Revert 35189 (caused test_shell_tests crashes on valgrind bot):

Take 2: Reenable TCMalloc on Linux and make POSIX signal handling async signal safe.
Reinstates r34096 and r34036, which were reverted by r34632 due to hanging ui_tests and browser_tests on bots.
I've been unable to repro on the trybots despite hitting them with a ton of try jobs, so I'm trying on the buildbots again.
BUG=http://crbug.com/30501

Review URL: http://codereview.chromium.org/505068

TBR=willchan@chromium.org
Review URL: http://codereview.chromium.org/517001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35192 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 32 insertions, 105 deletions

diff --git a/build/common.gypi b/build/common.gypi
index e41baf1..d1caf37 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -187,7 +187,7 @@
     'linux_strip_binary%': 0,
 
     # Enable TCMalloc.
-    'linux_use_tcmalloc%': 1,
+    'linux_use_tcmalloc%': 0,
 
     # Set to select the Title Case versions of strings in GRD files.
     'use_titlecase_in_grd_files%': 0,
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index f4528a5..ff1d17d 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -17,7 +17,6 @@
 #include "base/lazy_instance.h"
 #include "base/scoped_nsautorelease_pool.h"
 #include "base/path_service.h"
-#include "base/platform_thread.h"
 #include "base/process_util.h"
 #include "base/string_piece.h"
 #include "base/string_util.h"
@@ -73,7 +72,6 @@
 #include <errno.h>
 #include <signal.h>
 #include <sys/resource.h>
-#include "base/eintr_wrapper.h"
 #endif
 
 #if defined(USE_LINUX_BREAKPAD)
@@ -171,99 +169,30 @@ void RunUIMessageLoop(BrowserProcess* browser_process) {
 void SIGCHLDHandler(int signal) {
 }
 
-int g_shutdown_pipe_write_fd = -1;
-int g_shutdown_pipe_read_fd = -1;
-
 // Common code between SIG{HUP, INT, TERM}Handler.
-void GracefulShutdownHandler(int signal) {
+void GracefulShutdownHandler(int signal, const int expected_signal) {
+  DCHECK_EQ(signal, expected_signal);
+  LOG(INFO) << "Addressing signal " << expected_signal << " on "
+            << PlatformThread::CurrentId();
+
+  bool posted = ChromeThread::PostTask(
+      ChromeThread::UI, FROM_HERE,
+      NewRunnableFunction(BrowserList::CloseAllBrowsersAndExit));
+
   // Reinstall the default handler.  We had one shot at graceful shutdown.
   struct sigaction action;
   memset(&action, 0, sizeof(action));
   action.sa_handler = SIG_DFL;
-  CHECK(sigaction(signal, &action, NULL) == 0);
-
-  RAW_CHECK(g_shutdown_pipe_write_fd != -1);
-  RAW_CHECK(g_shutdown_pipe_read_fd != -1);
-  size_t bytes_written = 0;
-  do {
-    int rv = HANDLE_EINTR(
-        write(g_shutdown_pipe_write_fd,
-              reinterpret_cast<const char*>(&signal) + bytes_written,
-              sizeof(signal) - bytes_written));
-    RAW_CHECK(rv >= 0);
-    bytes_written += rv;
-  } while (bytes_written < sizeof(signal));
-
-  RAW_LOG(INFO,
-          "Successfully wrote to shutdown pipe, resetting signal handler.");
-}
-
-// See comment in BrowserMain, where sigaction is called.
-void SIGHUPHandler(int signal) {
-  RAW_CHECK(signal == SIGHUP);
-  RAW_LOG(INFO, "Handling SIGHUP.");
-  GracefulShutdownHandler(signal);
-}
-
-// See comment in BrowserMain, where sigaction is called.
-void SIGINTHandler(int signal) {
-  RAW_CHECK(signal == SIGINT);
-  RAW_LOG(INFO, "Handling SIGINT.");
-  GracefulShutdownHandler(signal);
-}
-
-// See comment in BrowserMain, where sigaction is called.
-void SIGTERMHandler(int signal) {
-  RAW_CHECK(signal == SIGTERM);
-  RAW_LOG(INFO, "Handling SIGTERM.");
-  GracefulShutdownHandler(signal);
-}
-
-class ShutdownDetector : public PlatformThread::Delegate {
- public:
-  explicit ShutdownDetector(int shutdown_fd);
-
-  virtual void ThreadMain();
-
- private:
-  const int shutdown_fd_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShutdownDetector);
-};
-
-ShutdownDetector::ShutdownDetector(int shutdown_fd)
-    : shutdown_fd_(shutdown_fd) {
-  CHECK(shutdown_fd_ != -1);
-}
+  CHECK(sigaction(expected_signal, &action, NULL) == 0);
 
