[NFC][sanitizer] Use tid_t instead of int in ThreadLister (llvm#111941)

Author: vitalybuka

compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

@@ -1086,7 +1086,7 @@ ThreadLister::Result ThreadLister::ListThreads(
   }
 }
 
-const char *ThreadLister::LoadStatus(int tid) {
+const char *ThreadLister::LoadStatus(tid_t tid) {
   auto cleanup = at_scope_exit([&] {
     // Resize back to capacity if it is downsized by `ReadFileToVector`.
     buffer_.resize(buffer_.capacity());
@@ -1097,7 +1097,7 @@ const char *ThreadLister::LoadStatus(int tid) {
   return buffer_.data();
 }
 
-bool ThreadLister::IsAlive(int tid) {
+bool ThreadLister::IsAlive(tid_t tid) {
   // /proc/%d/task/%d/status uses same call to detect alive threads as
   // proc_task_readdir. See task_state implementation in Linux.
   static const char kPrefix[] = "\nPPid:";

compiler-rt/lib/sanitizer_common/sanitizer_linux.h

@@ -103,10 +103,10 @@ class ThreadLister {
     Ok,
   };
   Result ListThreads(InternalMmapVector<tid_t> *threads);
-  const char *LoadStatus(int tid);
+  const char *LoadStatus(tid_t tid);
 
  private:
-  bool IsAlive(int tid);
+  bool IsAlive(tid_t tid);
 
   InternalScopedString task_path_;
   InternalScopedString status_path_;