Revert 126020 - Experiment for updating the tcmalloc chromium branch to r144 (gperftools 2.0).

third_party/tcmalloc/chromium/src/maybe_threads.cc

Index: third_party/tcmalloc/chromium/src/maybe_threads.cc
===================================================================
--- third_party/tcmalloc/chromium/src/maybe_threads.cc	(revision 126022)
+++ third_party/tcmalloc/chromium/src/maybe_threads.cc	(working copy)
@@ -39,7 +39,6 @@
 #include "config.h"
 #include <assert.h>
 #include <string.h>    // for memcmp
-#include <stdio.h>     // for __isthreaded on FreeBSD
 // We don't actually need strings. But including this header seems to
 // stop the compiler trying to short-circuit our pthreads existence
 // tests and claiming that the address of a function is always
@@ -99,28 +98,9 @@
   }
 }
 
-
 static pthread_once_t pthread_once_init = PTHREAD_ONCE_INIT;
 int perftools_pthread_once(pthread_once_t *ctl,
                            void  (*init_routine) (void)) {
-#ifdef __FreeBSD__
-  // On __FreeBSD__, calling pthread_once on a system that is not
-  // linked with -pthread is silently a noop. :-( Luckily, we have a
-  // workaround: FreeBSD exposes __isthreaded in <stdio.h>, which is
-  // set to 1 when the first thread is spawned.  So on those systems,
-  // we can use our own separate pthreads-once mechanism, which is
-  // used until __isthreaded is 1 (which will never be true if the app
-  // is not linked with -pthread).
-  static bool pthread_once_ran_before_threads = false;
-  if (pthread_once_ran_before_threads) {
-    return 0;
-  }
-  if (!__isthreaded) {
-    init_routine();
-    pthread_once_ran_before_threads = true;
-    return 0;
-  }
-#endif
   if (pthread_once) {
     return pthread_once(ctl, init_routine);
   } else {