Hoist ErrnoRestorer out of common.

PiperOrigin-RevId: 715092604
Change-Id: I65a38d996093227ef8c8e17fd7e3f0d730a7723c

tcmalloc/BUILD

@@ -313,6 +313,7 @@ create_tcmalloc_libraries(
         "//tcmalloc/internal:stacktrace_filter",
         "//tcmalloc/internal:sysinfo",
         "//tcmalloc/internal:timeseries_tracker",
+        "//tcmalloc/internal:util",
         "//tcmalloc/selsan",
         "@com_google_absl//absl/algorithm:container",
         "@com_google_absl//absl/base",

tcmalloc/common.h

@@ -302,22 +302,6 @@ inline double safe_div(double a, double b) {
   }
 }
 
-// RAII class that will restore errno to the value it has when created.
-class ErrnoRestorer {
- public:
-  ErrnoRestorer() : saved_errno_(errno) {}
-  ~ErrnoRestorer() { errno = saved_errno_; }
-
-  ErrnoRestorer(const ErrnoRestorer&) = delete;
-  ErrnoRestorer& operator=(const ErrnoRestorer&) = delete;
-
-  // Updates the errno value to restore to the current value.
-  void Override() { saved_errno_ = errno; }
-
- private:
-  int saved_errno_;
-};
-
 }  // namespace tcmalloc_internal
 }  // namespace tcmalloc
 GOOGLE_MALLOC_SECTION_END

tcmalloc/cpu_cache.h

@@ -51,6 +51,7 @@
 #include "tcmalloc/internal/percpu.h"
 #include "tcmalloc/internal/percpu_tcmalloc.h"
 #include "tcmalloc/internal/sysinfo.h"
+#include "tcmalloc/internal/util.h"
 #include "tcmalloc/pages.h"
 #include "tcmalloc/parameters.h"
 #include "tcmalloc/static_vars.h"

tcmalloc/internal/util.h

@@ -125,6 +125,22 @@ inline void ScopedSigmask::Setmask(int how, sigset_t *set, sigset_t *old) {
   TC_CHECK_EQ(result, 0);
 }
 
+// RAII class that will restore errno to the value it has when created.
+class ErrnoRestorer {
+ public:
+  ErrnoRestorer() : saved_errno_(errno) {}
+  ~ErrnoRestorer() { errno = saved_errno_; }
+
+  ErrnoRestorer(const ErrnoRestorer&) = delete;
+  ErrnoRestorer& operator=(const ErrnoRestorer&) = delete;
+
+  // Updates the errno value to restore to the current value.
+  void Override() { saved_errno_ = errno; }
+
+ private:
+  int saved_errno_;
+};
+
 }  // namespace tcmalloc_internal
 }  // namespace tcmalloc
 GOOGLE_MALLOC_SECTION_END

tcmalloc/pagemap.cc

@@ -23,6 +23,7 @@
 #include "tcmalloc/common.h"
 #include "tcmalloc/internal/config.h"
 #include "tcmalloc/internal/logging.h"
+#include "tcmalloc/internal/util.h"
 #include "tcmalloc/pages.h"
 #include "tcmalloc/span.h"
 #include "tcmalloc/static_vars.h"

tcmalloc/system-alloc.h

@@ -37,6 +37,7 @@
 #include "tcmalloc/internal/numa.h"
 #include "tcmalloc/internal/optimization.h"
 #include "tcmalloc/internal/page_size.h"
+#include "tcmalloc/internal/util.h"
 #include "tcmalloc/malloc_extension.h"
 
 #ifndef MADV_FREE