,3 +453,4 @@ EsIconDisplaySetIcon=451
 EsFontDatabaseLookupByName=452
 _EsWindowGetHandle=453
 _EsUISetFont=454
+EsWorkQueue=455