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Revert "linux: use CLOCK_{REALTIME,MONOTONIC}_COARSE"

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This reverts r17642 (and follow-up fix r17644) for crashing the Chrome sandbox.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/69933005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17668 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jkummerow@chromium.org 2013-11-12 17:10:30 +00:00
parent 102950d7a3
commit cbdd896345
2 changed files with 1 additions and 59 deletions
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58
src/platform/time.cc
View File

@ -43,17 +43,6 @@
#include "win32-headers.h"
#endif
// Make sure CLOCK_{MONOTONIC,REALTIME}_COARSE is defined on Linux.
#if V8_OS_LINUX
# if !defined(CLOCK_REALTIME_COARSE)
# define CLOCK_REALTIME_COARSE 5 // 2.6.32 and up.
# endif
# if !defined(CLOCK_MONOTONIC_COARSE)
# define CLOCK_MONOTONIC_COARSE 6 // 2.6.32 and up.
# endif
#endif // V8_OS_LINUX
namespace v8 {
namespace internal {
@ -282,40 +271,11 @@ FILETIME Time::ToFiletime() const {
#elif V8_OS_POSIX
Time Time::Now() {
#if V8_LIBRT_NOT_AVAILABLE
// TODO(bmeurer): This is a temporary hack to support cross-compiling
// Chrome for Android in AOSP. Remove this once AOSP is fixed, also
// cleanup the tools/gyp/v8.gyp file.
struct timeval tv;
int result = gettimeofday(&tv, NULL);
ASSERT_EQ(0, result);
USE(result);
return FromTimeval(tv);
#elif defined(CLOCK_REALTIME_COARSE)
struct timespec ts;
// Use CLOCK_REALTIME_COARSE if it's available and has a precision of 1ms
// or higher. It's serviced from the vDSO with no system call overhead.
static clock_t clock_id = static_cast<clock_t>(-1);
STATIC_ASSERT(CLOCK_REALTIME != static_cast<clock_t>(-1));
STATIC_ASSERT(CLOCK_REALTIME_COARSE != static_cast<clock_t>(-1));
if (clock_id == static_cast<clock_t>(-1)) {
if (clock_getres(CLOCK_REALTIME_COARSE, &ts) == 0
&& ts.tv_nsec <= kNanosecondsPerMillisecond)
clock_id = CLOCK_REALTIME_COARSE;
else
clock_id = CLOCK_REALTIME;
}
int result = clock_gettime(clock_id, &ts);
ASSERT_EQ(0, result);
USE(result);
return FromTimespec(ts);
#else
struct timeval tv;
int result = gettimeofday(&tv, NULL);
ASSERT_EQ(0, result);
USE(result);
return FromTimeval(tv);
#endif // V8_LIBRT_NOT_AVAILABLE
}
@ -610,23 +570,7 @@ TimeTicks TimeTicks::HighResolutionNow() {
ticks = (tv.tv_sec * Time::kMicrosecondsPerSecond + tv.tv_usec);
#elif V8_OS_POSIX
struct timespec ts;
#if defined(CLOCK_MONOTONIC_COARSE)
// Use CLOCK_MONOTONIC_COARSE if it's available and has a precision of 1ms
// or higher. It's serviced from the vDSO with no system call overhead.
static clock_t clock_id = static_cast<clock_t>(-1);
STATIC_ASSERT(CLOCK_MONOTONIC != static_cast<clock_t>(-1));
STATIC_ASSERT(CLOCK_MONOTONIC_COARSE != static_cast<clock_t>(-1));
if (clock_id == static_cast<clock_t>(-1)) {
if (clock_getres(CLOCK_MONOTONIC_COARSE, &ts) == 0
&& ts.tv_nsec <= Time::kNanosecondsPerMillisecond)
clock_id = CLOCK_MONOTONIC_COARSE;
else
clock_id = CLOCK_MONOTONIC;
}
#else
static const clock_t clock_id = CLOCK_MONOTONIC;
#endif // defined(CLOCK_MONOTONIC_COARSE)
int result = clock_gettime(clock_id, &ts);
int result = clock_gettime(CLOCK_MONOTONIC, &ts);
ASSERT_EQ(0, result);
USE(result);
ticks = (ts.tv_sec * Time::kMicrosecondsPerSecond +

2
src/platform/time.h
View File

@ -192,8 +192,6 @@ class Time V8_FINAL BASE_EMBEDDED {
static const int64_t kMicrosecondsPerDay = kMicrosecondsPerHour * 24;
static const int64_t kMicrosecondsPerWeek = kMicrosecondsPerDay * 7;
static const int64_t kNanosecondsPerMicrosecond = 1000;
static const int64_t kNanosecondsPerMillisecond = kNanosecondsPerMicrosecond *
kMicrosecondsPerMillisecond;
static const int64_t kNanosecondsPerSecond = kNanosecondsPerMicrosecond *
kMicrosecondsPerSecond;