Sampling profiler

runtime/platform/thread_linux.cc

 // Copyright (c) 2012, 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "platform/thread.h"
 
 #include <errno.h>  // NOLINT
+#include <sys/resource.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
 
 #include "platform/assert.h"
 
 namespace dart {
 
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
     const int kBufferSize = 1024; \
     char error_buf[kBufferSize]; \
@@ skipping 26 matching lines @@
   ASSERT(result == 0);
   ts->tv_sec += secs;
   ts->tv_nsec += nanos;
   if (ts->tv_nsec >= kNanosecondsPerSecond) {
     ts->tv_sec += 1;
     ts->tv_nsec -= kNanosecondsPerSecond;
   }
 }
 
 
+static void ComputeTimeSpecMicros(struct timespec* ts, int64_t micros) {
+  int64_t secs = micros / kMicrosecondsPerSecond;
+  int64_t nanos =
+      (micros - (secs * kMicrosecondsPerSecond)) * kNanosecondsPerMicrosecond;
+  int result = clock_gettime(CLOCK_MONOTONIC, ts);
+  ASSERT(result == 0);
+  ts->tv_sec += secs;
+  ts->tv_nsec += nanos;
+  if (ts->tv_nsec >= kNanosecondsPerSecond) {
+    ts->tv_sec += 1;
+    ts->tv_nsec -= kNanosecondsPerSecond;
+  }

[siva, 2013/10/28 05:19:21]

This seems a repeat of the code above why not replace the code above
with ComputeTimeSpecMicros(ts, millis * 1000);

[Cutch, 2013/11/04 20:36:05]

Done.

+}
+
+
 class ThreadStartData {
  public:
   ThreadStartData(Thread::ThreadStartFunction function,
                   uword parameter)
       : function_(function), parameter_(parameter) {}
 
   Thread::ThreadStartFunction function() const { return function_; }
   uword parameter() const { return parameter_; }
 
  private:
@@ skipping 70 matching lines @@
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 
 intptr_t Thread::GetMaxStackSize() {
   const int kStackSize = (128 * kWordSize * KB);
   return kStackSize;
 }
 
 
+ThreadId Thread::GetCurrentThreadId() {
+  return pthread_self();
+}
+
+
+void Thread::GetThreadCPUUsage(int64_t* cpu_usage) {
+  ASSERT(cpu_usage != NULL);
+  struct timespec ts;
+  int r = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
+  ASSERT(r == 0);
+  *cpu_usage = (ts.tv_sec * kNanosecondsPerSecond + ts.tv_nsec) /
+               kNanosecondsPerMicrosecond;
+}
+
+
 Mutex::Mutex() {
   pthread_mutexattr_t attr;
   int result = pthread_mutexattr_init(&attr);
   VALIDATE_PTHREAD_RESULT(result);
 
 #if defined(DEBUG)
   result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
   VALIDATE_PTHREAD_RESULT(result);
 #endif  // defined(DEBUG)
 
@@ skipping 110 matching lines @@
     int result = pthread_cond_timedwait(data_.cond(), data_.mutex(), &ts);
     ASSERT((result == 0) || (result == ETIMEDOUT));
     if (result == ETIMEDOUT) {
       retval = kTimedOut;
     }
   }
   return retval;
 }
 
 
+Monitor::WaitResult Monitor::WaitMicros(int64_t micros) {
+  // TODO(iposva): Do we need to track lock owners?
+  Monitor::WaitResult retval = kNotified;
+  if (micros == 0) {

[siva, 2013/10/28 05:19:21]

should be if (micros == dart::Monitor::kNoTimeout)

[Cutch, 2013/11/04 20:36:05]

Done.

+    // Wait forever.
+    int result = pthread_cond_wait(data_.cond(), data_.mutex());
+    VALIDATE_PTHREAD_RESULT(result);
+  } else {
+    struct timespec ts;
+    ComputeTimeSpecMicros(&ts, micros);
+    int result = pthread_cond_timedwait(data_.cond(), data_.mutex(), &ts);
+    ASSERT((result == 0) || (result == ETIMEDOUT));
+    if (result == ETIMEDOUT) {
+      retval = kTimedOut;
+    }

[siva, 2013/10/28 05:19:21]

else {
  VALIDATE_PTHREAD_RESULT(result); ?
}

[Cutch, 2013/11/04 20:36:05]

The above ASSERT((result == 0) || (result == ETIMEDOUT));

Handles this.

+  }
+  return retval;
+}
+
+
 void Monitor::Notify() {
   // TODO(iposva): Do we need to track lock owners?
   int result = pthread_cond_signal(data_.cond());
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 
 void Monitor::NotifyAll() {
   // TODO(iposva): Do we need to track lock owners?
   int result = pthread_cond_broadcast(data_.cond());
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)