[Android] Deprecate pthread_cond_timedwait_monotonic

base/synchronization/condition_variable_posix.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/synchronization/condition_variable.h"
 
 #include <errno.h>
 #include <sys/time.h>
 
 #include "base/logging.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 
 namespace base {
 
 ConditionVariable::ConditionVariable(Lock* user_lock)
     : user_mutex_(user_lock->lock_.native_handle())
 #if !defined(NDEBUG)
     , user_lock_(user_lock)
 #endif
 {
   int rv = 0;
   // http://crbug.com/293736
   // NaCl doesn't support monotonic clock based absolute deadlines.
-  // Android supports it through the non-standard
-  // pthread_cond_timedwait_monotonic_np.
+  // On older Android platform versions, it's supported through the
+  // non-standard pthread_cond_timedwait_monotonic_np. Newer platform
+  // versions have pthread_condattr_setclock.
   // Mac can use relative time deadlines.
-#if !defined(OS_MACOSX) && !defined(OS_NACL) && !defined(OS_ANDROID)
+#if !defined(OS_MACOSX) && !defined(OS_NACL) && \
+      !(defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC))
   pthread_condattr_t attrs;
   rv = pthread_condattr_init(&attrs);
   DCHECK_EQ(0, rv);
   pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC);
   rv = pthread_cond_init(&condition_, &attrs);
   pthread_condattr_destroy(&attrs);
 #else
   rv = pthread_cond_init(&condition_, NULL);
 #endif
   DCHECK_EQ(0, rv);
@@ skipping 46 matching lines @@
   absolute_time.tv_sec = now.tv_sec;
   absolute_time.tv_nsec = now.tv_nsec;
 #endif
 
   absolute_time.tv_sec += relative_time.tv_sec;
   absolute_time.tv_nsec += relative_time.tv_nsec;
   absolute_time.tv_sec += absolute_time.tv_nsec / Time::kNanosecondsPerSecond;
   absolute_time.tv_nsec %= Time::kNanosecondsPerSecond;
   DCHECK_GE(absolute_time.tv_sec, now.tv_sec);  // Overflow paranoia
 
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
   int rv = pthread_cond_timedwait_monotonic_np(
       &condition_, user_mutex_, &absolute_time);
 #else
   int rv = pthread_cond_timedwait(&condition_, user_mutex_, &absolute_time);
-#endif  // OS_ANDROID
+#endif  // OS_ANDROID && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
 #endif  // OS_MACOSX
 
   DCHECK(rv == 0 || rv == ETIMEDOUT);
 #if !defined(NDEBUG)
   user_lock_->CheckUnheldAndMark();
 #endif
 }
 
 void ConditionVariable::Broadcast() {
   int rv = pthread_cond_broadcast(&condition_);
   DCHECK_EQ(0, rv);
 }
 
 void ConditionVariable::Signal() {
   int rv = pthread_cond_signal(&condition_);
   DCHECK_EQ(0, rv);
 }
 
 }  // namespace base