perf(telemetry): serialize batches on shared thread pool

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 - Native: store daemon logs, minidumps, crash envelopes, and scratch files in `.run` directories so they are cleaned up with the run instead of accumulating in the database root. Minidumps can still be retained with `cache_keep`, which stores `.dmp` sidecars alongside cached envelopes. ([#1976](https://github.com/getsentry/sentry-native/pull/1976))
 - Linux/ARM32: prevent recursive crashes when libunwind receives an unmapped initial instruction pointer during crash handling. ([#1977](https://github.com/getsentry/sentry-native/pull/1977))
+- Improve log and metric delivery when telemetry is captured faster than envelopes can be serialized by offloading serialization to an internal thread pool. ([#1946](https://github.com/getsentry/sentry-native/pull/1946))
 - Destroy condition variables as approriate when no longer needed. ([#2004](https://github.com/getsentry/sentry-native/pull/2004))
 
 ## 0.16.3

src/CMakeLists.txt

@@ -54,7 +54,6 @@ sentry_target_sources_cwd(sentry
 	sentry_session.h
 	sentry_slice.c
 	sentry_slice.h
-	sentry_spinlock.h
 	sentry_string.c
 	sentry_string.h
 	sentry_symbolizer.h
@@ -99,6 +98,7 @@ if(WIN32)
 	)
 elseif(NX OR PROSPERO)
 	sentry_target_sources_cwd(sentry
+		sentry_unix_spinlock.h
 		path/sentry_path_unix.c
 		process/sentry_process_none.c
 	)
@@ -108,6 +108,7 @@ else()
 		sentry_random.h
 		sentry_unix_pageallocator.c
 		sentry_unix_pageallocator.h
+		sentry_unix_spinlock.h
 		symbolizer/sentry_symbolizer_unix.c
 		path/sentry_path_unix.c
 		process/sentry_process_unix.c