From d63c15d582eb814894632f691fbf8f3a2e81289b Mon Sep 17 00:00:00 2001
From: Lysann Tranvouez <lysann.tranvouez@gmail.com>
Date: Mon, 29 Sep 2025 01:28:30 +0200
Subject: [PATCH] detour_manage_thread

---
 src/mach_detours.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/src/mach_detours.c b/src/mach_detours.c
index d4b8c09..cf848e9 100644
--- a/src/mach_detours.c
+++ b/src/mach_detours.c
@@ -405,3 +405,46 @@ mach_error_t detour_transaction_commit_ex(detour_func_t** out_failed_target)
     }
     return s_pending_error;
 }
+
+mach_error_t detour_manage_thread(thread_t thread)
+{
+    mach_error_t error;
+
+    // If any of the pending operations failed, then we don't need to do this.
+    if (s_pending_error != err_none) {
+        return s_pending_error;
+    }
+
+    // must be the transaction thread
+    if (s_transaction_thread != mach_thread_self()) {
+        return detour_err_wrong_thread;
+    }
+
+    // Silently (and safely) drop any attempt to suspend our own thread.
+    if (thread == mach_thread_self()) {
+        return err_none;
+    }
+
+    detour_pending_thread* new_pending_thread = malloc(sizeof(detour_pending_thread));
+    if (!new_pending_thread) {
+        error = KERN_RESOURCE_SHORTAGE;
+    fail:
+        free(new_pending_thread);
+        s_pending_error = error;
+        s_pending_error_pointer = nullptr;
+        DETOUR_BREAK();
+        return error;
+    }
+
+    error = thread_suspend(thread);
+    if (error != err_none) {
+        DETOUR_BREAK();
+        goto fail;
+    }
+
+    new_pending_thread->thread = thread;
+    new_pending_thread->next = s_pending_threads_head;
+    s_pending_threads_head = new_pending_thread;
+
+    return err_none;
+}