Sampling profiler

runtime/platform/thread_linux.cc

Index: runtime/platform/thread_linux.cc
diff --git a/runtime/platform/thread_linux.cc b/runtime/platform/thread_linux.cc
index acb78c71ed5423a0daeebcde32bb5c959b74adca..11e40de82331b363b4c050ac1ac05f9d1f7c5fa8 100644
--- a/runtime/platform/thread_linux.cc
+++ b/runtime/platform/thread_linux.cc
@@ -8,6 +8,7 @@
 #include "platform/thread.h"
 
 #include <errno.h>  // NOLINT
+#include <sys/resource.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
 
 #include "platform/assert.h"
@@ -39,10 +40,10 @@ namespace dart {
 #endif
 
 
-static void ComputeTimeSpec(struct timespec* ts, int64_t millis) {
-  int64_t secs = millis / kMillisecondsPerSecond;
+static void ComputeTimeSpecMicros(struct timespec* ts, int64_t micros) {
+  int64_t secs = micros / kMicrosecondsPerSecond;
   int64_t nanos =
-      (millis - (secs * kMillisecondsPerSecond)) * kNanosecondsPerMillisecond;
+      (micros - (secs * kMicrosecondsPerSecond)) * kNanosecondsPerMicrosecond;
   int result = clock_gettime(CLOCK_MONOTONIC, ts);
   ASSERT(result == 0);
   ts->tv_sec += secs;
@@ -54,6 +55,11 @@ static void ComputeTimeSpec(struct timespec* ts, int64_t millis) {
 }
 
 
+static void ComputeTimeSpec(struct timespec* ts, int64_t millis) {
+  ComputeTimeSpec(ts, millis * kMicrosecondsPerMillisecond);
+}
+
+
 class ThreadStartData {
  public:
   ThreadStartData(Thread::ThreadStartFunction function,
@@ -144,6 +150,22 @@ intptr_t Thread::GetMaxStackSize() {
 }
 
 
+ThreadId Thread::GetCurrentThreadId() {
+  return pthread_self();
+}
+
+
+void Thread::GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage) {
+  ASSERT(thread_id == GetCurrentThreadId());
+  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);
@@ -255,15 +277,20 @@ void Monitor::Exit() {
 
 
 Monitor::WaitResult Monitor::Wait(int64_t millis) {
+  return WaitMicros(millis * kMicrosecondsPerMillisecond);
+}
+
+
+Monitor::WaitResult Monitor::WaitMicros(int64_t micros) {
   // TODO(iposva): Do we need to track lock owners?
   Monitor::WaitResult retval = kNotified;
-  if (millis == 0) {
+  if (micros == kNoTimeout) {
     // Wait forever.
     int result = pthread_cond_wait(data_.cond(), data_.mutex());
     VALIDATE_PTHREAD_RESULT(result);
   } else {
     struct timespec ts;
-    ComputeTimeSpec(&ts, millis);
+    ComputeTimeSpecMicros(&ts, micros);
     int result = pthread_cond_timedwait(data_.cond(), data_.mutex(), &ts);
     ASSERT((result == 0) || (result == ETIMEDOUT));
     if (result == ETIMEDOUT) {