From 23f750b068ddf5b20fb5d153a798b22562368992 Mon Sep 17 00:00:00 2001
From: Dan Albert <danalbert@google.com>
Date: Thu, 30 Apr 2015 12:52:21 -0700
Subject: [PATCH] Remove libbacktrace definition of gettid.

Also simplifies the Darwin implementation of gettid, because
apparently libbacktrace had a better way of doing it.

Change-Id: I9e14f9176b167405a5aaa5b8a0db0327c7126271
---
 libbacktrace/Backtrace.cpp        |  2 ++
 libbacktrace/BacktraceCurrent.cpp |  2 ++
 libbacktrace/backtrace_test.cpp   | 17 +++++++++--------
 libbacktrace/thread_utils.c       | 17 ++---------------
 libbacktrace/thread_utils.h       |  2 --
 libcutils/threads.c               |  7 +------
 6 files changed, 16 insertions(+), 31 deletions(-)

diff --git a/libbacktrace/Backtrace.cpp b/libbacktrace/Backtrace.cpp
index 91ca8b7e5cd0..b2d82976d55a 100644
--- a/libbacktrace/Backtrace.cpp
+++ b/libbacktrace/Backtrace.cpp
@@ -27,6 +27,8 @@
 #include <backtrace/Backtrace.h>
 #include <backtrace/BacktraceMap.h>
 
+#include <cutils/threads.h>
+
 #include "BacktraceLog.h"
 #include "thread_utils.h"
 #include "UnwindCurrent.h"
diff --git a/libbacktrace/BacktraceCurrent.cpp b/libbacktrace/BacktraceCurrent.cpp
index fd1f4da7bcdd..14f04de5eecd 100644
--- a/libbacktrace/BacktraceCurrent.cpp
+++ b/libbacktrace/BacktraceCurrent.cpp
@@ -29,6 +29,8 @@
 #include <backtrace/Backtrace.h>
 #include <backtrace/BacktraceMap.h>
 
+#include <cutils/threads.h>
+
 #include "BacktraceCurrent.h"
 #include "BacktraceLog.h"
 #include "ThreadEntry.h"
diff --git a/libbacktrace/backtrace_test.cpp b/libbacktrace/backtrace_test.cpp
index 4af65923edcb..36c73c5dbbdb 100644
--- a/libbacktrace/backtrace_test.cpp
+++ b/libbacktrace/backtrace_test.cpp
@@ -30,20 +30,21 @@
 #include <time.h>
 #include <unistd.h>
 
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <vector>
+
 #include <backtrace/Backtrace.h>
 #include <backtrace/BacktraceMap.h>
 
-// For the THREAD_SIGNAL definition.
-#include "BacktraceCurrent.h"
-
 #include <cutils/atomic.h>
-#include <gtest/gtest.h>
+#include <cutils/threads.h>
 
-#include <algorithm>
-#include <memory>
-#include <string>
-#include <vector>
+#include <gtest/gtest.h>
 
+// For the THREAD_SIGNAL definition.
+#include "BacktraceCurrent.h"
 #include "thread_utils.h"
 
 // Number of microseconds per milliseconds.
diff --git a/libbacktrace/thread_utils.c b/libbacktrace/thread_utils.c
index 6f4cd3c4465f..e75f56e39e39 100644
--- a/libbacktrace/thread_utils.c
+++ b/libbacktrace/thread_utils.c
@@ -16,25 +16,12 @@
 
 #include "thread_utils.h"
 
-#if defined(__APPLE__)
+#if !defined(__BIONIC__)
 
-#include <sys/syscall.h>
-
-// Mac OS >= 10.6 has a system call equivalent to Linux's gettid().
-pid_t gettid() {
-  return syscall(SYS_thread_selfid);
-}
-
-#elif !defined(__BIONIC__)
-
-// glibc doesn't implement or export either gettid or tgkill.
+// glibc doesn't implement or export tgkill.
 #include <unistd.h>
 #include <sys/syscall.h>
 
-pid_t gettid() {
-  return syscall(__NR_gettid);
-}
-
 int tgkill(int tgid, int tid, int sig) {
   return syscall(__NR_tgkill, tgid, tid, sig);
 }
diff --git a/libbacktrace/thread_utils.h b/libbacktrace/thread_utils.h
index ae4c9290401e..df83581f1620 100644
--- a/libbacktrace/thread_utils.h
+++ b/libbacktrace/thread_utils.h
@@ -23,8 +23,6 @@ __BEGIN_DECLS
 
 int tgkill(int tgid, int tid, int sig);
 
-pid_t gettid();
-
 __END_DECLS
 
 #endif /* _LIBBACKTRACE_THREAD_UTILS_H */
diff --git a/libcutils/threads.c b/libcutils/threads.c
index 3d8dd484896c..036f8c5b7ef6 100644
--- a/libcutils/threads.c
+++ b/libcutils/threads.c
@@ -35,12 +35,7 @@
 #ifndef __ANDROID__
 pid_t gettid() {
 #if defined(__APPLE__)
-  uint64_t owner;
-  int rc = pthread_threadid_np(NULL, &owner);
-  if (rc != 0) {
-    abort();
-  }
-  return owner;
+  return syscall(SYS_thread_selfid);
 #elif defined(__linux__)
   return syscall(__NR_gettid);
 #elif defined(_WIN32)