floitsch@google.com
15727ed074
Review URL: https://chromereviews.googleplex.com/3529013 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@107 260f80e4-7a28-3924-810f-c04153c831b5
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_OS_H_
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#define VM_OS_H_
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#include "vm/globals.h"
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namespace dart {
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// Forward declarations.
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class Isolate;
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// Interface to the underlying OS platform.
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class OS {
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public:
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typedef struct BrokenDownDate {
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int year; // Offset by 1900. A value of 111 Represents the year 2011.
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int month; // [0..11]
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int day; // [1..31]
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int hours;
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int minutes;
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int seconds;
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} BrokenDownDate;
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// Takes the seconds since epoch (midnight, January 1, 1970 UTC) and breaks it
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// down into date and time.
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// If 'inUtc', then the broken down date and time are in the UTC timezone,
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// otherwise the local timezone is used.
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// The returned year is offset by 1900. The returned month is 0-based.
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// Returns true if the conversion succeeds, false otherwise.
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static bool BreakDownSecondsSinceEpoch(time_t seconds_since_epoch,
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bool in_utc,
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BrokenDownDate* result);
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// Converts a broken down date into the seconds since epoch (midnight,
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// January 1, 1970 UTC). Returns true if the conversion succeeds, false
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// otherwise.
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static bool BrokenDownToSecondsSinceEpoch(
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const BrokenDownDate& broken_down, bool in_utc, time_t* result);
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// Returns the current time in milliseconds measured
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// from midnight January 1, 1970 UTC.
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static int64_t GetCurrentTimeMillis();
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// Returns the current time in microseconds measured
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// from midnight January 1, 1970 UTC.
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static int64_t GetCurrentTimeMicros();
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// Returns the activation frame alignment constraint or zero if
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// the platform doesn't care. Guaranteed to be a power of two.
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static word ActivationFrameAlignment();
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// Returns the preferred code alignment or zero if
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// the platform doesn't care. Guaranteed to be a power of two.
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static word PreferredCodeAlignment();
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// Returns the stack size limit.
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static uword GetStackSizeLimit();
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// Returns number of available processor cores.
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static int NumberOfAvailableProcessors();
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// Sleep the currently executing thread for millis ms.
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static void Sleep(int64_t millis);
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// Debug break.
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static void DebugBreak();
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// Print formatted output to stdout/stderr for debugging.
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static void Print(const char* format, ...);
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static void PrintErr(const char* format, ...);
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static void VFPrint(FILE* stream, const char* format, va_list args);
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// Print formatted output info a buffer.
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// Does not write more than size characters (including the trailing '\0').
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// Returns the number of characters (excluding the trailing '\0') that would
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// been written if the buffer had been big enough.
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// If the return value is greater or equal than the given size then the output
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// has been truncated.
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// The buffer will always be terminated by a '\0', unless the buffer is of
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// size 0.
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// The buffer might be NULL if the size is 0.
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// This specification conforms to C99 standard which is implemented by
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// glibc 2.1+.
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static int SNPrint(char* str, size_t size, const char* format, ...);
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static int VSNPrint(char* str, size_t size,
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const char* format,
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va_list args);
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// Initialize the OS class.
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static void InitOnce();
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// Shut down the OS class.
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static void Shutdown();
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static void Abort();
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static void Exit(int code);
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};
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} // namespace dart
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#endif // VM_OS_H_
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