Profiler Take 2

runtime/vm/os_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 "vm/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 386 matching lines @@
   return retval;
 }
 
 
 int OS::NumberOfAvailableProcessors() {
   return sysconf(_SC_NPROCESSORS_ONLN);
 }
 
 
 void OS::Sleep(int64_t millis) {
-  // TODO(5411554):  For now just use usleep we may have to revisit this.
-  usleep(millis * 1000);
+  int64_t micros = millis * kMicrosecondsPerMillisecond;
+  SleepMicros(micros);
 }
 
 
+void OS::SleepMicros(int64_t micros) {
+  struct timespec req;  // requested.
+  struct timespec rem;  // remainder.
+  int64_t seconds = micros / kMicrosecondsPerSecond;
+  micros = micros - seconds * kMicrosecondsPerSecond;
+  int64_t nanos = micros * kNanosecondsPerMicrosecond;
+  req.tv_sec = seconds;
+  req.tv_nsec = nanos;
+  while (true) {
+    int r = nanosleep(&req, &rem);
+    if (r == 0) {
+      break;
+    }
+    // We should only ever see an interrupt error.
+    ASSERT(errno == EINTR);
+    // Copy remainder into requested and repeat.
+    req = rem;
+  }
+}
+
+
 void OS::DebugBreak() {
 #if defined(HOST_ARCH_X64) || defined(HOST_ARCH_IA32)
   asm("int $3");
 #elif defined(HOST_ARCH_ARM)
   asm("svc #0x9f0001");  // __ARM_NR_breakpoint
 #elif defined(HOST_ARCH_MIPS)
   UNIMPLEMENTED();
 #else
 #error Unsupported architecture.
 #endif
@@ skipping 102 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)