text: /* Copyright (c) 2008-2009, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * ---
   * Author: Kostya Serebryany
   */
  
  #ifdef __cplusplus
  # error "This file should be built as pure C to avoid name mangling"
  #endif
  
  #include <stdlib.h>
  #include <string.h>
  
  #include "base/dynamic_annotations.h"
  
  #ifdef __GNUC__
  /* valgrind.h uses gcc extensions so it won't build with other compilers */
  # ifdef HAVE_VALGRIND_H    /* prefer the user's copy if they have it */
  #  include <valgrind.h>
  # else                     /* otherwise just use the copy that we have */
  #  include "third_party/valgrind.h"
  # endif
  #endif
  
  /* Each function is empty and called (via a macro) only in debug mode.
     The arguments are captured by dynamic tools at runtime. */
  
  #if DYNAMIC_ANNOTATIONS_ENABLED == 1
  
  void AnnotateRWLockCreate(const char *file, int line,
                            const volatile void *lock){}
  void AnnotateRWLockDestroy(const char *file, int line,
                             const volatile void *lock){}
  void AnnotateRWLockAcquired(const char *file, int line,
                              const volatile void *lock, long is_w){}
  void AnnotateRWLockReleased(const char *file, int line,
                              const volatile void *lock, long is_w){}
  void AnnotateBarrierInit(const char *file, int line,
                           const volatile void *barrier, long count,
                           long reinitialization_allowed) {}
  void AnnotateBarrierWaitBefore(const char *file, int line,
                                 const volatile void *barrier) {}
  void AnnotateBarrierWaitAfter(const char *file, int line,
                                const volatile void *barrier) {}
  void AnnotateBarrierDestroy(const char *file, int line,
                              const volatile void *barrier) {}
  
  void AnnotateCondVarWait(const char *file, int line,
                           const volatile void *cv,
                           const volatile void *lock){}
  void AnnotateCondVarSignal(const char *file, int line,
                             const volatile void *cv){}
  void AnnotateCondVarSignalAll(const char *file, int line,
                                const volatile void *cv){}
  void AnnotatePublishMemoryRange(const char *file, int line,
                                  const volatile void *address,
                                  long size){}
  void AnnotateUnpublishMemoryRange(const char *file, int line,
                                    const volatile void *address,
                                    long size){}
  void AnnotatePCQCreate(const char *file, int line,
                         const volatile void *pcq){}
  void AnnotatePCQDestroy(const char *file, int line,
                          const volatile void *pcq){}
  void AnnotatePCQPut(const char *file, int line,
                      const volatile void *pcq){}
  void AnnotatePCQGet(const char *file, int line,
                      const volatile void *pcq){}
  void AnnotateNewMemory(const char *file, int line,
                         const volatile void *mem,
                         long size){}
  void AnnotateExpectRace(const char *file, int line,
                          const volatile void *mem,
                          const char *description){}
  void AnnotateBenignRace(const char *file, int line,
                          const volatile void *mem,
                          const char *description){}
  void AnnotateBenignRaceSized(const char *file, int line,
                               const volatile void *mem,
                               long size,
                               const char *description) {}
  void AnnotateMutexIsUsedAsCondVar(const char *file, int line,
                                    const volatile void *mu){}
  void AnnotateTraceMemory(const char *file, int line,
                           const volatile void *arg){}
  void AnnotateThreadName(const char *file, int line,
                          const char *name){}
  void AnnotateIgnoreReadsBegin(const char *file, int line){}
  void AnnotateIgnoreReadsEnd(const char *file, int line){}
  void AnnotateIgnoreWritesBegin(const char *file, int line){}
  void AnnotateIgnoreWritesEnd(const char *file, int line){}
  void AnnotateEnableRaceDetection(const char *file, int line, int enable){}
  void AnnotateNoOp(const char *file, int line,
                    const volatile void *arg){}
  void AnnotateFlushState(const char *file, int line){}
  
  #endif  /* DYNAMIC_ANNOTATIONS_ENABLED == 1 */
  
  static int GetRunningOnValgrind(void) {
  #ifdef RUNNING_ON_VALGRIND
    if (RUNNING_ON_VALGRIND) return 1;
  #endif
    // TODO(csilvers): use GetenvBeforeMain() instead?  Will need to
    //                 change it to be extern "C".
    char *running_on_valgrind_str = getenv("RUNNING_ON_VALGRIND");
    if (running_on_valgrind_str) {
      return strcmp(running_on_valgrind_str, "0") != 0;
    }
    return 0;
  }
  
  /* See the comments in dynamic_annotations.h */
  int RunningOnValgrind(void) {
    static volatile int running_on_valgrind = -1;
    /* C doesn't have thread-safe initialization of statics, and we
       don't want to depend on pthread_once here, so hack it. */
    int local_running_on_valgrind = running_on_valgrind;
    if (local_running_on_valgrind == -1)
      running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
    return local_running_on_valgrind;
  }
  