Decrease SetThreadStackGuarantee value

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- Decrease SetThreadStackGuarantee value ([#1044](https://github.com/getsentry/sentry-native/pull/1044))
+
 ## 0.7.10
 
 **Fixes**:

src/backends/sentry_backend_crashpad.cpp

@@ -375,7 +375,7 @@ crashpad_backend_startup(
         }
     }
 
-#ifdef SENTRY_PLATFORM_WINDOWS
+#if defined(SENTRY_PLATFORM_WINDOWS) && !defined(SENTRY_BUILD_SHARED)
     sentry__reserve_thread_stack();
 #endif
 

src/sentry_os.c

@@ -140,12 +140,18 @@ sentry__get_os_context(void)
 void
 sentry__reserve_thread_stack(void)
 {
-    const unsigned long expected_stack_size = 64 * 1024;
+    const unsigned long page_size = 4 * 1024;
+    // 1 page for possible guard region
+    // 1 page for OS kernel32!RaiseException
+    // 1 page for possible debug infrastructure
+    // 1 page for handler
+    const unsigned long expected_stack_size = 4 * page_size;
     unsigned long stack_size = 0;
-    SetThreadStackGuarantee(&stack_size);
-    if (stack_size < expected_stack_size) {
-        stack_size = expected_stack_size;
-        SetThreadStackGuarantee(&stack_size);
+    if (SetThreadStackGuarantee(&stack_size)) {
+        if (stack_size < expected_stack_size) {
+            stack_size = expected_stack_size;
+            SetThreadStackGuarantee(&stack_size);
+        }
     }
 }