-void ShutdownDetector::ThreadMain() {
-  int signal;
-  size_t bytes_read = 0;
-  ssize_t ret;
-  do {
-    ret = HANDLE_EINTR(
-        read(shutdown_fd_,
-             reinterpret_cast<char*>(&signal) + bytes_read,
-             sizeof(signal) - bytes_read));
-    if (ret < 0) {
-      NOTREACHED() << "Unexpected error: " << strerror(errno);
-      break;
-    } else if (ret == 0) {
-      NOTREACHED() << "Unexpected closure of shutdown pipe.";
-      break;
-    }
-    bytes_read += ret;
-  } while (bytes_read < sizeof(signal));
-
-  LOG(INFO) << "Handling shutdown for signal " << signal << ".";
-
-  if (!ChromeThread::PostTask(
-      ChromeThread::UI, FROM_HERE,
-      NewRunnableFunction(BrowserList::CloseAllBrowsersAndExit))) {
+  if (posted) {
+    LOG(INFO) << "Posted task to UI thread; resetting signal "
+              << expected_signal << " handler";
+  } else {
     // Without a UI thread to post the exit task to, there aren't many
     // options.  Raise the signal again.  The default handler will pick it up
     // and cause an ungraceful exit.
-    LOG(WARNING) << "No UI thread, exiting ungracefully.";
+    LOG(WARNING) << "No UI thread, exiting ungracefully";
     kill(getpid(), signal);
 
     // The signal may be handled on another thread.  Give that a chance to
@@ -276,11 +205,26 @@ void ShutdownDetector::ThreadMain() {
     // normally used to indicate an exit by this signal's default handler.
     // This mechanism isn't a de jure standard, but even in the worst case, it
     // should at least result in an immediate exit.
-    LOG(WARNING) << "Still here, exiting really ungracefully.";
+    LOG(WARNING) << "Still here, exiting really ungracefully";
     _exit(signal | (1 << 7));
   }
 }
 
+// See comment in BrowserMain, where sigaction is called.
+void SIGHUPHandler(int signal) {
+  GracefulShutdownHandler(signal, SIGHUP);
+}
+
+// See comment in BrowserMain, where sigaction is called.
+void SIGINTHandler(int signal) {
+  GracefulShutdownHandler(signal, SIGINT);
+}
+
+// See comment in BrowserMain, where sigaction is called.
+void SIGTERMHandler(int signal) {
+  GracefulShutdownHandler(signal, SIGTERM);
+}
+
 // Sets the file descriptor soft limit to |max_descriptors| or the OS hard
 // limit, whichever is lower.
 void SetFileDescriptorLimit(unsigned int max_descriptors) {
@@ -419,23 +363,6 @@ int BrowserMain(const MainFunctionParams& parameters) {
   // Register the main thread by instantiating it, but don't call any methods.
   ChromeThread main_thread(ChromeThread::UI, MessageLoop::current());
 
-#if defined(OS_POSIX)
-  int pipefd[2];
-  int ret = pipe(pipefd);
-  if (ret < 0) {
-    PLOG(DFATAL) << "Failed to create pipe";
-  } else {
-    g_shutdown_pipe_read_fd = pipefd[0];
-    g_shutdown_pipe_write_fd = pipefd[1];
-    const size_t kShutdownDetectorThreadStackSize = 4096;
-    if (!PlatformThread::CreateNonJoinable(
-        kShutdownDetectorThreadStackSize,
-        new ShutdownDetector(g_shutdown_pipe_read_fd))) {
-      LOG(DFATAL) << "Failed to create shutdown detector task.";
-    }
-  }
-#endif  // defined(OS_POSIX)
-
   FilePath user_data_dir;
 #if defined(OS_WIN)
   PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);