1 files changed, 14 insertions, 0 deletions
diff --git a/tools/profiler/public/ProfilerControl.h b/tools/profiler/public/ProfilerControl.h
index 466d15eb69..ac145fac00 100644
--- a/tools/profiler/public/ProfilerControl.h
+++ b/tools/profiler/public/ProfilerControl.h
@@ -40,6 +40,8 @@ static inline void profiler_init(void* stackTop) {}
 static inline void profiler_shutdown(
     IsFastShutdown aIsFastShutdown = IsFastShutdown::No) {}
 
+static inline void profiler_lookup_download_directory() {}
+
 #else  // !MOZ_GECKO_PROFILER
 
 #  include "BaseProfiler.h"
@@ -123,6 +125,18 @@ void profiler_ensure_started(
     const char** aFilters, uint32_t aFilterCount, uint64_t aActiveTabID,
     const mozilla::Maybe<double>& aDuration = mozilla::Nothing());
 
+// Tell the profiler to look up the download directory for writing profiles.
+// With some features, such as signal control, we need to know the location of
+// a directory where we can save profiles to disk. Because we start the
+// profiler before we start the directory service, we can't access the
+// download directory at profiler startup. Similarly, when we need to get the
+// directory, we often can't, as we're running in non-main-thread contexts
+// that don't have access to the directory service. This function gives us a
+// third option, by giving us a hook to look for the download directory when
+// the time is right. This might be triggered internally (e.g. when we start
+// profiling), or externally, e.g. after the directory service is initialised.
+void profiler_lookup_download_directory();
+
 //---------------------------------------------------------------------------
 // Control the profiler
 //---------------------------------------------------------------------------