profiler: auto-flush capture writer every 3 seconds

To reduce the amount of data that could be lost in the buffer during a
terminating signal scenario, GJS can use the auto-flush feature of
SysprofCaptureWriter.

Related to GNOME/Initiatives#10

1 files changed, 7 insertions, 0 deletions

diff --git a/gjs/profiler.cpp b/gjs/profiler.cpp
index a8522317..c28080ea 100644
--- a/gjs/profiler.cpp
+++ b/gjs/profiler.cpp
@@ -50,6 +50,8 @@
 #    include <sysprof-capture.h>
 #endif
 
+#define FLUSH_DELAY_SECONDS 3
+
 /*
  * This is mostly non-exciting code wrapping the builtin Profiler in
  * mozjs. In particular, the profiler consumer is required to "bring your
@@ -425,6 +427,11 @@ gjs_profiler_start(GjsProfiler *self)
         return;
     }
 
+    /* Automatically flush to be resilient against SIGINT, etc */
+    sysprof_capture_writer_set_flush_delay(self->capture,
+                                           g_main_context_get_thread_default(),
+                                           FLUSH_DELAY_SECONDS);
+
     if (!gjs_profiler_extract_maps(self)) {
         g_warning("Failed to extract proc maps");
         g_clear_pointer(&self->capture, sysprof_capture_writer_unref);