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fix(mobile): prevent concurrent refresh and processing tasks (#22111)

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* task semaphore

* always call setTaskCompleted
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Mert 2025-09-16 18:06:19 -04:00 committed by GitHub
parent 1710230d61
commit f118bb7e08
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GPG Key ID: B5690EEEBB952194
1 changed files with 10 additions and 2 deletions
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12
mobile/ios/Runner/Background/BackgroundWorkerApiImpl.swift
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@ -16,6 +16,7 @@ class BackgroundWorkerApiImpl: BackgroundWorkerFgHostApi {
private static let refreshTaskID = "app.alextran.immich.background.refreshUpload"
private static let processingTaskID = "app.alextran.immich.background.processingUpload"
private static let taskSemaphore = DispatchSemaphore(value: 1)
public static func registerBackgroundWorkers() {
BGTaskScheduler.shared.register(
@ -59,12 +60,18 @@ class BackgroundWorkerApiImpl: BackgroundWorkerFgHostApi {
private static func handleBackgroundRefresh(task: BGAppRefreshTask) {
scheduleRefreshWorker()
// Restrict the refresh task to run only for a maximum of (maxSeconds) seconds
runBackgroundWorker(task: task, taskType: .refresh, maxSeconds: 20)
// If another task is running, cede the background time back to the OS
if taskSemaphore.wait(timeout: .now()) == .success {
// Restrict the refresh task to run only for a maximum of (maxSeconds) seconds
runBackgroundWorker(task: task, taskType: .refresh, maxSeconds: 20)
} else {
task.setTaskCompleted(success: false)
}
}
private static func handleBackgroundProcessing(task: BGProcessingTask) {
scheduleProcessingWorker()
taskSemaphore.wait()
// There are no restrictions for processing tasks. Although, the OS could signal expiration at any time
runBackgroundWorker(task: task, taskType: .processing, maxSeconds: nil)
}
@ -80,6 +87,7 @@ class BackgroundWorkerApiImpl: BackgroundWorkerFgHostApi {
* - maxSeconds: Optional timeout for the operation in seconds
*/
private static func runBackgroundWorker(task: BGTask, taskType: BackgroundTaskType, maxSeconds: Int?) {
defer { taskSemaphore.signal() }
let semaphore = DispatchSemaphore(value: 0)
var isSuccess = true