Fuchsia: Initial check-in.

runtime/vm/os_thread_fuchsia.cc

-// 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); \
   }
 
 
 #if defined(DEBUG)
 #define ASSERT_PTHREAD_SUCCESS(result) VALIDATE_PTHREAD_RESULT(result)
 #else
 // NOTE: This (currently) expands to a no-op.
 #define ASSERT_PTHREAD_SUCCESS(result) ASSERT(result == 0)
 #endif
 
 
 #ifdef DEBUG
 #define RETURN_ON_PTHREAD_FAILURE(result) \
   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
 #define RETURN_ON_PTHREAD_FAILURE(result) \
   if (result != 0) return result;
 #endif
 
 
 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) {
     ts->tv_sec += 1;
     ts->tv_nsec -= kNanosecondsPerSecond;
   }
 }
 
 
 class ThreadStartData {
  public:
   ThreadStartData(const char* name,
                   OSThread::ThreadStartFunction function,
                   uword parameter)
       : name_(name), function_(function), parameter_(parameter) {}
 
   const char* name() const { return name_; }
   OSThread::ThreadStartFunction function() const { return function_; }
   uword parameter() const { return parameter_; }
 
  private:
   const char* name_;
   OSThread::ThreadStartFunction function_;
   uword parameter_;
 
   DISALLOW_COPY_AND_ASSIGN(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.
 static void* ThreadStart(void* data_ptr) {
   ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
 
   const char* name = data->name();
   OSThread::ThreadStartFunction function = data->function();
   uword parameter = data->parameter();
   delete data;
 
   // Create new OSThread object and set as TLS for new thread.
   OSThread* thread = OSThread::CreateOSThread();
   if (thread != NULL) {
     OSThread::SetCurrent(thread);
     thread->set_name(name);
-    UnblockSIGPROF();
     // Call the supplied thread start function handing it its parameters.
     function(parameter);
   }
 
   return NULL;
 }
 
 
 int OSThread::Start(const char* name,
                     ThreadStartFunction function,
@@ skipping 50 matching lines @@
   const int kStackSize = (128 * kWordSize * KB);
   return kStackSize;
 }
 
 
 ThreadId OSThread::GetCurrentThreadId() {
   return pthread_self();
 }
 
 
+#ifndef PRODUCT
 ThreadId OSThread::GetCurrentThreadTraceId() {
-  return syscall(__NR_gettid);
+  UNIMPLEMENTED();
+  return 0;
 }
+#endif  // PRODUCT
 
 
 ThreadJoinId OSThread::GetCurrentThreadJoinId(OSThread* thread) {
   ASSERT(thread != NULL);
   // Make sure we're filling in the join id for the current thread.
   ASSERT(thread->id() == GetCurrentThreadId());
   // Make sure the join_id_ hasn't been set, yet.
   DEBUG_ASSERT(thread->join_id_ == kInvalidThreadJoinId);
   pthread_t id = pthread_self();
 #if defined(DEBUG)
@@ skipping 240 matching lines @@
 
 void Monitor::NotifyAll() {
   // When running with assertions enabled we track the owner.
   ASSERT(IsOwnedByCurrentThread());
   int result = pthread_cond_broadcast(data_.cond());
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_LINUX)
+#endif  // defined(TARGET_OS_FUCHSIA)