Fuchsia: Initial check-in.

runtime/vm/os_thread_fuchsia.cc

Index: runtime/vm/os_thread_fuchsia.cc
diff --git a/runtime/vm/os_thread_linux.cc b/runtime/vm/os_thread_fuchsia.cc
similarity index 88%
copy from runtime/vm/os_thread_linux.cc
copy to runtime/vm/os_thread_fuchsia.cc
index 969504270e97e5a773c9bb6fddae4363a139b86c..c3e8d25173152579227bde779fa1c3fc798b53ec 100644
--- a/runtime/vm/os_thread_linux.cc
+++ b/runtime/vm/os_thread_fuchsia.cc
@@ -1,30 +1,24 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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"  // NOLINT
-
-#if defined(TARGET_OS_LINUX)
+#if defined(TARGET_OS_FUCHSIA)
 
 #include "vm/os_thread.h"
+#include "vm/os_thread_fuchsia.h"
 
 #include <errno.h>  // NOLINT
-#include <sys/resource.h>  // NOLINT
-#include <sys/syscall.h>  // NOLINT
-#include <sys/time.h>  // NOLINT
+#include <magenta/syscalls.h>
+#include <magenta/types.h>
 
 #include "platform/assert.h"
-#include "platform/signal_blocker.h"
-#include "platform/utils.h"
 
 namespace dart {
 
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
-    const int kBufferSize = 1024; \
-    char error_buf[kBufferSize]; \
-    FATAL2("pthread error: %d (%s)", result, \
-           Utils::StrError(result, error_buf, kBufferSize)); \
+    FATAL1("pthread error: %d", result); \
   }
 
 
@@ -41,9 +35,8 @@ namespace dart {
   if (result != 0) { \
     const int kBufferSize = 1024; \
     char error_buf[kBufferSize]; \
-    fprintf(stderr, "%s:%d: pthread error: %d (%s)\n", \
-            __FILE__, __LINE__, result, \
-            Utils::StrError(result, error_buf, kBufferSize)); \
+    fprintf(stderr, "%s:%d: pthread error: %d\n", \
+            __FILE__, __LINE__, result); \
     return result; \
   }
 #else
@@ -53,11 +46,12 @@ namespace dart {
 
 
 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);
+  // time in nanoseconds.
+  mx_time_t now = _magenta_current_time();
+  mx_time_t target = now + (micros * kNanosecondsPerMicrosecond);
+  int64_t secs = target / kNanosecondsPerSecond;
+  int64_t nanos = target - (secs * kNanosecondsPerSecond);
+
   ts->tv_sec += secs;
   ts->tv_nsec += nanos;
   if (ts->tv_nsec >= kNanosecondsPerSecond) {
@@ -87,21 +81,6 @@ class ThreadStartData {
 };
 
 
-// Spawned threads inherit their spawner's signal mask. We sometimes spawn
-// threads for running Dart code from a thread that is blocking SIGPROF.
-// This function explicitly unblocks SIGPROF so the profiler continues to
-// sample this thread.
-static void UnblockSIGPROF() {
-  sigset_t set;
-  sigemptyset(&set);
-  sigaddset(&set, SIGPROF);
-  int r = pthread_sigmask(SIG_UNBLOCK, &set, NULL);
-  USE(r);
-  ASSERT(r == 0);
-  ASSERT(!CHECK_IS_BLOCKING(SIGPROF));
-}
-
-
 // Dispatch to the thread start function provided by the caller. This trampoline
 // is used to ensure that the thread is properly destroyed if the thread just
 // exits.
@@ -118,7 +97,6 @@ static void* ThreadStart(void* data_ptr) {
   if (thread != NULL) {
     OSThread::SetCurrent(thread);
     thread->set_name(name);
-    UnblockSIGPROF();
     // Call the supplied thread start function handing it its parameters.
     function(parameter);
   }
@@ -189,9 +167,12 @@ ThreadId OSThread::GetCurrentThreadId() {
 }
 
 
+#ifndef PRODUCT
 ThreadId OSThread::GetCurrentThreadTraceId() {
-  return syscall(__NR_gettid);
+  UNIMPLEMENTED();
+  return 0;
 }
+#endif  // PRODUCT
 
 
 ThreadJoinId OSThread::GetCurrentThreadJoinId(OSThread* thread) {
@@ -452,4 +433,4 @@ void Monitor::NotifyAll() {
 
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_LINUX)
+#endif  // defined(TARGET_OS_FUCHSIA)