- Fix delta time calculation in LinuxSemaphore::Wait.

src/platform-linux.cc

 // Copyright 2006-2008 the V8 project authors. 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
@@ skipping 491 matching lines @@
   while (true) {
     int result = sem_wait(&sem_);
     if (result == 0) return;  // Successfully got semaphore.
     CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
   }
 }
 
 
 bool LinuxSemaphore::Wait(int timeout) {
   const long kOneSecondMicros = 1000000;  // NOLINT
-  const long kOneSecondNanos = 1000000000;  // NOLINT
-
+  
   // Split timeout into second and nanosecond parts.
-  long nanos = (timeout % kOneSecondMicros) * 1000;  // NOLINT
-  time_t secs = timeout / kOneSecondMicros;
-
-  // Get the current realtime clock.
-  struct timespec ts;
-  if (clock_gettime(CLOCK_REALTIME, &ts) == -1) {
+  struct timeval delta;
+  delta.tv_usec = timeout % kOneSecondMicros;
+  delta.tv_sec = timeout / kOneSecondMicros;
+  
+  struct timeval current_time;
+  // Get the current time.
+  if (gettimeofday(&current_time, NULL) == -1) {
     return false;
   }
-
-  // Calculate real time for end of timeout.
-  ts.tv_nsec += nanos;
-  if (ts.tv_nsec >= kOneSecondNanos) {
-    ts.tv_nsec -= kOneSecondNanos;
-    ts.tv_nsec++;
-  }
-  ts.tv_sec += secs;
-
+  
+  // Calculate time for end of timeout.
+  struct timeval end_time;
+  timeradd(&current_time, &delta, &end_time);
+  
+  struct timespec ts;
+  TIMEVAL_TO_TIMESPEC(&end_time, &ts);
   // Wait for semaphore signalled or timeout.
   while (true) {
     int result = sem_timedwait(&sem_, &ts);
     if (result == 0) return true;  // Successfully got semaphore.
     if (result > 0) {
       // For glibc prior to 2.3.4 sem_timedwait returns the error instead of -1.
       errno = result;
       result = -1;
     }
     if (result == -1 && errno == ETIMEDOUT) return false;  // Timeout.
@@ skipping 127 matching lines @@
   }
 
   // This sampler is no longer the active sampler.
   active_sampler_ = NULL;
   active_ = false;
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal