From c096fd02b4dfe8f29612e7ffea1143420f27c365 Mon Sep 17 00:00:00 2001
From: Riley Testut <riley@rileytestut.com>
Date: Wed, 19 Jun 2019 11:04:15 -0700
Subject: [PATCH] [AltServer] Enforces one installation at a time

Blocks dispatch queue until installation finishes, at which point the next installation can begin.
---
 AltServer/Devices/ALTDeviceManager.mm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/AltServer/Devices/ALTDeviceManager.mm b/AltServer/Devices/ALTDeviceManager.mm
index 287c922a..60a2d9ea 100644
--- a/AltServer/Devices/ALTDeviceManager.mm
+++ b/AltServer/Devices/ALTDeviceManager.mm
@@ -319,6 +319,8 @@ NSErrorDomain const ALTDeviceErrorDomain = @"com.rileytestut.ALTDeviceError";
             client = NULL;
         }
         
+        dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
+        
         NSProgress *installationProgress = [NSProgress progressWithTotalUnitCount:100 parent:progress pendingUnitCount:1];
         
         self.installationProgress[UUID] = installationProgress;
@@ -333,12 +335,16 @@ NSErrorDomain const ALTDeviceErrorDomain = @"com.rileytestut.ALTDeviceError";
                     NSLog(@"Error removing temporary directory. %@", error);
                 }
             }
+            
+            dispatch_semaphore_signal(semaphore);
         };
         
         NSLog(@"Installing to device %@...", udid);
         
         instproxy_install(ipc, destinationURL.relativePath.fileSystemRepresentation, options, ALTDeviceManagerUpdateStatus, uuidString);
         instproxy_client_options_free(options);
+        
+        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
     });
         
     return progress;