Move signal_blocker to platform and use it by default in TEMP_FAILURE_RETRY.

runtime/bin/signal_blocker.h

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef BIN_SIGNAL_BLOCKER_H_
-#define BIN_SIGNAL_BLOCKER_H_
-
-#include "platform/globals.h"
-
-#if defined(TARGET_OS_WINDOWS)
-#error Do not include this file on Windows.
-#endif
-
-#include <signal.h>  // NOLINT
-
-#include "platform/thread.h"
-
-namespace dart {
-namespace bin {
-
-class ThreadSignalBlocker {
- public:
-  explicit ThreadSignalBlocker(int sig) {
-    sigset_t signal_mask;
-    sigemptyset(&signal_mask);
-    sigaddset(&signal_mask, sig);
-    // Add sig to signal mask.
-    int r = pthread_sigmask(SIG_BLOCK, &signal_mask, &old);
-    USE(r);
-    ASSERT(r == 0);
-  }
-
-  ThreadSignalBlocker(int sigs_count, const int sigs[]) {
-    sigset_t signal_mask;
-    sigemptyset(&signal_mask);
-    for (int i = 0; i < sigs_count; i++) {
-      sigaddset(&signal_mask, sigs[i]);
-    }
-    // Add sig to signal mask.
-    int r = pthread_sigmask(SIG_BLOCK, &signal_mask, &old);
-    USE(r);
-    ASSERT(r == 0);
-  }
-
-  ~ThreadSignalBlocker() {
-    // Restore signal mask.
-    int r = pthread_sigmask(SIG_SETMASK, &old, NULL);
-    USE(r);
-    ASSERT(r == 0);
-  }
-
- private:
-  sigset_t old;
-};
-
-
-#define TEMP_FAILURE_RETRY_BLOCK_SIGNALS(expression)                           \
-    ({ ThreadSignalBlocker tsb(SIGPROF);                                       \
-       intptr_t __result;                                                      \
-       do {                                                                    \
-         __result = (expression);                                              \
-       } while ((__result == -1L) && (errno == EINTR));                        \
-       __result; })
-
-#define VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(expression)                      \
-    (static_cast<void>(TEMP_FAILURE_RETRY_BLOCK_SIGNALS(expression)))
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // BIN_SIGNAL_BLOCKER_H_